Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 4155:394404b2d9bd
Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 21 Dec 2011 11:25:27 +0100 |
parents | d23d2b18183e |
children | 41406797186b |
rev | line source |
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342 | 1 /* |
2152 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 32 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
33 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
34 #include "runtime/arguments.hpp" | |
35 #include "runtime/java.hpp" | |
36 #include "runtime/mutexLocker.hpp" | |
37 #include "utilities/debug.hpp" | |
342 | 38 |
39 // 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 | |
53 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
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()), | |
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139 _using_new_ratio_calculations(false), |
342 | 140 |
677 | 141 _summary(new Summary()), |
342 | 142 |
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143 _cur_clear_ct_time_ms(0.0), |
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144 _mark_closure_time_ms(0.0), |
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145 |
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146 _cur_ref_proc_time_ms(0.0), |
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147 _cur_ref_enq_time_ms(0.0), |
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148 |
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149 #ifndef PRODUCT |
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150 _min_clear_cc_time_ms(-1.0), |
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151 _max_clear_cc_time_ms(-1.0), |
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152 _cur_clear_cc_time_ms(0.0), |
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153 _cum_clear_cc_time_ms(0.0), |
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154 _num_cc_clears(0L), |
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155 #endif |
342 | 156 |
157 _aux_num(10), | |
158 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
159 _cur_aux_start_times_ms(new double[_aux_num]), | |
160 _cur_aux_times_ms(new double[_aux_num]), | |
161 _cur_aux_times_set(new bool[_aux_num]), | |
162 | |
163 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
164 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
165 | |
166 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
167 _prev_collection_pause_end_ms(0.0), | |
168 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
169 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
170 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
171 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
172 _partially_young_cards_per_entry_ratio_seq( | |
173 new TruncatedSeq(TruncatedSeqLength)), | |
174 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
175 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
176 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
177 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
178 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
179 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
180 _non_young_other_cost_per_region_ms_seq( | |
181 new TruncatedSeq(TruncatedSeqLength)), | |
182 | |
183 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
184 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
185 | |
751 | 186 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 187 |
188 _full_young_gcs(true), | |
189 _full_young_pause_num(0), | |
190 _partial_young_pause_num(0), | |
191 | |
192 _during_marking(false), | |
193 _in_marking_window(false), | |
194 _in_marking_window_im(false), | |
195 | |
196 _known_garbage_ratio(0.0), | |
197 _known_garbage_bytes(0), | |
198 | |
199 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
200 | |
201 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
202 | |
203 _recent_avg_pause_time_ratio(0.0), | |
204 | |
205 _all_full_gc_times_ms(new NumberSeq()), | |
206 | |
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207 _initiate_conc_mark_if_possible(false), |
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208 _during_initial_mark_pause(false), |
342 | 209 _should_revert_to_full_young_gcs(false), |
210 _last_full_young_gc(false), | |
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 |
342 | 216 _prev_collection_pause_used_at_end_bytes(0), |
217 | |
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218 _eden_cset_region_length(0), |
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219 _survivor_cset_region_length(0), |
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220 _old_cset_region_length(0), |
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221 |
342 | 222 _collection_set(NULL), |
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223 _collection_set_bytes_used_before(0), |
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224 |
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225 // Incremental CSet attributes |
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226 _inc_cset_build_state(Inactive), |
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227 _inc_cset_head(NULL), |
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228 _inc_cset_tail(NULL), |
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229 _inc_cset_bytes_used_before(0), |
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230 _inc_cset_max_finger(NULL), |
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231 _inc_cset_recorded_rs_lengths(0), |
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232 _inc_cset_predicted_elapsed_time_ms(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]; |
282 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
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]); | |
311 _fully_young_cards_per_entry_ratio_seq->add( | |
312 fully_young_cards_per_entry_ratio_defaults[index]); | |
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(); |
342 | 409 } |
410 | |
411 // Increment "i", mod "len" | |
412 static void inc_mod(int& i, int len) { | |
413 i++; if (i == len) i = 0; | |
414 } | |
415 | |
416 void G1CollectorPolicy::initialize_flags() { | |
417 set_min_alignment(HeapRegion::GrainBytes); | |
418 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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419 if (SurvivorRatio < 1) { |
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420 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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421 } |
342 | 422 CollectorPolicy::initialize_flags(); |
423 } | |
424 | |
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425 // The easiest way to deal with the parsing of the NewSize / |
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426 // MaxNewSize / etc. parameteres is to re-use the code in the |
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427 // TwoGenerationCollectorPolicy class. This is similar to what |
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428 // ParallelScavenge does with its GenerationSizer class (see |
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429 // ParallelScavengeHeap::initialize()). We might change this in the |
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430 // future, but it's a good start. |
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431 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
3976 | 432 private: |
433 size_t size_to_region_num(size_t byte_size) { | |
434 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); | |
435 } | |
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436 |
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437 public: |
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438 G1YoungGenSizer() { |
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439 initialize_flags(); |
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440 initialize_size_info(); |
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441 } |
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442 size_t min_young_region_num() { |
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443 return size_to_region_num(_min_gen0_size); |
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444 } |
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445 size_t initial_young_region_num() { |
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446 return size_to_region_num(_initial_gen0_size); |
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447 } |
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448 size_t max_young_region_num() { |
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449 return size_to_region_num(_max_gen0_size); |
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450 } |
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451 }; |
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452 |
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453 void G1CollectorPolicy::update_young_list_size_using_newratio(size_t number_of_heap_regions) { |
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454 assert(number_of_heap_regions > 0, "Heap must be initialized"); |
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455 size_t young_size = number_of_heap_regions / (NewRatio + 1); |
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456 _min_desired_young_length = young_size; |
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457 _max_desired_young_length = young_size; |
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458 } |
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459 |
342 | 460 void G1CollectorPolicy::init() { |
461 // Set aside an initial future to_space. | |
462 _g1 = G1CollectedHeap::heap(); | |
463 | |
464 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
465 | |
545 | 466 initialize_gc_policy_counters(); |
467 | |
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468 G1YoungGenSizer sizer; |
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469 _min_desired_young_length = sizer.min_young_region_num(); |
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470 _max_desired_young_length = sizer.max_young_region_num(); |
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471 |
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472 if (FLAG_IS_CMDLINE(NewRatio)) { |
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473 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
3976 | 474 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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475 } else { |
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476 // Treat NewRatio as a fixed size that is only recalculated when the heap size changes |
3976 | 477 update_young_list_size_using_newratio(_g1->n_regions()); |
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478 _using_new_ratio_calculations = true; |
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479 } |
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480 } |
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481 |
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482 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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483 |
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484 set_adaptive_young_list_length(_min_desired_young_length < _max_desired_young_length); |
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485 if (adaptive_young_list_length()) { |
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486 _young_list_fixed_length = 0; |
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487 } else { |
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488 assert(_min_desired_young_length == _max_desired_young_length, "Min and max young size differ"); |
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489 _young_list_fixed_length = _min_desired_young_length; |
342 | 490 } |
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491 _free_regions_at_end_of_collection = _g1->free_regions(); |
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492 update_young_list_target_length(); |
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493 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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494 |
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495 // We may immediately start allocating regions and placing them on the |
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496 // collection set list. Initialize the per-collection set info |
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497 start_incremental_cset_building(); |
342 | 498 } |
499 | |
545 | 500 // Create the jstat counters for the policy. |
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501 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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502 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 503 } |
504 | |
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505 bool G1CollectorPolicy::predict_will_fit(size_t young_length, |
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506 double base_time_ms, |
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507 size_t base_free_regions, |
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508 double target_pause_time_ms) { |
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509 if (young_length >= base_free_regions) { |
342 | 510 // end condition 1: not enough space for the young regions |
511 return false; | |
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512 } |
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513 |
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514 double accum_surv_rate = accum_yg_surv_rate_pred((int)(young_length - 1)); |
342 | 515 size_t bytes_to_copy = |
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516 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 517 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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518 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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519 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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520 if (pause_time_ms > target_pause_time_ms) { |
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521 // end condition 2: prediction is over the target pause time |
342 | 522 return false; |
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523 } |
342 | 524 |
525 size_t free_bytes = | |
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526 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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527 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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528 // end condition 3: out-of-space (conservatively!) |
342 | 529 return false; |
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530 } |
342 | 531 |
532 // success! | |
533 return true; | |
534 } | |
535 | |
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536 void G1CollectorPolicy::record_new_heap_size(size_t new_number_of_regions) { |
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537 // re-calculate the necessary reserve |
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538 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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539 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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540 // smaller than 1.0) we'll get 1. |
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541 _reserve_regions = (size_t) ceil(reserve_regions_d); |
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542 |
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543 if (_using_new_ratio_calculations) { |
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544 // -XX:NewRatio was specified so we need to update the |
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545 // young gen length when the heap size has changed. |
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546 update_young_list_size_using_newratio(new_number_of_regions); |
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547 } |
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548 } |
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549 |
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550 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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551 size_t base_min_length) { |
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552 size_t desired_min_length = 0; |
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553 if (adaptive_young_list_length()) { |
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554 if (_alloc_rate_ms_seq->num() > 3) { |
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555 double now_sec = os::elapsedTime(); |
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556 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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557 double alloc_rate_ms = predict_alloc_rate_ms(); |
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558 desired_min_length = (size_t) ceil(alloc_rate_ms * when_ms); |
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559 } else { |
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560 // otherwise we don't have enough info to make the prediction |
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561 } |
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562 } |
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563 desired_min_length += base_min_length; |
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564 // make sure we don't go below any user-defined minimum bound |
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565 return MAX2(_min_desired_young_length, desired_min_length); |
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566 } |
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567 |
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568 size_t G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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569 // Here, we might want to also take into account any additional |
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570 // constraints (i.e., user-defined minimum bound). Currently, we |
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571 // effectively don't set this bound. |
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572 return _max_desired_young_length; |
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573 } |
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574 |
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575 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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576 if (rs_lengths == (size_t) -1) { |
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577 // if it's set to the default value (-1), we should predict it; |
