Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 5986:500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
Summary: Tiered compilation has increased the number of nmethods in the code cache. This has, in turn, significantly increased the number of marked nmethods processed during the StrongRootsScope destructor. Create a specialized version of CodeBlobToOopClosure for G1 which places only those nmethods that contain pointers into the collection set on to the marked nmethods list.
Reviewed-by: iveresov, tonyp
author | johnc |
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date | Tue, 13 Mar 2012 11:05:32 -0700 |
parents | 21595f05bc93 |
children | 2a0172480595 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 32 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
33 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
34 #include "runtime/arguments.hpp" | |
35 #include "runtime/java.hpp" | |
36 #include "runtime/mutexLocker.hpp" | |
37 #include "utilities/debug.hpp" | |
342 | 38 |
39 // Different defaults for different number of GC threads | |
40 // They were chosen by running GCOld and SPECjbb on debris with different | |
41 // numbers of GC threads and choosing them based on the results | |
42 | |
43 // all the same | |
44 static double rs_length_diff_defaults[] = { | |
45 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
46 }; | |
47 | |
48 static double cost_per_card_ms_defaults[] = { | |
49 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
50 }; | |
51 | |
52 // all the same | |
4710 | 53 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 54 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
55 }; | |
56 | |
57 static double cost_per_entry_ms_defaults[] = { | |
58 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
59 }; | |
60 | |
61 static double cost_per_byte_ms_defaults[] = { | |
62 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
63 }; | |
64 | |
65 // these should be pretty consistent | |
66 static double constant_other_time_ms_defaults[] = { | |
67 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
68 }; | |
69 | |
70 | |
71 static double young_other_cost_per_region_ms_defaults[] = { | |
72 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
73 }; | |
74 | |
75 static double non_young_other_cost_per_region_ms_defaults[] = { | |
76 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
77 }; | |
78 | |
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79 // Help class for avoiding interleaved logging |
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80 class LineBuffer: public StackObj { |
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81 |
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82 private: |
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83 static const int BUFFER_LEN = 1024; |
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84 static const int INDENT_CHARS = 3; |
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85 char _buffer[BUFFER_LEN]; |
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86 int _indent_level; |
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87 int _cur; |
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88 |
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89 void vappend(const char* format, va_list ap) { |
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90 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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91 if (res != -1) { |
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92 _cur += res; |
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93 } else { |
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94 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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95 _buffer[BUFFER_LEN -1] = 0; |
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96 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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97 } |
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98 } |
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99 |
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100 public: |
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101 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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102 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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103 _buffer[_cur] = ' '; |
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104 } |
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105 } |
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106 |
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107 #ifndef PRODUCT |
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108 ~LineBuffer() { |
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109 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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110 } |
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111 #endif |
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112 |
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113 void append(const char* format, ...) { |
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114 va_list ap; |
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115 va_start(ap, format); |
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116 vappend(format, ap); |
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117 va_end(ap); |
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118 } |
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119 |
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120 void append_and_print_cr(const char* format, ...) { |
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121 va_list ap; |
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122 va_start(ap, format); |
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123 vappend(format, ap); |
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124 va_end(ap); |
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125 gclog_or_tty->print_cr("%s", _buffer); |
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126 _cur = _indent_level * INDENT_CHARS; |
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127 } |
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128 }; |
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129 |
342 | 130 G1CollectorPolicy::G1CollectorPolicy() : |
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131 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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132 ? ParallelGCThreads : 1), |
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133 |
342 | 134 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
135 _all_pause_times_ms(new NumberSeq()), | |
136 _stop_world_start(0.0), | |
137 _all_stop_world_times_ms(new NumberSeq()), | |
138 _all_yield_times_ms(new NumberSeq()), | |
139 | |
677 | 140 _summary(new Summary()), |
342 | 141 |
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142 _cur_clear_ct_time_ms(0.0), |
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143 _mark_closure_time_ms(0.0), |
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144 _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 | |
195 _known_garbage_ratio(0.0), | |
196 _known_garbage_bytes(0), | |
197 | |
198 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
199 | |
4710 | 200 _recent_prev_end_times_for_all_gcs_sec( |
201 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 202 |
203 _recent_avg_pause_time_ratio(0.0), | |
204 | |
205 _all_full_gc_times_ms(new NumberSeq()), | |
206 | |
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207 _initiate_conc_mark_if_possible(false), |
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208 _during_initial_mark_pause(false), |
4710 | 209 _last_young_gc(false), |
210 _last_gc_was_young(false), | |
342 | 211 |
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212 _eden_bytes_before_gc(0), |
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213 _survivor_bytes_before_gc(0), |
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214 _capacity_before_gc(0), |
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215 |
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216 _eden_cset_region_length(0), |
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217 _survivor_cset_region_length(0), |
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218 _old_cset_region_length(0), |
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219 |
342 | 220 _collection_set(NULL), |
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221 _collection_set_bytes_used_before(0), |
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222 |
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223 // Incremental CSet attributes |
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224 _inc_cset_build_state(Inactive), |
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225 _inc_cset_head(NULL), |
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226 _inc_cset_tail(NULL), |
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227 _inc_cset_bytes_used_before(0), |
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228 _inc_cset_max_finger(NULL), |
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229 _inc_cset_recorded_rs_lengths(0), |
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230 _inc_cset_recorded_rs_lengths_diffs(0), |
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231 _inc_cset_predicted_elapsed_time_ms(0.0), |
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232 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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233 |
342 | 234 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
235 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
236 #endif // _MSC_VER | |
237 | |
238 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
239 G1YoungSurvRateNumRegionsSummary)), | |
240 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 241 G1YoungSurvRateNumRegionsSummary)), |
342 | 242 // add here any more surv rate groups |
545 | 243 _recorded_survivor_regions(0), |
244 _recorded_survivor_head(NULL), | |
245 _recorded_survivor_tail(NULL), | |
1356 | 246 _survivors_age_table(true), |
247 | |
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248 _gc_overhead_perc(0.0) { |
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249 |
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250 // Set up the region size and associated fields. Given that the |
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251 // policy is created before the heap, we have to set this up here, |
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252 // so it's done as soon as possible. |
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253 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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254 HeapRegionRemSet::setup_remset_size(); |
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255 |
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256 G1ErgoVerbose::initialize(); |
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257 if (PrintAdaptiveSizePolicy) { |
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258 // Currently, we only use a single switch for all the heuristics. |
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259 G1ErgoVerbose::set_enabled(true); |
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260 // Given that we don't currently have a verboseness level |
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261 // parameter, we'll hardcode this to high. This can be easily |
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262 // changed in the future. |
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263 G1ErgoVerbose::set_level(ErgoHigh); |
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264 } else { |
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265 G1ErgoVerbose::set_enabled(false); |
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266 } |
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267 |
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268 // Verify PLAB sizes |
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269 const size_t region_size = HeapRegion::GrainWords; |
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270 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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271 char buffer[128]; |
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272 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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273 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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274 vm_exit_during_initialization(buffer); |
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275 } |
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276 |
342 | 277 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
278 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
279 | |
1611 | 280 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 281 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
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282 _par_last_satb_filtering_times_ms = new double[_parallel_gc_threads]; |
342 | 283 |
284 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
285 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
286 | |
287 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
288 | |
289 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
290 | |
291 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 292 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
293 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 294 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
4023 | 295 _par_last_gc_worker_other_times_ms = new double[_parallel_gc_threads]; |
342 | 296 |
297 int index; | |
298 if (ParallelGCThreads == 0) | |
299 index = 0; | |
300 else if (ParallelGCThreads > 8) | |
301 index = 7; | |
302 else | |
303 index = ParallelGCThreads - 1; | |
304 | |
305 _pending_card_diff_seq->add(0.0); | |
306 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
307 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 308 _young_cards_per_entry_ratio_seq->add( |
309 young_cards_per_entry_ratio_defaults[index]); | |
342 | 310 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
311 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
312 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
313 _young_other_cost_per_region_ms_seq->add( | |
314 young_other_cost_per_region_ms_defaults[index]); | |
315 _non_young_other_cost_per_region_ms_seq->add( | |
316 non_young_other_cost_per_region_ms_defaults[index]); | |
317 | |
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318 // Below, we might need to calculate the pause time target based on |
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319 // the pause interval. When we do so we are going to give G1 maximum |
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320 // flexibility and allow it to do pauses when it needs to. So, we'll |
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321 // arrange that the pause interval to be pause time target + 1 to |
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322 // ensure that a) the pause time target is maximized with respect to |
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323 // the pause interval and b) we maintain the invariant that pause |
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324 // time target < pause interval. If the user does not want this |
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325 // maximum flexibility, they will have to set the pause interval |
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326 // explicitly. |
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327 |
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328 // First make sure that, if either parameter is set, its value is |
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329 // reasonable. |
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330 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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331 if (MaxGCPauseMillis < 1) { |
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332 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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333 "greater than 0"); |
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334 } |
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335 } |
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336 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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337 if (GCPauseIntervalMillis < 1) { |
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338 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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339 "greater than 0"); |
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340 } |
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341 } |
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342 |
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343 // Then, if the pause time target parameter was not set, set it to |
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344 // the default value. |
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345 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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346 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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347 // The default pause time target in G1 is 200ms |
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348 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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349 } else { |
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350 // We do not allow the pause interval to be set without the |
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351 // pause time target |
