Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 5988:2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
Summary: Removed lots of dead code after some recent conc mark changes.
Reviewed-by: brutisso, johnc
author | tonyp |
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date | Thu, 05 Apr 2012 13:57:23 -0400 |
parents | 500023bd0818 |
children | 5c86f8211d1e |
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 _root_region_scan_wait_time_ms(0.0), |
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144 |
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145 _cur_ref_proc_time_ms(0.0), |
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146 _cur_ref_enq_time_ms(0.0), |
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147 |
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148 #ifndef PRODUCT |
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149 _min_clear_cc_time_ms(-1.0), |
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150 _max_clear_cc_time_ms(-1.0), |
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151 _cur_clear_cc_time_ms(0.0), |
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152 _cum_clear_cc_time_ms(0.0), |
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153 _num_cc_clears(0L), |
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154 #endif |
342 | 155 |
156 _aux_num(10), | |
157 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
158 _cur_aux_start_times_ms(new double[_aux_num]), | |
159 _cur_aux_times_ms(new double[_aux_num]), | |
160 _cur_aux_times_set(new bool[_aux_num]), | |
161 | |
162 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
163 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
164 | |
165 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
166 _prev_collection_pause_end_ms(0.0), | |
167 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
168 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
169 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 170 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
171 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 172 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 173 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 174 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
175 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
176 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
177 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
178 _non_young_other_cost_per_region_ms_seq( | |
179 new TruncatedSeq(TruncatedSeqLength)), | |
180 | |
181 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
182 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 | |
751 | 184 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 185 |
4710 | 186 _gcs_are_young(true), |
187 _young_pause_num(0), | |
188 _mixed_pause_num(0), | |
342 | 189 |
190 _during_marking(false), | |
191 _in_marking_window(false), | |
192 _in_marking_window_im(false), | |
193 | |
194 _known_garbage_ratio(0.0), | |
195 _known_garbage_bytes(0), | |
196 | |
197 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
198 | |
4710 | 199 _recent_prev_end_times_for_all_gcs_sec( |
200 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 201 |
202 _recent_avg_pause_time_ratio(0.0), | |
203 | |
204 _all_full_gc_times_ms(new NumberSeq()), | |
205 | |
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206 _initiate_conc_mark_if_possible(false), |
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207 _during_initial_mark_pause(false), |
4710 | 208 _last_young_gc(false), |
209 _last_gc_was_young(false), | |
342 | 210 |
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211 _eden_bytes_before_gc(0), |
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212 _survivor_bytes_before_gc(0), |
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213 _capacity_before_gc(0), |
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214 |
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215 _eden_cset_region_length(0), |
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216 _survivor_cset_region_length(0), |
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217 _old_cset_region_length(0), |
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218 |
342 | 219 _collection_set(NULL), |
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220 _collection_set_bytes_used_before(0), |
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221 |
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222 // Incremental CSet attributes |
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223 _inc_cset_build_state(Inactive), |
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224 _inc_cset_head(NULL), |
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225 _inc_cset_tail(NULL), |
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226 _inc_cset_bytes_used_before(0), |
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227 _inc_cset_max_finger(NULL), |
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228 _inc_cset_recorded_rs_lengths(0), |
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229 _inc_cset_recorded_rs_lengths_diffs(0), |
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230 _inc_cset_predicted_elapsed_time_ms(0.0), |
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231 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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232 |
342 | 233 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
234 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
235 #endif // _MSC_VER | |
236 | |
237 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
238 G1YoungSurvRateNumRegionsSummary)), | |
239 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 240 G1YoungSurvRateNumRegionsSummary)), |
342 | 241 // add here any more surv rate groups |
545 | 242 _recorded_survivor_regions(0), |
243 _recorded_survivor_head(NULL), | |
244 _recorded_survivor_tail(NULL), | |
1356 | 245 _survivors_age_table(true), |
246 | |
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247 _gc_overhead_perc(0.0) { |
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248 |
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249 // Set up the region size and associated fields. Given that the |
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250 // policy is created before the heap, we have to set this up here, |
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251 // so it's done as soon as possible. |
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252 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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253 HeapRegionRemSet::setup_remset_size(); |
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254 |
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255 G1ErgoVerbose::initialize(); |
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256 if (PrintAdaptiveSizePolicy) { |
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257 // Currently, we only use a single switch for all the heuristics. |
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258 G1ErgoVerbose::set_enabled(true); |
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259 // Given that we don't currently have a verboseness level |
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260 // parameter, we'll hardcode this to high. This can be easily |
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261 // changed in the future. |