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578 // otherwise, use the given value. |
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579 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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580 } |
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581 |
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582 // Calculate the absolute and desired min bounds. |
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583 |
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584 // This is how many young regions we already have (currently: the survivors). |
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585 size_t base_min_length = recorded_survivor_regions(); |
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586 // This is the absolute minimum young length, which ensures that we |
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587 // can allocate one eden region in the worst-case. |
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588 size_t absolute_min_length = base_min_length + 1; |
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589 size_t desired_min_length = |
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590 calculate_young_list_desired_min_length(base_min_length); |
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591 if (desired_min_length < absolute_min_length) { |
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592 desired_min_length = absolute_min_length; |
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593 } |
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594 |
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595 // Calculate the absolute and desired max bounds. |
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596 |
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597 // We will try our best not to "eat" into the reserve. |
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598 size_t absolute_max_length = 0; |
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599 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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600 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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601 } |
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602 size_t desired_max_length = calculate_young_list_desired_max_length(); |
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603 if (desired_max_length > absolute_max_length) { |
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604 desired_max_length = absolute_max_length; |
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605 } |
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606 |
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607 size_t young_list_target_length = 0; |
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608 if (adaptive_young_list_length()) { |
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609 if (full_young_gcs()) { |
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610 young_list_target_length = |
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611 calculate_young_list_target_length(rs_lengths, |
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612 base_min_length, |
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613 desired_min_length, |
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614 desired_max_length); |
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615 _rs_lengths_prediction = rs_lengths; |
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616 } else { |
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617 // Don't calculate anything and let the code below bound it to |
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618 // the desired_min_length, i.e., do the next GC as soon as |
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619 // possible to maximize how many old regions we can add to it. |
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620 } |
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621 } else { |
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622 if (full_young_gcs()) { |
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623 young_list_target_length = _young_list_fixed_length; |
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624 } else { |
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625 // A bit arbitrary: during partially-young GCs we allocate half |
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626 // the young regions to try to add old regions to the CSet. |
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627 young_list_target_length = _young_list_fixed_length / 2; |
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628 // We choose to accept that we might go under the desired min |
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629 // length given that we intentionally ask for a smaller young gen. |
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630 desired_min_length = absolute_min_length; |
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631 } |
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632 } |
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633 |
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634 // Make sure we don't go over the desired max length, nor under the |
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635 // desired min length. In case they clash, desired_min_length wins |
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636 // which is why that test is second. |
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637 if (young_list_target_length > desired_max_length) { |
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638 young_list_target_length = desired_max_length; |
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639 } |
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640 if (young_list_target_length < desired_min_length) { |
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641 young_list_target_length = desired_min_length; |
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642 } |
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643 |
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644 assert(young_list_target_length > recorded_survivor_regions(), |
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645 "we should be able to allocate at least one eden region"); |
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646 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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647 _young_list_target_length = young_list_target_length; |
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648 |
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649 update_max_gc_locker_expansion(); |
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650 } |
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651 |
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652 size_t |
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653 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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654 size_t base_min_length, |
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655 size_t desired_min_length, |
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656 size_t desired_max_length) { |
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657 assert(adaptive_young_list_length(), "pre-condition"); |
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658 assert(full_young_gcs(), "only call this for fully-young GCs"); |
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659 |
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660 // In case some edge-condition makes the desired max length too small... |
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661 if (desired_max_length <= desired_min_length) { |
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662 return desired_min_length; |
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663 } |
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664 |
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665 // We'll adjust min_young_length and max_young_length not to include |
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666 // the already allocated young regions (i.e., so they reflect the |
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667 // min and max eden regions we'll allocate). The base_min_length |
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668 // will be reflected in the predictions by the |
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669 // survivor_regions_evac_time prediction. |
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670 assert(desired_min_length > base_min_length, "invariant"); |
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671 size_t min_young_length = desired_min_length - base_min_length; |
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672 assert(desired_max_length > base_min_length, "invariant"); |
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673 size_t max_young_length = desired_max_length - base_min_length; |
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674 |
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675 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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676 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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677 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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678 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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679 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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680 double base_time_ms = |
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681 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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682 survivor_regions_evac_time; |
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683 size_t available_free_regions = _free_regions_at_end_of_collection; |
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684 size_t base_free_regions = 0; |
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685 if (available_free_regions > _reserve_regions) { |
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686 base_free_regions = available_free_regions - _reserve_regions; |
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687 } |
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688 |
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689 // Here, we will make sure that the shortest young length that |
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690 // makes sense fits within the target pause time. |
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691 |
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692 if (predict_will_fit(min_young_length, base_time_ms, |
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693 base_free_regions, target_pause_time_ms)) { |
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694 // The shortest young length will fit into the target pause time; |
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695 // we'll now check whether the absolute maximum number of young |
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696 // regions will fit in the target pause time. If not, we'll do |
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697 // a binary search between min_young_length and max_young_length. |
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698 if (predict_will_fit(max_young_length, base_time_ms, |
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699 base_free_regions, target_pause_time_ms)) { |
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700 // The maximum young length will fit into the target pause time. |
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701 // We are done so set min young length to the maximum length (as |
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702 // the result is assumed to be returned in min_young_length). |
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703 min_young_length = max_young_length; |
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704 } else { |
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705 // The maximum possible number of young regions will not fit within |
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706 // the target pause time so we'll search for the optimal |
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707 // length. The loop invariants are: |
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708 // |
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709 // min_young_length < max_young_length |
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710 // min_young_length is known to fit into the target pause time |
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711 // max_young_length is known not to fit into the target pause time |
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712 // |
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713 // Going into the loop we know the above hold as we've just |
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714 // checked them. Every time around the loop we check whether |
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715 // the middle value between min_young_length and |
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716 // max_young_length fits into the target pause time. If it |
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717 // does, it becomes the new min. If it doesn't, it becomes |
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718 // the new max. This way we maintain the loop invariants. |
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719 |
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720 assert(min_young_length < max_young_length, "invariant"); |
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721 size_t diff = (max_young_length - min_young_length) / 2; |
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722 while (diff > 0) { |
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723 size_t young_length = min_young_length + diff; |
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724 if (predict_will_fit(young_length, base_time_ms, |
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725 base_free_regions, target_pause_time_ms)) { |
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726 min_young_length = young_length; |
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727 } else { |
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728 max_young_length = young_length; |
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729 } |
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730 assert(min_young_length < max_young_length, "invariant"); |
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731 diff = (max_young_length - min_young_length) / 2; |
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732 } |
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733 // The results is min_young_length which, according to the |
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734 // loop invariants, should fit within the target pause time. |
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735 |
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736 // These are the post-conditions of the binary search above: |
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737 assert(min_young_length < max_young_length, |
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738 "otherwise we should have discovered that max_young_length " |
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739 "fits into the pause target and not done the binary search"); |
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740 assert(predict_will_fit(min_young_length, base_time_ms, |
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741 base_free_regions, target_pause_time_ms), |
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742 "min_young_length, the result of the binary search, should " |
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743 "fit into the pause target"); |
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744 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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745 base_free_regions, target_pause_time_ms), |
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746 "min_young_length, the result of the binary search, should be " |
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747 "optimal, so no larger length should fit into the pause target"); |
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748 } |
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749 } else { |
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750 // Even the minimum length doesn't fit into the pause time |
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751 // target, return it as the result nevertheless. |
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752 } |
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753 return base_min_length + min_young_length; |
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754 } |
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755 |
545 | 756 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
757 double survivor_regions_evac_time = 0.0; | |
758 for (HeapRegion * r = _recorded_survivor_head; | |
759 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
760 r = r->get_next_young_region()) { | |
761 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
762 } | |
763 return survivor_regions_evac_time; | |
764 } | |
765 | |
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766 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 767 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
768 | |
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769 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 770 if (rs_lengths > _rs_lengths_prediction) { |
771 // add 10% to avoid having to recalculate often | |
772 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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773 update_young_list_target_length(rs_lengths_prediction); |
342 | 774 } |
775 } | |
776 | |
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777 |
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778 |
342 | 779 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
780 bool is_tlab, | |
781 bool* gc_overhead_limit_was_exceeded) { | |
782 guarantee(false, "Not using this policy feature yet."); | |
783 return NULL; | |
784 } | |
785 | |
786 // This method controls how a collector handles one or more | |
787 // of its generations being fully allocated. | |
788 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
789 bool is_tlab) { | |