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352 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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353 "without setting MaxGCPauseMillis"); |
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354 } |
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355 } |
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356 |
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357 // Then, if the interval parameter was not set, set it according to |
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358 // the pause time target (this will also deal with the case when the |
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359 // pause time target is the default value). |
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360 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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361 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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362 } |
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363 |
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364 // Finally, make sure that the two parameters are consistent. |
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365 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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366 char buffer[256]; |
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367 jio_snprintf(buffer, 256, |
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368 "MaxGCPauseMillis (%u) should be less than " |
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369 "GCPauseIntervalMillis (%u)", |
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370 MaxGCPauseMillis, GCPauseIntervalMillis); |
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371 vm_exit_during_initialization(buffer); |
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372 } |
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373 |
751 | 374 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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375 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 376 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 377 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 378 |
379 // start conservatively (around 50ms is about right) | |
380 _concurrent_mark_remark_times_ms->add(0.05); | |
381 _concurrent_mark_cleanup_times_ms->add(0.20); | |
382 _tenuring_threshold = MaxTenuringThreshold; | |
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383 // _max_survivor_regions will be calculated by |
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384 // update_young_list_target_length() during initialization. |
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385 _max_survivor_regions = 0; |
545 | 386 |
1356 | 387 assert(GCTimeRatio > 0, |
388 "we should have set it to a default value set_g1_gc_flags() " | |
389 "if a user set it to 0"); | |
390 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
391 | |
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392 uintx reserve_perc = G1ReservePercent; |
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393 // Put an artificial ceiling on this so that it's not set to a silly value. |
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394 if (reserve_perc > 50) { |
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395 reserve_perc = 50; |
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396 warning("G1ReservePercent is set to a value that is too large, " |
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397 "it's been updated to %u", reserve_perc); |
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398 } |
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399 _reserve_factor = (double) reserve_perc / 100.0; |
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400 // This will be set when the heap is expanded |
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401 // for the first time during initialization. |
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402 _reserve_regions = 0; |
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403 |
342 | 404 initialize_all(); |
4013 | 405 _collectionSetChooser = new CollectionSetChooser(); |
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406 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 407 } |
408 | |
409 void G1CollectorPolicy::initialize_flags() { | |
410 set_min_alignment(HeapRegion::GrainBytes); | |
411 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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412 if (SurvivorRatio < 1) { |
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413 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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414 } |
342 | 415 CollectorPolicy::initialize_flags(); |
416 } | |
417 | |
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418 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
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419 assert(G1DefaultMinNewGenPercent <= G1DefaultMaxNewGenPercent, "Min larger than max"); |
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420 assert(G1DefaultMinNewGenPercent > 0 && G1DefaultMinNewGenPercent < 100, "Min out of bounds"); |
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421 assert(G1DefaultMaxNewGenPercent > 0 && G1DefaultMaxNewGenPercent < 100, "Max out of bounds"); |
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422 |
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423 if (FLAG_IS_CMDLINE(NewRatio)) { |
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424 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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425 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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426 } else { |
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427 _sizer_kind = SizerNewRatio; |
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428 _adaptive_size = false; |
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429 return; |
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430 } |
3976 | 431 } |
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432 |
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433 if (FLAG_IS_CMDLINE(NewSize)) { |
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434 _min_desired_young_length = MAX2((size_t) 1, NewSize / HeapRegion::GrainBytes); |
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435 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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436 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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437 _sizer_kind = SizerMaxAndNewSize; |
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438 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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439 } else { |
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440 _sizer_kind = SizerNewSizeOnly; |
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441 } |
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442 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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443 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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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 size_t G1YoungGenSizer::calculate_default_min_length(size_t new_number_of_heap_regions) { |
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449 size_t default_value = (new_number_of_heap_regions * G1DefaultMinNewGenPercent) / 100; |
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450 return MAX2((size_t)1, default_value); |
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451 } |
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452 |
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453 size_t G1YoungGenSizer::calculate_default_max_length(size_t new_number_of_heap_regions) { |
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454 size_t default_value = (new_number_of_heap_regions * G1DefaultMaxNewGenPercent) / 100; |
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455 return MAX2((size_t)1, default_value); |
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456 } |
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457 |
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458 void G1YoungGenSizer::heap_size_changed(size_t 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(size_t young_length, |
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516 double base_time_ms, |
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517 size_t 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(size_t 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 = (size_t) 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 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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557 size_t base_min_length) { |
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558 size_t 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 = (size_t) 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 size_t 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 size_t 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 size_t absolute_min_length = base_min_length + 1; |
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595 size_t 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 size_t 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 size_t 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 size_t 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; |
3919
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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 size_t |
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652 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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653 size_t base_min_length, |
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654 size_t desired_min_length, |
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655 size_t 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 size_t 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 size_t 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 size_t available_free_regions = _free_regions_at_end_of_collection; |
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683 size_t 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 size_t diff = (max_young_length - min_young_length) / 2; |
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721 while (diff > 0) { |
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722 size_t 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 | |
1394
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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 _known_garbage_bytes = 0; |
867 _known_garbage_ratio = 0.0; | |
868 _in_marking_window = false; | |
869 _in_marking_window_im = false; | |
870 | |
871 _short_lived_surv_rate_group->start_adding_regions(); | |
872 // also call this on any additional surv rate groups | |
873 | |
545 | 874 record_survivor_regions(0, NULL, NULL); |
875 | |
342 | 876 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 877 // Reset survivors SurvRateGroup. |
878 _survivor_surv_rate_group->reset(); | |
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879 update_young_list_target_length(); |
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880 _collectionSetChooser->clearMarkedHeapRegions(); |
1973 | 881 } |
342 | 882 |
883 void G1CollectorPolicy::record_stop_world_start() { | |
884 _stop_world_start = os::elapsedTime(); | |
885 } | |
886 | |
887 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
888 size_t start_used) { | |
889 if (PrintGCDetails) { | |
890 gclog_or_tty->stamp(PrintGCTimeStamps); | |
891 gclog_or_tty->print("[GC pause"); | |
4710 | 892 gclog_or_tty->print(" (%s)", gcs_are_young() ? "young" : "mixed"); |
342 | 893 } |
894 | |
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895 // We only need to do this here as the policy will only be applied |
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896 // to the GC we're about to start. so, no point is calculating this |
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897 // every time we calculate / recalculate the target young length. |
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898 update_survivors_policy(); |
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899 |
1973 | 900 assert(_g1->used() == _g1->recalculate_used(), |
901 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
902 _g1->used(), _g1->recalculate_used())); | |
342 | 903 |
904 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
905 _all_stop_world_times_ms->add(s_w_t_ms); | |
906 _stop_world_start = 0.0; | |
907 | |
908 _cur_collection_start_sec = start_time_sec; | |
909 _cur_collection_pause_used_at_start_bytes = start_used; | |
910 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
911 _pending_cards = _g1->pending_card_num(); | |
912 _max_pending_cards = _g1->max_pending_card_num(); | |
913 | |
914 _bytes_in_collection_set_before_gc = 0; | |
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915 _bytes_copied_during_gc = 0; |
342 | 916 |
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917 YoungList* young_list = _g1->young_list(); |
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918 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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919 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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920 _capacity_before_gc = _g1->capacity(); |
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921 |
342 | 922 #ifdef DEBUG |
923 // initialise these to something well known so that we can spot | |
924 // if they are not set properly | |
925 | |
926 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 927 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
928 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
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929 _par_last_satb_filtering_times_ms[i] = -1234.0; |
1611 | 930 _par_last_update_rs_times_ms[i] = -1234.0; |
931 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
932 _par_last_scan_rs_times_ms[i] = -1234.0; | |
933 _par_last_obj_copy_times_ms[i] = -1234.0; | |
934 _par_last_termination_times_ms[i] = -1234.0; | |
935 _par_last_termination_attempts[i] = -1234.0; | |
936 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 937 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 938 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 939 } |
940 #endif | |
941 | |
942 for (int i = 0; i < _aux_num; ++i) { | |
943 _cur_aux_times_ms[i] = 0.0; | |
944 _cur_aux_times_set[i] = false; | |
945 } | |
946 | |
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947 // This is initialized to zero here and is set during |
4023 | 948 // the evacuation pause if marking is in progress. |
949 _cur_satb_drain_time_ms = 0.0; | |
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950 // This is initialized to zero here and is set during the evacuation |
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951 // pause if we actually waited for the root region scanning to finish. |
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952 _root_region_scan_wait_time_ms = 0.0; |
342 | 953 |
4710 | 954 _last_gc_was_young = false; |
342 | 955 |
956 // do that for any other surv rate groups | |
957 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 958 _survivors_age_table.clear(); |
545 | 959 |
342 | 960 assert( verify_young_ages(), "region age verification" ); |
961 } | |
962 | |
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963 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 964 mark_init_elapsed_time_ms) { |
965 _during_marking = true; | |
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966 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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967 clear_during_initial_mark_pause(); |
342 | 968 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
969 } | |
970 | |
971 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
972 _mark_remark_start_sec = os::elapsedTime(); | |
973 _during_marking = false; | |
974 } | |
975 | |
976 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
977 double end_time_sec = os::elapsedTime(); | |
978 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
979 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
980 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
981 _prev_collection_pause_end_ms += elapsed_time_ms; | |
982 | |
983 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
984 } | |
985 | |
986 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
987 _mark_cleanup_start_sec = os::elapsedTime(); | |
988 } | |
989 | |
4013 | 990 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 991 _last_young_gc = true; |
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992 _in_marking_window = false; |
342 | 993 } |
994 | |
995 void G1CollectorPolicy::record_concurrent_pause() { | |
996 if (_stop_world_start > 0.0) { | |
997 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
998 _all_yield_times_ms->add(yield_ms); | |
999 } | |
1000 } | |
1001 | |
1002 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1003 } | |
1004 | |
1005 template<class T> | |
1006 T sum_of(T* sum_arr, int start, int n, int N) { | |
1007 T sum = (T)0; | |
1008 for (int i = 0; i < n; i++) { | |
1009 int j = (start + i) % N; | |
1010 sum += sum_arr[j]; | |
1011 } | |
1012 return sum; | |
1013 } | |
1014 | |
1611 | 1015 void G1CollectorPolicy::print_par_stats(int level, |
1016 const char* str, | |
2430 | 1017 double* data) { |
342 | 1018 double min = data[0], max = data[0]; |
1019 double total = 0.0; | |
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1020 LineBuffer buf(level); |
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1021 buf.append("[%s (ms):", str); |
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1022 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1023 double val = data[i]; |