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262 G1ErgoVerbose::set_level(ErgoHigh); |
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263 } else { |
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264 G1ErgoVerbose::set_enabled(false); |
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265 } |
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266 |
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267 // Verify PLAB sizes |
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268 const size_t region_size = HeapRegion::GrainWords; |
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269 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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270 char buffer[128]; |
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271 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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272 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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273 vm_exit_during_initialization(buffer); |
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274 } |
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275 |
342 | 276 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
277 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
278 | |
1611 | 279 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 280 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
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281 _par_last_satb_filtering_times_ms = new double[_parallel_gc_threads]; |
342 | 282 |
283 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
284 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
285 | |
286 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
287 | |
288 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
289 | |
290 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 291 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
292 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 293 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
4023 | 294 _par_last_gc_worker_other_times_ms = new double[_parallel_gc_threads]; |
342 | 295 |
296 int index; | |
297 if (ParallelGCThreads == 0) | |
298 index = 0; | |
299 else if (ParallelGCThreads > 8) | |
300 index = 7; | |
301 else | |
302 index = ParallelGCThreads - 1; | |
303 | |
304 _pending_card_diff_seq->add(0.0); | |
305 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
306 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 307 _young_cards_per_entry_ratio_seq->add( |
308 young_cards_per_entry_ratio_defaults[index]); | |
342 | 309 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
310 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
311 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
312 _young_other_cost_per_region_ms_seq->add( | |
313 young_other_cost_per_region_ms_defaults[index]); | |
314 _non_young_other_cost_per_region_ms_seq->add( | |
315 non_young_other_cost_per_region_ms_defaults[index]); | |
316 | |
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317 // Below, we might need to calculate the pause time target based on |
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318 // the pause interval. When we do so we are going to give G1 maximum |
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319 // flexibility and allow it to do pauses when it needs to. So, we'll |
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320 // arrange that the pause interval to be pause time target + 1 to |
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321 // ensure that a) the pause time target is maximized with respect to |
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322 // the pause interval and b) we maintain the invariant that pause |
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323 // time target < pause interval. If the user does not want this |
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324 // maximum flexibility, they will have to set the pause interval |
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325 // explicitly. |
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326 |
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327 // First make sure that, if either parameter is set, its value is |
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328 // reasonable. |
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329 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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330 if (MaxGCPauseMillis < 1) { |
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331 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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332 "greater than 0"); |
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333 } |
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334 } |
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335 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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336 if (GCPauseIntervalMillis < 1) { |
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337 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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338 "greater than 0"); |
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339 } |
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340 } |
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341 |
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342 // Then, if the pause time target parameter was not set, set it to |
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343 // the default value. |
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344 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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345 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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346 // The default pause time target in G1 is 200ms |
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347 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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348 } else { |
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349 // We do not allow the pause interval to be set without the |
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350 // pause time target |
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351 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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352 "without setting MaxGCPauseMillis"); |
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353 } |
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354 } |
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355 |
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356 // Then, if the interval parameter was not set, set it according to |
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357 // the pause time target (this will also deal with the case when the |
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358 // pause time target is the default value). |
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359 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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360 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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361 } |
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362 |