790 guarantee(false, "Not using this policy feature yet."); | |
791 return NULL; | |
792 } | |
793 | |
794 | |
795 #ifndef PRODUCT | |
796 bool G1CollectorPolicy::verify_young_ages() { | |
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797 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 798 return |
799 verify_young_ages(head, _short_lived_surv_rate_group); | |
800 // also call verify_young_ages on any additional surv rate groups | |
801 } | |
802 | |
803 bool | |
804 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
805 SurvRateGroup *surv_rate_group) { | |
806 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
807 | |
808 const char* name = surv_rate_group->name(); | |
809 bool ret = true; | |
810 int prev_age = -1; | |
811 | |
812 for (HeapRegion* curr = head; | |
813 curr != NULL; | |
814 curr = curr->get_next_young_region()) { | |
815 SurvRateGroup* group = curr->surv_rate_group(); | |
816 if (group == NULL && !curr->is_survivor()) { | |
817 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
818 ret = false; | |
819 } | |
820 | |
821 if (surv_rate_group == group) { | |
822 int age = curr->age_in_surv_rate_group(); | |
823 | |
824 if (age < 0) { | |
825 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
826 ret = false; | |
827 } | |
828 | |
829 if (age <= prev_age) { | |
830 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
831 "(%d, %d)", name, age, prev_age); | |
832 ret = false; | |
833 } | |
834 prev_age = age; | |
835 } | |
836 } | |
837 | |
838 return ret; | |
839 } | |
840 #endif // PRODUCT | |
841 | |
842 void G1CollectorPolicy::record_full_collection_start() { | |
843 _cur_collection_start_sec = os::elapsedTime(); | |
844 // Release the future to-space so that it is available for compaction into. | |
845 _g1->set_full_collection(); | |
846 } | |
847 | |
848 void G1CollectorPolicy::record_full_collection_end() { | |
849 // Consider this like a collection pause for the purposes of allocation | |
850 // since last pause. | |
851 double end_sec = os::elapsedTime(); | |
852 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
853 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
854 | |
855 _all_full_gc_times_ms->add(full_gc_time_ms); | |
856 | |
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857 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 858 |
859 _g1->clear_full_collection(); | |
860 | |
861 // "Nuke" the heuristics that control the fully/partially young GC | |
862 // transitions and make sure we start with fully young GCs after the | |
863 // Full GC. | |
864 set_full_young_gcs(true); | |
865 _last_full_young_gc = false; | |
866 _should_revert_to_full_young_gcs = false; | |
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867 clear_initiate_conc_mark_if_possible(); |
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868 clear_during_initial_mark_pause(); |
342 | 869 _known_garbage_bytes = 0; |
870 _known_garbage_ratio = 0.0; | |
871 _in_marking_window = false; | |
872 _in_marking_window_im = false; | |
873 | |
874 _short_lived_surv_rate_group->start_adding_regions(); | |
875 // also call this on any additional surv rate groups | |
876 | |
545 | 877 record_survivor_regions(0, NULL, NULL); |
878 | |
342 | 879 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 880 // Reset survivors SurvRateGroup. |
881 _survivor_surv_rate_group->reset(); | |
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882 update_young_list_target_length(); |
4013 | 883 _collectionSetChooser->updateAfterFullCollection(); |
1973 | 884 } |
342 | 885 |
886 void G1CollectorPolicy::record_stop_world_start() { | |
887 _stop_world_start = os::elapsedTime(); | |
888 } | |
889 | |
890 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
891 size_t start_used) { | |
892 if (PrintGCDetails) { | |
893 gclog_or_tty->stamp(PrintGCTimeStamps); | |
894 gclog_or_tty->print("[GC pause"); | |
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895 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
342 | 896 } |
897 | |
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898 // We only need to do this here as the policy will only be applied |
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899 // to the GC we're about to start. so, no point is calculating this |
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900 // every time we calculate / recalculate the target young length. |
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901 update_survivors_policy(); |
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902 |
1973 | 903 assert(_g1->used() == _g1->recalculate_used(), |
904 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
905 _g1->used(), _g1->recalculate_used())); | |
342 | 906 |
907 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
908 _all_stop_world_times_ms->add(s_w_t_ms); | |
909 _stop_world_start = 0.0; | |
910 | |
911 _cur_collection_start_sec = start_time_sec; | |
912 _cur_collection_pause_used_at_start_bytes = start_used; | |
913 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
914 _pending_cards = _g1->pending_card_num(); | |
915 _max_pending_cards = _g1->max_pending_card_num(); | |
916 | |
917 _bytes_in_collection_set_before_gc = 0; | |
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918 _bytes_copied_during_gc = 0; |
342 | 919 |
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920 YoungList* young_list = _g1->young_list(); |
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921 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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922 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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923 _capacity_before_gc = _g1->capacity(); |
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924 |
342 | 925 #ifdef DEBUG |
926 // initialise these to something well known so that we can spot | |
927 // if they are not set properly | |
928 | |
929 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 930 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
931 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
932 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
933 _par_last_update_rs_times_ms[i] = -1234.0; | |
934 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
935 _par_last_scan_rs_times_ms[i] = -1234.0; | |
936 _par_last_obj_copy_times_ms[i] = -1234.0; | |
937 _par_last_termination_times_ms[i] = -1234.0; | |
938 _par_last_termination_attempts[i] = -1234.0; | |
939 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 940 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 941 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 942 } |
943 #endif | |
944 | |
945 for (int i = 0; i < _aux_num; ++i) { | |
946 _cur_aux_times_ms[i] = 0.0; | |
947 _cur_aux_times_set[i] = false; | |
948 } | |
949 | |
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950 // This is initialized to zero here and is set during |
4023 | 951 // the evacuation pause if marking is in progress. |
952 _cur_satb_drain_time_ms = 0.0; | |
342 | 953 |
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954 _last_young_gc_full = false; |
342 | 955 |
956 // do that for any other surv rate groups | |
957 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 958 _survivors_age_table.clear(); |
545 | 959 |
342 | 960 assert( verify_young_ages(), "region age verification" ); |
961 } | |
962 | |
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963 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 964 mark_init_elapsed_time_ms) { |
965 _during_marking = true; | |
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966 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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967 clear_during_initial_mark_pause(); |
342 | 968 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
969 } | |
970 | |
971 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
972 _mark_remark_start_sec = os::elapsedTime(); | |
973 _during_marking = false; | |
974 } | |
975 | |
976 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
977 double end_time_sec = os::elapsedTime(); | |
978 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
979 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
980 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
981 _prev_collection_pause_end_ms += elapsed_time_ms; | |
982 | |
983 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
984 } | |
985 | |
986 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
987 _mark_cleanup_start_sec = os::elapsedTime(); | |
988 } | |
989 | |
4013 | 990 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
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991 _should_revert_to_full_young_gcs = false; |
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992 _last_full_young_gc = true; |
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993 _in_marking_window = false; |
342 | 994 } |
995 | |
996 void G1CollectorPolicy::record_concurrent_pause() { | |
997 if (_stop_world_start > 0.0) { | |
998 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
999 _all_yield_times_ms->add(yield_ms); | |
1000 } | |
1001 } | |
1002 | |
1003 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1004 } | |
1005 | |
1006 template<class T> | |
1007 T sum_of(T* sum_arr, int start, int n, int N) { | |
1008 T sum = (T)0; | |
1009 for (int i = 0; i < n; i++) { | |
1010 int j = (start + i) % N; | |
1011 sum += sum_arr[j]; | |
1012 } | |
1013 return sum; | |
1014 } | |
1015 | |
1611 | 1016 void G1CollectorPolicy::print_par_stats(int level, |
1017 const char* str, | |
2430 | 1018 double* data) { |
342 | 1019 double min = data[0], max = data[0]; |
1020 double total = 0.0; | |
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1021 LineBuffer buf(level); |
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1022 buf.append("[%s (ms):", str); |
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1023 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1024 double val = data[i]; |
1025 if (val < min) | |
1026 min = val; | |
1027 if (val > max) | |
1028 max = val; | |
1029 total += val; | |
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1030 buf.append(" %3.1lf", val); |
342 | 1031 } |
2430 | 1032 buf.append_and_print_cr(""); |
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1033 double avg = total / (double) no_of_gc_threads(); |
2430 | 1034 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", |
1035 avg, min, max, max - min); | |
342 | 1036 } |
1037 | |
1611 | 1038 void G1CollectorPolicy::print_par_sizes(int level, |
1039 const char* str, | |
2430 | 1040 double* data) { |
342 | 1041 double min = data[0], max = data[0]; |
1042 double total = 0.0; | |
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1043 LineBuffer buf(level); |
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1044 buf.append("[%s :", str); |
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1045 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1046 double val = data[i]; |
1047 if (val < min) | |
1048 min = val; | |
1049 if (val > max) | |
1050 max = val; | |
1051 total += val; | |
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1052 buf.append(" %d", (int) val); |
342 | 1053 } |
2430 | 1054 buf.append_and_print_cr(""); |
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1055 double avg = total / (double) no_of_gc_threads(); |
2430 | 1056 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", |
1057 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1058 } |
1059 | |
4023 | 1060 void G1CollectorPolicy::print_stats(int level, |
1061 const char* str, | |
1062 double value) { | |
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1063 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1064 } |
1065 | |
4023 | 1066 void G1CollectorPolicy::print_stats(int level, |
1067 const char* str, | |
1068 int value) { | |
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1069 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1070 } |
1071 | |
4023 | 1072 double G1CollectorPolicy::avg_value(double* data) { |
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1073 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1074 double ret = 0.0; |
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1075 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1076 ret += data[i]; |
4023 | 1077 } |
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1078 return ret / (double) no_of_gc_threads(); |
342 | 1079 } else { |
1080 return data[0]; | |
1081 } | |
1082 } | |
1083 | |
4023 | 1084 double G1CollectorPolicy::max_value(double* data) { |
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1085 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1086 double ret = data[0]; |
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1087 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
4023 | 1088 if (data[i] > ret) { |
342 | 1089 ret = data[i]; |
4023 | 1090 } |
1091 } | |
342 | 1092 return ret; |
1093 } else { | |
1094 return data[0]; | |
1095 } | |
1096 } | |
1097 | |
4023 | 1098 double G1CollectorPolicy::sum_of_values(double* data) { |
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1099 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1100 double sum = 0.0; |
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1101 for (uint i = 0; i < no_of_gc_threads(); i++) { |
342 | 1102 sum += data[i]; |
4023 | 1103 } |
342 | 1104 return sum; |
1105 } else { | |
1106 return data[0]; | |
1107 } | |
1108 } | |
1109 | |
4023 | 1110 double G1CollectorPolicy::max_sum(double* data1, double* data2) { |
342 | 1111 double ret = data1[0] + data2[0]; |
1112 | |
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1113 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1114 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
342 | 1115 double data = data1[i] + data2[i]; |
4023 | 1116 if (data > ret) { |
342 | 1117 ret = data; |
4023 | 1118 } |
342 | 1119 } |
1120 } | |
1121 return ret; | |
1122 } | |
1123 | |
1124 // Anything below that is considered to be zero | |
1125 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1126 | |
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1127 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1128 double end_time_sec = os::elapsedTime(); |
1129 double elapsed_ms = _last_pause_time_ms; | |
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1130 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
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1131 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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1132 "otherwise, the subtraction below does not make sense"); |
342 | 1133 size_t rs_size = |
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1134 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1135 size_t cur_used_bytes = _g1->used(); |
1136 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1137 bool last_pause_included_initial_mark = false; | |
1707 | 1138 bool update_stats = !_g1->evacuation_failed(); |
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1139 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1140 |
1141 #ifndef PRODUCT | |
1142 if (G1YoungSurvRateVerbose) { | |
1143 gclog_or_tty->print_cr(""); | |
1144 _short_lived_surv_rate_group->print(); | |
1145 // do that for any other surv rate groups too | |
1146 } | |
1147 #endif // PRODUCT | |
1148 | |
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1149 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1150 if (last_pause_included_initial_mark) |
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1151 record_concurrent_mark_init_end(0.0); |
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1152 |
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1153 size_t marking_initiating_used_threshold = |
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1154 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1155 |
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1156 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1157 assert(!last_pause_included_initial_mark, "invariant"); |
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1158 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1159 if (cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1160 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1161 |
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1162 ergo_verbose3(ErgoConcCycles, |
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1163 "request concurrent cycle initiation", |
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1164 ergo_format_reason("occupancy higher than threshold") |
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1165 ergo_format_byte("occupancy") |
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1166 ergo_format_byte_perc("threshold"), |
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1167 cur_used_bytes, |
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1168 marking_initiating_used_threshold, |
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1169 (double) InitiatingHeapOccupancyPercent); |
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1170 |
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1171 // Note: this might have already been set, if during the last |
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1172 // pause we decided to start a cycle but at the beginning of |
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1173 // this pause we decided to postpone it. That's OK. |
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1174 set_initiate_conc_mark_if_possible(); |
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1175 } else { |
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1176 ergo_verbose2(ErgoConcCycles, |
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1177 "do not request concurrent cycle initiation", |
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1178 ergo_format_reason("occupancy lower than previous occupancy") |
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1179 ergo_format_byte("occupancy") |
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1180 ergo_format_byte("previous occupancy"), |
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1181 cur_used_bytes, |
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1182 _prev_collection_pause_used_at_end_bytes); |
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1183 } |
342 | 1184 } |
1185 } | |
1186 | |
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1187 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1188 |
342 | 1189 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1190 end_time_sec, false); | |
1191 | |
1192 // This assert is exempted when we're doing parallel collection pauses, | |
1193 // because the fragmentation caused by the parallel GC allocation buffers | |
1194 // can lead to more memory being used during collection than was used | |
1195 // before. Best leave this out until the fragmentation problem is fixed. | |