1024 if (val < min) | |
1025 min = val; | |
1026 if (val > max) | |
1027 max = val; | |
1028 total += val; | |
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1029 buf.append(" %3.1lf", val); |
342 | 1030 } |
2430 | 1031 buf.append_and_print_cr(""); |
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1032 double avg = total / (double) no_of_gc_threads(); |
2430 | 1033 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", |
1034 avg, min, max, max - min); | |
342 | 1035 } |
1036 | |
1611 | 1037 void G1CollectorPolicy::print_par_sizes(int level, |
1038 const char* str, | |
2430 | 1039 double* data) { |
342 | 1040 double min = data[0], max = data[0]; |
1041 double total = 0.0; | |
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1042 LineBuffer buf(level); |
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1043 buf.append("[%s :", str); |
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1044 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1045 double val = data[i]; |
1046 if (val < min) | |
1047 min = val; | |
1048 if (val > max) | |
1049 max = val; | |
1050 total += val; | |
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1051 buf.append(" %d", (int) val); |
342 | 1052 } |
2430 | 1053 buf.append_and_print_cr(""); |
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1054 double avg = total / (double) no_of_gc_threads(); |
2430 | 1055 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", |
1056 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1057 } |
1058 | |
4023 | 1059 void G1CollectorPolicy::print_stats(int level, |
1060 const char* str, | |
1061 double value) { | |
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1062 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1063 } |
1064 | |
4023 | 1065 void G1CollectorPolicy::print_stats(int level, |
1066 const char* str, | |
1067 int value) { | |
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1068 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1069 } |
1070 | |
4023 | 1071 double G1CollectorPolicy::avg_value(double* data) { |
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1072 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1073 double ret = 0.0; |
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1074 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1075 ret += data[i]; |
4023 | 1076 } |
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1077 return ret / (double) no_of_gc_threads(); |
342 | 1078 } else { |
1079 return data[0]; | |
1080 } | |
1081 } | |
1082 | |
4023 | 1083 double G1CollectorPolicy::max_value(double* data) { |
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1084 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1085 double ret = data[0]; |
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1086 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
4023 | 1087 if (data[i] > ret) { |
342 | 1088 ret = data[i]; |
4023 | 1089 } |
1090 } | |
342 | 1091 return ret; |
1092 } else { | |
1093 return data[0]; | |
1094 } | |
1095 } | |
1096 | |
4023 | 1097 double G1CollectorPolicy::sum_of_values(double* data) { |
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1098 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1099 double sum = 0.0; |
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1100 for (uint i = 0; i < no_of_gc_threads(); i++) { |
342 | 1101 sum += data[i]; |
4023 | 1102 } |
342 | 1103 return sum; |
1104 } else { | |
1105 return data[0]; | |
1106 } | |
1107 } | |
1108 | |
4023 | 1109 double G1CollectorPolicy::max_sum(double* data1, double* data2) { |
342 | 1110 double ret = data1[0] + data2[0]; |
1111 | |
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1112 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1113 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
342 | 1114 double data = data1[i] + data2[i]; |
4023 | 1115 if (data > ret) { |
342 | 1116 ret = data; |
4023 | 1117 } |
342 | 1118 } |
1119 } | |
1120 return ret; | |
1121 } | |
1122 | |
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1123 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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1124 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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1125 return false; |
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1126 } |
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1127 |
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1128 size_t marking_initiating_used_threshold = |
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1129 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1130 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
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1131 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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1132 |
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1133 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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1134 if (gcs_are_young()) { |
4834
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1135 ergo_verbose5(ErgoConcCycles, |
4829
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|
1136 "request concurrent cycle initiation", |
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1137 ergo_format_reason("occupancy higher than threshold") |
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1138 ergo_format_byte("occupancy") |
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1139 ergo_format_byte("allocation request") |
4829
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1140 ergo_format_byte_perc("threshold") |
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1141 ergo_format_str("source"), |
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1142 cur_used_bytes, |
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1143 alloc_byte_size, |
4829
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1144 marking_initiating_used_threshold, |
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1145 (double) InitiatingHeapOccupancyPercent, |
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|
1146 source); |
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|
1147 return true; |
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|
1148 } else { |
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|
1149 ergo_verbose5(ErgoConcCycles, |
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1150 "do not request concurrent cycle initiation", |
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6976060: G1: humongous object allocations should initiate marking cycles when necessary
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1151 ergo_format_reason("still doing mixed collections") |
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|
1152 ergo_format_byte("occupancy") |
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1153 ergo_format_byte("allocation request") |
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1154 ergo_format_byte_perc("threshold") |
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1155 ergo_format_str("source"), |
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|
1156 cur_used_bytes, |
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|
1157 alloc_byte_size, |
4829
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1158 marking_initiating_used_threshold, |
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1159 (double) InitiatingHeapOccupancyPercent, |
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|
1160 source); |
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|
1161 } |
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|
1162 } |
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|
1163 |
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|
1164 return false; |
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|
1165 } |
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1166 |
342 | 1167 // Anything below that is considered to be zero |
1168 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1169 | |
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1170 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1171 double end_time_sec = os::elapsedTime(); |
1172 double elapsed_ms = _last_pause_time_ms; | |
1833
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6984287: Regularize how GC parallel workers are specified.
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1173 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
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1174 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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1175 "otherwise, the subtraction below does not make sense"); |
342 | 1176 size_t rs_size = |
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1177 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1178 size_t cur_used_bytes = _g1->used(); |
1179 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1180 bool last_pause_included_initial_mark = false; | |
1707 | 1181 bool update_stats = !_g1->evacuation_failed(); |
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1182 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1183 |
1184 #ifndef PRODUCT | |
1185 if (G1YoungSurvRateVerbose) { | |
1186 gclog_or_tty->print_cr(""); | |
1187 _short_lived_surv_rate_group->print(); | |
1188 // do that for any other surv rate groups too | |
1189 } | |
1190 #endif // PRODUCT | |
1191 | |
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6814390: G1: remove the concept of non-generational G1
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1192 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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1193 if (last_pause_included_initial_mark) { |
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1194 record_concurrent_mark_init_end(0.0); |
4912
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1195 } else if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
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1196 // Note: this might have already been set, if during the last |
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1197 // pause we decided to start a cycle but at the beginning of |
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1198 // this pause we decided to postpone it. That's OK. |
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1199 set_initiate_conc_mark_if_possible(); |
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1200 } |
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1201 |
342 | 1202 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1203 end_time_sec, false); | |
1204 | |
1205 // This assert is exempted when we're doing parallel collection pauses, | |
1206 // because the fragmentation caused by the parallel GC allocation buffers | |
1207 // can lead to more memory being used during collection than was used | |
1208 // before. Best leave this out until the fragmentation problem is fixed. | |
1209 // Pauses in which evacuation failed can also lead to negative | |
1210 // collections, since no space is reclaimed from a region containing an | |
1211 // object whose evacuation failed. | |
1212 // Further, we're now always doing parallel collection. But I'm still | |
1213 // leaving this here as a placeholder for a more precise assertion later. | |
1214 // (DLD, 10/05.) | |
1215 assert((true || parallel) // Always using GC LABs now. | |
1216 || _g1->evacuation_failed() | |
1217 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1218 "Negative collection"); | |
1219 | |
1220 size_t freed_bytes = | |
1221 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1222 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
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|
1223 |
342 | 1224 double survival_fraction = |
1225 (double)surviving_bytes/ | |
1226 (double)_collection_set_bytes_used_before; | |
1227 | |
4023 | 1228 // These values are used to update the summary information that is |
1229 // displayed when TraceGen0Time is enabled, and are output as part | |
1230 // of the PrintGCDetails output, in the non-parallel case. | |
1231 | |
3823
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1232 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
4787
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1233 double satb_filtering_time = avg_value(_par_last_satb_filtering_times_ms); |
3823
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1234 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1235 double update_rs_processed_buffers = |
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1236 sum_of_values(_par_last_update_rs_processed_buffers); |
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1237 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1238 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1239 double termination_time = avg_value(_par_last_termination_times_ms); |
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1240 |
4023 | 1241 double known_time = ext_root_scan_time + |
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1242 satb_filtering_time + |
4023 | 1243 update_rs_time + |
1244 scan_rs_time + | |
1245 obj_copy_time; | |
1246 | |
1247 double other_time_ms = elapsed_ms; | |
1248 | |
1249 // Subtract the SATB drain time. It's initialized to zero at the | |
1250 // start of the pause and is updated during the pause if marking | |
1251 // is in progress. | |
1252 other_time_ms -= _cur_satb_drain_time_ms; | |
1253 | |
4837
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1254 // Subtract the root region scanning wait time. It's initialized to |
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1255 // zero at the start of the pause. |
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|
1256 other_time_ms -= _root_region_scan_wait_time_ms; |
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1257 |
4023 | 1258 if (parallel) { |
1259 other_time_ms -= _cur_collection_par_time_ms; | |
1260 } else { | |
1261 other_time_ms -= known_time; | |
1262 } | |
1263 | |
5986
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|
1264 // Now subtract the time taken to fix up roots in generated code |
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|
1265 other_time_ms -= _cur_collection_code_root_fixup_time_ms; |
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|
1266 |
4023 | 1267 // Subtract the time taken to clean the card table from the |
1268 // current value of "other time" | |
1269 other_time_ms -= _cur_clear_ct_time_ms; | |
1270 | |
4097
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1271 // Subtract the time spent completing marking in the collection |
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1272 // set. Note if marking is not in progress during the pause |
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1273 // the value of _mark_closure_time_ms will be zero. |
dc467e8b2c5e
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|
1274 other_time_ms -= _mark_closure_time_ms; |
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|
1275 |
4023 | 1276 // TraceGen0Time and TraceGen1Time summary info updating. |
1277 _all_pause_times_ms->add(elapsed_ms); | |
3823
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|
1278 |
595
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diff
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|
1279 if (update_stats) { |
4023 | 1280 _summary->record_total_time_ms(elapsed_ms); |
1281 _summary->record_other_time_ms(other_time_ms); | |
1282 | |
1283 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1284 assert(body_summary != NULL, "should not be null!"); | |
1285 | |
1286 // This will be non-zero iff marking is currently in progress (i.e. | |
1287 // _g1->mark_in_progress() == true) and the currrent pause was not | |
1288 // an initial mark pause. Since the body_summary items are NumberSeqs, | |
1289 // however, they have to be consistent and updated in lock-step with | |
1290 // each other. Therefore we unconditionally record the SATB drain | |
1291 // time - even if it's zero. | |
1292 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
4837
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1293 body_summary->record_root_region_scan_wait_time_ms( |
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1294 _root_region_scan_wait_time_ms); |
3823
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|
1295 |
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|
1296 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
4787
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|
1297 body_summary->record_satb_filtering_time_ms(satb_filtering_time); |
3823
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1298 body_summary->record_update_rs_time_ms(update_rs_time); |
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|
1299 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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|
1300 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1301 |
3823
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|
1302 if (parallel) { |
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|
1303 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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|
1304 body_summary->record_termination_time_ms(termination_time); |
4023 | 1305 |
1306 double parallel_known_time = known_time + termination_time; | |
1307 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
3823
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|
1308 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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|
1309 } |
4023 | 1310 |
3823
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|
1311 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
4023 | 1312 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
3823
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|
1313 |
342 | 1314 // We exempt parallel collection from this check because Alloc Buffer |
1315 // fragmentation can produce negative collections. Same with evac | |
1316 // failure. | |
