Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 6030:48fac5d60c3c
7163848: G1: Log GC Cause for a GC
Reviewed-by: johnc, jwilhelm, jmasa
author | brutisso |
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date | Wed, 25 Apr 2012 12:36:37 +0200 |
parents | 8a2e5a6a19a4 |
children | 3a22b77e755a |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 33 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
34 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
35 #include "runtime/arguments.hpp" | |
36 #include "runtime/java.hpp" | |
37 #include "runtime/mutexLocker.hpp" | |
38 #include "utilities/debug.hpp" | |
342 | 39 |
40 // Different defaults for different number of GC threads | |
41 // They were chosen by running GCOld and SPECjbb on debris with different | |
42 // numbers of GC threads and choosing them based on the results | |
43 | |
44 // all the same | |
45 static double rs_length_diff_defaults[] = { | |
46 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
47 }; | |
48 | |
49 static double cost_per_card_ms_defaults[] = { | |
50 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
51 }; | |
52 | |
53 // all the same | |
4710 | 54 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 55 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
56 }; | |
57 | |
58 static double cost_per_entry_ms_defaults[] = { | |
59 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
60 }; | |
61 | |
62 static double cost_per_byte_ms_defaults[] = { | |
63 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
64 }; | |
65 | |
66 // these should be pretty consistent | |
67 static double constant_other_time_ms_defaults[] = { | |
68 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
69 }; | |
70 | |
71 | |
72 static double young_other_cost_per_region_ms_defaults[] = { | |
73 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
74 }; | |
75 | |
76 static double non_young_other_cost_per_region_ms_defaults[] = { | |
77 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
78 }; | |
79 | |
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80 // Help class for avoiding interleaved logging |
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81 class LineBuffer: public StackObj { |
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82 |
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83 private: |
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84 static const int BUFFER_LEN = 1024; |
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85 static const int INDENT_CHARS = 3; |
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86 char _buffer[BUFFER_LEN]; |
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87 int _indent_level; |
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88 int _cur; |
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89 |
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90 void vappend(const char* format, va_list ap) { |
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91 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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92 if (res != -1) { |
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93 _cur += res; |
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94 } else { |
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95 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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96 _buffer[BUFFER_LEN -1] = 0; |
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97 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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98 } |
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99 } |
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100 |
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101 public: |
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102 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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103 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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104 _buffer[_cur] = ' '; |
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105 } |
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106 } |
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107 |
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108 #ifndef PRODUCT |
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109 ~LineBuffer() { |
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110 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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111 } |
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112 #endif |
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113 |
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114 void append(const char* format, ...) { |
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115 va_list ap; |
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116 va_start(ap, format); |
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117 vappend(format, ap); |
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118 va_end(ap); |
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119 } |
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120 |
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121 void append_and_print_cr(const char* format, ...) { |
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122 va_list ap; |
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123 va_start(ap, format); |
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124 vappend(format, ap); |
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125 va_end(ap); |
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126 gclog_or_tty->print_cr("%s", _buffer); |
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127 _cur = _indent_level * INDENT_CHARS; |
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128 } |
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129 }; |
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130 |
342 | 131 G1CollectorPolicy::G1CollectorPolicy() : |
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132 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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133 ? ParallelGCThreads : 1), |
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134 |
342 | 135 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
136 _all_pause_times_ms(new NumberSeq()), | |
137 _stop_world_start(0.0), | |
138 _all_stop_world_times_ms(new NumberSeq()), | |
139 _all_yield_times_ms(new NumberSeq()), | |
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 _root_region_scan_wait_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)), | |
4710 | 171 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
172 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 173 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 174 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 175 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
176 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
177 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
178 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
179 _non_young_other_cost_per_region_ms_seq( | |
180 new TruncatedSeq(TruncatedSeqLength)), | |
181 | |
182 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
184 | |
751 | 185 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 186 |
4710 | 187 _gcs_are_young(true), |
188 _young_pause_num(0), | |
189 _mixed_pause_num(0), | |
342 | 190 |
191 _during_marking(false), | |
192 _in_marking_window(false), | |
193 _in_marking_window_im(false), | |
194 | |
4710 | 195 _recent_prev_end_times_for_all_gcs_sec( |
196 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 197 |
198 _recent_avg_pause_time_ratio(0.0), | |
199 | |
200 _all_full_gc_times_ms(new NumberSeq()), | |
201 | |
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202 _initiate_conc_mark_if_possible(false), |
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203 _during_initial_mark_pause(false), |
4710 | 204 _last_young_gc(false), |
205 _last_gc_was_young(false), | |
342 | 206 |
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207 _eden_bytes_before_gc(0), |
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208 _survivor_bytes_before_gc(0), |
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209 _capacity_before_gc(0), |
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210 |
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211 _eden_cset_region_length(0), |
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212 _survivor_cset_region_length(0), |
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213 _old_cset_region_length(0), |
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214 |
342 | 215 _collection_set(NULL), |
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216 _collection_set_bytes_used_before(0), |
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217 |
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218 // Incremental CSet attributes |
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219 _inc_cset_build_state(Inactive), |
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220 _inc_cset_head(NULL), |
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221 _inc_cset_tail(NULL), |
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222 _inc_cset_bytes_used_before(0), |
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223 _inc_cset_max_finger(NULL), |
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224 _inc_cset_recorded_rs_lengths(0), |
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225 _inc_cset_recorded_rs_lengths_diffs(0), |
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226 _inc_cset_predicted_elapsed_time_ms(0.0), |
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227 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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228 |
342 | 229 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
230 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
231 #endif // _MSC_VER | |
232 | |
233 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
234 G1YoungSurvRateNumRegionsSummary)), | |
235 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 236 G1YoungSurvRateNumRegionsSummary)), |
342 | 237 // add here any more surv rate groups |
545 | 238 _recorded_survivor_regions(0), |
239 _recorded_survivor_head(NULL), | |
240 _recorded_survivor_tail(NULL), | |
1356 | 241 _survivors_age_table(true), |
242 | |
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243 _gc_overhead_perc(0.0) { |
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244 |
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245 // Set up the region size and associated fields. Given that the |
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246 // policy is created before the heap, we have to set this up here, |
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247 // so it's done as soon as possible. |
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248 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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249 HeapRegionRemSet::setup_remset_size(); |
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250 |
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251 G1ErgoVerbose::initialize(); |
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252 if (PrintAdaptiveSizePolicy) { |
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253 // Currently, we only use a single switch for all the heuristics. |
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254 G1ErgoVerbose::set_enabled(true); |
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255 // Given that we don't currently have a verboseness level |
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256 // parameter, we'll hardcode this to high. This can be easily |
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257 // changed in the future. |
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258 G1ErgoVerbose::set_level(ErgoHigh); |
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259 } else { |
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260 G1ErgoVerbose::set_enabled(false); |
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261 } |
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262 |
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263 // Verify PLAB sizes |
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264 const size_t region_size = HeapRegion::GrainWords; |
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265 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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266 char buffer[128]; |
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267 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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268 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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269 vm_exit_during_initialization(buffer); |
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270 } |
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271 |
342 | 272 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
273 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
274 | |
1611 | 275 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 276 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
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277 _par_last_satb_filtering_times_ms = new double[_parallel_gc_threads]; |
342 | 278 |
279 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
280 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
281 | |
282 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
283 | |
284 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
285 | |
286 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 287 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
288 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 289 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
4023 | 290 _par_last_gc_worker_other_times_ms = new double[_parallel_gc_threads]; |
342 | 291 |
292 int index; | |
293 if (ParallelGCThreads == 0) | |
294 index = 0; | |
295 else if (ParallelGCThreads > 8) | |
296 index = 7; | |
297 else | |
298 index = ParallelGCThreads - 1; | |
299 | |
300 _pending_card_diff_seq->add(0.0); | |
301 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
302 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 303 _young_cards_per_entry_ratio_seq->add( |
304 young_cards_per_entry_ratio_defaults[index]); | |
342 | 305 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
306 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
307 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
308 _young_other_cost_per_region_ms_seq->add( | |
309 young_other_cost_per_region_ms_defaults[index]); | |
310 _non_young_other_cost_per_region_ms_seq->add( | |
311 non_young_other_cost_per_region_ms_defaults[index]); | |
312 | |
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313 // Below, we might need to calculate the pause time target based on |
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314 // the pause interval. When we do so we are going to give G1 maximum |
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315 // flexibility and allow it to do pauses when it needs to. So, we'll |
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316 // arrange that the pause interval to be pause time target + 1 to |
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317 // ensure that a) the pause time target is maximized with respect to |
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318 // the pause interval and b) we maintain the invariant that pause |
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319 // time target < pause interval. If the user does not want this |
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320 // maximum flexibility, they will have to set the pause interval |
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321 // explicitly. |
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322 |
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323 // First make sure that, if either parameter is set, its value is |
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324 // reasonable. |
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325 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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326 if (MaxGCPauseMillis < 1) { |
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327 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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328 "greater than 0"); |
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329 } |
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330 } |
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331 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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332 if (GCPauseIntervalMillis < 1) { |
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333 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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334 "greater than 0"); |
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335 } |
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336 } |
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337 |
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338 // Then, if the pause time target parameter was not set, set it to |
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339 // the default value. |
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340 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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341 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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342 // The default pause time target in G1 is 200ms |
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343 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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344 } else { |
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345 // We do not allow the pause interval to be set without the |
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346 // pause time target |
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347 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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348 "without setting MaxGCPauseMillis"); |
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349 } |
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350 } |
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351 |
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352 // Then, if the interval parameter was not set, set it according to |
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353 // the pause time target (this will also deal with the case when the |
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354 // pause time target is the default value). |
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355 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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356 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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357 } |
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358 |
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359 // Finally, make sure that the two parameters are consistent. |
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360 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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361 char buffer[256]; |
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362 jio_snprintf(buffer, 256, |
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363 "MaxGCPauseMillis (%u) should be less than " |
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364 "GCPauseIntervalMillis (%u)", |
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365 MaxGCPauseMillis, GCPauseIntervalMillis); |
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366 vm_exit_during_initialization(buffer); |
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367 } |
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368 |
751 | 369 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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370 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 371 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 372 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 373 |
374 // start conservatively (around 50ms is about right) | |
375 _concurrent_mark_remark_times_ms->add(0.05); | |
376 _concurrent_mark_cleanup_times_ms->add(0.20); | |
377 _tenuring_threshold = MaxTenuringThreshold; | |
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378 // _max_survivor_regions will be calculated by |