1196 // Pauses in which evacuation failed can also lead to negative | |
1197 // collections, since no space is reclaimed from a region containing an | |
1198 // object whose evacuation failed. | |
1199 // Further, we're now always doing parallel collection. But I'm still | |
1200 // leaving this here as a placeholder for a more precise assertion later. | |
1201 // (DLD, 10/05.) | |
1202 assert((true || parallel) // Always using GC LABs now. | |
1203 || _g1->evacuation_failed() | |
1204 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1205 "Negative collection"); | |
1206 | |
1207 size_t freed_bytes = | |
1208 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1209 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
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1210 |
342 | 1211 double survival_fraction = |
1212 (double)surviving_bytes/ | |
1213 (double)_collection_set_bytes_used_before; | |
1214 | |
4023 | 1215 // These values are used to update the summary information that is |
1216 // displayed when TraceGen0Time is enabled, and are output as part | |
1217 // of the PrintGCDetails output, in the non-parallel case. | |
1218 | |
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1219 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1220 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1221 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1222 double update_rs_processed_buffers = |
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1223 sum_of_values(_par_last_update_rs_processed_buffers); |
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1224 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1225 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1226 double termination_time = avg_value(_par_last_termination_times_ms); |
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1227 |
4023 | 1228 double known_time = ext_root_scan_time + |
1229 mark_stack_scan_time + | |
1230 update_rs_time + | |
1231 scan_rs_time + | |
1232 obj_copy_time; | |
1233 | |
1234 double other_time_ms = elapsed_ms; | |
1235 | |
1236 // Subtract the SATB drain time. It's initialized to zero at the | |
1237 // start of the pause and is updated during the pause if marking | |
1238 // is in progress. | |
1239 other_time_ms -= _cur_satb_drain_time_ms; | |
1240 | |
1241 if (parallel) { | |
1242 other_time_ms -= _cur_collection_par_time_ms; | |
1243 } else { | |
1244 other_time_ms -= known_time; | |
1245 } | |
1246 | |
1247 // Subtract the time taken to clean the card table from the | |
1248 // current value of "other time" | |
1249 other_time_ms -= _cur_clear_ct_time_ms; | |
1250 | |
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1251 // Subtract the time spent completing marking in the collection |
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1252 // set. Note if marking is not in progress during the pause |
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1253 // the value of _mark_closure_time_ms will be zero. |
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1254 other_time_ms -= _mark_closure_time_ms; |
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1255 |
4023 | 1256 // TraceGen0Time and TraceGen1Time summary info updating. |
1257 _all_pause_times_ms->add(elapsed_ms); | |
3823
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1258 |
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1259 if (update_stats) { |
4023 | 1260 _summary->record_total_time_ms(elapsed_ms); |
1261 _summary->record_other_time_ms(other_time_ms); | |
1262 | |
1263 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1264 assert(body_summary != NULL, "should not be null!"); | |
1265 | |
1266 // This will be non-zero iff marking is currently in progress (i.e. | |
1267 // _g1->mark_in_progress() == true) and the currrent pause was not | |
1268 // an initial mark pause. Since the body_summary items are NumberSeqs, | |
1269 // however, they have to be consistent and updated in lock-step with | |
1270 // each other. Therefore we unconditionally record the SATB drain | |
1271 // time - even if it's zero. | |
1272 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
3823
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1273 |
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1274 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1275 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1276 body_summary->record_update_rs_time_ms(update_rs_time); |
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1277 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1278 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1279 |
3823
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1280 if (parallel) { |
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1281 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1282 body_summary->record_termination_time_ms(termination_time); |
4023 | 1283 |
1284 double parallel_known_time = known_time + termination_time; | |
1285 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
3823
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1286 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1287 } |
4023 | 1288 |
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1289 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
4023 | 1290 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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1291 |
342 | 1292 // We exempt parallel collection from this check because Alloc Buffer |
1293 // fragmentation can produce negative collections. Same with evac | |
1294 // failure. | |
1295 // Further, we're now always doing parallel collection. But I'm still | |
1296 // leaving this here as a placeholder for a more precise assertion later. | |
1297 // (DLD, 10/05. | |
1298 assert((true || parallel) | |
1299 || _g1->evacuation_failed() | |
1300 || surviving_bytes <= _collection_set_bytes_used_before, | |
1301 "Or else negative collection!"); | |
4023 | 1302 |
342 | 1303 // this is where we update the allocation rate of the application |
1304 double app_time_ms = | |
1305 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1306 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1307 // This usually happens due to the timer not having the required | |
1308 // granularity. Some Linuxes are the usual culprits. | |
1309 // We'll just set it to something (arbitrarily) small. | |
1310 app_time_ms = 1.0; | |
1311 } | |
4090
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1312 // We maintain the invariant that all objects allocated by mutator |
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1313 // threads will be allocated out of eden regions. So, we can use |
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1314 // the eden region number allocated since the previous GC to |
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1315 // calculate the application's allocate rate. The only exception |
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1316 // to that is humongous objects that are allocated separately. But |
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1317 // given that humongous object allocations do not really affect |
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1318 // either the pause's duration nor when the next pause will take |
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1319 // place we can safely ignore them here. |
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1320 size_t regions_allocated = eden_cset_region_length(); |
342 | 1321 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
1322 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1323 | |
1324 double interval_ms = | |
1325 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1326 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1327 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1328 if (recent_avg_pause_time_ratio() < 0.0 || |
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1329 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1330 #ifndef PRODUCT |
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1331 // Dump info to allow post-facto debugging |
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1332 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1333 gclog_or_tty->print_cr("-------------------------------------------"); |
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1334 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1335 _recent_gc_times_ms->dump(); |
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1336 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1337 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1338 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1339 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1340 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1341 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1342 #endif // !PRODUCT |
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1343 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1344 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1345 if (_recent_avg_pause_time_ratio < 0.0) { |
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1346 _recent_avg_pause_time_ratio = 0.0; |
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1347 } else { |
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1348 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1349 _recent_avg_pause_time_ratio = 1.0; |
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1350 } |
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1351 } |
342 | 1352 } |
1353 | |
4023 | 1354 for (int i = 0; i < _aux_num; ++i) { |
1355 if (_cur_aux_times_set[i]) { | |
1356 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1357 } | |
1358 } | |
1359 | |
1360 // PrintGCDetails output | |
342 | 1361 if (PrintGCDetails) { |
4023 | 1362 bool print_marking_info = |
1363 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1364 | |
1707 | 1365 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1366 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1367 elapsed_ms / 1000.0); | |
1368 | |
4023 | 1369 if (print_marking_info) { |
1707 | 1370 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
1371 } | |
4023 | 1372 |
1707 | 1373 if (parallel) { |
1374 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1375 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1376 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1377 if (print_marking_info) { | |
1378 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1379 } | |
1707 | 1380 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1381 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1707 | 1382 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1383 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1384 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1385 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
4023 | 1386 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
2430 | 1387 |
1388 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1389 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
4023 | 1390 |
1391 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
1392 _par_last_mark_stack_scan_times_ms[i] + | |
1393 _par_last_update_rs_times_ms[i] + | |
1394 _par_last_scan_rs_times_ms[i] + | |
1395 _par_last_obj_copy_times_ms[i] + | |
1396 _par_last_termination_times_ms[i]; | |
1397 | |
1398 _par_last_gc_worker_other_times_ms[i] = _cur_collection_par_time_ms - worker_known_time; | |
2430 | 1399 } |
4023 | 1400 print_par_stats(2, "GC Worker", _par_last_gc_worker_times_ms); |
1401 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); | |
1707 | 1402 } else { |
4023 | 1403 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1404 if (print_marking_info) { | |
1405 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1406 } | |
1707 | 1407 print_stats(1, "Update RS", update_rs_time); |
4023 | 1408 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
1707 | 1409 print_stats(1, "Scan RS", scan_rs_time); |
1410 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1411 } |
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1412 if (print_marking_info) { |
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1413 print_stats(1, "Complete CSet Marking", _mark_closure_time_ms); |
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1414 } |
4023 | 1415 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
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1416 #ifndef PRODUCT |
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1417 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1418 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1419 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1420 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1421 if (_num_cc_clears > 0) { |
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1422 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1423 } |
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1424 #endif |
342 | 1425 print_stats(1, "Other", other_time_ms); |
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1426 print_stats(2, "Choose CSet", |
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1427 (_recorded_young_cset_choice_time_ms + |
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1428 _recorded_non_young_cset_choice_time_ms)); |
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1429 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1430 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1431 print_stats(2, "Free CSet", |
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1432 (_recorded_young_free_cset_time_ms + |
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1433 _recorded_non_young_free_cset_time_ms)); |
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1434 |
342 | 1435 for (int i = 0; i < _aux_num; ++i) { |
1436 if (_cur_aux_times_set[i]) { | |
1437 char buffer[96]; | |
1438 sprintf(buffer, "Aux%d", i); | |
1439 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1440 } | |
1441 } | |
1442 } | |
1443 | |
1444 // Update the efficiency-since-mark vars. | |
1445 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1446 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1447 // This usually happens due to the timer not having the required | |
1448 // granularity. Some Linuxes are the usual culprits. | |
1449 // We'll just set it to something (arbitrarily) small. | |
1450 proc_ms = 1.0; | |
1451 } | |
1452 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1453 | |
1454 bool new_in_marking_window = _in_marking_window; | |
1455 bool new_in_marking_window_im = false; | |
1359
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1456 if (during_initial_mark_pause()) { |
342 | 1457 new_in_marking_window = true; |
1458 new_in_marking_window_im = true; | |
1459 } | |
1460 | |
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1461 if (_last_full_young_gc) { |
3982
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1462 if (!last_pause_included_initial_mark) { |
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1463 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1464 "start partially-young GCs", |
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1465 ergo_format_byte_perc("known garbage"), |
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1466 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1467 set_full_young_gcs(false); |
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1468 } else { |
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1469 ergo_verbose0(ErgoPartiallyYoungGCs, |
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1470 "do not start partially-young GCs", |
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1471 ergo_format_reason("concurrent cycle is about to start")); |
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1472 } |
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1473 _last_full_young_gc = false; |
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1474 } |
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1475 |
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1476 if ( !_last_young_gc_full ) { |
3914
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1477 if (_should_revert_to_full_young_gcs) { |
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1478 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1479 "end partially-young GCs", |
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1480 ergo_format_reason("partially-young GCs end requested") |
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1481 ergo_format_byte_perc("known garbage"), |
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1482 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1483 set_full_young_gcs(true); |
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1484 } else if (_known_garbage_ratio < 0.05) { |
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1485 ergo_verbose3(ErgoPartiallyYoungGCs, |
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|
1486 "end partially-young GCs", |
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1487 ergo_format_reason("known garbage percent lower than threshold") |
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1488 ergo_format_byte_perc("known garbage") |
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|
1489 ergo_format_perc("threshold"), |
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1490 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
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1491 0.05 * 100.0); |
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1492 set_full_young_gcs(true); |
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1493 } else if (adaptive_young_list_length() && |
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1494 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
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1495 ergo_verbose5(ErgoPartiallyYoungGCs, |
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1496 "end partially-young GCs", |
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1497 ergo_format_reason("current GC efficiency lower than " |
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1498 "predicted fully-young GC efficiency") |
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1499 ergo_format_double("GC efficiency factor") |
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1500 ergo_format_double("current GC efficiency") |
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1501 ergo_format_double("predicted fully-young GC efficiency") |
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1502 ergo_format_byte_perc("known garbage"), |
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|
1503 get_gc_eff_factor(), cur_efficiency, |
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|
1504 predict_young_gc_eff(), |
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1505 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1506 set_full_young_gcs(true); |
342 | 1507 } |