1317 // Further, we're now always doing parallel collection. But I'm still | |
1318 // leaving this here as a placeholder for a more precise assertion later. | |
1319 // (DLD, 10/05. | |
1320 assert((true || parallel) | |
1321 || _g1->evacuation_failed() | |
1322 || surviving_bytes <= _collection_set_bytes_used_before, | |
1323 "Or else negative collection!"); | |
4023 | 1324 |
342 | 1325 // this is where we update the allocation rate of the application |
1326 double app_time_ms = | |
1327 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1328 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1329 // This usually happens due to the timer not having the required | |
1330 // granularity. Some Linuxes are the usual culprits. | |
1331 // We'll just set it to something (arbitrarily) small. | |
1332 app_time_ms = 1.0; | |
1333 } | |
4090
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1334 // We maintain the invariant that all objects allocated by mutator |
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1335 // threads will be allocated out of eden regions. So, we can use |
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1336 // the eden region number allocated since the previous GC to |
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1337 // calculate the application's allocate rate. The only exception |
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1338 // to that is humongous objects that are allocated separately. But |
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1339 // given that humongous object allocations do not really affect |
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1340 // either the pause's duration nor when the next pause will take |
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1341 // place we can safely ignore them here. |
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1342 size_t regions_allocated = eden_cset_region_length(); |
342 | 1343 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
1344 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1345 | |
1346 double interval_ms = | |
1347 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1348 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1349 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1350 if (recent_avg_pause_time_ratio() < 0.0 || |
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1351 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1352 #ifndef PRODUCT |
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1353 // Dump info to allow post-facto debugging |
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1354 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1355 gclog_or_tty->print_cr("-------------------------------------------"); |
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1356 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1357 _recent_gc_times_ms->dump(); |
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1358 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1359 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1360 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1361 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
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1362 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1363 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1364 #endif // !PRODUCT |
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1365 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1366 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1367 if (_recent_avg_pause_time_ratio < 0.0) { |
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1368 _recent_avg_pause_time_ratio = 0.0; |
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1369 } else { |
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1370 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1371 _recent_avg_pause_time_ratio = 1.0; |
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1372 } |
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1373 } |
342 | 1374 } |
1375 | |
4023 | 1376 for (int i = 0; i < _aux_num; ++i) { |
1377 if (_cur_aux_times_set[i]) { | |
1378 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1379 } | |
1380 } | |
1381 | |
1382 // PrintGCDetails output | |
342 | 1383 if (PrintGCDetails) { |
4023 | 1384 bool print_marking_info = |
1385 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1386 | |
1707 | 1387 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1388 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1389 elapsed_ms / 1000.0); | |
1390 | |
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1391 if (_root_region_scan_wait_time_ms > 0.0) { |
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1392 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms); |
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1393 } |
1707 | 1394 if (parallel) { |
1395 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1396 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1397 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1398 if (print_marking_info) { | |
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1399 print_par_stats(2, "SATB Filtering", _par_last_satb_filtering_times_ms); |
4023 | 1400 } |
1707 | 1401 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1402 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1707 | 1403 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1404 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1405 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1406 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1407 | |
1408 for (int i = 0; i < _parallel_gc_threads; i++) { | |
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1409 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - |
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1410 _par_last_gc_worker_start_times_ms[i]; |
4023 | 1411 |
1412 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
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1413 _par_last_satb_filtering_times_ms[i] + |
4023 | 1414 _par_last_update_rs_times_ms[i] + |
1415 _par_last_scan_rs_times_ms[i] + | |
1416 _par_last_obj_copy_times_ms[i] + | |
1417 _par_last_termination_times_ms[i]; | |
1418 | |
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1419 _par_last_gc_worker_other_times_ms[i] = _par_last_gc_worker_times_ms[i] - |
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1420 worker_known_time; |
2430 | 1421 } |
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1422 |
4023 | 1423 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); |
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1424 print_par_stats(2, "GC Worker Total", _par_last_gc_worker_times_ms); |
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1425 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
1707 | 1426 } else { |
4023 | 1427 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1428 if (print_marking_info) { | |
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1429 print_stats(1, "SATB Filtering", satb_filtering_time); |
4023 | 1430 } |
1707 | 1431 print_stats(1, "Update RS", update_rs_time); |
4023 | 1432 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
1707 | 1433 print_stats(1, "Scan RS", scan_rs_time); |
1434 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1435 } |
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1436 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms); |
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1437 if (print_marking_info) { |
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1438 print_stats(1, "Complete CSet Marking", _mark_closure_time_ms); |
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1439 } |
4023 | 1440 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
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1441 #ifndef PRODUCT |
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1442 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1443 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1444 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1445 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1446 if (_num_cc_clears > 0) { |
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1447 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1448 } |
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1449 #endif |
342 | 1450 print_stats(1, "Other", other_time_ms); |
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1451 print_stats(2, "Choose CSet", |
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1452 (_recorded_young_cset_choice_time_ms + |
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1453 _recorded_non_young_cset_choice_time_ms)); |
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1454 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1455 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1456 print_stats(2, "Free CSet", |
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1457 (_recorded_young_free_cset_time_ms + |
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1458 _recorded_non_young_free_cset_time_ms)); |
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1459 |
342 | 1460 for (int i = 0; i < _aux_num; ++i) { |
1461 if (_cur_aux_times_set[i]) { | |
1462 char buffer[96]; | |
1463 sprintf(buffer, "Aux%d", i); | |
1464 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1465 } | |
1466 } | |
1467 } | |
1468 | |
1469 // Update the efficiency-since-mark vars. | |
1470 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1471 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1472 // This usually happens due to the timer not having the required | |
1473 // granularity. Some Linuxes are the usual culprits. | |
1474 // We'll just set it to something (arbitrarily) small. | |
1475 proc_ms = 1.0; | |
1476 } | |
1477 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1478 | |
1479 bool new_in_marking_window = _in_marking_window; | |
1480 bool new_in_marking_window_im = false; | |
1359
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1481 if (during_initial_mark_pause()) { |
342 | 1482 new_in_marking_window = true; |
1483 new_in_marking_window_im = true; | |
1484 } | |
1485 | |
4710 | 1486 if (_last_young_gc) { |
4912
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1487 // This is supposed to to be the "last young GC" before we start |
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1488 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1489 |
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1490 if (!last_pause_included_initial_mark) { |
4912
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1491 if (next_gc_should_be_mixed("start mixed GCs", |
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1492 "do not start mixed GCs")) { |
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1493 set_gcs_are_young(false); |
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1494 } |
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1495 } else { |
4710 | 1496 ergo_verbose0(ErgoMixedGCs, |
1497 "do not start mixed GCs", | |
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1498 ergo_format_reason("concurrent cycle is about to start")); |
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1499 } |
4710 | 1500 _last_young_gc = false; |
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1501 } |
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1502 |
4710 | 1503 if (!_last_gc_was_young) { |
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1504 // This is a mixed GC. Here we decide whether to continue doing |
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1505 // mixed GCs or not. |
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1506 |
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1507 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1508 "do not continue mixed GCs")) { |
4710 | 1509 set_gcs_are_young(true); |
342 | 1510 } |
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1511 } |
4710 | 1512 |
1513 if (_last_gc_was_young && !_during_marking) { | |
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1514 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1515 } |
1516 | |
1517 _short_lived_surv_rate_group->start_adding_regions(); | |
1518 // do that for any other surv rate groupsx | |
1519 | |
677 | 1520 if (update_stats) { |
342 | 1521 double pause_time_ms = elapsed_ms; |
1522 | |
1523 size_t diff = 0; | |
1524 if (_max_pending_cards >= _pending_cards) | |
1525 diff = _max_pending_cards - _pending_cards; | |
1526 _pending_card_diff_seq->add((double) diff); | |
1527 | |
1528 double cost_per_card_ms = 0.0; | |
1529 if (_pending_cards > 0) { | |
1530 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1531 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1532 } | |
1533 | |
1534 size_t cards_scanned = _g1->cards_scanned(); | |
1535 | |
1536 double cost_per_entry_ms = 0.0; | |
1537 if (cards_scanned > 10) { | |
1538 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
4710 | 1539 if (_last_gc_was_young) { |
342 | 1540 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1541 } else { |
1542 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1543 } | |
342 | 1544 } |
1545 | |
1546 if (_max_rs_lengths > 0) { | |
1547 double cards_per_entry_ratio = | |
1548 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1549 if (_last_gc_was_young) { |
1550 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1551 } else { | |
1552 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1553 } | |
342 | 1554 } |
1555 | |
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1556 // This is defensive. For a while _max_rs_lengths could get |
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1557 // smaller than _recorded_rs_lengths which was causing |
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1558 // rs_length_diff to get very large and mess up the RSet length |
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1559 // predictions. The reason was unsafe concurrent updates to the |
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1560 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1561 // against (see CR 7118202). This bug has now been fixed (see CR |
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1562 // 7119027). However, I'm still worried that |
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1563 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1564 // inaccurate. The concurrent refinement thread calculates an |
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1565 // RSet's length concurrently with other CR threads updating it |
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1566 // which might cause it to calculate the length incorrectly (if, |
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1567 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1568 // conditional below just in case. |
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1569 size_t rs_length_diff = 0; |
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1570 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1571 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1572 } |
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1573 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1574 |
1575 size_t copied_bytes = surviving_bytes; | |
1576 double cost_per_byte_ms = 0.0; | |
1577 if (copied_bytes > 0) { | |
1578 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
4710 | 1579 if (_in_marking_window) { |
342 | 1580 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1581 } else { |
342 | 1582 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1583 } |
342 | 1584 } |
1585 | |
1586 double all_other_time_ms = pause_time_ms - | |
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1587 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1588 _mark_closure_time_ms + termination_time); |
1589 | |
1590 double young_other_time_ms = 0.0; | |
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1591 if (young_cset_region_length() > 0) { |
342 | 1592 young_other_time_ms = |
1593 _recorded_young_cset_choice_time_ms + | |
1594 _recorded_young_free_cset_time_ms; | |
1595 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1596 (double) young_cset_region_length()); |
342 | 1597 } |
1598 double non_young_other_time_ms = 0.0; | |
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1599 if (old_cset_region_length() > 0) { |
342 | 1600 non_young_other_time_ms = |
1601 _recorded_non_young_cset_choice_time_ms + | |
1602 _recorded_non_young_free_cset_time_ms; | |
1603 | |
1604 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1605 (double) old_cset_region_length()); |
342 | 1606 } |
1607 | |
1608 double constant_other_time_ms = all_other_time_ms - | |
1609 (young_other_time_ms + non_young_other_time_ms); | |
1610 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1611 | |
1612 double survival_ratio = 0.0; | |
1613 if (_bytes_in_collection_set_before_gc > 0) { | |
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1614 survival_ratio = (double) _bytes_copied_during_gc / |
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1615 (double) _bytes_in_collection_set_before_gc; |
342 | 1616 } |
1617 | |
1618 _pending_cards_seq->add((double) _pending_cards); | |
1619 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1620 } | |
1621 | |
1622 _in_marking_window = new_in_marking_window; | |
1623 _in_marking_window_im = new_in_marking_window_im; | |
1624 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1625 update_young_list_target_length(); |
342 | 1626 |
1111 | 1627 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1628 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1629 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1630 |
1631 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1632 } |
1633 | |
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1634 #define EXT_SIZE_FORMAT "%d%s" |
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1635 #define EXT_SIZE_PARAMS(bytes) \ |
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1636 byte_size_in_proper_unit((bytes)), \ |