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379 // update_young_list_target_length() during initialization. |
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380 _max_survivor_regions = 0; |
545 | 381 |
1356 | 382 assert(GCTimeRatio > 0, |
383 "we should have set it to a default value set_g1_gc_flags() " | |
384 "if a user set it to 0"); | |
385 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
386 | |
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387 uintx reserve_perc = G1ReservePercent; |
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388 // Put an artificial ceiling on this so that it's not set to a silly value. |
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389 if (reserve_perc > 50) { |
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390 reserve_perc = 50; |
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391 warning("G1ReservePercent is set to a value that is too large, " |
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392 "it's been updated to %u", reserve_perc); |
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393 } |
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394 _reserve_factor = (double) reserve_perc / 100.0; |
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395 // This will be set when the heap is expanded |
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396 // for the first time during initialization. |
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397 _reserve_regions = 0; |
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398 |
342 | 399 initialize_all(); |
4013 | 400 _collectionSetChooser = new CollectionSetChooser(); |
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401 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 402 } |
403 | |
404 void G1CollectorPolicy::initialize_flags() { | |
405 set_min_alignment(HeapRegion::GrainBytes); | |
406 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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407 if (SurvivorRatio < 1) { |
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408 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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409 } |
342 | 410 CollectorPolicy::initialize_flags(); |
411 } | |
412 | |
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413 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
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414 assert(G1DefaultMinNewGenPercent <= G1DefaultMaxNewGenPercent, "Min larger than max"); |
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415 assert(G1DefaultMinNewGenPercent > 0 && G1DefaultMinNewGenPercent < 100, "Min out of bounds"); |
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416 assert(G1DefaultMaxNewGenPercent > 0 && G1DefaultMaxNewGenPercent < 100, "Max out of bounds"); |
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417 |
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418 if (FLAG_IS_CMDLINE(NewRatio)) { |
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419 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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420 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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421 } else { |
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422 _sizer_kind = SizerNewRatio; |
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423 _adaptive_size = false; |
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424 return; |
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425 } |
3976 | 426 } |
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427 |
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428 if (FLAG_IS_CMDLINE(NewSize)) { |
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429 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), |
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430 1U); |
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431 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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432 _max_desired_young_length = |
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433 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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434 1U); |
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435 _sizer_kind = SizerMaxAndNewSize; |
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436 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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437 } else { |
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438 _sizer_kind = SizerNewSizeOnly; |
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439 } |
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440 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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441 _max_desired_young_length = |
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442 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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443 1U); |
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444 _sizer_kind = SizerMaxNewSizeOnly; |
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445 } |
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446 } |
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447 |
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448 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { |
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449 uint default_value = (new_number_of_heap_regions * G1DefaultMinNewGenPercent) / 100; |
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450 return MAX2(1U, default_value); |
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451 } |
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452 |
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453 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { |
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454 uint default_value = (new_number_of_heap_regions * G1DefaultMaxNewGenPercent) / 100; |
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455 return MAX2(1U, default_value); |
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456 } |
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457 |
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458 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { |
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459 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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460 |
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461 switch (_sizer_kind) { |
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462 case SizerDefaults: |
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463 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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464 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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465 break; |
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466 case SizerNewSizeOnly: |
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467 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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468 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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469 break; |
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470 case SizerMaxNewSizeOnly: |
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471 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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472 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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473 break; |
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474 case SizerMaxAndNewSize: |
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475 // Do nothing. Values set on the command line, don't update them at runtime. |
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476 break; |
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477 case SizerNewRatio: |
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478 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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479 _max_desired_young_length = _min_desired_young_length; |
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480 break; |
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481 default: |
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482 ShouldNotReachHere(); |
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483 } |
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484 |
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485 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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486 } |
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487 |
342 | 488 void G1CollectorPolicy::init() { |
489 // Set aside an initial future to_space. | |
490 _g1 = G1CollectedHeap::heap(); | |
491 | |
492 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
493 | |
545 | 494 initialize_gc_policy_counters(); |
495 | |
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496 if (adaptive_young_list_length()) { |
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497 _young_list_fixed_length = 0; |
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498 } else { |
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499 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 500 } |
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501 _free_regions_at_end_of_collection = _g1->free_regions(); |
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502 update_young_list_target_length(); |
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503 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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504 |
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505 // We may immediately start allocating regions and placing them on the |
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506 // collection set list. Initialize the per-collection set info |
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507 start_incremental_cset_building(); |
342 | 508 } |
509 | |
545 | 510 // Create the jstat counters for the policy. |
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511 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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512 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 513 } |
514 | |
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515 bool G1CollectorPolicy::predict_will_fit(uint young_length, |
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516 double base_time_ms, |
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517 uint base_free_regions, |
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518 double target_pause_time_ms) { |
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519 if (young_length >= base_free_regions) { |
342 | 520 // end condition 1: not enough space for the young regions |
521 return false; | |
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522 } |
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523 |
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524 double accum_surv_rate = accum_yg_surv_rate_pred((int) young_length - 1); |
342 | 525 size_t bytes_to_copy = |
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526 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 527 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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528 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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529 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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530 if (pause_time_ms > target_pause_time_ms) { |
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531 // end condition 2: prediction is over the target pause time |
342 | 532 return false; |
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533 } |
342 | 534 |
535 size_t free_bytes = | |
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536 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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537 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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538 // end condition 3: out-of-space (conservatively!) |
342 | 539 return false; |
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540 } |
342 | 541 |
542 // success! | |
543 return true; | |
544 } | |
545 | |
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546 void G1CollectorPolicy::record_new_heap_size(uint new_number_of_regions) { |
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547 // re-calculate the necessary reserve |
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548 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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549 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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550 // smaller than 1.0) we'll get 1. |
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551 _reserve_regions = (uint) ceil(reserve_regions_d); |
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552 |
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553 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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554 } |
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555 |
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556 uint G1CollectorPolicy::calculate_young_list_desired_min_length( |
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557 uint base_min_length) { |
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558 uint desired_min_length = 0; |
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559 if (adaptive_young_list_length()) { |
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560 if (_alloc_rate_ms_seq->num() > 3) { |
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561 double now_sec = os::elapsedTime(); |
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562 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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563 double alloc_rate_ms = predict_alloc_rate_ms(); |
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564 desired_min_length = (uint) ceil(alloc_rate_ms * when_ms); |
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565 } else { |
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566 // otherwise we don't have enough info to make the prediction |
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567 } |
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568 } |
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569 desired_min_length += base_min_length; |
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570 // make sure we don't go below any user-defined minimum bound |
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571 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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572 } |
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573 |
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574 uint G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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575 // Here, we might want to also take into account any additional |
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576 // constraints (i.e., user-defined minimum bound). Currently, we |
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577 // effectively don't set this bound. |
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578 return _young_gen_sizer->max_desired_young_length(); |
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579 } |
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580 |
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581 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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582 if (rs_lengths == (size_t) -1) { |
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583 // if it's set to the default value (-1), we should predict it; |
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584 // otherwise, use the given value. |
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585 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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586 } |
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587 |
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588 // Calculate the absolute and desired min bounds. |
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589 |
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590 // This is how many young regions we already have (currently: the survivors). |
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591 uint base_min_length = recorded_survivor_regions(); |
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592 // This is the absolute minimum young length, which ensures that we |
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593 // can allocate one eden region in the worst-case. |
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594 uint absolute_min_length = base_min_length + 1; |
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595 uint desired_min_length = |
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596 calculate_young_list_desired_min_length(base_min_length); |
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597 if (desired_min_length < absolute_min_length) { |
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598 desired_min_length = absolute_min_length; |
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599 } |
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600 |
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601 // Calculate the absolute and desired max bounds. |
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602 |
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603 // We will try our best not to "eat" into the reserve. |
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604 uint absolute_max_length = 0; |
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605 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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606 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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607 } |
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608 uint desired_max_length = calculate_young_list_desired_max_length(); |
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609 if (desired_max_length > absolute_max_length) { |
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610 desired_max_length = absolute_max_length; |
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611 } |
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612 |
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613 uint young_list_target_length = 0; |
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614 if (adaptive_young_list_length()) { |
4710 | 615 if (gcs_are_young()) { |
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616 young_list_target_length = |
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617 calculate_young_list_target_length(rs_lengths, |
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618 base_min_length, |
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619 desired_min_length, |
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620 desired_max_length); |
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621 _rs_lengths_prediction = rs_lengths; |
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622 } else { |
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623 // Don't calculate anything and let the code below bound it to |
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624 // the desired_min_length, i.e., do the next GC as soon as |
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625 // possible to maximize how many old regions we can add to it. |
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626 } |
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627 } else { |
4912
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628 // The user asked for a fixed young gen so we'll fix the young gen |
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629 // whether the next GC is young or mixed. |
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630 young_list_target_length = _young_list_fixed_length; |
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631 } |
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632 |
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633 // Make sure we don't go over the desired max length, nor under the |
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634 // desired min length. In case they clash, desired_min_length wins |