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1508 } |
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1509 _should_revert_to_full_young_gcs = false; |
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1510 |
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1511 if (_last_young_gc_full && !_during_marking) { |
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1512 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1513 } |
1514 | |
1515 _short_lived_surv_rate_group->start_adding_regions(); | |
1516 // do that for any other surv rate groupsx | |
1517 | |
677 | 1518 if (update_stats) { |
342 | 1519 double pause_time_ms = elapsed_ms; |
1520 | |
1521 size_t diff = 0; | |
1522 if (_max_pending_cards >= _pending_cards) | |
1523 diff = _max_pending_cards - _pending_cards; | |
1524 _pending_card_diff_seq->add((double) diff); | |
1525 | |
1526 double cost_per_card_ms = 0.0; | |
1527 if (_pending_cards > 0) { | |
1528 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1529 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1530 } | |
1531 | |
1532 size_t cards_scanned = _g1->cards_scanned(); | |
1533 | |
1534 double cost_per_entry_ms = 0.0; | |
1535 if (cards_scanned > 10) { | |
1536 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1537 if (_last_young_gc_full) | |
1538 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1539 else | |
1540 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1541 } | |
1542 | |
1543 if (_max_rs_lengths > 0) { | |
1544 double cards_per_entry_ratio = | |
1545 (double) cards_scanned / (double) _max_rs_lengths; | |
1546 if (_last_young_gc_full) | |
1547 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1548 else | |
1549 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1550 } | |
1551 | |
4130
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1552 // It turns out that, sometimes, _max_rs_lengths can get smaller |
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1553 // than _recorded_rs_lengths which causes rs_length_diff to get |
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1554 // very large and mess up the RSet length predictions. We'll be |
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1555 // defensive until we work out why this happens. |
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1556 size_t rs_length_diff = 0; |
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1557 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1558 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1559 } |
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1560 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1561 |
1562 size_t copied_bytes = surviving_bytes; | |
1563 double cost_per_byte_ms = 0.0; | |
1564 if (copied_bytes > 0) { | |
1565 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1566 if (_in_marking_window) | |
1567 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1568 else | |
1569 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1570 } | |
1571 | |
1572 double all_other_time_ms = pause_time_ms - | |
1394
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1573 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1574 _mark_closure_time_ms + termination_time); |
1575 | |
1576 double young_other_time_ms = 0.0; | |
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1577 if (young_cset_region_length() > 0) { |
342 | 1578 young_other_time_ms = |
1579 _recorded_young_cset_choice_time_ms + | |
1580 _recorded_young_free_cset_time_ms; | |
1581 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1582 (double) young_cset_region_length()); |
342 | 1583 } |
1584 double non_young_other_time_ms = 0.0; | |
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1585 if (old_cset_region_length() > 0) { |
342 | 1586 non_young_other_time_ms = |
1587 _recorded_non_young_cset_choice_time_ms + | |
1588 _recorded_non_young_free_cset_time_ms; | |
1589 | |
1590 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1591 (double) old_cset_region_length()); |
342 | 1592 } |
1593 | |
1594 double constant_other_time_ms = all_other_time_ms - | |
1595 (young_other_time_ms + non_young_other_time_ms); | |
1596 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1597 | |
1598 double survival_ratio = 0.0; | |
1599 if (_bytes_in_collection_set_before_gc > 0) { | |
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1600 survival_ratio = (double) _bytes_copied_during_gc / |
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1601 (double) _bytes_in_collection_set_before_gc; |
342 | 1602 } |
1603 | |
1604 _pending_cards_seq->add((double) _pending_cards); | |
1605 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1606 | |
1607 double expensive_region_limit_ms = | |
751 | 1608 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1609 if (expensive_region_limit_ms < 0.0) { |
1610 // this means that the other time was predicted to be longer than | |
1611 // than the max pause time | |
751 | 1612 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1613 } |
1614 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1615 } | |
1616 | |
1617 _in_marking_window = new_in_marking_window; | |
1618 _in_marking_window_im = new_in_marking_window_im; | |
1619 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1620 update_young_list_target_length(); |
342 | 1621 |
1111 | 1622 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1623 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1624 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1625 |
1626 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1627 } |
1628 | |
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1629 #define EXT_SIZE_FORMAT "%d%s" |
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1630 #define EXT_SIZE_PARAMS(bytes) \ |
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1631 byte_size_in_proper_unit((bytes)), \ |
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1632 proper_unit_for_byte_size((bytes)) |
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1633 |
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1634 void G1CollectorPolicy::print_heap_transition() { |
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1635 if (PrintGCDetails) { |
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1636 YoungList* young_list = _g1->young_list(); |
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1637 size_t eden_bytes = young_list->eden_used_bytes(); |
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1638 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1639 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1640 size_t used = _g1->used(); |
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1641 size_t capacity = _g1->capacity(); |
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1642 size_t eden_capacity = |
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1643 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1644 |
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1645 gclog_or_tty->print_cr( |
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1646 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1647 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1648 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1649 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1650 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1651 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1652 EXT_SIZE_PARAMS(eden_bytes), |
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1653 EXT_SIZE_PARAMS(eden_capacity), |
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1654 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1655 EXT_SIZE_PARAMS(survivor_bytes), |
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1656 EXT_SIZE_PARAMS(used_before_gc), |
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1657 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1658 EXT_SIZE_PARAMS(used), |
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1659 EXT_SIZE_PARAMS(capacity)); |
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1660 |
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1661 _prev_eden_capacity = eden_capacity; |
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1662 } else if (PrintGC) { |
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1663 _g1->print_size_transition(gclog_or_tty, |
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1664 _cur_collection_pause_used_at_start_bytes, |
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1665 _g1->used(), _g1->capacity()); |
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1666 } |
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1667 } |
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1668 |
1111 | 1669 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1670 double update_rs_processed_buffers, | |
1671 double goal_ms) { | |
1672 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1673 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1674 | |
1282 | 1675 if (G1UseAdaptiveConcRefinement) { |
1111 | 1676 const int k_gy = 3, k_gr = 6; |
1677 const double inc_k = 1.1, dec_k = 0.9; | |
1678 | |
1679 int g = cg1r->green_zone(); | |
1680 if (update_rs_time > goal_ms) { | |
1681 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1682 } else { | |
1683 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1684 g = (int)MAX2(g * inc_k, g + 1.0); | |
1685 } | |
1686 } | |
1687 // Change the refinement threads params | |
1688 cg1r->set_green_zone(g); | |
1689 cg1r->set_yellow_zone(g * k_gy); | |
1690 cg1r->set_red_zone(g * k_gr); | |
1691 cg1r->reinitialize_threads(); | |
1692 | |
1693 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1694 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1695 cg1r->yellow_zone()); | |
1696 // Change the barrier params | |
1697 dcqs.set_process_completed_threshold(processing_threshold); | |
1698 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1699 } | |
1700 | |
1701 int curr_queue_size = dcqs.completed_buffers_num(); | |
1702 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1703 dcqs.set_completed_queue_padding(curr_queue_size); | |
1704 } else { | |
1705 dcqs.set_completed_queue_padding(0); | |
1706 } | |
1707 dcqs.notify_if_necessary(); | |
1708 } | |
1709 | |
342 | 1710 double |
1711 G1CollectorPolicy:: | |
1712 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1713 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1714 | |
1715 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1716 size_t young_num = g1h->young_list()->length(); |
342 | 1717 if (young_num == 0) |
1718 return 0.0; | |
1719 | |
1720 young_num += adjustment; | |
1721 size_t pending_cards = predict_pending_cards(); | |
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1722 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1723 predict_rs_length_diff(); |
1724 size_t card_num; | |
1725 if (full_young_gcs()) | |
1726 card_num = predict_young_card_num(rs_lengths); | |
1727 else | |
1728 card_num = predict_non_young_card_num(rs_lengths); | |
1729 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1730 double accum_yg_surv_rate = | |
1731 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1732 | |
1733 size_t bytes_to_copy = | |
1734 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1735 | |
1736 return | |
1737 predict_rs_update_time_ms(pending_cards) + | |
1738 predict_rs_scan_time_ms(card_num) + | |
1739 predict_object_copy_time_ms(bytes_to_copy) + | |
1740 predict_young_other_time_ms(young_num) + | |
1741 predict_constant_other_time_ms(); | |
1742 } | |
1743 | |
1744 double | |
1745 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1746 size_t rs_length = predict_rs_length_diff(); | |
1747 size_t card_num; | |
1748 if (full_young_gcs()) | |
1749 card_num = predict_young_card_num(rs_length); | |
1750 else | |
1751 card_num = predict_non_young_card_num(rs_length); | |
1752 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1753 } | |
1754 | |
1755 double | |
1756 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1757 size_t scanned_cards) { | |
1758 return | |
1759 predict_rs_update_time_ms(pending_cards) + | |
1760 predict_rs_scan_time_ms(scanned_cards) + | |
1761 predict_constant_other_time_ms(); | |
1762 } | |
1763 | |
1764 double | |
1765 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1766 bool young) { | |
1767 size_t rs_length = hr->rem_set()->occupied(); | |
1768 size_t card_num; | |
1769 if (full_young_gcs()) | |
1770 card_num = predict_young_card_num(rs_length); | |
1771 else | |
1772 card_num = predict_non_young_card_num(rs_length); | |
1773 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1774 | |
1775 double region_elapsed_time_ms = | |
1776 predict_rs_scan_time_ms(card_num) + | |
1777 predict_object_copy_time_ms(bytes_to_copy); | |
1778 | |
1779 if (young) | |
1780 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1781 else | |
1782 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1783 | |
1784 return region_elapsed_time_ms; | |
1785 } | |
1786 | |
1787 size_t | |
1788 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1789 size_t bytes_to_copy; | |
1790 if (hr->is_marked()) | |
1791 bytes_to_copy = hr->max_live_bytes(); | |
1792 else { | |
1793 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1794 "invariant" ); | |
1795 int age = hr->age_in_surv_rate_group(); | |
545 | 1796 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1797 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1798 } | |
1799 | |
1800 return bytes_to_copy; | |
1801 } | |
1802 | |
1803 void | |
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1804 G1CollectorPolicy::init_cset_region_lengths(size_t eden_cset_region_length, |
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1805 size_t survivor_cset_region_length) { |
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1806 _eden_cset_region_length = eden_cset_region_length; |
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1807 _survivor_cset_region_length = survivor_cset_region_length; |
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1808 _old_cset_region_length = 0; |
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1809 } |
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1810 |
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1811 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1812 _recorded_rs_lengths = rs_lengths; |
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1813 } |
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1814 |
342 | 1815 void G1CollectorPolicy::check_if_region_is_too_expensive(double |
1816 predicted_time_ms) { | |
1817 // I don't think we need to do this when in young GC mode since | |
1818 // marking will be initiated next time we hit the soft limit anyway... | |
1819 if (predicted_time_ms > _expensive_region_limit_ms) { | |
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1820 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1821 "request partially-young GCs end", |
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1822 ergo_format_reason("predicted region time higher than threshold") |
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1823 ergo_format_ms("predicted region time") |
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1824 ergo_format_ms("threshold"), |
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1825 predicted_time_ms, _expensive_region_limit_ms); |
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1826 // no point in doing another partial one |
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1827 _should_revert_to_full_young_gcs = true; |
342 | 1828 } |
1829 } | |
1830 | |
1831 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1832 double elapsed_ms) { | |
1833 _recent_gc_times_ms->add(elapsed_ms); | |
1834 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1835 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1836 } | |
1837 | |
1838 size_t G1CollectorPolicy::expansion_amount() { | |
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1839 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1840 double threshold = _gc_overhead_perc; |
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1841 if (recent_gc_overhead > threshold) { |
751 | 1842 // We will double the existing space, or take |
1843 // G1ExpandByPercentOfAvailable % of the available expansion | |
1844 // space, whichever is smaller, bounded below by a minimum | |
1845 // expansion (unless that's all that's left.) | |
342 | 1846 const size_t min_expand_bytes = 1*M; |
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1847 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1848 size_t committed_bytes = _g1->capacity(); |
1849 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1850 size_t expand_bytes; | |
1851 size_t expand_bytes_via_pct = | |
751 | 1852 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1853 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1854 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1855 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1856 |
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1857 ergo_verbose5(ErgoHeapSizing, |
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1858 "attempt heap expansion", |
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1859 ergo_format_reason("recent GC overhead higher than " |
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1860 "threshold after GC") |
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1861 ergo_format_perc("recent GC overhead") |
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1862 ergo_format_perc("threshold") |
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1863 ergo_format_byte("uncommitted") |
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1864 ergo_format_byte_perc("calculated expansion amount"), |
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1865 recent_gc_overhead, threshold, |
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1866 uncommitted_bytes, |
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1867 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1868 |
342 | 1869 return expand_bytes; |
1870 } else { | |
1871 return 0; | |
1872 } | |
1873 } | |
1874 | |
1875 class CountCSClosure: public HeapRegionClosure { | |
1876 G1CollectorPolicy* _g1_policy; | |
1877 public: | |
1878 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1879 _g1_policy(g1_policy) {} | |
1880 bool doHeapRegion(HeapRegion* r) { | |
1881 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1882 return false; | |
1883 } | |
1884 }; | |
1885 | |
1886 void G1CollectorPolicy::count_CS_bytes_used() { | |
1887 CountCSClosure cs_closure(this); | |
1888 _g1->collection_set_iterate(&cs_closure); | |
1889 } | |
1890 | |
4023 | 1891 void G1CollectorPolicy::print_summary(int level, |
1892 const char* str, | |
1893 NumberSeq* seq) const { | |
342 | 1894 double sum = seq->sum(); |
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1895 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1896 str, sum / 1000.0, seq->avg()); |