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1637 proper_unit_for_byte_size((bytes)) |
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1638 |
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1639 void G1CollectorPolicy::print_heap_transition() { |
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1640 if (PrintGCDetails) { |
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1641 YoungList* young_list = _g1->young_list(); |
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1642 size_t eden_bytes = young_list->eden_used_bytes(); |
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1643 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1644 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1645 size_t used = _g1->used(); |
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1646 size_t capacity = _g1->capacity(); |
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1647 size_t eden_capacity = |
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1648 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1649 |
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1650 gclog_or_tty->print_cr( |
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1651 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1652 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1653 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1654 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1655 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1656 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1657 EXT_SIZE_PARAMS(eden_bytes), |
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1658 EXT_SIZE_PARAMS(eden_capacity), |
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1659 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1660 EXT_SIZE_PARAMS(survivor_bytes), |
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1661 EXT_SIZE_PARAMS(used_before_gc), |
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1662 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1663 EXT_SIZE_PARAMS(used), |
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1664 EXT_SIZE_PARAMS(capacity)); |
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1665 |
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1666 _prev_eden_capacity = eden_capacity; |
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1667 } else if (PrintGC) { |
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1668 _g1->print_size_transition(gclog_or_tty, |
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1669 _cur_collection_pause_used_at_start_bytes, |
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1670 _g1->used(), _g1->capacity()); |
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1671 } |
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1672 } |
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1673 |
1111 | 1674 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1675 double update_rs_processed_buffers, | |
1676 double goal_ms) { | |
1677 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1678 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1679 | |
1282 | 1680 if (G1UseAdaptiveConcRefinement) { |
1111 | 1681 const int k_gy = 3, k_gr = 6; |
1682 const double inc_k = 1.1, dec_k = 0.9; | |
1683 | |
1684 int g = cg1r->green_zone(); | |
1685 if (update_rs_time > goal_ms) { | |
1686 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1687 } else { | |
1688 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1689 g = (int)MAX2(g * inc_k, g + 1.0); | |
1690 } | |
1691 } | |
1692 // Change the refinement threads params | |
1693 cg1r->set_green_zone(g); | |
1694 cg1r->set_yellow_zone(g * k_gy); | |
1695 cg1r->set_red_zone(g * k_gr); | |
1696 cg1r->reinitialize_threads(); | |
1697 | |
1698 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1699 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1700 cg1r->yellow_zone()); | |
1701 // Change the barrier params | |
1702 dcqs.set_process_completed_threshold(processing_threshold); | |
1703 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1704 } | |
1705 | |
1706 int curr_queue_size = dcqs.completed_buffers_num(); | |
1707 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1708 dcqs.set_completed_queue_padding(curr_queue_size); | |
1709 } else { | |
1710 dcqs.set_completed_queue_padding(0); | |
1711 } | |
1712 dcqs.notify_if_necessary(); | |
1713 } | |
1714 | |
342 | 1715 double |
1716 G1CollectorPolicy:: | |
1717 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1718 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1719 | |
1720 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1721 size_t young_num = g1h->young_list()->length(); |
342 | 1722 if (young_num == 0) |
1723 return 0.0; | |
1724 | |
1725 young_num += adjustment; | |
1726 size_t pending_cards = predict_pending_cards(); | |
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1727 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1728 predict_rs_length_diff(); |
1729 size_t card_num; | |
4710 | 1730 if (gcs_are_young()) { |
342 | 1731 card_num = predict_young_card_num(rs_lengths); |
4710 | 1732 } else { |
342 | 1733 card_num = predict_non_young_card_num(rs_lengths); |
4710 | 1734 } |
342 | 1735 size_t young_byte_size = young_num * HeapRegion::GrainBytes; |
1736 double accum_yg_surv_rate = | |
1737 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1738 | |
1739 size_t bytes_to_copy = | |
1740 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1741 | |
1742 return | |
1743 predict_rs_update_time_ms(pending_cards) + | |
1744 predict_rs_scan_time_ms(card_num) + | |
1745 predict_object_copy_time_ms(bytes_to_copy) + | |
1746 predict_young_other_time_ms(young_num) + | |
1747 predict_constant_other_time_ms(); | |
1748 } | |
1749 | |
1750 double | |
1751 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1752 size_t rs_length = predict_rs_length_diff(); | |
1753 size_t card_num; | |
4710 | 1754 if (gcs_are_young()) { |
342 | 1755 card_num = predict_young_card_num(rs_length); |
4710 | 1756 } else { |
342 | 1757 card_num = predict_non_young_card_num(rs_length); |
4710 | 1758 } |
342 | 1759 return predict_base_elapsed_time_ms(pending_cards, card_num); |
1760 } | |
1761 | |
1762 double | |
1763 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1764 size_t scanned_cards) { | |
1765 return | |
1766 predict_rs_update_time_ms(pending_cards) + | |
1767 predict_rs_scan_time_ms(scanned_cards) + | |
1768 predict_constant_other_time_ms(); | |
1769 } | |
1770 | |
1771 double | |
1772 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1773 bool young) { | |
1774 size_t rs_length = hr->rem_set()->occupied(); | |
1775 size_t card_num; | |
4710 | 1776 if (gcs_are_young()) { |
342 | 1777 card_num = predict_young_card_num(rs_length); |
4710 | 1778 } else { |
342 | 1779 card_num = predict_non_young_card_num(rs_length); |
4710 | 1780 } |
342 | 1781 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1782 | |
1783 double region_elapsed_time_ms = | |
1784 predict_rs_scan_time_ms(card_num) + | |
1785 predict_object_copy_time_ms(bytes_to_copy); | |
1786 | |
1787 if (young) | |
1788 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1789 else | |
1790 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1791 | |
1792 return region_elapsed_time_ms; | |
1793 } | |
1794 | |
1795 size_t | |
1796 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1797 size_t bytes_to_copy; | |
1798 if (hr->is_marked()) | |
1799 bytes_to_copy = hr->max_live_bytes(); | |
1800 else { | |
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1801 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1802 int age = hr->age_in_surv_rate_group(); |
545 | 1803 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1804 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1805 } | |
1806 return bytes_to_copy; | |
1807 } | |
1808 | |
1809 void | |
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1810 G1CollectorPolicy::init_cset_region_lengths(size_t eden_cset_region_length, |
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1811 size_t survivor_cset_region_length) { |
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1812 _eden_cset_region_length = eden_cset_region_length; |
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1813 _survivor_cset_region_length = survivor_cset_region_length; |
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1814 _old_cset_region_length = 0; |
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1815 } |
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1816 |
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1817 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1818 _recorded_rs_lengths = rs_lengths; |
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1819 } |
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1820 |
342 | 1821 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1822 double elapsed_ms) { | |
1823 _recent_gc_times_ms->add(elapsed_ms); | |
1824 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1825 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1826 } | |
1827 | |
1828 size_t G1CollectorPolicy::expansion_amount() { | |
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1829 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1830 double threshold = _gc_overhead_perc; |
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1831 if (recent_gc_overhead > threshold) { |
751 | 1832 // We will double the existing space, or take |
1833 // G1ExpandByPercentOfAvailable % of the available expansion | |
1834 // space, whichever is smaller, bounded below by a minimum | |
1835 // expansion (unless that's all that's left.) | |
342 | 1836 const size_t min_expand_bytes = 1*M; |
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1837 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1838 size_t committed_bytes = _g1->capacity(); |
1839 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1840 size_t expand_bytes; | |
1841 size_t expand_bytes_via_pct = | |
751 | 1842 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1843 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1844 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1845 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1846 |
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1847 ergo_verbose5(ErgoHeapSizing, |
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1848 "attempt heap expansion", |
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1849 ergo_format_reason("recent GC overhead higher than " |
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1850 "threshold after GC") |
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1851 ergo_format_perc("recent GC overhead") |
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1852 ergo_format_perc("threshold") |
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1853 ergo_format_byte("uncommitted") |
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1854 ergo_format_byte_perc("calculated expansion amount"), |
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1855 recent_gc_overhead, threshold, |
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1856 uncommitted_bytes, |
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1857 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1858 |
342 | 1859 return expand_bytes; |
1860 } else { | |
1861 return 0; | |
1862 } | |
1863 } | |
1864 | |
1865 class CountCSClosure: public HeapRegionClosure { | |
1866 G1CollectorPolicy* _g1_policy; | |
1867 public: | |
1868 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1869 _g1_policy(g1_policy) {} | |
1870 bool doHeapRegion(HeapRegion* r) { | |
1871 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1872 return false; | |
1873 } | |
1874 }; | |
1875 | |
1876 void G1CollectorPolicy::count_CS_bytes_used() { | |
1877 CountCSClosure cs_closure(this); | |
1878 _g1->collection_set_iterate(&cs_closure); | |
1879 } | |
1880 | |
4023 | 1881 void G1CollectorPolicy::print_summary(int level, |
1882 const char* str, | |
1883 NumberSeq* seq) const { | |
342 | 1884 double sum = seq->sum(); |
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1885 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1886 str, sum / 1000.0, seq->avg()); |
1887 } | |
1888 | |
4023 | 1889 void G1CollectorPolicy::print_summary_sd(int level, |
1890 const char* str, | |
1891 NumberSeq* seq) const { | |
342 | 1892 print_summary(level, str, seq); |
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1893 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1894 seq->num(), seq->sd(), seq->maximum()); |
1895 } | |
1896 | |
1897 void G1CollectorPolicy::check_other_times(int level, | |
1898 NumberSeq* other_times_ms, | |
1899 NumberSeq* calc_other_times_ms) const { | |
1900 bool should_print = false; | |
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1901 LineBuffer buf(level + 2); |
342 | 1902 |
1903 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1904 fabs(calc_other_times_ms->sum())); | |
1905 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1906 fabs(calc_other_times_ms->sum())); | |
1907 double sum_ratio = max_sum / min_sum; | |
1908 if (sum_ratio > 1.1) { | |
1909 should_print = true; | |
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1910 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1911 } |
1912 | |
1913 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1914 fabs(calc_other_times_ms->avg())); | |
1915 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1916 fabs(calc_other_times_ms->avg())); | |
1917 double avg_ratio = max_avg / min_avg; | |
1918 if (avg_ratio > 1.1) { | |
1919 should_print = true; | |
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1920 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1921 } |
1922 | |
1923 if (other_times_ms->sum() < -0.01) { | |
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1924 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1925 } |
1926 | |
1927 if (other_times_ms->avg() < -0.01) { | |
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1928 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1929 } |
1930 | |
1931 if (calc_other_times_ms->sum() < -0.01) { | |
1932 should_print = true; | |
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1933 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1934 } |
1935 | |
1936 if (calc_other_times_ms->avg() < -0.01) { | |
1937 should_print = true; | |
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1938 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1939 } |
1940 | |
1941 if (should_print) | |
1942 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1943 } | |
1944 | |
1945 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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1946 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1947 MainBodySummary* body_summary = summary->main_body_summary(); |
1948 if (summary->get_total_seq()->num() > 0) { | |
677 | 1949 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1950 if (body_summary != NULL) { |
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1951 print_summary(1, "Root Region Scan Wait", body_summary->get_root_region_scan_wait_seq()); |
342 | 1952 if (parallel) { |
1953 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 1954 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1955 print_summary(2, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1956 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
1957 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
1958 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
1959 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 1960 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 1961 { |
1962 NumberSeq* other_parts[] = { | |
1963 body_summary->get_ext_root_scan_seq(), | |
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1964 body_summary->get_satb_filtering_seq(), |
4023 | 1965 body_summary->get_update_rs_seq(), |
342 | 1966 body_summary->get_scan_rs_seq(), |
1967 body_summary->get_obj_copy_seq(), | |
1968 body_summary->get_termination_seq() | |
1969 }; | |
1970 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 1971 6, other_parts); |
342 | 1972 check_other_times(2, body_summary->get_parallel_other_seq(), |
1973 &calc_other_times_ms); | |
1974 } | |
1975 } else { | |
4023 | 1976 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1977 print_summary(1, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1978 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
1979 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
1980 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
1981 } | |
1982 } | |
4023 | 1983 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
1984 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
342 | 1985 print_summary(1, "Other", summary->get_other_seq()); |
1986 { | |
1779 | 1987 if (body_summary != NULL) { |
1988 NumberSeq calc_other_times_ms; | |
1989 if (parallel) { | |
1990 // parallel | |
1991 NumberSeq* other_parts[] = { | |
1992 body_summary->get_satb_drain_seq(), | |
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1993 body_summary->get_root_region_scan_wait_seq(), |
1779 | 1994 body_summary->get_parallel_seq(), |
1995 body_summary->get_clear_ct_seq() | |
1996 }; | |
1997 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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1998 4, other_parts); |
1779 | 1999 } else { |
2000 // serial | |
2001 NumberSeq* other_parts[] = { | |
2002 body_summary->get_satb_drain_seq(), | |
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2003 body_summary->get_root_region_scan_wait_seq(), |
1779 | 2004 body_summary->get_update_rs_seq(), |
2005 body_summary->get_ext_root_scan_seq(), | |
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2006 body_summary->get_satb_filtering_seq(), |
1779 | 2007 body_summary->get_scan_rs_seq(), |
2008 body_summary->get_obj_copy_seq() | |
2009 }; | |
2010 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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2011 7, other_parts); |
1779 | 2012 } |
2013 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2014 } |
2015 } | |
2016 } else { | |