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635 // which is why that test is second. |
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636 if (young_list_target_length > desired_max_length) { |
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637 young_list_target_length = desired_max_length; |
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638 } |
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639 if (young_list_target_length < desired_min_length) { |
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640 young_list_target_length = desired_min_length; |
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641 } |
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642 |
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643 assert(young_list_target_length > recorded_survivor_regions(), |
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644 "we should be able to allocate at least one eden region"); |
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645 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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646 _young_list_target_length = young_list_target_length; |
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647 |
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648 update_max_gc_locker_expansion(); |
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649 } |
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650 |
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651 uint |
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652 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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653 uint base_min_length, |
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654 uint desired_min_length, |
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655 uint desired_max_length) { |
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656 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 657 assert(gcs_are_young(), "only call this for young GCs"); |
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658 |
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659 // In case some edge-condition makes the desired max length too small... |
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660 if (desired_max_length <= desired_min_length) { |
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661 return desired_min_length; |
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662 } |
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663 |
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664 // We'll adjust min_young_length and max_young_length not to include |
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665 // the already allocated young regions (i.e., so they reflect the |
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666 // min and max eden regions we'll allocate). The base_min_length |
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667 // will be reflected in the predictions by the |
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668 // survivor_regions_evac_time prediction. |
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669 assert(desired_min_length > base_min_length, "invariant"); |
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670 uint min_young_length = desired_min_length - base_min_length; |
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671 assert(desired_max_length > base_min_length, "invariant"); |
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672 uint max_young_length = desired_max_length - base_min_length; |
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673 |
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674 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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675 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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676 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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677 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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678 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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679 double base_time_ms = |
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680 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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681 survivor_regions_evac_time; |
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682 uint available_free_regions = _free_regions_at_end_of_collection; |
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683 uint base_free_regions = 0; |
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684 if (available_free_regions > _reserve_regions) { |
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685 base_free_regions = available_free_regions - _reserve_regions; |
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686 } |
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687 |
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688 // Here, we will make sure that the shortest young length that |
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689 // makes sense fits within the target pause time. |
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690 |
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691 if (predict_will_fit(min_young_length, base_time_ms, |
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692 base_free_regions, target_pause_time_ms)) { |
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693 // The shortest young length will fit into the target pause time; |
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694 // we'll now check whether the absolute maximum number of young |
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695 // regions will fit in the target pause time. If not, we'll do |
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696 // a binary search between min_young_length and max_young_length. |
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697 if (predict_will_fit(max_young_length, base_time_ms, |
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698 base_free_regions, target_pause_time_ms)) { |
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699 // The maximum young length will fit into the target pause time. |
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700 // We are done so set min young length to the maximum length (as |
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701 // the result is assumed to be returned in min_young_length). |
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702 min_young_length = max_young_length; |
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703 } else { |
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704 // The maximum possible number of young regions will not fit within |
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705 // the target pause time so we'll search for the optimal |
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706 // length. The loop invariants are: |
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707 // |
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708 // min_young_length < max_young_length |
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709 // min_young_length is known to fit into the target pause time |
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710 // max_young_length is known not to fit into the target pause time |
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711 // |
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712 // Going into the loop we know the above hold as we've just |
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713 // checked them. Every time around the loop we check whether |
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714 // the middle value between min_young_length and |
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715 // max_young_length fits into the target pause time. If it |
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716 // does, it becomes the new min. If it doesn't, it becomes |
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717 // the new max. This way we maintain the loop invariants. |
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718 |
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719 assert(min_young_length < max_young_length, "invariant"); |
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720 uint diff = (max_young_length - min_young_length) / 2; |
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721 while (diff > 0) { |
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722 uint young_length = min_young_length + diff; |
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723 if (predict_will_fit(young_length, base_time_ms, |
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724 base_free_regions, target_pause_time_ms)) { |
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725 min_young_length = young_length; |
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726 } else { |
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727 max_young_length = young_length; |
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728 } |
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729 assert(min_young_length < max_young_length, "invariant"); |
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730 diff = (max_young_length - min_young_length) / 2; |
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731 } |
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732 // The results is min_young_length which, according to the |
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733 // loop invariants, should fit within the target pause time. |
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734 |
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735 // These are the post-conditions of the binary search above: |
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736 assert(min_young_length < max_young_length, |
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737 "otherwise we should have discovered that max_young_length " |
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738 "fits into the pause target and not done the binary search"); |
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739 assert(predict_will_fit(min_young_length, base_time_ms, |
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740 base_free_regions, target_pause_time_ms), |
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741 "min_young_length, the result of the binary search, should " |
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742 "fit into the pause target"); |
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743 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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744 base_free_regions, target_pause_time_ms), |
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745 "min_young_length, the result of the binary search, should be " |
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746 "optimal, so no larger length should fit into the pause target"); |
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747 } |
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748 } else { |
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749 // Even the minimum length doesn't fit into the pause time |
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750 // target, return it as the result nevertheless. |
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751 } |
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752 return base_min_length + min_young_length; |
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753 } |
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754 |
545 | 755 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
756 double survivor_regions_evac_time = 0.0; | |
757 for (HeapRegion * r = _recorded_survivor_head; | |
758 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
759 r = r->get_next_young_region()) { | |
760 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
761 } | |
762 return survivor_regions_evac_time; | |
763 } | |
764 | |
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765 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 766 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
767 | |
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768 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 769 if (rs_lengths > _rs_lengths_prediction) { |
770 // add 10% to avoid having to recalculate often | |
771 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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772 update_young_list_target_length(rs_lengths_prediction); |
342 | 773 } |
774 } | |
775 | |
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776 |
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777 |
342 | 778 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
779 bool is_tlab, | |
780 bool* gc_overhead_limit_was_exceeded) { | |
781 guarantee(false, "Not using this policy feature yet."); | |
782 return NULL; | |
783 } | |
784 | |
785 // This method controls how a collector handles one or more | |
786 // of its generations being fully allocated. | |
787 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
788 bool is_tlab) { | |
789 guarantee(false, "Not using this policy feature yet."); | |
790 return NULL; | |
791 } | |
792 | |
793 | |
794 #ifndef PRODUCT | |
795 bool G1CollectorPolicy::verify_young_ages() { | |
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796 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 797 return |
798 verify_young_ages(head, _short_lived_surv_rate_group); | |
799 // also call verify_young_ages on any additional surv rate groups | |
800 } | |
801 | |
802 bool | |
803 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
804 SurvRateGroup *surv_rate_group) { | |
805 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
806 | |
807 const char* name = surv_rate_group->name(); | |
808 bool ret = true; | |
809 int prev_age = -1; | |
810 | |
811 for (HeapRegion* curr = head; | |
812 curr != NULL; | |
813 curr = curr->get_next_young_region()) { | |
814 SurvRateGroup* group = curr->surv_rate_group(); | |
815 if (group == NULL && !curr->is_survivor()) { | |
816 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
817 ret = false; | |
818 } | |
819 | |
820 if (surv_rate_group == group) { | |
821 int age = curr->age_in_surv_rate_group(); | |
822 | |
823 if (age < 0) { | |
824 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
825 ret = false; | |
826 } | |
827 | |
828 if (age <= prev_age) { | |
829 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
830 "(%d, %d)", name, age, prev_age); | |
831 ret = false; | |
832 } | |
833 prev_age = age; | |
834 } | |
835 } | |
836 | |
837 return ret; | |
838 } | |
839 #endif // PRODUCT | |
840 | |
841 void G1CollectorPolicy::record_full_collection_start() { | |
842 _cur_collection_start_sec = os::elapsedTime(); | |
843 // Release the future to-space so that it is available for compaction into. | |
844 _g1->set_full_collection(); | |
845 } | |
846 | |
847 void G1CollectorPolicy::record_full_collection_end() { | |
848 // Consider this like a collection pause for the purposes of allocation | |
849 // since last pause. | |
850 double end_sec = os::elapsedTime(); | |
851 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
852 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
853 | |
854 _all_full_gc_times_ms->add(full_gc_time_ms); | |
855 | |
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856 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 857 |
858 _g1->clear_full_collection(); | |
859 | |
4710 | 860 // "Nuke" the heuristics that control the young/mixed GC |
861 // transitions and make sure we start with young GCs after the Full GC. | |
862 set_gcs_are_young(true); | |
863 _last_young_gc = false; | |
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864 clear_initiate_conc_mark_if_possible(); |
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865 clear_during_initial_mark_pause(); |
342 | 866 _in_marking_window = false; |
867 _in_marking_window_im = false; | |
868 | |
869 _short_lived_surv_rate_group->start_adding_regions(); | |
870 // also call this on any additional surv rate groups | |
871 | |
545 | 872 record_survivor_regions(0, NULL, NULL); |
873 | |
342 | 874 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 875 // Reset survivors SurvRateGroup. |
876 _survivor_surv_rate_group->reset(); | |
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877 update_young_list_target_length(); |
6011 | 878 _collectionSetChooser->clear(); |
1973 | 879 } |
342 | 880 |
881 void G1CollectorPolicy::record_stop_world_start() { | |
882 _stop_world_start = os::elapsedTime(); | |
883 } | |
884 | |
885 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
886 size_t start_used) { | |
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887 if (G1Log::finer()) { |
342 | 888 gclog_or_tty->stamp(PrintGCTimeStamps); |
6030 | 889 gclog_or_tty->print("[GC pause (%s) (%s)", |
890 GCCause::to_string(_g1->gc_cause()), | |
891 gcs_are_young() ? "young" : "mixed"); | |
342 | 892 } |
893 | |
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894 // We only need to do this here as the policy will only be applied |
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895 // to the GC we're about to start. so, no point is calculating this |
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896 // every time we calculate / recalculate the target young length. |
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897 update_survivors_policy(); |
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898 |
1973 | 899 assert(_g1->used() == _g1->recalculate_used(), |
900 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
901 _g1->used(), _g1->recalculate_used())); | |
342 | 902 |
903 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
904 _all_stop_world_times_ms->add(s_w_t_ms); | |
905 _stop_world_start = 0.0; | |
906 | |
907 _cur_collection_start_sec = start_time_sec; | |
908 _cur_collection_pause_used_at_start_bytes = start_used; | |
909 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
910 _pending_cards = _g1->pending_card_num(); | |
911 _max_pending_cards = _g1->max_pending_card_num(); | |
912 | |
913 _bytes_in_collection_set_before_gc = 0; | |
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914 _bytes_copied_during_gc = 0; |
342 | 915 |
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916 YoungList* young_list = _g1->young_list(); |
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917 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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918 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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919 _capacity_before_gc = _g1->capacity(); |
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920 |
342 | 921 #ifdef DEBUG |
922 // initialise these to something well known so that we can spot | |
923 // if they are not set properly | |
924 | |
925 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 926 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
927 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
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928 _par_last_satb_filtering_times_ms[i] = -1234.0; |
1611 | 929 _par_last_update_rs_times_ms[i] = -1234.0; |
930 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
931 _par_last_scan_rs_times_ms[i] = -1234.0; | |
932 _par_last_obj_copy_times_ms[i] = -1234.0; | |
933 _par_last_termination_times_ms[i] = -1234.0; | |
934 _par_last_termination_attempts[i] = -1234.0; | |
935 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 936 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 937 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 938 } |
939 #endif | |
940 | |
941 for (int i = 0; i < _aux_num; ++i) { | |
942 _cur_aux_times_ms[i] = 0.0; | |
943 _cur_aux_times_set[i] = false; | |
944 } | |
945 | |
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946 // This is initialized to zero here and is set during the evacuation |
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947 // pause if we actually waited for the root region scanning to finish. |
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948 _root_region_scan_wait_time_ms = 0.0; |
342 | 949 |
4710 | 950 _last_gc_was_young = false; |
342 | 951 |
952 // do that for any other surv rate groups | |
953 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 954 _survivors_age_table.clear(); |
545 | 955 |
342 | 956 assert( verify_young_ages(), "region age verification" ); |
957 } | |
958 | |
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959 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 960 mark_init_elapsed_time_ms) { |