1897 } | |
1898 | |
4023 | 1899 void G1CollectorPolicy::print_summary_sd(int level, |
1900 const char* str, | |
1901 NumberSeq* seq) const { | |
342 | 1902 print_summary(level, str, seq); |
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1903 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1904 seq->num(), seq->sd(), seq->maximum()); |
1905 } | |
1906 | |
1907 void G1CollectorPolicy::check_other_times(int level, | |
1908 NumberSeq* other_times_ms, | |
1909 NumberSeq* calc_other_times_ms) const { | |
1910 bool should_print = false; | |
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1911 LineBuffer buf(level + 2); |
342 | 1912 |
1913 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1914 fabs(calc_other_times_ms->sum())); | |
1915 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1916 fabs(calc_other_times_ms->sum())); | |
1917 double sum_ratio = max_sum / min_sum; | |
1918 if (sum_ratio > 1.1) { | |
1919 should_print = true; | |
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1920 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1921 } |
1922 | |
1923 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1924 fabs(calc_other_times_ms->avg())); | |
1925 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1926 fabs(calc_other_times_ms->avg())); | |
1927 double avg_ratio = max_avg / min_avg; | |
1928 if (avg_ratio > 1.1) { | |
1929 should_print = true; | |
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1930 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1931 } |
1932 | |
1933 if (other_times_ms->sum() < -0.01) { | |
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1934 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1935 } |
1936 | |
1937 if (other_times_ms->avg() < -0.01) { | |
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1938 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1939 } |
1940 | |
1941 if (calc_other_times_ms->sum() < -0.01) { | |
1942 should_print = true; | |
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1943 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1944 } |
1945 | |
1946 if (calc_other_times_ms->avg() < -0.01) { | |
1947 should_print = true; | |
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1948 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1949 } |
1950 | |
1951 if (should_print) | |
1952 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1953 } | |
1954 | |
1955 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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1956 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1957 MainBodySummary* body_summary = summary->main_body_summary(); |
1958 if (summary->get_total_seq()->num() > 0) { | |
677 | 1959 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1960 if (body_summary != NULL) { |
1961 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
1962 if (parallel) { | |
1963 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 1964 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
1965 print_summary(2, "Mark Stack Scanning", body_summary->get_mark_stack_scan_seq()); | |
342 | 1966 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
1967 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
1968 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
1969 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 1970 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 1971 { |
1972 NumberSeq* other_parts[] = { | |
1973 body_summary->get_ext_root_scan_seq(), | |
1974 body_summary->get_mark_stack_scan_seq(), | |
4023 | 1975 body_summary->get_update_rs_seq(), |
342 | 1976 body_summary->get_scan_rs_seq(), |
1977 body_summary->get_obj_copy_seq(), | |
1978 body_summary->get_termination_seq() | |
1979 }; | |
1980 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 1981 6, other_parts); |
342 | 1982 check_other_times(2, body_summary->get_parallel_other_seq(), |
1983 &calc_other_times_ms); | |
1984 } | |
1985 } else { | |
4023 | 1986 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
1987 print_summary(1, "Mark Stack Scanning", body_summary->get_mark_stack_scan_seq()); | |
342 | 1988 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
1989 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
1990 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
1991 } | |
1992 } | |
4023 | 1993 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
1994 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
342 | 1995 print_summary(1, "Other", summary->get_other_seq()); |
1996 { | |
1779 | 1997 if (body_summary != NULL) { |
1998 NumberSeq calc_other_times_ms; | |
1999 if (parallel) { | |
2000 // parallel | |
2001 NumberSeq* other_parts[] = { | |
2002 body_summary->get_satb_drain_seq(), | |
2003 body_summary->get_parallel_seq(), | |
2004 body_summary->get_clear_ct_seq() | |
2005 }; | |
2006 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2007 3, other_parts); | |
2008 } else { | |
2009 // serial | |
2010 NumberSeq* other_parts[] = { | |
2011 body_summary->get_satb_drain_seq(), | |
2012 body_summary->get_update_rs_seq(), | |
2013 body_summary->get_ext_root_scan_seq(), | |
2014 body_summary->get_mark_stack_scan_seq(), | |
2015 body_summary->get_scan_rs_seq(), | |
2016 body_summary->get_obj_copy_seq() | |
2017 }; | |
2018 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2019 6, other_parts); | |
2020 } | |
2021 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2022 } |
2023 } | |
2024 } else { | |
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2025 LineBuffer(1).append_and_print_cr("none"); |
342 | 2026 } |
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2027 LineBuffer(0).append_and_print_cr(""); |
342 | 2028 } |
2029 | |
2030 void G1CollectorPolicy::print_tracing_info() const { | |
2031 if (TraceGen0Time) { | |
2032 gclog_or_tty->print_cr("ALL PAUSES"); | |
2033 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2034 gclog_or_tty->print_cr(""); | |
2035 gclog_or_tty->print_cr(""); | |
2036 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2037 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2038 gclog_or_tty->print_cr(""); | |
2039 | |
677 | 2040 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2041 print_summary(_summary); | |
342 | 2042 |
2043 gclog_or_tty->print_cr("MISC"); | |
2044 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2045 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2046 for (int i = 0; i < _aux_num; ++i) { | |
2047 if (_all_aux_times_ms[i].num() > 0) { | |
2048 char buffer[96]; | |
2049 sprintf(buffer, "Aux%d", i); | |
2050 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2051 } | |
2052 } | |
2053 } | |
2054 if (TraceGen1Time) { | |
2055 if (_all_full_gc_times_ms->num() > 0) { | |
2056 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2057 _all_full_gc_times_ms->num(), | |
2058 _all_full_gc_times_ms->sum() / 1000.0); | |
2059 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2060 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2061 _all_full_gc_times_ms->sd(), | |
2062 _all_full_gc_times_ms->maximum()); | |
2063 } | |
2064 } | |
2065 } | |
2066 | |
2067 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2068 #ifndef PRODUCT | |
2069 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2070 // add this call for any other surv rate groups | |
2071 #endif // PRODUCT | |
2072 } | |
2073 | |
2074 #ifndef PRODUCT | |
2075 // for debugging, bit of a hack... | |
2076 static char* | |
2077 region_num_to_mbs(int length) { | |
2078 static char buffer[64]; | |
2079 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2080 double mbs = bytes / (double) (1024 * 1024); | |
2081 sprintf(buffer, "%7.2lfMB", mbs); | |
2082 return buffer; | |
2083 } | |
2084 #endif // PRODUCT | |
2085 | |
545 | 2086 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2087 switch (purpose) { |
2088 case GCAllocForSurvived: | |
545 | 2089 return _max_survivor_regions; |
342 | 2090 case GCAllocForTenured: |
545 | 2091 return REGIONS_UNLIMITED; |
342 | 2092 default: |
545 | 2093 ShouldNotReachHere(); |
2094 return REGIONS_UNLIMITED; | |
342 | 2095 }; |
2096 } | |
2097 | |
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2098 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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2099 size_t expansion_region_num = 0; |
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2100 if (GCLockerEdenExpansionPercent > 0) { |
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2101 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2102 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2103 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2104 // less than 1.0) we'll get 1. |
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2105 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2106 } else { |
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2107 assert(expansion_region_num == 0, "sanity"); |
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2108 } |
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2109 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2110 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2111 } |
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2112 |
545 | 2113 // Calculates survivor space parameters. |
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2114 void G1CollectorPolicy::update_survivors_policy() { |
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2115 double max_survivor_regions_d = |
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2116 (double) _young_list_target_length / (double) SurvivorRatio; |
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2117 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2118 // smaller than 1.0) we'll get 1. |
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2119 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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2120 |
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2121 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2122 HeapRegion::GrainWords * _max_survivor_regions); |
2123 } | |
2124 | |
342 | 2125 #ifndef PRODUCT |
2126 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2127 CollectionSetChooser* _chooser; | |
2128 public: | |
2129 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2130 _chooser(chooser) {} | |
2131 | |
2132 bool doHeapRegion(HeapRegion* r) { | |
2133 if (!r->continuesHumongous()) { | |
2134 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2135 } | |
2136 return false; | |
2137 } | |
2138 }; | |
2139 | |
4013 | 2140 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2141 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2142 _g1->heap_region_iterate(&cl); | |
2143 return true; | |
2144 } | |
2145 #endif | |
2146 | |
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2147 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2148 GCCause::Cause gc_cause) { |
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2149 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2150 if (!during_cycle) { |
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2151 ergo_verbose1(ErgoConcCycles, |
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2152 "request concurrent cycle initiation", |
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2153 ergo_format_reason("requested by GC cause") |
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2154 ergo_format_str("GC cause"), |
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2155 GCCause::to_string(gc_cause)); |
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2156 set_initiate_conc_mark_if_possible(); |
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2157 return true; |
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2158 } else { |
3914
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2159 ergo_verbose1(ErgoConcCycles, |
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2160 "do not request concurrent cycle initiation", |
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2161 ergo_format_reason("concurrent cycle already in progress") |
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2162 ergo_format_str("GC cause"), |
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2163 GCCause::to_string(gc_cause)); |
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2164 return false; |
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2165 } |
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2166 } |
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2167 |
342 | 2168 void |
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2169 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2170 // We are about to decide on whether this pause will be an |
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2171 // initial-mark pause. |
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2172 |
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2173 // First, during_initial_mark_pause() should not be already set. We |
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2174 // will set it here if we have to. However, it should be cleared by |
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2175 // the end of the pause (it's only set for the duration of an |
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2176 // initial-mark pause). |
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2177 assert(!during_initial_mark_pause(), "pre-condition"); |
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2178 |
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2179 if (initiate_conc_mark_if_possible()) { |
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2180 // We had noticed on a previous pause that the heap occupancy has |
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2181 // gone over the initiating threshold and we should start a |
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2182 // concurrent marking cycle. So we might initiate one. |
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2183 |
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2184 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2185 if (!during_cycle) { |
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2186 // The concurrent marking thread is not "during a cycle", i.e., |
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2187 // it has completed the last one. So we can go ahead and |
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2188 // initiate a new cycle. |
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2189 |
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2190 set_during_initial_mark_pause(); |
3982
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2191 // We do not allow non-full young GCs during marking. |
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2192 if (!full_young_gcs()) { |
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2193 set_full_young_gcs(true); |
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2194 ergo_verbose0(ErgoPartiallyYoungGCs, |
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2195 "end partially-young GCs", |
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2196 ergo_format_reason("concurrent cycle is about to start")); |
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2197 } |
1359
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2198 |
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2199 // And we can now clear initiate_conc_mark_if_possible() as |
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2200 // we've already acted on it. |
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2201 clear_initiate_conc_mark_if_possible(); |
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2202 |
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2203 ergo_verbose0(ErgoConcCycles, |
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2204 "initiate concurrent cycle", |
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2205 ergo_format_reason("concurrent cycle initiation requested")); |
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2206 } else { |
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2207 // The concurrent marking thread is still finishing up the |
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2208 // previous cycle. If we start one right now the two cycles |
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2209 // overlap. In particular, the concurrent marking thread might |
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2210 // be in the process of clearing the next marking bitmap (which |
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2211 // we will use for the next cycle if we start one). Starting a |
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2212 // cycle now will be bad given that parts of the marking |
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2213 // information might get cleared by the marking thread. And we |
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2214 // cannot wait for the marking thread to finish the cycle as it |
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2215 // periodically yields while clearing the next marking bitmap |
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2216 // and, if it's in a yield point, it's waiting for us to |
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2217 // finish. So, at this point we will not start a cycle and we'll |
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2218 // let the concurrent marking thread complete the last one. |
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2219 ergo_verbose0(ErgoConcCycles, |
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2220 "do not initiate concurrent cycle", |
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2221 ergo_format_reason("concurrent cycle already in progress")); |
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2222 } |
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2223 } |
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2224 } |
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2225 |
342 | 2226 class KnownGarbageClosure: public HeapRegionClosure { |
2227 CollectionSetChooser* _hrSorted; | |
2228 | |
2229 public: | |
2230 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2231 _hrSorted(hrSorted) | |
2232 {} | |
2233 | |
2234 bool doHeapRegion(HeapRegion* r) { | |
2235 // We only include humongous regions in collection | |
2236 // sets when concurrent mark shows that their contained object is | |
2237 // unreachable. | |
2238 | |
2239 // Do we have any marking information for this region? | |
2240 if (r->is_marked()) { | |
2241 // We don't include humongous regions in collection | |
2242 // sets because we collect them immediately at the end of a marking | |
2243 // cycle. We also don't include young regions because we *must* | |
2244 // include them in the next collection pause. | |
2245 if (!r->isHumongous() && !r->is_young()) { | |
2246 _hrSorted->addMarkedHeapRegion(r); | |