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2017 LineBuffer(1).append_and_print_cr("none"); |
342 | 2018 } |
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2019 LineBuffer(0).append_and_print_cr(""); |
342 | 2020 } |
2021 | |
2022 void G1CollectorPolicy::print_tracing_info() const { | |
2023 if (TraceGen0Time) { | |
2024 gclog_or_tty->print_cr("ALL PAUSES"); | |
2025 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2026 gclog_or_tty->print_cr(""); | |
2027 gclog_or_tty->print_cr(""); | |
4710 | 2028 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
2029 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); | |
342 | 2030 gclog_or_tty->print_cr(""); |
2031 | |
677 | 2032 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2033 print_summary(_summary); | |
342 | 2034 |
2035 gclog_or_tty->print_cr("MISC"); | |
2036 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2037 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2038 for (int i = 0; i < _aux_num; ++i) { | |
2039 if (_all_aux_times_ms[i].num() > 0) { | |
2040 char buffer[96]; | |
2041 sprintf(buffer, "Aux%d", i); | |
2042 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2043 } | |
2044 } | |
2045 } | |
2046 if (TraceGen1Time) { | |
2047 if (_all_full_gc_times_ms->num() > 0) { | |
2048 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2049 _all_full_gc_times_ms->num(), | |
2050 _all_full_gc_times_ms->sum() / 1000.0); | |
2051 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2052 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2053 _all_full_gc_times_ms->sd(), | |
2054 _all_full_gc_times_ms->maximum()); | |
2055 } | |
2056 } | |
2057 } | |
2058 | |
2059 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2060 #ifndef PRODUCT | |
2061 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2062 // add this call for any other surv rate groups | |
2063 #endif // PRODUCT | |
2064 } | |
2065 | |
2066 #ifndef PRODUCT | |
2067 // for debugging, bit of a hack... | |
2068 static char* | |
2069 region_num_to_mbs(int length) { | |
2070 static char buffer[64]; | |
2071 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2072 double mbs = bytes / (double) (1024 * 1024); | |
2073 sprintf(buffer, "%7.2lfMB", mbs); | |
2074 return buffer; | |
2075 } | |
2076 #endif // PRODUCT | |
2077 | |
545 | 2078 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2079 switch (purpose) { |
2080 case GCAllocForSurvived: | |
545 | 2081 return _max_survivor_regions; |
342 | 2082 case GCAllocForTenured: |
545 | 2083 return REGIONS_UNLIMITED; |
342 | 2084 default: |
545 | 2085 ShouldNotReachHere(); |
2086 return REGIONS_UNLIMITED; | |
342 | 2087 }; |
2088 } | |
2089 | |
3919
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2090 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
1991
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2091 size_t expansion_region_num = 0; |
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2092 if (GCLockerEdenExpansionPercent > 0) { |
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2093 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2094 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2095 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2096 // less than 1.0) we'll get 1. |
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2097 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2098 } else { |
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2099 assert(expansion_region_num == 0, "sanity"); |
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2100 } |
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2101 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2102 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2103 } |
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2104 |
545 | 2105 // Calculates survivor space parameters. |
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2106 void G1CollectorPolicy::update_survivors_policy() { |
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2107 double max_survivor_regions_d = |
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2108 (double) _young_list_target_length / (double) SurvivorRatio; |
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2109 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2110 // smaller than 1.0) we'll get 1. |
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2111 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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2112 |
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2113 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2114 HeapRegion::GrainWords * _max_survivor_regions); |
2115 } | |
2116 | |
342 | 2117 #ifndef PRODUCT |
2118 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2119 CollectionSetChooser* _chooser; | |
2120 public: | |
2121 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2122 _chooser(chooser) {} | |
2123 | |
2124 bool doHeapRegion(HeapRegion* r) { | |
2125 if (!r->continuesHumongous()) { | |
2126 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2127 } | |
2128 return false; | |
2129 } | |
2130 }; | |
2131 | |
4013 | 2132 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2133 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2134 _g1->heap_region_iterate(&cl); | |
2135 return true; | |
2136 } | |
2137 #endif | |
2138 | |
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2139 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2140 GCCause::Cause gc_cause) { |
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2141 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2142 if (!during_cycle) { |
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2143 ergo_verbose1(ErgoConcCycles, |
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2144 "request concurrent cycle initiation", |
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2145 ergo_format_reason("requested by GC cause") |
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2146 ergo_format_str("GC cause"), |
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2147 GCCause::to_string(gc_cause)); |
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2148 set_initiate_conc_mark_if_possible(); |
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2149 return true; |
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2150 } else { |
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2151 ergo_verbose1(ErgoConcCycles, |
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2152 "do not request concurrent cycle initiation", |
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2153 ergo_format_reason("concurrent cycle already in progress") |
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2154 ergo_format_str("GC cause"), |
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2155 GCCause::to_string(gc_cause)); |
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2156 return false; |
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2157 } |
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2158 } |
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2159 |
342 | 2160 void |
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2161 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2162 // We are about to decide on whether this pause will be an |
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2163 // initial-mark pause. |
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2164 |
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2165 // First, during_initial_mark_pause() should not be already set. We |
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2166 // will set it here if we have to. However, it should be cleared by |
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2167 // the end of the pause (it's only set for the duration of an |
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2168 // initial-mark pause). |
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2169 assert(!during_initial_mark_pause(), "pre-condition"); |
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2170 |
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2171 if (initiate_conc_mark_if_possible()) { |
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2172 // We had noticed on a previous pause that the heap occupancy has |
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2173 // gone over the initiating threshold and we should start a |
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2174 // concurrent marking cycle. So we might initiate one. |
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2175 |
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2176 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2177 if (!during_cycle) { |
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2178 // The concurrent marking thread is not "during a cycle", i.e., |
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2179 // it has completed the last one. So we can go ahead and |
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2180 // initiate a new cycle. |
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2181 |
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2182 set_during_initial_mark_pause(); |
4710 | 2183 // We do not allow mixed GCs during marking. |
2184 if (!gcs_are_young()) { | |
2185 set_gcs_are_young(true); | |
2186 ergo_verbose0(ErgoMixedGCs, | |
2187 "end mixed GCs", | |
3982
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|
2188 ergo_format_reason("concurrent cycle is about to start")); |
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2189 } |
1359
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2190 |
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2191 // And we can now clear initiate_conc_mark_if_possible() as |
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2192 // we've already acted on it. |
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2193 clear_initiate_conc_mark_if_possible(); |
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2194 |
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2195 ergo_verbose0(ErgoConcCycles, |
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2196 "initiate concurrent cycle", |
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2197 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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2198 } else { |
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2199 // The concurrent marking thread is still finishing up the |
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2200 // previous cycle. If we start one right now the two cycles |
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2201 // overlap. In particular, the concurrent marking thread might |
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2202 // be in the process of clearing the next marking bitmap (which |
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2203 // we will use for the next cycle if we start one). Starting a |
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2204 // cycle now will be bad given that parts of the marking |
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2205 // information might get cleared by the marking thread. And we |
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2206 // cannot wait for the marking thread to finish the cycle as it |
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2207 // periodically yields while clearing the next marking bitmap |
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2208 // and, if it's in a yield point, it's waiting for us to |
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2209 // finish. So, at this point we will not start a cycle and we'll |
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2210 // let the concurrent marking thread complete the last one. |
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2211 ergo_verbose0(ErgoConcCycles, |
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2212 "do not initiate concurrent cycle", |
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2213 ergo_format_reason("concurrent cycle already in progress")); |
1359
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2214 } |
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2215 } |
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2216 } |
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2217 |
342 | 2218 class KnownGarbageClosure: public HeapRegionClosure { |
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2219 G1CollectedHeap* _g1h; |
342 | 2220 CollectionSetChooser* _hrSorted; |
2221 | |
2222 public: | |
2223 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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2224 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 2225 |
2226 bool doHeapRegion(HeapRegion* r) { | |
2227 // We only include humongous regions in collection | |
2228 // sets when concurrent mark shows that their contained object is | |
2229 // unreachable. | |
2230 | |
2231 // Do we have any marking information for this region? | |
2232 if (r->is_marked()) { | |
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2233 // We will skip any region that's currently used as an old GC |
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2234 // alloc region (we should not consider those for collection |
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2235 // before we fill them up). |
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2236 if (_hrSorted->shouldAdd(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 2237 _hrSorted->addMarkedHeapRegion(r); |
2238 } | |
2239 } | |
2240 return false; | |
2241 } | |
2242 }; | |
2243 | |
2244 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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2245 G1CollectedHeap* _g1h; |
342 | 2246 CollectionSetChooser* _hrSorted; |
2247 jint _marked_regions_added; | |
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2248 size_t _reclaimable_bytes_added; |
342 | 2249 jint _chunk_size; |
2250 jint _cur_chunk_idx; | |
2251 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2252 int _worker; | |
2253 int _invokes; | |
2254 | |
2255 void get_new_chunk() { | |
2256 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2257 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2258 } | |
2259 void add_region(HeapRegion* r) { | |
2260 if (_cur_chunk_idx == _cur_chunk_end) { | |
2261 get_new_chunk(); | |
2262 } | |
2263 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2264 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2265 _marked_regions_added++; | |
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2266 _reclaimable_bytes_added += r->reclaimable_bytes(); |
342 | 2267 _cur_chunk_idx++; |
2268 } | |
2269 | |
2270 public: | |
2271 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2272 jint chunk_size, | |
2273 int worker) : | |
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2274 _g1h(G1CollectedHeap::heap()), |
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2275 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), |
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2276 _marked_regions_added(0), _reclaimable_bytes_added(0), |
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2277 _cur_chunk_idx(0), _cur_chunk_end(0), _invokes(0) { } |
342 | 2278 |
2279 bool doHeapRegion(HeapRegion* r) { | |
2280 // We only include humongous regions in collection | |
2281 // sets when concurrent mark shows that their contained object is | |
2282 // unreachable. | |
2283 _invokes++; | |
2284 | |
2285 // Do we have any marking information for this region? | |
2286 if (r->is_marked()) { | |
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2287 // We will skip any region that's currently used as an old GC |
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2288 // alloc region (we should not consider those for collection |
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2289 // before we fill them up). |
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2290 if (_hrSorted->shouldAdd(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 2291 add_region(r); |
2292 } | |
2293 } | |
2294 return false; | |
2295 } | |
2296 jint marked_regions_added() { return _marked_regions_added; } | |
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2297 size_t reclaimable_bytes_added() { return _reclaimable_bytes_added; } |
342 | 2298 int invokes() { return _invokes; } |
2299 }; | |
2300 | |
2301 class ParKnownGarbageTask: public AbstractGangTask { | |
2302 CollectionSetChooser* _hrSorted; | |
2303 jint _chunk_size; | |
2304 G1CollectedHeap* _g1; | |
2305 public: | |
2306 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2307 AbstractGangTask("ParKnownGarbageTask"), | |
2308 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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2309 _g1(G1CollectedHeap::heap()) { } |
342 | 2310 |
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2311 void work(uint worker_id) { |
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2312 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, |
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2313 _chunk_size, |
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2314 worker_id); |
342 | 2315 // Back to zero for the claim value. |
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2316 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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2317 _g1->workers()->active_workers(), |
355 | 2318 HeapRegion::InitialClaimValue); |
342 | 2319 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
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2320 size_t reclaimable_bytes_added = |
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2321 parKnownGarbageCl.reclaimable_bytes_added(); |
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2322 _hrSorted->updateTotals(regions_added, reclaimable_bytes_added); |
342 | 2323 if (G1PrintParCleanupStats) { |
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2324 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
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2325 worker_id, parKnownGarbageCl.invokes(), regions_added); |