961 _during_marking = true; | |
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962 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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963 clear_during_initial_mark_pause(); |
342 | 964 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
965 } | |
966 | |
967 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
968 _mark_remark_start_sec = os::elapsedTime(); | |
969 _during_marking = false; | |
970 } | |
971 | |
972 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
973 double end_time_sec = os::elapsedTime(); | |
974 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
975 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
976 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
977 _prev_collection_pause_end_ms += elapsed_time_ms; | |
978 | |
979 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
980 } | |
981 | |
982 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
983 _mark_cleanup_start_sec = os::elapsedTime(); | |
984 } | |
985 | |
4013 | 986 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 987 _last_young_gc = true; |
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988 _in_marking_window = false; |
342 | 989 } |
990 | |
991 void G1CollectorPolicy::record_concurrent_pause() { | |
992 if (_stop_world_start > 0.0) { | |
993 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
994 _all_yield_times_ms->add(yield_ms); | |
995 } | |
996 } | |
997 | |
998 void G1CollectorPolicy::record_concurrent_pause_end() { | |
999 } | |
1000 | |
1001 template<class T> | |
1002 T sum_of(T* sum_arr, int start, int n, int N) { | |
1003 T sum = (T)0; | |
1004 for (int i = 0; i < n; i++) { | |
1005 int j = (start + i) % N; | |
1006 sum += sum_arr[j]; | |
1007 } | |
1008 return sum; | |
1009 } | |
1010 | |
1611 | 1011 void G1CollectorPolicy::print_par_stats(int level, |
1012 const char* str, | |
2430 | 1013 double* data) { |
342 | 1014 double min = data[0], max = data[0]; |
1015 double total = 0.0; | |
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1016 LineBuffer buf(level); |
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1017 buf.append("[%s (ms):", str); |
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1018 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1019 double val = data[i]; |
1020 if (val < min) | |
1021 min = val; | |
1022 if (val > max) | |
1023 max = val; | |
1024 total += val; | |
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1025 if (G1Log::finest()) { |
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1026 buf.append(" %.1lf", val); |
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1027 } |
342 | 1028 } |
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1029 |
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1030 if (G1Log::finest()) { |
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1031 buf.append_and_print_cr(""); |
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1032 } |
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1033 double avg = total / (double) no_of_gc_threads(); |
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1034 buf.append_and_print_cr(" Avg: %.1lf Min: %.1lf Max: %.1lf Diff: %.1lf]", |
2430 | 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 | |
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1124 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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1125 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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1126 return false; |
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1127 } |
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1128 |
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1129 size_t marking_initiating_used_threshold = |
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1130 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1131 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
4834
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1132 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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1133 |
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1134 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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1135 if (gcs_are_young()) { |
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1136 ergo_verbose5(ErgoConcCycles, |
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1137 "request concurrent cycle initiation", |
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1138 ergo_format_reason("occupancy higher than threshold") |
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1139 ergo_format_byte("occupancy") |
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1140 ergo_format_byte("allocation request") |
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1141 ergo_format_byte_perc("threshold") |
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1142 ergo_format_str("source"), |
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1143 cur_used_bytes, |
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1144 alloc_byte_size, |
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1145 marking_initiating_used_threshold, |
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1146 (double) InitiatingHeapOccupancyPercent, |
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1147 source); |
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1148 return true; |
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1149 } else { |
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1150 ergo_verbose5(ErgoConcCycles, |
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1151 "do not request concurrent cycle initiation", |
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1152 ergo_format_reason("still doing mixed collections") |
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1153 ergo_format_byte("occupancy") |
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1154 ergo_format_byte("allocation request") |
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1155 ergo_format_byte_perc("threshold") |
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1156 ergo_format_str("source"), |
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1157 cur_used_bytes, |
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1158 alloc_byte_size, |
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1159 marking_initiating_used_threshold, |
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1160 (double) InitiatingHeapOccupancyPercent, |
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1161 source); |
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1162 } |
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1163 } |
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1164 |
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1165 return false; |
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1166 } |
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1167 |
342 | 1168 // Anything below that is considered to be zero |
1169 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1170 | |
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1171 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1172 double end_time_sec = os::elapsedTime(); |
1173 double elapsed_ms = _last_pause_time_ms; | |
1833
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1174 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
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1175 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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1176 "otherwise, the subtraction below does not make sense"); |
342 | 1177 size_t rs_size = |
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1178 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1179 size_t cur_used_bytes = _g1->used(); |
1180 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1181 bool last_pause_included_initial_mark = false; | |
1707 | 1182 bool update_stats = !_g1->evacuation_failed(); |
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1183 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1184 |
1185 #ifndef PRODUCT | |
1186 if (G1YoungSurvRateVerbose) { | |
1187 gclog_or_tty->print_cr(""); | |
1188 _short_lived_surv_rate_group->print(); | |
1189 // do that for any other surv rate groups too | |
1190 } | |
1191 #endif // PRODUCT | |
1192 | |
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1193 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1194 if (last_pause_included_initial_mark) { |
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1195 record_concurrent_mark_init_end(0.0); |
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1196 } else if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
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1197 // Note: this might have already been set, if during the last |
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1198 // pause we decided to start a cycle but at the beginning of |
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1199 // this pause we decided to postpone it. That's OK. |
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1200 set_initiate_conc_mark_if_possible(); |
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1201 } |
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1202 |
342 | 1203 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1204 end_time_sec, false); | |
1205 | |
1206 // This assert is exempted when we're doing parallel collection pauses, | |
1207 // because the fragmentation caused by the parallel GC allocation buffers | |
1208 // can lead to more memory being used during collection than was used | |
1209 // before. Best leave this out until the fragmentation problem is fixed. | |
1210 // Pauses in which evacuation failed can also lead to negative | |
1211 // collections, since no space is reclaimed from a region containing an | |
1212 // object whose evacuation failed. | |
1213 // Further, we're now always doing parallel collection. But I'm still | |
1214 // leaving this here as a placeholder for a more precise assertion later. | |
1215 // (DLD, 10/05.) | |
1216 assert((true || parallel) // Always using GC LABs now. | |
1217 || _g1->evacuation_failed() | |
1218 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1219 "Negative collection"); | |
1220 | |
1221 size_t freed_bytes = | |
1222 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1223 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
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1224 |
342 | 1225 double survival_fraction = |
1226 (double)surviving_bytes/ | |
1227 (double)_collection_set_bytes_used_before; | |
1228 | |
4023 | 1229 // These values are used to update the summary information that is |
1230 // displayed when TraceGen0Time is enabled, and are output as part | |
6007
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7160728: Introduce an extra logging level for G1 logging
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1231 // of the "finer" output, in the non-parallel case. |
4023 | 1232 |
3823
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1233 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1234 double satb_filtering_time = avg_value(_par_last_satb_filtering_times_ms); |
3823
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1235 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1236 double update_rs_processed_buffers = |
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1237 sum_of_values(_par_last_update_rs_processed_buffers); |
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1238 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1239 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1240 double termination_time = avg_value(_par_last_termination_times_ms); |
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1241 |
4023 | 1242 double known_time = ext_root_scan_time + |
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1243 satb_filtering_time + |
4023 | 1244 update_rs_time + |
1245 scan_rs_time + | |
1246 obj_copy_time; | |
1247 | |
1248 double other_time_ms = elapsed_ms; | |
1249 | |
4837
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1250 // Subtract the root region scanning wait time. It's initialized to |
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1251 // zero at the start of the pause. |
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1252 other_time_ms -= _root_region_scan_wait_time_ms; |
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1253 |
4023 | 1254 if (parallel) { |
1255 other_time_ms -= _cur_collection_par_time_ms; | |
1256 } else { | |
1257 other_time_ms -= known_time; | |
1258 } | |
1259 | |
5986
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1260 // Now subtract the time taken to fix up roots in generated code |
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1261 other_time_ms -= _cur_collection_code_root_fixup_time_ms; |
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|
1262 |
4023 | 1263 // Subtract the time taken to clean the card table from the |
1264 // current value of "other time" | |
1265 other_time_ms -= _cur_clear_ct_time_ms; | |
1266 | |
1267 // TraceGen0Time and TraceGen1Time summary info updating. | |
1268 _all_pause_times_ms->add(elapsed_ms); | |
3823
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1269 |
595
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|
1270 if (update_stats) { |
4023 | 1271 _summary->record_total_time_ms(elapsed_ms); |
1272 _summary->record_other_time_ms(other_time_ms); | |
1273 | |
1274 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1275 assert(body_summary != NULL, "should not be null!"); | |
1276 | |
4837
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1277 body_summary->record_root_region_scan_wait_time_ms( |
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|
1278 _root_region_scan_wait_time_ms); |
3823
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|
1279 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1280 body_summary->record_satb_filtering_time_ms(satb_filtering_time); |
3823
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|
1281 body_summary->record_update_rs_time_ms(update_rs_time); |
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|
1282 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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|
1283 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1284 |
3823
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|
1285 if (parallel) { |
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|
1286 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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|
1287 body_summary->record_termination_time_ms(termination_time); |
4023 | 1288 |
1289 double parallel_known_time = known_time + termination_time; | |
1290 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
3823
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|
1291 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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|
1292 } |
4023 | 1293 |
1294 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
3823
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|
1295 |
342 | 1296 // We exempt parallel collection from this check because Alloc Buffer |
1297 // fragmentation can produce negative collections. Same with evac | |
1298 // failure. | |
1299 // Further, we're now always doing parallel collection. But I'm still | |
1300 // leaving this here as a placeholder for a more precise assertion later. | |
1301 // (DLD, 10/05. | |
1302 assert((true || parallel) | |
1303 || _g1->evacuation_failed() | |
1304 || surviving_bytes <= _collection_set_bytes_used_before, | |
1305 "Or else negative collection!"); | |
4023 | 1306 |
342 | 1307 // this is where we update the allocation rate of the application |
1308 double app_time_ms = | |
1309 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1310 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1311 // This usually happens due to the timer not having the required | |
1312 // granularity. Some Linuxes are the usual culprits. | |
1313 // We'll just set it to something (arbitrarily) small. | |
1314 app_time_ms = 1.0; | |
1315 } | |
4090
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1316 // We maintain the invariant that all objects allocated by mutator |
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1317 // threads will be allocated out of eden regions. So, we can use |
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1318 // the eden region number allocated since the previous GC to |
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1319 // calculate the application's allocate rate. The only exception |
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1320 // to that is humongous objects that are allocated separately. But |
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1321 // given that humongous object allocations do not really affect |
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1322 // either the pause's duration nor when the next pause will take |
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1323 // place we can safely ignore them here. |
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1324 uint regions_allocated = eden_cset_region_length(); |
342 | 1325 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
1326 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1327 | |
1328 double interval_ms = | |
1329 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1330 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1331 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1332 if (recent_avg_pause_time_ratio() < 0.0 || |
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1333 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1334 #ifndef PRODUCT |
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1335 // Dump info to allow post-facto debugging |
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1336 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1337 gclog_or_tty->print_cr("-------------------------------------------"); |
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1338 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1339 _recent_gc_times_ms->dump(); |
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1340 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1341 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1342 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1343 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1344 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1345 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1346 #endif // !PRODUCT |
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1347 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1348 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
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1349 if (_recent_avg_pause_time_ratio < 0.0) { |
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1350 _recent_avg_pause_time_ratio = 0.0; |
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1351 } else { |
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1352 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1353 _recent_avg_pause_time_ratio = 1.0; |
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1354 } |
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1355 } |
342 | 1356 } |
1357 | |
4023 | 1358 for (int i = 0; i < _aux_num; ++i) { |
1359 if (_cur_aux_times_set[i]) { | |
1360 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1361 } | |
1362 } | |
1363 | |
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1364 if (G1Log::finer()) { |
4023 | 1365 bool print_marking_info = |
1366 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1367 | |
1707 | 1368 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1369 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1370 elapsed_ms / 1000.0); | |
1371 | |
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1372 if (_root_region_scan_wait_time_ms > 0.0) { |
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1373 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms); |
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1374 } |
1707 | 1375 if (parallel) { |
1376 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1377 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1378 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1379 if (print_marking_info) { | |
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1380 print_par_stats(2, "SATB Filtering", _par_last_satb_filtering_times_ms); |
4023 | 1381 } |
1707 | 1382 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
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1383 if (G1Log::finest()) { |
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1384 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