2247 } | |
2248 } | |
2249 return false; | |
2250 } | |
2251 }; | |
2252 | |
2253 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2254 CollectionSetChooser* _hrSorted; | |
2255 jint _marked_regions_added; | |
2256 jint _chunk_size; | |
2257 jint _cur_chunk_idx; | |
2258 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2259 int _worker; | |
2260 int _invokes; | |
2261 | |
2262 void get_new_chunk() { | |
2263 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2264 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2265 } | |
2266 void add_region(HeapRegion* r) { | |
2267 if (_cur_chunk_idx == _cur_chunk_end) { | |
2268 get_new_chunk(); | |
2269 } | |
2270 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2271 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2272 _marked_regions_added++; | |
2273 _cur_chunk_idx++; | |
2274 } | |
2275 | |
2276 public: | |
2277 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2278 jint chunk_size, | |
2279 int worker) : | |
2280 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2281 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2282 _invokes(0) | |
2283 {} | |
2284 | |
2285 bool doHeapRegion(HeapRegion* r) { | |
2286 // We only include humongous regions in collection | |
2287 // sets when concurrent mark shows that their contained object is | |
2288 // unreachable. | |
2289 _invokes++; | |
2290 | |
2291 // Do we have any marking information for this region? | |
2292 if (r->is_marked()) { | |
2293 // We don't include humongous regions in collection | |
2294 // sets because we collect them immediately at the end of a marking | |
2295 // cycle. | |
2296 // We also do not include young regions in collection sets | |
2297 if (!r->isHumongous() && !r->is_young()) { | |
2298 add_region(r); | |
2299 } | |
2300 } | |
2301 return false; | |
2302 } | |
2303 jint marked_regions_added() { return _marked_regions_added; } | |
2304 int invokes() { return _invokes; } | |
2305 }; | |
2306 | |
2307 class ParKnownGarbageTask: public AbstractGangTask { | |
2308 CollectionSetChooser* _hrSorted; | |
2309 jint _chunk_size; | |
2310 G1CollectedHeap* _g1; | |
2311 public: | |
2312 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2313 AbstractGangTask("ParKnownGarbageTask"), | |
2314 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2315 _g1(G1CollectedHeap::heap()) | |
2316 {} | |
2317 | |
2318 void work(int i) { | |
2319 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2320 // Back to zero for the claim value. | |
355 | 2321 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
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2322 _g1->workers()->active_workers(), |
355 | 2323 HeapRegion::InitialClaimValue); |
342 | 2324 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2325 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2326 if (G1PrintParCleanupStats) { | |
2363
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2327 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2328 i, parKnownGarbageCl.invokes(), regions_added); |
2329 } | |
2330 } | |
2331 }; | |
2332 | |
2333 void | |
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2334 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
4013 | 2335 double start_sec; |
2336 if (G1PrintParCleanupStats) { | |
2337 start_sec = os::elapsedTime(); | |
2338 } | |
342 | 2339 |
2340 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2341 double clear_marked_end_sec; |
342 | 2342 if (G1PrintParCleanupStats) { |
4013 | 2343 clear_marked_end_sec = os::elapsedTime(); |
2344 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2345 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2346 } |
4013 | 2347 |
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2348 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2349 const size_t OverpartitionFactor = 4; |
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2350 size_t WorkUnit; |
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2351 // The use of MinChunkSize = 8 in the original code |
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2352 // causes some assertion failures when the total number of |
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2353 // region is less than 8. The code here tries to fix that. |
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2354 // Should the original code also be fixed? |
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2355 if (no_of_gc_threads > 0) { |
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2356 const size_t MinWorkUnit = |
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2357 MAX2(_g1->n_regions() / no_of_gc_threads, (size_t) 1U); |
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2358 WorkUnit = |
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2359 MAX2(_g1->n_regions() / (no_of_gc_threads * OverpartitionFactor), |
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2360 MinWorkUnit); |
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2361 } else { |
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2362 assert(no_of_gc_threads > 0, |
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2363 "The active gc workers should be greater than 0"); |
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2364 // In a product build do something reasonable to avoid a crash. |
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2365 const size_t MinWorkUnit = |
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2366 MAX2(_g1->n_regions() / ParallelGCThreads, (size_t) 1U); |
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2367 WorkUnit = |
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2368 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2369 MinWorkUnit); |
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2370 } |
342 | 2371 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2372 WorkUnit); |
342 | 2373 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2374 (int) WorkUnit); |
342 | 2375 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2376 |
2377 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2378 "sanity check"); | |
342 | 2379 } else { |
2380 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2381 _g1->heap_region_iterate(&knownGarbagecl); | |
2382 } | |
4013 | 2383 double known_garbage_end_sec; |
342 | 2384 if (G1PrintParCleanupStats) { |
4013 | 2385 known_garbage_end_sec = os::elapsedTime(); |
342 | 2386 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2387 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2388 } |
4013 | 2389 |
342 | 2390 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2391 double end_sec = os::elapsedTime(); |
342 | 2392 if (G1PrintParCleanupStats) { |
2393 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2394 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2395 } |
2396 | |
4013 | 2397 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2398 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2399 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2400 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2401 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2402 } |
2403 | |
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2404 // Add the heap region at the head of the non-incremental collection set |
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2405 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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2406 assert(_inc_cset_build_state == Active, "Precondition"); |
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2407 assert(!hr->is_young(), "non-incremental add of young region"); |
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2408 |
342 | 2409 if (_g1->mark_in_progress()) |
2410 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2411 | |
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2412 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2413 hr->set_in_collection_set(true); |
2414 hr->set_next_in_collection_set(_collection_set); | |
2415 _collection_set = hr; | |
2416 _collection_set_bytes_used_before += hr->used(); | |
526 | 2417 _g1->register_region_with_in_cset_fast_test(hr); |
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2418 size_t rs_length = hr->rem_set()->occupied(); |
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2419 _recorded_rs_lengths += rs_length; |
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2420 _old_cset_region_length += 1; |
342 | 2421 } |
2422 | |
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2423 // Initialize the per-collection-set information |
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2424 void G1CollectorPolicy::start_incremental_cset_building() { |
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2425 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2426 |
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2427 _inc_cset_head = NULL; |
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2428 _inc_cset_tail = NULL; |
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2429 _inc_cset_bytes_used_before = 0; |
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2430 |
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2431 _inc_cset_max_finger = 0; |
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2432 _inc_cset_recorded_rs_lengths = 0; |
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2433 _inc_cset_predicted_elapsed_time_ms = 0; |
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2434 _inc_cset_build_state = Active; |
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2435 } |
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|
2436 |
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2437 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2438 // This routine is used when: |
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2439 // * adding survivor regions to the incremental cset at the end of an |
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2440 // evacuation pause, |
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2441 // * adding the current allocation region to the incremental cset |
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2442 // when it is retired, and |
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2443 // * updating existing policy information for a region in the |
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2444 // incremental cset via young list RSet sampling. |
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2445 // Therefore this routine may be called at a safepoint by the |
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2446 // VM thread, or in-between safepoints by mutator threads (when |
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2447 // retiring the current allocation region) or a concurrent |
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2448 // refine thread (RSet sampling). |
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|
2449 |
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2450 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2451 size_t used_bytes = hr->used(); |
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2452 |
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2453 _inc_cset_recorded_rs_lengths += rs_length; |
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2454 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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|
2455 |
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2456 _inc_cset_bytes_used_before += used_bytes; |
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|
2457 |
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|
2458 // Cache the values we have added to the aggregated informtion |
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2459 // in the heap region in case we have to remove this region from |
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2460 // the incremental collection set, or it is updated by the |
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|
2461 // rset sampling code |
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|
2462 hr->set_recorded_rs_length(rs_length); |
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2463 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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|
2464 } |
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|
2465 |
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|
2466 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
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2467 // This routine is currently only called as part of the updating of |
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2468 // existing policy information for regions in the incremental cset that |
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2469 // is performed by the concurrent refine thread(s) as part of young list |
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2470 // RSet sampling. Therefore we should not be at a safepoint. |
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|
2471 |
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|
2472 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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|
2473 assert(hr->is_young(), "it should be"); |
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|
2474 |
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2475 size_t used_bytes = hr->used(); |
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2476 size_t old_rs_length = hr->recorded_rs_length(); |
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2477 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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|
2478 |
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2479 // Subtract the old recorded/predicted policy information for |
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2480 // the given heap region from the collection set info. |
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2481 _inc_cset_recorded_rs_lengths -= old_rs_length; |
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2482 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
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|
2483 |
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2484 _inc_cset_bytes_used_before -= used_bytes; |
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|
2485 |
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2486 // Clear the values cached in the heap region |
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|
2487 hr->set_recorded_rs_length(0); |
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|
2488 hr->set_predicted_elapsed_time_ms(0); |
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|
2489 } |
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|
2490 |
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|
2491 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
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2492 // Update the collection set information that is dependent on the new RS length |
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2493 assert(hr->is_young(), "Precondition"); |
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|
2494 |
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2495 remove_from_incremental_cset_info(hr); |
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|
2496 add_to_incremental_cset_info(hr, new_rs_length); |
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|
2497 } |
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|
2498 |
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|
2499 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
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2500 assert(hr->is_young(), "invariant"); |
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2501 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
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|
2502 assert(_inc_cset_build_state == Active, "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2503 |
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
|
2504 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2505 // 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
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parents:
1391
diff
changeset
|
2506 // 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
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parents:
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diff
changeset
|
2507 // 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:
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diff
changeset
|
2508 // 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
|
2509 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2510 |
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
|
2511 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2512 add_to_incremental_cset_info(hr, rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2513 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2514 HeapWord* hr_end = hr->end(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2515 _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
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parents:
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diff
changeset
|
2516 |
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
|
2517 assert(!hr->in_collection_set(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2518 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:
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diff
changeset
|
2519 assert( hr->next_in_collection_set() == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2520 |
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
|
2521 _g1->register_region_with_in_cset_fast_test(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2522 } |
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
|
2523 |
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
|
2524 // Add the region at the RHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2525 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2526 // 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:
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diff
changeset
|
2527 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
|
2528 |
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
|
2529 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2530 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2531 |
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
|
2532 // 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:
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diff
changeset
|
2533 if (_inc_cset_tail == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2534 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2535 _inc_cset_head = hr; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2536 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2537 _inc_cset_tail->set_next_in_collection_set(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2538 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2539 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2540 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2541 |