342 | 2326 } |
2327 } | |
2328 }; | |
2329 | |
2330 void | |
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2331 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
4013 | 2332 double start_sec; |
2333 if (G1PrintParCleanupStats) { | |
2334 start_sec = os::elapsedTime(); | |
2335 } | |
342 | 2336 |
2337 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2338 double clear_marked_end_sec; |
342 | 2339 if (G1PrintParCleanupStats) { |
4013 | 2340 clear_marked_end_sec = os::elapsedTime(); |
2341 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2342 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2343 } |
4013 | 2344 |
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2345 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2346 const size_t OverpartitionFactor = 4; |
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2347 size_t WorkUnit; |
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2348 // The use of MinChunkSize = 8 in the original code |
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2349 // causes some assertion failures when the total number of |
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2350 // region is less than 8. The code here tries to fix that. |
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2351 // Should the original code also be fixed? |
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2352 if (no_of_gc_threads > 0) { |
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2353 const size_t MinWorkUnit = |
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2354 MAX2(_g1->n_regions() / no_of_gc_threads, (size_t) 1U); |
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2355 WorkUnit = |
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2356 MAX2(_g1->n_regions() / (no_of_gc_threads * OverpartitionFactor), |
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2357 MinWorkUnit); |
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2358 } else { |
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2359 assert(no_of_gc_threads > 0, |
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2360 "The active gc workers should be greater than 0"); |
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2361 // In a product build do something reasonable to avoid a crash. |
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2362 const size_t MinWorkUnit = |
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2363 MAX2(_g1->n_regions() / ParallelGCThreads, (size_t) 1U); |
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2364 WorkUnit = |
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2365 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2366 MinWorkUnit); |
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2367 } |
342 | 2368 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2369 WorkUnit); |
342 | 2370 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2371 (int) WorkUnit); |
342 | 2372 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2373 |
2374 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2375 "sanity check"); | |
342 | 2376 } else { |
2377 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2378 _g1->heap_region_iterate(&knownGarbagecl); | |
2379 } | |
4013 | 2380 double known_garbage_end_sec; |
342 | 2381 if (G1PrintParCleanupStats) { |
4013 | 2382 known_garbage_end_sec = os::elapsedTime(); |
342 | 2383 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2384 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2385 } |
4013 | 2386 |
342 | 2387 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2388 double end_sec = os::elapsedTime(); |
342 | 2389 if (G1PrintParCleanupStats) { |
2390 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2391 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2392 } |
2393 | |
4013 | 2394 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2395 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2396 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2397 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2398 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2399 } |
2400 | |
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2401 // Add the heap region at the head of the non-incremental collection set |
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2402 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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2403 assert(_inc_cset_build_state == Active, "Precondition"); |
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2404 assert(!hr->is_young(), "non-incremental add of young region"); |
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2405 |
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2406 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2407 hr->set_in_collection_set(true); |
2408 hr->set_next_in_collection_set(_collection_set); | |
2409 _collection_set = hr; | |
2410 _collection_set_bytes_used_before += hr->used(); | |
526 | 2411 _g1->register_region_with_in_cset_fast_test(hr); |
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2412 size_t rs_length = hr->rem_set()->occupied(); |
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2413 _recorded_rs_lengths += rs_length; |
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2414 _old_cset_region_length += 1; |
342 | 2415 } |
2416 | |
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2417 // Initialize the per-collection-set information |
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2418 void G1CollectorPolicy::start_incremental_cset_building() { |
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2419 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2420 |
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2421 _inc_cset_head = NULL; |
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2422 _inc_cset_tail = NULL; |
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2423 _inc_cset_bytes_used_before = 0; |
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2424 |
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2425 _inc_cset_max_finger = 0; |
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2426 _inc_cset_recorded_rs_lengths = 0; |
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2427 _inc_cset_recorded_rs_lengths_diffs = 0; |
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2428 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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2429 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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2430 _inc_cset_build_state = Active; |
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2431 } |
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2432 |
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2433 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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2434 assert(_inc_cset_build_state == Active, "Precondition"); |
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2435 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2436 |
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2437 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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2438 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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|
2439 // that adds a new region to the CSet. Further updates by the |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2440 // concurrent refinement thread that samples the young RSet lengths |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2441 // are accumulated in the *_diffs fields. Here we add the diffs to |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2442 // the "main" fields. |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2443 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2444 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
changeset
|
2445 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2446 } else { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2447 // This is defensive. The diff should in theory be always positive |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2448 // as RSets can only grow between GCs. However, given that we |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2449 // sample their size concurrently with other threads updating them |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2450 // it's possible that we might get the wrong size back, which |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2451 // could make the calculations somewhat inaccurate. |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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|
2452 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2453 if (_inc_cset_recorded_rs_lengths >= diffs) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2454 _inc_cset_recorded_rs_lengths -= diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2455 } else { |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2456 _inc_cset_recorded_rs_lengths = 0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2457 } |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2458 } |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2459 _inc_cset_predicted_elapsed_time_ms += |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
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diff
changeset
|
2460 _inc_cset_predicted_elapsed_time_ms_diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2461 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2462 _inc_cset_recorded_rs_lengths_diffs = 0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
changeset
|
2463 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2464 } |
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|
2465 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2466 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
2467 // This routine is used when: |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2468 // * adding survivor regions to the incremental cset at the end of an |
1316cec51b4d
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diff
changeset
|
2469 // evacuation pause, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2470 // * adding the current allocation region to the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2471 // when it is retired, and |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2472 // * updating existing policy information for a region in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2473 // incremental cset via young list RSet sampling. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2474 // Therefore this routine may be called at a safepoint by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2475 // VM thread, or in-between safepoints by mutator threads (when |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2476 // retiring the current allocation region) or a concurrent |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2477 // refine thread (RSet sampling). |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2478 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2479 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2480 size_t used_bytes = hr->used(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2481 _inc_cset_recorded_rs_lengths += rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2482 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2483 _inc_cset_bytes_used_before += used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2484 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2485 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2486 // in the heap region in case we have to remove this region from |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2487 // 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
|
2488 // rset sampling code |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2489 hr->set_recorded_rs_length(rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2490 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2491 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2492 |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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4710
diff
changeset
|
2493 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
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|
2494 size_t new_rs_length) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2495 // 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
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parents:
4710
diff
changeset
|
2496 assert(hr->is_young(), "Precondition"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2497 assert(!SafepointSynchronize::is_at_safepoint(), |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2498 "should not be at a safepoint"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
changeset
|
2499 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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4710
diff
changeset
|
2500 // 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
|
2501 // _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
|
2502 // 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
|
2503 // 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
|
2504 // 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
|
2505 // 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
|
2506 // 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
|
2507 // fields at the start of a GC. |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
changeset
|
2508 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2509 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
|
2510 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
|
2511 _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
|
2512 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2513 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
|
2514 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
|
2515 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
|
2516 _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
|
2517 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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4710
diff
changeset
|
2518 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
|
2519 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
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parents:
1391
diff
changeset
|
2520 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2521 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2522 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
|
2523 assert(hr->is_young(), "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2524 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
|
2525 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
|
2526 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2527 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2528 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2529 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2530 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2531 // 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
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parents:
1391
diff
changeset
|
2532 // 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
|
2533 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2534 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2535 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
|
2536 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2537 HeapWord* hr_end = hr->end(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2538 _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
|
2539 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2540 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
|
2541 hr->set_in_collection_set(true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2542 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
|
2543 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2544 _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
|
2545 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2546 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2547 // 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
|
2548 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
|
2549 // 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
|
2550 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
|
2551 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2552 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2553 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
|
2554 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2555 // 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
|
2556 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
|
2557 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
|
2558 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2559 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2560 _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
|
2561 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2562 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2563 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2564 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2565 // 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
|
2566 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
|
2567 // 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
|
2568 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
|
2569 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2570 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2571 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
|
2572 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2573 // 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
|
2574 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
|
2575 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
|
2576 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
|