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1385 } |
1707 | 1386 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1387 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1388 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
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1389 if (G1Log::finest()) { |
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1390 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
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1391 } |
2430 | 1392 |
1393 for (int i = 0; i < _parallel_gc_threads; i++) { | |
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1394 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - |
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1395 _par_last_gc_worker_start_times_ms[i]; |
4023 | 1396 |
1397 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
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1398 _par_last_satb_filtering_times_ms[i] + |
4023 | 1399 _par_last_update_rs_times_ms[i] + |
1400 _par_last_scan_rs_times_ms[i] + | |
1401 _par_last_obj_copy_times_ms[i] + | |
1402 _par_last_termination_times_ms[i]; | |
1403 | |
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1404 _par_last_gc_worker_other_times_ms[i] = _par_last_gc_worker_times_ms[i] - |
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1405 worker_known_time; |
2430 | 1406 } |
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1407 |
4023 | 1408 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); |
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1409 print_par_stats(2, "GC Worker Total", _par_last_gc_worker_times_ms); |
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1410 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
1707 | 1411 } else { |
4023 | 1412 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1413 if (print_marking_info) { | |
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1414 print_stats(1, "SATB Filtering", satb_filtering_time); |
4023 | 1415 } |
1707 | 1416 print_stats(1, "Update RS", update_rs_time); |
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1417 if (G1Log::finest()) { |
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1418 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
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1419 } |
1707 | 1420 print_stats(1, "Scan RS", scan_rs_time); |
1421 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1422 } |
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1423 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms); |
4023 | 1424 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
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1425 #ifndef PRODUCT |
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1426 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1427 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1428 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1429 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1430 if (_num_cc_clears > 0) { |
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|
1431 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1432 } |
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1433 #endif |
342 | 1434 print_stats(1, "Other", other_time_ms); |
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1435 print_stats(2, "Choose CSet", |
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1436 (_recorded_young_cset_choice_time_ms + |
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1437 _recorded_non_young_cset_choice_time_ms)); |
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1438 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1439 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1440 print_stats(2, "Free CSet", |
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1441 (_recorded_young_free_cset_time_ms + |
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1442 _recorded_non_young_free_cset_time_ms)); |
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1443 |
342 | 1444 for (int i = 0; i < _aux_num; ++i) { |
1445 if (_cur_aux_times_set[i]) { | |
1446 char buffer[96]; | |
1447 sprintf(buffer, "Aux%d", i); | |
1448 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1449 } | |
1450 } | |
1451 } | |
1452 | |
1453 bool new_in_marking_window = _in_marking_window; | |
1454 bool new_in_marking_window_im = false; | |
1359
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1455 if (during_initial_mark_pause()) { |
342 | 1456 new_in_marking_window = true; |
1457 new_in_marking_window_im = true; | |
1458 } | |
1459 | |
4710 | 1460 if (_last_young_gc) { |
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1461 // This is supposed to to be the "last young GC" before we start |
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1462 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1463 |
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1464 if (!last_pause_included_initial_mark) { |
4912
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1465 if (next_gc_should_be_mixed("start mixed GCs", |
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1466 "do not start mixed GCs")) { |
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1467 set_gcs_are_young(false); |
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1468 } |
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1469 } else { |
4710 | 1470 ergo_verbose0(ErgoMixedGCs, |
1471 "do not start mixed GCs", | |
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1472 ergo_format_reason("concurrent cycle is about to start")); |
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1473 } |
4710 | 1474 _last_young_gc = false; |
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1475 } |
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1476 |
4710 | 1477 if (!_last_gc_was_young) { |
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1478 // This is a mixed GC. Here we decide whether to continue doing |
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1479 // mixed GCs or not. |
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1480 |
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1481 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1482 "do not continue mixed GCs")) { |
4710 | 1483 set_gcs_are_young(true); |
342 | 1484 } |
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1485 } |
4710 | 1486 |
342 | 1487 _short_lived_surv_rate_group->start_adding_regions(); |
1488 // do that for any other surv rate groupsx | |
1489 | |
677 | 1490 if (update_stats) { |
342 | 1491 double pause_time_ms = elapsed_ms; |
1492 | |
1493 size_t diff = 0; | |
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1494 if (_max_pending_cards >= _pending_cards) { |
342 | 1495 diff = _max_pending_cards - _pending_cards; |
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1496 } |
342 | 1497 _pending_card_diff_seq->add((double) diff); |
1498 | |
1499 double cost_per_card_ms = 0.0; | |
1500 if (_pending_cards > 0) { | |
1501 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1502 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1503 } | |
1504 | |
1505 size_t cards_scanned = _g1->cards_scanned(); | |
1506 | |
1507 double cost_per_entry_ms = 0.0; | |
1508 if (cards_scanned > 10) { | |
1509 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
4710 | 1510 if (_last_gc_was_young) { |
342 | 1511 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1512 } else { |
1513 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1514 } | |
342 | 1515 } |
1516 | |
1517 if (_max_rs_lengths > 0) { | |
1518 double cards_per_entry_ratio = | |
1519 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1520 if (_last_gc_was_young) { |
1521 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1522 } else { | |
1523 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1524 } | |
342 | 1525 } |
1526 | |
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1527 // This is defensive. For a while _max_rs_lengths could get |
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1528 // smaller than _recorded_rs_lengths which was causing |
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1529 // rs_length_diff to get very large and mess up the RSet length |
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1530 // predictions. The reason was unsafe concurrent updates to the |
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1531 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1532 // against (see CR 7118202). This bug has now been fixed (see CR |
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1533 // 7119027). However, I'm still worried that |
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1534 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1535 // inaccurate. The concurrent refinement thread calculates an |
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1536 // RSet's length concurrently with other CR threads updating it |
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1537 // which might cause it to calculate the length incorrectly (if, |
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1538 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1539 // conditional below just in case. |
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1540 size_t rs_length_diff = 0; |
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1541 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1542 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1543 } |
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1544 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1545 |
1546 size_t copied_bytes = surviving_bytes; | |
1547 double cost_per_byte_ms = 0.0; | |
1548 if (copied_bytes > 0) { | |
1549 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
4710 | 1550 if (_in_marking_window) { |
342 | 1551 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1552 } else { |
342 | 1553 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1554 } |
342 | 1555 } |
1556 | |
1557 double all_other_time_ms = pause_time_ms - | |
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1558 (update_rs_time + scan_rs_time + obj_copy_time + termination_time); |
342 | 1559 |
1560 double young_other_time_ms = 0.0; | |
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1561 if (young_cset_region_length() > 0) { |
342 | 1562 young_other_time_ms = |
1563 _recorded_young_cset_choice_time_ms + | |
1564 _recorded_young_free_cset_time_ms; | |
1565 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1566 (double) young_cset_region_length()); |
342 | 1567 } |
1568 double non_young_other_time_ms = 0.0; | |
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1569 if (old_cset_region_length() > 0) { |
342 | 1570 non_young_other_time_ms = |
1571 _recorded_non_young_cset_choice_time_ms + | |
1572 _recorded_non_young_free_cset_time_ms; | |
1573 | |
1574 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1575 (double) old_cset_region_length()); |
342 | 1576 } |
1577 | |
1578 double constant_other_time_ms = all_other_time_ms - | |
1579 (young_other_time_ms + non_young_other_time_ms); | |
1580 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1581 | |
1582 double survival_ratio = 0.0; | |
1583 if (_bytes_in_collection_set_before_gc > 0) { | |
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1584 survival_ratio = (double) _bytes_copied_during_gc / |
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1585 (double) _bytes_in_collection_set_before_gc; |
342 | 1586 } |
1587 | |
1588 _pending_cards_seq->add((double) _pending_cards); | |
1589 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1590 } | |
1591 | |
1592 _in_marking_window = new_in_marking_window; | |
1593 _in_marking_window_im = new_in_marking_window_im; | |
1594 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1595 update_young_list_target_length(); |
342 | 1596 |
1111 | 1597 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1598 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1599 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1600 |
6011 | 1601 _collectionSetChooser->verify(); |
342 | 1602 } |
1603 | |
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1604 #define EXT_SIZE_FORMAT "%d%s" |
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1605 #define EXT_SIZE_PARAMS(bytes) \ |
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1606 byte_size_in_proper_unit((bytes)), \ |
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1607 proper_unit_for_byte_size((bytes)) |
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1608 |
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1609 void G1CollectorPolicy::print_heap_transition() { |
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1610 if (G1Log::finer()) { |
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1611 YoungList* young_list = _g1->young_list(); |
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1612 size_t eden_bytes = young_list->eden_used_bytes(); |
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1613 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1614 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1615 size_t used = _g1->used(); |
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1616 size_t capacity = _g1->capacity(); |
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1617 size_t eden_capacity = |
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1618 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1619 |
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1620 gclog_or_tty->print_cr( |
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1621 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1622 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1623 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1624 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1625 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1626 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1627 EXT_SIZE_PARAMS(eden_bytes), |
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1628 EXT_SIZE_PARAMS(eden_capacity), |
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1629 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1630 EXT_SIZE_PARAMS(survivor_bytes), |
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1631 EXT_SIZE_PARAMS(used_before_gc), |
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1632 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1633 EXT_SIZE_PARAMS(used), |
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1634 EXT_SIZE_PARAMS(capacity)); |
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1635 |
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1636 _prev_eden_capacity = eden_capacity; |
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1637 } else if (G1Log::fine()) { |
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1638 _g1->print_size_transition(gclog_or_tty, |
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1639 _cur_collection_pause_used_at_start_bytes, |
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1640 _g1->used(), _g1->capacity()); |
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1641 } |
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1642 } |
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1643 |
1111 | 1644 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1645 double update_rs_processed_buffers, | |
1646 double goal_ms) { | |
1647 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1648 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1649 | |
1282 | 1650 if (G1UseAdaptiveConcRefinement) { |
1111 | 1651 const int k_gy = 3, k_gr = 6; |
1652 const double inc_k = 1.1, dec_k = 0.9; | |
1653 | |
1654 int g = cg1r->green_zone(); | |
1655 if (update_rs_time > goal_ms) { | |
1656 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1657 } else { | |
1658 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1659 g = (int)MAX2(g * inc_k, g + 1.0); | |
1660 } | |
1661 } | |
1662 // Change the refinement threads params | |
1663 cg1r->set_green_zone(g); | |
1664 cg1r->set_yellow_zone(g * k_gy); | |
1665 cg1r->set_red_zone(g * k_gr); | |
1666 cg1r->reinitialize_threads(); | |
1667 | |
1668 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1669 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1670 cg1r->yellow_zone()); | |
1671 // Change the barrier params | |
1672 dcqs.set_process_completed_threshold(processing_threshold); | |
1673 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1674 } | |
1675 | |
1676 int curr_queue_size = dcqs.completed_buffers_num(); | |
1677 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1678 dcqs.set_completed_queue_padding(curr_queue_size); | |
1679 } else { | |
1680 dcqs.set_completed_queue_padding(0); | |
1681 } | |
1682 dcqs.notify_if_necessary(); | |
1683 } | |
1684 | |
342 | 1685 double |
1686 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1687 size_t rs_length = predict_rs_length_diff(); | |
1688 size_t card_num; | |
4710 | 1689 if (gcs_are_young()) { |
342 | 1690 card_num = predict_young_card_num(rs_length); |
4710 | 1691 } else { |
342 | 1692 card_num = predict_non_young_card_num(rs_length); |
4710 | 1693 } |
342 | 1694 return predict_base_elapsed_time_ms(pending_cards, card_num); |
1695 } | |
1696 | |
1697 double | |
1698 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1699 size_t scanned_cards) { | |
1700 return | |
1701 predict_rs_update_time_ms(pending_cards) + | |
1702 predict_rs_scan_time_ms(scanned_cards) + | |
1703 predict_constant_other_time_ms(); | |
1704 } | |
1705 | |
1706 double | |
1707 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1708 bool young) { | |
1709 size_t rs_length = hr->rem_set()->occupied(); | |
1710 size_t card_num; | |
4710 | 1711 if (gcs_are_young()) { |
342 | 1712 card_num = predict_young_card_num(rs_length); |
4710 | 1713 } else { |
342 | 1714 card_num = predict_non_young_card_num(rs_length); |
4710 | 1715 } |
342 | 1716 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1717 | |
1718 double region_elapsed_time_ms = | |
1719 predict_rs_scan_time_ms(card_num) + | |
1720 predict_object_copy_time_ms(bytes_to_copy); | |
1721 | |
1722 if (young) | |
1723 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1724 else | |
1725 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1726 | |
1727 return region_elapsed_time_ms; | |
1728 } | |
1729 | |
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1730 size_t G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
342 | 1731 size_t bytes_to_copy; |
1732 if (hr->is_marked()) | |
1733 bytes_to_copy = hr->max_live_bytes(); | |
1734 else { | |
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1735 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1736 int age = hr->age_in_surv_rate_group(); |
545 | 1737 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1738 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1739 } | |
1740 return bytes_to_copy; | |
1741 } | |
1742 | |
1743 void | |
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1744 G1CollectorPolicy::init_cset_region_lengths(uint eden_cset_region_length, |
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1745 uint survivor_cset_region_length) { |
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1746 _eden_cset_region_length = eden_cset_region_length; |
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1747 _survivor_cset_region_length = survivor_cset_region_length; |
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1748 _old_cset_region_length = 0; |
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1749 } |
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1750 |
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1751 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1752 _recorded_rs_lengths = rs_lengths; |
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1753 } |
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1754 |
342 | 1755 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1756 double elapsed_ms) { | |
1757 _recent_gc_times_ms->add(elapsed_ms); | |
1758 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1759 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1760 } | |
1761 | |
1762 size_t G1CollectorPolicy::expansion_amount() { | |
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1763 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1764 double threshold = _gc_overhead_perc; |
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1765 if (recent_gc_overhead > threshold) { |
751 | 1766 // We will double the existing space, or take |
1767 // G1ExpandByPercentOfAvailable % of the available expansion | |
1768 // space, whichever is smaller, bounded below by a minimum | |
1769 // expansion (unless that's all that's left.) | |
342 | 1770 const size_t min_expand_bytes = 1*M; |
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1771 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1772 size_t committed_bytes = _g1->capacity(); |