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
|
2542 // Add the region to the LHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2543 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2544 // Survivors should be added to the RHS at the end of a pause |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2545 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
|
2546 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2547 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2548 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2549 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2550 // Add the region at the left hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2551 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
|
2552 if (_inc_cset_head == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2553 assert(_inc_cset_tail == NULL, "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2554 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2555 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2556 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2557 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2558 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2559 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2560 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2561 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2562 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2563 st->print_cr("\nCollection_set:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2564 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2565 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2566 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2567 assert(csr->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2568 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2569 "age: %4d, y: %d, surv: %d", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2570 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2571 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2572 csr->prev_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2573 csr->next_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2574 csr->top_at_conc_mark_count(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2575 csr->age_in_surv_rate_group_cond(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2576 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2577 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2578 csr = next; |
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 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2581 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2582 |
4013 | 2583 void G1CollectorPolicy::choose_collection_set(double target_pause_time_ms) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2584 // Set this here - in case we're not doing young collections. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2585 double non_young_start_time_sec = os::elapsedTime(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2586 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2587 YoungList* young_list = _g1->young_list(); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2588 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2589 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2590 err_msg("target_pause_time_ms = %1.6lf should be positive", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2591 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2592 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2593 |
2594 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2595 double predicted_pause_time_ms = base_time_ms; | |
2596 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2597 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2598 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2599 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2600 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2601 ergo_format_ms("predicted base time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2602 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2603 ergo_format_ms("target pause time"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2604 base_time_ms, time_remaining_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2605 |
342 | 2606 // the 10% and 50% values are arbitrary... |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2607 double threshold = 0.10 * target_pause_time_ms; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2608 if (time_remaining_ms < threshold) { |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2609 double prev_time_remaining_ms = time_remaining_ms; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2610 time_remaining_ms = 0.50 * target_pause_time_ms; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2611 ergo_verbose3(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2612 "adjust remaining time", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2613 ergo_format_reason("remaining time lower than threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2614 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2615 ergo_format_ms("threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2616 ergo_format_ms("adjusted remaining time"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2617 prev_time_remaining_ms, threshold, time_remaining_ms); |
342 | 2618 } |
2619 | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2620 size_t expansion_bytes = _g1->expansion_regions() * HeapRegion::GrainBytes; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2621 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2622 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2623 double young_start_time_sec = os::elapsedTime(); |
342 | 2624 |
677 | 2625 _collection_set_bytes_used_before = 0; |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2626 _last_young_gc_full = full_young_gcs() ? true : false; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2627 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2628 if (_last_young_gc_full) { |
3867
ff53346271fe
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2629 ++_full_young_pause_num; |
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2630 } else { |
3867
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2631 ++_partial_young_pause_num; |
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2632 } |
3867
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2633 |
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2634 // The young list is laid with the survivor regions from the previous |
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2635 // pause are appended to the RHS of the young list, i.e. |
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2636 // [Newly Young Regions ++ Survivors from last pause]. |
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2637 |
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2638 size_t survivor_region_length = young_list->survivor_length(); |
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2639 size_t eden_region_length = young_list->length() - survivor_region_length; |
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2640 init_cset_region_lengths(eden_region_length, survivor_region_length); |
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2641 hr = young_list->first_survivor_region(); |
3867
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2642 while (hr != NULL) { |
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2643 assert(hr->is_survivor(), "badly formed young list"); |
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2644 hr->set_young(); |
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2645 hr = hr->get_next_young_region(); |
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2646 } |
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2647 |
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2648 // Clear the fields that point to the survivor list - they are all young now. |
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2649 young_list->clear_survivors(); |
3867
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2650 |
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2651 if (_g1->mark_in_progress()) |
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2652 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
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2653 |
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2654 _collection_set = _inc_cset_head; |
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2655 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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2656 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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2657 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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2658 |
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2659 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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2660 "add young regions to CSet", |
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2661 ergo_format_region("eden") |
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2662 ergo_format_region("survivors") |
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2663 ergo_format_ms("predicted young region time"), |
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2664 eden_region_length, survivor_region_length, |
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2665 _inc_cset_predicted_elapsed_time_ms); |
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2666 |
3867
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2667 // The number of recorded young regions is the incremental |
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2668 // collection set's current size |
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2669 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2670 |
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2671 double young_end_time_sec = os::elapsedTime(); |
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2672 _recorded_young_cset_choice_time_ms = |
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2673 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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2674 |
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2675 // We are doing young collections so reset this. |
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2676 non_young_start_time_sec = young_end_time_sec; |
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2677 |
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2678 if (!full_young_gcs()) { |
342 | 2679 bool should_continue = true; |
2680 NumberSeq seq; | |
2681 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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2682 |
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|
2683 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
342 | 2684 do { |
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2685 // Note that add_old_region_to_cset() increments the |
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|
2686 // _old_cset_region_length field and cset_region_length() returns the |
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|
2687 // sum of _eden_cset_region_length, _survivor_cset_region_length, and |
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|
2688 // _old_cset_region_length. So, as old regions are added to the |
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2689 // CSet, _old_cset_region_length will be incremented and |
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2690 // cset_region_length(), which is used below, will always reflect |
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|
2691 // the the total number of regions added up to this point to the CSet. |
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2692 |
342 | 2693 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, |
2694 avg_prediction); | |
677 | 2695 if (hr != NULL) { |
4072 | 2696 _g1->old_set_remove(hr); |
342 | 2697 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2698 time_remaining_ms -= predicted_time_ms; | |
2699 predicted_pause_time_ms += predicted_time_ms; | |
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|
2700 add_old_region_to_cset(hr); |
342 | 2701 seq.add(predicted_time_ms); |
2702 avg_prediction = seq.avg() + seq.sd(); | |
2703 } | |
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|
2704 |
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|
2705 should_continue = true; |
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|
2706 if (hr == NULL) { |
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|
2707 // No need for an ergo verbose message here, |
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|
2708 // getNextMarkRegion() does this when it returns NULL. |
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|
2709 should_continue = false; |
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|
2710 } else { |
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|
2711 if (adaptive_young_list_length()) { |
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|
2712 if (time_remaining_ms < 0.0) { |
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|
2713 ergo_verbose1(ErgoCSetConstruction, |
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|
2714 "stop adding old regions to CSet", |
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|
2715 ergo_format_reason("remaining time is lower than 0") |
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|
2716 ergo_format_ms("remaining time"), |
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|
2717 time_remaining_ms); |
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|
2718 should_continue = false; |
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|
2719 } |
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|
2720 } else { |
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|
2721 if (cset_region_length() >= _young_list_fixed_length) { |
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|
2722 ergo_verbose2(ErgoCSetConstruction, |
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|
2723 "stop adding old regions to CSet", |
3927
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7089625: G1: policy for how many old regions to add to the CSet (when young gen is fixed) is broken
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3920
diff
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|
2724 ergo_format_reason("CSet length reached target") |
3914
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|
2725 ergo_format_region("CSet") |
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|
2726 ergo_format_region("young target"), |
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|
2727 cset_region_length(), _young_list_fixed_length); |
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|
2728 should_continue = false; |
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|
2729 } |
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|
2730 } |
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|
2731 } |
342 | 2732 } while (should_continue); |
2733 | |
2734 if (!adaptive_young_list_length() && | |
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|
2735 cset_region_length() < _young_list_fixed_length) { |
3914
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|
2736 ergo_verbose2(ErgoCSetConstruction, |
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|
2737 "request partially-young GCs end", |
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|
2738 ergo_format_reason("CSet length lower than target") |
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|
2739 ergo_format_region("CSet") |
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|
2740 ergo_format_region("young target"), |
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|
2741 cset_region_length(), _young_list_fixed_length); |
342 | 2742 _should_revert_to_full_young_gcs = true; |
3914
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|
2743 } |
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|
2744 |
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|
2745 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
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|
2746 "add old regions to CSet", |
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|
2747 ergo_format_region("old") |
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diff
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|
2748 ergo_format_ms("predicted old region time"), |
4090
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|
2749 old_cset_region_length(), |
3914
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|
2750 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
342 | 2751 } |
2752 | |
1394
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|
2753 stop_incremental_cset_building(); |
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diff
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|
2754 |
342 | 2755 count_CS_bytes_used(); |
2756 | |
3914
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|
2757 ergo_verbose5(ErgoCSetConstruction, |
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diff
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|
2758 "finish choosing CSet", |
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|
2759 ergo_format_region("eden") |
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diff
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|
2760 ergo_format_region("survivors") |
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2761 ergo_format_region("old") |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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2762 ergo_format_ms("predicted pause time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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2763 ergo_format_ms("target pause time"), |
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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2764 eden_region_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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2765 old_cset_region_length(), |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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2766 predicted_pause_time_ms, target_pause_time_ms); |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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2767 |
342 | 2768 double non_young_end_time_sec = os::elapsedTime(); |
2769 _recorded_non_young_cset_choice_time_ms = | |
2770 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2771 } |