2577 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2578 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2579 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2580 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2581 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2582 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2583 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
|
2584 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
|
2585 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2586 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
|
2587 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2588 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2589 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
|
2590 assert(csr->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2591 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2592 "age: %4d, y: %d, surv: %d", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2593 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2594 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2595 csr->prev_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2596 csr->next_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2597 csr->top_at_conc_mark_count(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2598 csr->age_in_surv_rate_group_cond(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2599 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2600 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2601 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2602 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2603 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2604 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2605 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2606 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
|
2607 const char* false_action_str) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2608 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2609 if (cset_chooser->isEmpty()) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2610 ergo_verbose0(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2611 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2612 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
|
2613 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2614 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2615 size_t reclaimable_bytes = cset_chooser->remainingReclaimableBytes(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2616 size_t capacity_bytes = _g1->capacity(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2617 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
|
2618 double threshold = (double) G1HeapWastePercent; |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2619 if (perc < threshold) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2620 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2621 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2622 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
|
2623 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2624 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2625 ergo_format_perc("threshold"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2626 cset_chooser->remainingRegions(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2627 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2628 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2629 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2630 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2631 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2632 true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2633 ergo_format_reason("candidate old regions available") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2634 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2635 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2636 ergo_format_perc("threshold"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2637 cset_chooser->remainingRegions(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2638 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2639 return true; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2640 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2641 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2642 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
|
2643 // 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
|
2644 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
|
2645 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2646 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
|
2647 finalize_incremental_cset_building(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2648 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2649 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2650 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
|
2651 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2652 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2653 |
2654 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2655 double predicted_pause_time_ms = base_time_ms; | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2656 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2657 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2658 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2659 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2660 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
|
2661 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2662 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
|
2663 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
|
2664 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2665 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2666 double young_start_time_sec = os::elapsedTime(); |
342 | 2667 |
677 | 2668 _collection_set_bytes_used_before = 0; |
4710 | 2669 _last_gc_was_young = gcs_are_young() ? true : false; |
2670 | |
2671 if (_last_gc_was_young) { | |
2672 ++_young_pause_num; | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2673 } else { |
4710 | 2674 ++_mixed_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2675 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2676 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2677 // 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
|
2678 // 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
|
2679 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2680 |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2681 size_t survivor_region_length = young_list->survivor_length(); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2682 size_t eden_region_length = young_list->length() - survivor_region_length; |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4072
diff
changeset
|
2683 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
|
2684 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2685 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2686 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2687 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2688 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2689 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2690 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2691 // 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
|
2692 young_list->clear_survivors(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2693 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2694 _collection_set = _inc_cset_head; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2695 _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
|
2696 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2697 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
|
2698 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2699 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2700 "add young regions to CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2701 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2702 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2703 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
|
2704 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
|
2705 _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
|
2706 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2707 // The number of recorded young regions is the incremental |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2708 // collection set's current size |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2709 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2710 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
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diff
changeset
|
2711 double young_end_time_sec = os::elapsedTime(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2712 _recorded_young_cset_choice_time_ms = |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2713 (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
|
2714 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2715 // We are doing young collections so reset this. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2716 non_young_start_time_sec = young_end_time_sec; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2717 |
4710 | 2718 if (!gcs_are_young()) { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2719 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2720 assert(cset_chooser->verify(), "CSet Chooser verification - pre"); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2721 const size_t min_old_cset_length = cset_chooser->calcMinOldCSetLength(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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changeset
|
2722 const size_t max_old_cset_length = cset_chooser->calcMaxOldCSetLength(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2723 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2724 size_t expensive_region_num = 0; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2725 bool check_time_remaining = adaptive_young_list_length(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2726 HeapRegion* hr = cset_chooser->peek(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2727 while (hr != NULL) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2728 if (old_cset_region_length() >= max_old_cset_length) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2729 // Added maximum number of old regions to the CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2730 ergo_verbose2(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2731 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2732 ergo_format_reason("old CSet region num reached max") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2733 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2734 ergo_format_region("max"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2735 old_cset_region_length(), max_old_cset_length); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2736 break; |
342 | 2737 } |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2738 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2739 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2740 if (check_time_remaining) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2741 if (predicted_time_ms > time_remaining_ms) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2742 // Too expensive for the current CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2743 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2744 if (old_cset_region_length() >= min_old_cset_length) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2745 // We have added the minimum number of old regions to the CSet, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2746 // we are done with this CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2747 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2748 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2749 ergo_format_reason("predicted time is too high") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2750 ergo_format_ms("predicted time") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2751 ergo_format_ms("remaining time") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2752 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2753 ergo_format_region("min"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2754 predicted_time_ms, time_remaining_ms, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2755 old_cset_region_length(), min_old_cset_length); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2756 break; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2757 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2758 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2759 // We'll add it anyway given that we haven't reached the |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2760 // minimum number of old regions. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2761 expensive_region_num += 1; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2762 } |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2763 } else { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2764 if (old_cset_region_length() >= min_old_cset_length) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2765 // In the non-auto-tuning case, we'll finish adding regions |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2766 // to the CSet if we reach the minimum. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2767 ergo_verbose2(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2768 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2769 ergo_format_reason("old CSet region num reached min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2770 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2771 ergo_format_region("min"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2772 old_cset_region_length(), min_old_cset_length); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2773 break; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2774 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2775 } |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2776 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2777 // We will add this region to the CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2778 time_remaining_ms -= predicted_time_ms; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2779 predicted_pause_time_ms += predicted_time_ms; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2780 cset_chooser->remove_and_move_to_next(hr); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2781 _g1->old_set_remove(hr); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2782 add_old_region_to_cset(hr); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2783 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2784 hr = cset_chooser->peek(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2785 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2786 if (hr == NULL) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2787 ergo_verbose0(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2788 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2789 ergo_format_reason("candidate old regions not available")); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2790 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2791 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2792 if (expensive_region_num > 0) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2793 // We print the information once here at the end, predicated on |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2794 // whether we added any apparently expensive regions or not, to |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2795 // avoid generating output per region. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2796 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2797 "added expensive regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2798 ergo_format_reason("old CSet region num not reached min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2799 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2800 ergo_format_region("expensive") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2801 ergo_format_region("min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2802 ergo_format_ms("remaining time"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2803 old_cset_region_length(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2804 expensive_region_num, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2805 min_old_cset_length, |
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2806 time_remaining_ms); |
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2807 } |
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2808 |
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2809 assert(cset_chooser->verify(), "CSet Chooser verification - post"); |
342 | 2810 } |
2811 | |
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2812 stop_incremental_cset_building(); |
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2813 |
342 | 2814 count_CS_bytes_used(); |
2815 | |
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2816 ergo_verbose5(ErgoCSetConstruction, |
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2817 "finish choosing CSet", |
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2818 ergo_format_region("eden") |
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2819 ergo_format_region("survivors") |
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2820 ergo_format_region("old") |
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2821 ergo_format_ms("predicted pause time") |
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2822 ergo_format_ms("target pause time"), |
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2823 eden_region_length, survivor_region_length, |
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2824 old_cset_region_length(), |
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2825 predicted_pause_time_ms, target_pause_time_ms); |
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2826 |
342 | 2827 double non_young_end_time_sec = os::elapsedTime(); |
2828 _recorded_non_young_cset_choice_time_ms = | |
2829 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2830 } |