1773 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1774 size_t expand_bytes; | |
1775 size_t expand_bytes_via_pct = | |
751 | 1776 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1777 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1778 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1779 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1780 |
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1781 ergo_verbose5(ErgoHeapSizing, |
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1782 "attempt heap expansion", |
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1783 ergo_format_reason("recent GC overhead higher than " |
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1784 "threshold after GC") |
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1785 ergo_format_perc("recent GC overhead") |
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1786 ergo_format_perc("threshold") |
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1787 ergo_format_byte("uncommitted") |
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1788 ergo_format_byte_perc("calculated expansion amount"), |
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1789 recent_gc_overhead, threshold, |
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1790 uncommitted_bytes, |
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1791 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1792 |
342 | 1793 return expand_bytes; |
1794 } else { | |
1795 return 0; | |
1796 } | |
1797 } | |
1798 | |
1799 class CountCSClosure: public HeapRegionClosure { | |
1800 G1CollectorPolicy* _g1_policy; | |
1801 public: | |
1802 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1803 _g1_policy(g1_policy) {} | |
1804 bool doHeapRegion(HeapRegion* r) { | |
1805 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1806 return false; | |
1807 } | |
1808 }; | |
1809 | |
1810 void G1CollectorPolicy::count_CS_bytes_used() { | |
1811 CountCSClosure cs_closure(this); | |
1812 _g1->collection_set_iterate(&cs_closure); | |
1813 } | |
1814 | |
4023 | 1815 void G1CollectorPolicy::print_summary(int level, |
1816 const char* str, | |
1817 NumberSeq* seq) const { | |
342 | 1818 double sum = seq->sum(); |
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1819 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1820 str, sum / 1000.0, seq->avg()); |
1821 } | |
1822 | |
4023 | 1823 void G1CollectorPolicy::print_summary_sd(int level, |
1824 const char* str, | |
1825 NumberSeq* seq) const { | |
342 | 1826 print_summary(level, str, seq); |
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1827 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1828 seq->num(), seq->sd(), seq->maximum()); |
1829 } | |
1830 | |
1831 void G1CollectorPolicy::check_other_times(int level, | |
1832 NumberSeq* other_times_ms, | |
1833 NumberSeq* calc_other_times_ms) const { | |
1834 bool should_print = false; | |
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1835 LineBuffer buf(level + 2); |
342 | 1836 |
1837 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1838 fabs(calc_other_times_ms->sum())); | |
1839 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1840 fabs(calc_other_times_ms->sum())); | |
1841 double sum_ratio = max_sum / min_sum; | |
1842 if (sum_ratio > 1.1) { | |
1843 should_print = true; | |
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1844 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1845 } |
1846 | |
1847 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1848 fabs(calc_other_times_ms->avg())); | |
1849 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1850 fabs(calc_other_times_ms->avg())); | |
1851 double avg_ratio = max_avg / min_avg; | |
1852 if (avg_ratio > 1.1) { | |
1853 should_print = true; | |
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1854 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1855 } |
1856 | |
1857 if (other_times_ms->sum() < -0.01) { | |
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1858 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1859 } |
1860 | |
1861 if (other_times_ms->avg() < -0.01) { | |
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1862 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1863 } |
1864 | |
1865 if (calc_other_times_ms->sum() < -0.01) { | |
1866 should_print = true; | |
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1867 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1868 } |
1869 | |
1870 if (calc_other_times_ms->avg() < -0.01) { | |
1871 should_print = true; | |
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1872 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1873 } |
1874 | |
1875 if (should_print) | |
1876 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1877 } | |
1878 | |
1879 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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1880 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1881 MainBodySummary* body_summary = summary->main_body_summary(); |
1882 if (summary->get_total_seq()->num() > 0) { | |
677 | 1883 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1884 if (body_summary != NULL) { |
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1885 print_summary(1, "Root Region Scan Wait", body_summary->get_root_region_scan_wait_seq()); |
342 | 1886 if (parallel) { |
1887 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 1888 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1889 print_summary(2, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1890 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
1891 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
1892 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
1893 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 1894 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 1895 { |
1896 NumberSeq* other_parts[] = { | |
1897 body_summary->get_ext_root_scan_seq(), | |
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1898 body_summary->get_satb_filtering_seq(), |
4023 | 1899 body_summary->get_update_rs_seq(), |
342 | 1900 body_summary->get_scan_rs_seq(), |
1901 body_summary->get_obj_copy_seq(), | |
1902 body_summary->get_termination_seq() | |
1903 }; | |
1904 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 1905 6, other_parts); |
342 | 1906 check_other_times(2, body_summary->get_parallel_other_seq(), |
1907 &calc_other_times_ms); | |
1908 } | |
1909 } else { | |
4023 | 1910 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1911 print_summary(1, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1912 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
1913 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
1914 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
1915 } | |
1916 } | |
4023 | 1917 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); |
342 | 1918 print_summary(1, "Other", summary->get_other_seq()); |
1919 { | |
1779 | 1920 if (body_summary != NULL) { |
1921 NumberSeq calc_other_times_ms; | |
1922 if (parallel) { | |
1923 // parallel | |
1924 NumberSeq* other_parts[] = { | |
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1925 body_summary->get_root_region_scan_wait_seq(), |
1779 | 1926 body_summary->get_parallel_seq(), |
1927 body_summary->get_clear_ct_seq() | |
1928 }; | |
1929 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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1930 3, other_parts); |
1779 | 1931 } else { |
1932 // serial | |
1933 NumberSeq* other_parts[] = { | |
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1934 body_summary->get_root_region_scan_wait_seq(), |
1779 | 1935 body_summary->get_update_rs_seq(), |
1936 body_summary->get_ext_root_scan_seq(), | |
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1937 body_summary->get_satb_filtering_seq(), |
1779 | 1938 body_summary->get_scan_rs_seq(), |
1939 body_summary->get_obj_copy_seq() | |
1940 }; | |
1941 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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1942 6, other_parts); |
1779 | 1943 } |
1944 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 1945 } |
1946 } | |
1947 } else { | |
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1948 LineBuffer(1).append_and_print_cr("none"); |
342 | 1949 } |
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1950 LineBuffer(0).append_and_print_cr(""); |
342 | 1951 } |
1952 | |
1953 void G1CollectorPolicy::print_tracing_info() const { | |
1954 if (TraceGen0Time) { | |
1955 gclog_or_tty->print_cr("ALL PAUSES"); | |
1956 print_summary_sd(0, "Total", _all_pause_times_ms); | |
1957 gclog_or_tty->print_cr(""); | |
1958 gclog_or_tty->print_cr(""); | |
4710 | 1959 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
1960 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); | |
342 | 1961 gclog_or_tty->print_cr(""); |
1962 | |
677 | 1963 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
1964 print_summary(_summary); | |
342 | 1965 |
1966 gclog_or_tty->print_cr("MISC"); | |
1967 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
1968 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
1969 for (int i = 0; i < _aux_num; ++i) { | |
1970 if (_all_aux_times_ms[i].num() > 0) { | |
1971 char buffer[96]; | |
1972 sprintf(buffer, "Aux%d", i); | |
1973 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
1974 } | |
1975 } | |
1976 } | |
1977 if (TraceGen1Time) { | |
1978 if (_all_full_gc_times_ms->num() > 0) { | |
1979 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
1980 _all_full_gc_times_ms->num(), | |
1981 _all_full_gc_times_ms->sum() / 1000.0); | |
1982 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
1983 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
1984 _all_full_gc_times_ms->sd(), | |
1985 _all_full_gc_times_ms->maximum()); | |
1986 } | |
1987 } | |
1988 } | |
1989 | |
1990 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
1991 #ifndef PRODUCT | |
1992 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
1993 // add this call for any other surv rate groups | |
1994 #endif // PRODUCT | |
1995 } | |
1996 | |
1997 #ifndef PRODUCT | |
1998 // for debugging, bit of a hack... | |
1999 static char* | |
2000 region_num_to_mbs(int length) { | |
2001 static char buffer[64]; | |
2002 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2003 double mbs = bytes / (double) (1024 * 1024); | |
2004 sprintf(buffer, "%7.2lfMB", mbs); | |
2005 return buffer; | |
2006 } | |
2007 #endif // PRODUCT | |
2008 | |
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2009 uint G1CollectorPolicy::max_regions(int purpose) { |
342 | 2010 switch (purpose) { |
2011 case GCAllocForSurvived: | |
545 | 2012 return _max_survivor_regions; |
342 | 2013 case GCAllocForTenured: |
545 | 2014 return REGIONS_UNLIMITED; |
342 | 2015 default: |
545 | 2016 ShouldNotReachHere(); |
2017 return REGIONS_UNLIMITED; | |
342 | 2018 }; |
2019 } | |
2020 | |
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2021 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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2022 uint expansion_region_num = 0; |
1991
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2023 if (GCLockerEdenExpansionPercent > 0) { |
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2024 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2025 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2026 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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|
2027 // less than 1.0) we'll get 1. |
6010
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2028 expansion_region_num = (uint) ceil(expansion_region_num_d); |
1991
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|
2029 } else { |
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|
2030 assert(expansion_region_num == 0, "sanity"); |
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|
2031 } |
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|
2032 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2033 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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|
2034 } |
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2035 |
545 | 2036 // Calculates survivor space parameters. |
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2037 void G1CollectorPolicy::update_survivors_policy() { |
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2038 double max_survivor_regions_d = |
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2039 (double) _young_list_target_length / (double) SurvivorRatio; |
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2040 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2041 // smaller than 1.0) we'll get 1. |
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2042 _max_survivor_regions = (uint) ceil(max_survivor_regions_d); |
3919
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|
2043 |
3868
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|
2044 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2045 HeapRegion::GrainWords * _max_survivor_regions); |
2046 } | |
2047 | |
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2048 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2049 GCCause::Cause gc_cause) { |
1656
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2050 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2051 if (!during_cycle) { |
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2052 ergo_verbose1(ErgoConcCycles, |
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2053 "request concurrent cycle initiation", |
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2054 ergo_format_reason("requested by GC cause") |
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|
2055 ergo_format_str("GC cause"), |
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|
2056 GCCause::to_string(gc_cause)); |
1656
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|
2057 set_initiate_conc_mark_if_possible(); |
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|
2058 return true; |
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|
2059 } else { |
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2060 ergo_verbose1(ErgoConcCycles, |
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2061 "do not request concurrent cycle initiation", |
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2062 ergo_format_reason("concurrent cycle already in progress") |
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|
2063 ergo_format_str("GC cause"), |
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|
2064 GCCause::to_string(gc_cause)); |
1656
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|
2065 return false; |
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|
2066 } |
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|
2067 } |
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|
2068 |
342 | 2069 void |
1359
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|
2070 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2071 // We are about to decide on whether this pause will be an |
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|
2072 // initial-mark pause. |
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|
2073 |
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|
2074 // First, during_initial_mark_pause() should not be already set. We |
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|
2075 // will set it here if we have to. However, it should be cleared by |
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|
2076 // the end of the pause (it's only set for the duration of an |
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|
2077 // initial-mark pause). |
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|
2078 assert(!during_initial_mark_pause(), "pre-condition"); |
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|
2079 |
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|
2080 if (initiate_conc_mark_if_possible()) { |
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|
2081 // We had noticed on a previous pause that the heap occupancy has |
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|
2082 // gone over the initiating threshold and we should start a |
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|
2083 // concurrent marking cycle. So we might initiate one. |
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|
2084 |
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|
2085 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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|
2086 if (!during_cycle) { |
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|
2087 // The concurrent marking thread is not "during a cycle", i.e., |
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|
2088 // it has completed the last one. So we can go ahead and |
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|
2089 // initiate a new cycle. |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2090 |
23b1b27ac76c
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|
2091 set_during_initial_mark_pause(); |
4710 | 2092 // We do not allow mixed GCs during marking. |
2093 if (!gcs_are_young()) { | |
2094 set_gcs_are_young(true); | |
2095 ergo_verbose0(ErgoMixedGCs, | |
2096 "end mixed GCs", | |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
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3979
diff
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|
2097 ergo_format_reason("concurrent cycle is about to start")); |
273b46400613
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3979
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|
2098 } |
1359
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|
2099 |
23b1b27ac76c
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|
2100 // And we can now clear initiate_conc_mark_if_possible() as |
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|
2101 // we've already acted on it. |
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|
2102 clear_initiate_conc_mark_if_possible(); |
3914
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|
2103 |
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|
2104 ergo_verbose0(ErgoConcCycles, |
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|
2105 "initiate concurrent cycle", |
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|
2106 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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|
2107 } else { |
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|
2108 // The concurrent marking thread is still finishing up the |
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|
2109 // previous cycle. If we start one right now the two cycles |
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|
2110 // overlap. In particular, the concurrent marking thread might |
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|
2111 // be in the process of clearing the next marking bitmap (which |
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|
2112 // we will use for the next cycle if we start one). Starting a |
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2113 // cycle now will be bad given that parts of the marking |
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|
2114 // information might get cleared by the marking thread. And we |
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2115 // cannot wait for the marking thread to finish the cycle as it |
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|
2116 // periodically yields while clearing the next marking bitmap |
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2117 // and, if it's in a yield point, it's waiting for us to |
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2118 // finish. So, at this point we will not start a cycle and we'll |
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2119 // let the concurrent marking thread complete the last one. |
3914
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|
2120 ergo_verbose0(ErgoConcCycles, |
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2121 "do not initiate concurrent cycle", |
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|
2122 ergo_format_reason("concurrent cycle already in progress")); |
1359
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2123 } |
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2124 } |
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2125 } |
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|
2126 |
342 | 2127 class KnownGarbageClosure: public HeapRegionClosure { |
4912
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|
2128 G1CollectedHeap* _g1h; |
342 | 2129 CollectionSetChooser* _hrSorted; |
2130 | |
2131 public: | |
2132 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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2133 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 2134 |
2135 bool doHeapRegion(HeapRegion* r) { | |
2136 // We only include humongous regions in collection | |
2137 // sets when concurrent mark shows that their contained object is | |
2138 // unreachable. | |
2139 | |
2140 // Do we have any marking information for this region? | |
2141 if (r->is_marked()) { | |
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2142 // We will skip any region that's currently used as an old GC |
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2143 // alloc region (we should not consider those for collection |
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|
2144 // before we fill them up). |
6011 | 2145 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
2146 _hrSorted->add_region(r); | |
342 | 2147 } |
2148 } | |
2149 return false; | |
2150 } | |
2151 }; | |
2152 | |
2153 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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2154 G1CollectedHeap* _g1h; |
342 | 2155 CollectionSetChooser* _hrSorted; |
6011 | 2156 uint _marked_regions_added; |
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|
2157 size_t _reclaimable_bytes_added; |
6011 | 2158 uint _chunk_size; |
2159 uint _cur_chunk_idx; | |
2160 uint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
342 | 2161 |
2162 void get_new_chunk() { | |
6011 | 2163 _cur_chunk_idx = _hrSorted->claim_array_chunk(_chunk_size); |
342 | 2164 _cur_chunk_end = _cur_chunk_idx + _chunk_size; |
2165 } | |
2166 void add_region(HeapRegion* r) { | |
2167 if (_cur_chunk_idx == _cur_chunk_end) { | |
2168 get_new_chunk(); | |
2169 } | |
2170 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
6011 | 2171 _hrSorted->set_region(_cur_chunk_idx, r); |
342 | 2172 _marked_regions_added++; |
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2173 _reclaimable_bytes_added += r->reclaimable_bytes(); |
342 | 2174 _cur_chunk_idx++; |
2175 } | |
2176 | |
2177 public: | |
2178 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
6011 | 2179 uint chunk_size) : |
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2180 _g1h(G1CollectedHeap::heap()), |
6011 | 2181 _hrSorted(hrSorted), _chunk_size(chunk_size), |
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2182 _marked_regions_added(0), _reclaimable_bytes_added(0), |
6011 | 2183 _cur_chunk_idx(0), _cur_chunk_end(0) { } |
342 | 2184 |
2185 bool doHeapRegion(HeapRegion* r) { | |
2186 // Do we have any marking information for this region? | |
2187 if (r->is_marked()) { | |
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2188 // We will skip any region that's currently used as an old GC |
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2189 // alloc region (we should not consider those for collection |
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2190 // before we fill them up). |
6011 | 2191 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 2192 add_region(r); |
2193 } | |
2194 } | |
2195 return false; | |
2196 } | |
6011 | 2197 uint marked_regions_added() { return _marked_regions_added; } |
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2198 size_t reclaimable_bytes_added() { return _reclaimable_bytes_added; } |
342 | 2199 }; |
2200 | |
2201 class ParKnownGarbageTask: public AbstractGangTask { | |
2202 CollectionSetChooser* _hrSorted; | |
6011 | 2203 uint _chunk_size; |
342 | 2204 G1CollectedHeap* _g1; |
2205 public: | |
6011 | 2206 ParKnownGarbageTask(CollectionSetChooser* hrSorted, uint chunk_size) : |
342 | 2207 AbstractGangTask("ParKnownGarbageTask"), |
2208 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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2209 _g1(G1CollectedHeap::heap()) { } |
342 | 2210 |
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2211 void work(uint worker_id) { |
6011 | 2212 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size); |
2213 | |
342 | 2214 // Back to zero for the claim value. |
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2215 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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2216 _g1->workers()->active_workers(), |
355 | 2217 HeapRegion::InitialClaimValue); |
6011 | 2218 uint regions_added = parKnownGarbageCl.marked_regions_added(); |
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2219 size_t reclaimable_bytes_added = |
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2220 parKnownGarbageCl.reclaimable_bytes_added(); |
6011 | 2221 _hrSorted->update_totals(regions_added, reclaimable_bytes_added); |
342 | 2222 } |
2223 }; | |
2224 | |
2225 void | |
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2226 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
6011 | 2227 _collectionSetChooser->clear(); |
4013 | 2228 |
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2229 uint region_num = _g1->n_regions(); |
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2230 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2231 const uint OverpartitionFactor = 4; |
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2232 uint WorkUnit; |
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2233 // The use of MinChunkSize = 8 in the original code |
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2234 // causes some assertion failures when the total number of |
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2235 // region is less than 8. The code here tries to fix that. |
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2236 // Should the original code also be fixed? |
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2237 if (no_of_gc_threads > 0) { |
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2238 const uint MinWorkUnit = MAX2(region_num / no_of_gc_threads, 1U); |
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2239 WorkUnit = MAX2(region_num / (no_of_gc_threads * OverpartitionFactor), |
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2240 MinWorkUnit); |
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2241 } else { |
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2242 assert(no_of_gc_threads > 0, |
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2243 "The active gc workers should be greater than 0"); |
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2244 // In a product build do something reasonable to avoid a crash. |
6010
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2245 const uint MinWorkUnit = MAX2(region_num / (uint) ParallelGCThreads, 1U); |
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2246 WorkUnit = |
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2247 MAX2(region_num / (uint) (ParallelGCThreads * OverpartitionFactor), |
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2248 MinWorkUnit); |
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2249 } |
6011 | 2250 _collectionSetChooser->prepare_for_par_region_addition(_g1->n_regions(), |
2251 WorkUnit); | |
342 | 2252 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2253 (int) WorkUnit); |
342 | 2254 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2255 |
2256 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2257 "sanity check"); | |
342 | 2258 } else { |
2259 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2260 _g1->heap_region_iterate(&knownGarbagecl); | |
2261 } | |
4013 | 2262 |
6011 | 2263 _collectionSetChooser->sort_regions(); |
2264 | |
4013 | 2265 double end_sec = os::elapsedTime(); |
2266 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; | |
2267 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2268 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2269 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2270 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2271 } |
2272 | |
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2273 // Add the heap region at the head of the non-incremental collection set |
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2274 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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2275 assert(_inc_cset_build_state == Active, "Precondition"); |
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2276 assert(!hr->is_young(), "non-incremental add of young region"); |
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2277 |
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2278 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2279 hr->set_in_collection_set(true); |
2280 hr->set_next_in_collection_set(_collection_set); | |
2281 _collection_set = hr; | |
2282 _collection_set_bytes_used_before += hr->used(); | |
526 | 2283 _g1->register_region_with_in_cset_fast_test(hr); |
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2284 size_t rs_length = hr->rem_set()->occupied(); |
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2285 _recorded_rs_lengths += rs_length; |
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2286 _old_cset_region_length += 1; |
342 | 2287 } |
2288 | |
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2289 // Initialize the per-collection-set information |
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2290 void G1CollectorPolicy::start_incremental_cset_building() { |
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2291 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2292 |
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2293 _inc_cset_head = NULL; |
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2294 _inc_cset_tail = NULL; |
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2295 _inc_cset_bytes_used_before = 0; |
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2296 |
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2297 _inc_cset_max_finger = 0; |
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2298 _inc_cset_recorded_rs_lengths = 0; |
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2299 _inc_cset_recorded_rs_lengths_diffs = 0; |
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2300 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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2301 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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2302 _inc_cset_build_state = Active; |
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2303 } |
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2304 |
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2305 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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2306 assert(_inc_cset_build_state == Active, "Precondition"); |
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2307 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2308 |
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2309 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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2310 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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2311 // that adds a new region to the CSet. Further updates by the |
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2312 // concurrent refinement thread that samples the young RSet lengths |
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2313 // are accumulated in the *_diffs fields. Here we add the diffs to |
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2314 // the "main" fields. |
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2315 |
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2316 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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2317 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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2318 } else { |
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2319 // This is defensive. The diff should in theory be always positive |
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2320 // as RSets can only grow between GCs. However, given that we |
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2321 // sample their size concurrently with other threads updating them |
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2322 // it's possible that we might get the wrong size back, which |
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2323 // could make the calculations somewhat inaccurate. |
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2324 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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2325 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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2326 _inc_cset_recorded_rs_lengths -= diffs; |
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2327 } else { |
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2328 _inc_cset_recorded_rs_lengths = 0; |
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2329 } |
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2330 } |
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2331 _inc_cset_predicted_elapsed_time_ms += |
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2332 _inc_cset_predicted_elapsed_time_ms_diffs; |
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2333 |
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2334 _inc_cset_recorded_rs_lengths_diffs = 0; |
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2335 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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2336 } |
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2337 |
1394
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2338 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2339 // This routine is used when: |
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2340 // * adding survivor regions to the incremental cset at the end of an |
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2341 // evacuation pause, |
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parents:
1391
diff
changeset
|
2342 // * adding the current allocation region to the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2343 // when it is retired, and |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2344 // * updating existing policy information for a region in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2345 // incremental cset via young list RSet sampling. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2346 // Therefore this routine may be called at a safepoint by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2347 // VM thread, or in-between safepoints by mutator threads (when |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2348 // retiring the current allocation region) or a concurrent |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2349 // refine thread (RSet sampling). |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2350 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2351 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2352 size_t used_bytes = hr->used(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2353 _inc_cset_recorded_rs_lengths += rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2354 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2355 _inc_cset_bytes_used_before += used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2356 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2357 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2358 // in the heap region in case we have to remove this region from |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2359 // the incremental collection set, or it is updated by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2360 // rset sampling code |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2361 hr->set_recorded_rs_length(rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2362 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2363 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2364 |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2365 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2366 size_t new_rs_length) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2367 // Update the CSet information that is dependent on the new RS length |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2368 assert(hr->is_young(), "Precondition"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2369 assert(!SafepointSynchronize::is_at_safepoint(), |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2370 "should not be at a safepoint"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2371 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2372 // We could have updated _inc_cset_recorded_rs_lengths and |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2373 // _inc_cset_predicted_elapsed_time_ms directly but we'd need to do |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2374 // that atomically, as this code is executed by a concurrent |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2375 // refinement thread, potentially concurrently with a mutator thread |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2376 // allocating a new region and also updating the same fields. To |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2377 // avoid the atomic operations we accumulate these updates on two |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2378 // separate fields (*_diffs) and we'll just add them to the "main" |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2379 // fields at the start of a GC. |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2380 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2381 ssize_t old_rs_length = (ssize_t) hr->recorded_rs_length(); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2382 ssize_t rs_lengths_diff = (ssize_t) new_rs_length - old_rs_length; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2383 _inc_cset_recorded_rs_lengths_diffs += rs_lengths_diff; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2384 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2385 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2386 double new_region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2387 double elapsed_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2388 _inc_cset_predicted_elapsed_time_ms_diffs += elapsed_ms_diff; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2389 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2390 hr->set_recorded_rs_length(new_rs_length); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2391 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2392 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2393 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2394 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2395 assert(hr->is_young(), "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2396 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2397 assert(_inc_cset_build_state == Active, "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2398 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2399 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2400 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2401 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2402 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2403 // 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
|
2404 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2405 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2406 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2407 add_to_incremental_cset_info(hr, rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2408 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2409 HeapWord* hr_end = hr->end(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2410 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2411 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2412 assert(!hr->in_collection_set(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2413 hr->set_in_collection_set(true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2414 assert( hr->next_in_collection_set() == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2415 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2416 _g1->register_region_with_in_cset_fast_test(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2417 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2418 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2419 // Add the region at the RHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2420 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2421 // We should only ever be appending survivors at the end of a pause |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2422 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
|
2423 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2424 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2425 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
|
2426 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2427 // Now add the region at the right hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2428 if (_inc_cset_tail == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2429 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2430 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2431 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2432 _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
|
2433 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2434 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2435 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2436 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2437 // 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
|
2438 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
|
2439 // 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
|
2440 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
|
2441 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2442 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2443 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
|
2444 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2445 // 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
|
2446 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
|
2447 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
|
2448 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
|
2449 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2450 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2451 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2452 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2453 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2454 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2455 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
|
2456 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
|
2457 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2458 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
|
2459 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2460 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2461 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
|
2462 assert(csr->in_collection_set(), "bad CS"); |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
2463 st->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
2464 HR_FORMAT_PARAMS(csr), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
2465 csr->prev_top_at_mark_start(), csr->next_top_at_mark_start(), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
2466 csr->age_in_surv_rate_group_cond()); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2467 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2468 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2469 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2470 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2471 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2472 bool G1CollectorPolicy::next_gc_should_be_mixed(const char* true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2473 const char* false_action_str) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2474 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 2475 if (cset_chooser->is_empty()) { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2476 ergo_verbose0(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2477 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2478 ergo_format_reason("candidate old regions not available")); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2479 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2480 } |
6011 | 2481 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2482 size_t capacity_bytes = _g1->capacity(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2483 double perc = (double) reclaimable_bytes * 100.0 / (double) capacity_bytes; |
5964
21595f05bc93
7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs
tonyp
parents:
4912
diff
changeset
|
2484 double threshold = (double) G1HeapWastePercent; |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2485 if (perc < threshold) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2486 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2487 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2488 ergo_format_reason("reclaimable percentage lower than threshold") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2489 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2490 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2491 ergo_format_perc("threshold"), |
6011 | 2492 cset_chooser->remaining_regions(), |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2493 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2494 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2495 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2496 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2497 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2498 true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2499 ergo_format_reason("candidate old regions available") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2500 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2501 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2502 ergo_format_perc("threshold"), |
6011 | 2503 cset_chooser->remaining_regions(), |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2504 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2505 return true; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2506 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2507 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2508 void G1CollectorPolicy::finalize_cset(double target_pause_time_ms) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2509 // Set this here - in case we're not doing young collections. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2510 double non_young_start_time_sec = os::elapsedTime(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2511 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2512 YoungList* young_list = _g1->young_list(); |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2513 finalize_incremental_cset_building(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2514 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2515 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2516 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
|
2517 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2518 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2519 |
2520 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2521 double predicted_pause_time_ms = base_time_ms; | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2522 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2523 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2524 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2525 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2526 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
|
2527 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2528 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
|
2529 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
|
2530 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2531 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2532 double young_start_time_sec = os::elapsedTime(); |
342 | 2533 |
677 | 2534 _collection_set_bytes_used_before = 0; |
4710 | 2535 _last_gc_was_young = gcs_are_young() ? true : false; |
2536 | |
2537 if (_last_gc_was_young) { | |
2538 ++_young_pause_num; | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2539 } else { |
4710 | 2540 ++_mixed_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2541 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2542 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2543 // The young list is laid with the survivor regions from the previous |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2544 // pause are appended to the RHS of the young list, i.e. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2545 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2546 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2547 uint survivor_region_length = young_list->survivor_length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2548 uint eden_region_length = young_list->length() - survivor_region_length; |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2549 init_cset_region_lengths(eden_region_length, survivor_region_length); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2550 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2551 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2552 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2553 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2554 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2555 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2556 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2557 // Clear the fields that point to the survivor list - they are all young now. |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2558 young_list->clear_survivors(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2559 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2560 _collection_set = _inc_cset_head; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2561 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2562 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2563 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2564 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2565 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2566 "add young regions to CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2567 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2568 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2569 ergo_format_ms("predicted young region time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2570 eden_region_length, survivor_region_length, |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2571 _inc_cset_predicted_elapsed_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2572 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2573 // The number of recorded young regions is the incremental |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2574 // collection set's current size |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2575 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2576 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2577 double young_end_time_sec = os::elapsedTime(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2578 _recorded_young_cset_choice_time_ms = |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2579 (young_end_time_sec - young_start_time_sec) * 1000.0; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2580 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2581 // We are doing young collections so reset this. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2582 non_young_start_time_sec = young_end_time_sec; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2583 |
4710 | 2584 if (!gcs_are_young()) { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2585 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 2586 cset_chooser->verify(); |
2587 const uint min_old_cset_length = cset_chooser->calc_min_old_cset_length(); | |
2588 const uint max_old_cset_length = cset_chooser->calc_max_old_cset_length(); | |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2589 |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2590 uint expensive_region_num = 0; |
4912
a9647476d1a4
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|
2591 bool check_time_remaining = adaptive_young_list_length(); |
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2592 HeapRegion* hr = cset_chooser->peek(); |
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2593 while (hr != NULL) { |
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2594 if (old_cset_region_length() >= max_old_cset_length) { |
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|
2595 // Added maximum number of old regions to the CSet. |
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|
2596 ergo_verbose2(ErgoCSetConstruction, |
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|
2597 "finish adding old regions to CSet", |
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|
2598 ergo_format_reason("old CSet region num reached max") |
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|
2599 ergo_format_region("old") |
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|
2600 ergo_format_region("max"), |
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|
2601 old_cset_region_length(), max_old_cset_length); |
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2602 break; |
342 | 2603 } |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2604 |
4912
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|
2605 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
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2606 if (check_time_remaining) { |
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2607 if (predicted_time_ms > time_remaining_ms) { |
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2608 // Too expensive for the current CSet. |
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|
2609 |
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2610 if (old_cset_region_length() >= min_old_cset_length) { |
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2611 // We have added the minimum number of old regions to the CSet, |
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2612 // we are done with this CSet. |
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|
2613 ergo_verbose4(ErgoCSetConstruction, |
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|
2614 "finish adding old regions to CSet", |
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|
2615 ergo_format_reason("predicted time is too high") |
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|
2616 ergo_format_ms("predicted time") |
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|
2617 ergo_format_ms("remaining time") |
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|
2618 ergo_format_region("old") |
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|
2619 ergo_format_region("min"), |
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|
2620 predicted_time_ms, time_remaining_ms, |
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|
2621 old_cset_region_length(), min_old_cset_length); |
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2622 break; |
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|
2623 } |
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2624 |
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2625 // We'll add it anyway given that we haven't reached the |
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|
2626 // minimum number of old regions. |
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|
2627 expensive_region_num += 1; |
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|
2628 } |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2629 } else { |
4912
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2630 if (old_cset_region_length() >= min_old_cset_length) { |
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2631 // In the non-auto-tuning case, we'll finish adding regions |
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2632 // to the CSet if we reach the minimum. |
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|
2633 ergo_verbose2(ErgoCSetConstruction, |
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|
2634 "finish adding old regions to CSet", |
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|
2635 ergo_format_reason("old CSet region num reached min") |
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|
2636 ergo_format_region("old") |
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|
2637 ergo_format_region("min"), |
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|
2638 old_cset_region_length(), min_old_cset_length); |
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|
2639 break; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2640 } |
20213c8a3c40
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diff
changeset
|
2641 } |
4912
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|
2642 |
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2643 // We will add this region to the CSet. |
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|
2644 time_remaining_ms -= predicted_time_ms; |
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|
2645 predicted_pause_time_ms += predicted_time_ms; |
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|
2646 cset_chooser->remove_and_move_to_next(hr); |
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|
2647 _g1->old_set_remove(hr); |
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|
2648 add_old_region_to_cset(hr); |
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|
2649 |
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2650 hr = cset_chooser->peek(); |
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|
2651 } |
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|
2652 if (hr == NULL) { |
a9647476d1a4
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changeset
|
2653 ergo_verbose0(ErgoCSetConstruction, |
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4837
diff
changeset
|
2654 "finish adding old regions to CSet", |
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4837
diff
changeset
|
2655 ergo_format_reason("candidate old regions not available")); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
changeset
|
2656 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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diff
changeset
|
2657 |
4912
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diff
changeset
|
2658 if (expensive_region_num > 0) { |
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changeset
|
2659 // We print the information once here at the end, predicated on |
a9647476d1a4
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4837
diff
changeset
|
2660 // whether we added any apparently expensive regions or not, to |
a9647476d1a4
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4837
diff
changeset
|
2661 // avoid generating output per region. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2662 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
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4837
diff
changeset
|
2663 "added expensive regions to CSet", |
a9647476d1a4
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4837
diff
changeset
|
2664 ergo_format_reason("old CSet region num not reached min") |
a9647476d1a4
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4837
diff
changeset
|
2665 ergo_format_region("old") |
a9647476d1a4
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diff
changeset
|
2666 ergo_format_region("expensive") |
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diff
changeset
|
2667 ergo_format_region("min") |
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diff
changeset
|
2668 ergo_format_ms("remaining time"), |
a9647476d1a4
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diff
changeset
|
2669 old_cset_region_length(), |
a9647476d1a4
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parents:
4837
diff
changeset
|
2670 expensive_region_num, |
a9647476d1a4
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diff
changeset
|
2671 min_old_cset_length, |
a9647476d1a4
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diff
changeset
|
2672 time_remaining_ms); |
a9647476d1a4
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diff
changeset
|
2673 } |
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changeset
|
2674 |
6011 | 2675 cset_chooser->verify(); |
342 | 2676 } |
2677 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2678 stop_incremental_cset_building(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2679 |
342 | 2680 count_CS_bytes_used(); |
2681 | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2682 ergo_verbose5(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2683 "finish choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2684 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2685 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2686 ergo_format_region("old") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2687 ergo_format_ms("predicted pause time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2688 ergo_format_ms("target pause time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2689 eden_region_length, survivor_region_length, |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2690 old_cset_region_length(), |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2691 predicted_pause_time_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2692 |
342 | 2693 double non_young_end_time_sec = os::elapsedTime(); |
2694 _recorded_non_young_cset_choice_time_ms = | |
2695 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2696 } |