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363 // Finally, make sure that the two parameters are consistent. |
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364 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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365 char buffer[256]; |
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366 jio_snprintf(buffer, 256, |
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367 "MaxGCPauseMillis (%u) should be less than " |
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368 "GCPauseIntervalMillis (%u)", |
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369 MaxGCPauseMillis, GCPauseIntervalMillis); |
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370 vm_exit_during_initialization(buffer); |
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371 } |
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372 |
751 | 373 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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374 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 375 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 376 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 377 |
378 // start conservatively (around 50ms is about right) | |
379 _concurrent_mark_remark_times_ms->add(0.05); | |
380 _concurrent_mark_cleanup_times_ms->add(0.20); | |
381 _tenuring_threshold = MaxTenuringThreshold; | |
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382 // _max_survivor_regions will be calculated by |
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383 // update_young_list_target_length() during initialization. |
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384 _max_survivor_regions = 0; |
545 | 385 |
1356 | 386 assert(GCTimeRatio > 0, |
387 "we should have set it to a default value set_g1_gc_flags() " | |
388 "if a user set it to 0"); | |
389 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
390 | |
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391 uintx reserve_perc = G1ReservePercent; |
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392 // Put an artificial ceiling on this so that it's not set to a silly value. |
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393 if (reserve_perc > 50) { |
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394 reserve_perc = 50; |
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395 warning("G1ReservePercent is set to a value that is too large, " |
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396 "it's been updated to %u", reserve_perc); |
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397 } |
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398 _reserve_factor = (double) reserve_perc / 100.0; |
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399 // This will be set when the heap is expanded |
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400 // for the first time during initialization. |
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401 _reserve_regions = 0; |
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402 |
342 | 403 initialize_all(); |
4013 | 404 _collectionSetChooser = new CollectionSetChooser(); |
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405 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 406 } |
407 | |
408 void G1CollectorPolicy::initialize_flags() { | |
409 set_min_alignment(HeapRegion::GrainBytes); | |
410 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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411 if (SurvivorRatio < 1) { |
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412 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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413 } |
342 | 414 CollectorPolicy::initialize_flags(); |
415 } | |
416 | |
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417 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
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418 assert(G1DefaultMinNewGenPercent <= G1DefaultMaxNewGenPercent, "Min larger than max"); |
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419 assert(G1DefaultMinNewGenPercent > 0 && G1DefaultMinNewGenPercent < 100, "Min out of bounds"); |
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420 assert(G1DefaultMaxNewGenPercent > 0 && G1DefaultMaxNewGenPercent < 100, "Max out of bounds"); |
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421 |
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422 if (FLAG_IS_CMDLINE(NewRatio)) { |
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423 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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424 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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425 } else { |
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426 _sizer_kind = SizerNewRatio; |
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427 _adaptive_size = false; |
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428 return; |
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429 } |
3976 | 430 } |
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431 |
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432 if (FLAG_IS_CMDLINE(NewSize)) { |
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433 _min_desired_young_length = MAX2((size_t) 1, NewSize / HeapRegion::GrainBytes); |
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434 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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435 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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436 _sizer_kind = SizerMaxAndNewSize; |
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437 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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438 } else { |
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439 _sizer_kind = SizerNewSizeOnly; |
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440 } |
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441 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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442 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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443 _sizer_kind = SizerMaxNewSizeOnly; |
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444 } |
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445 } |
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446 |
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447 size_t G1YoungGenSizer::calculate_default_min_length(size_t new_number_of_heap_regions) { |
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448 size_t default_value = (new_number_of_heap_regions * G1DefaultMinNewGenPercent) / 100; |
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449 return MAX2((size_t)1, default_value); |
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450 } |
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451 |
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452 size_t G1YoungGenSizer::calculate_default_max_length(size_t new_number_of_heap_regions) { |
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453 size_t default_value = (new_number_of_heap_regions * G1DefaultMaxNewGenPercent) / 100; |
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454 return MAX2((size_t)1, default_value); |
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455 } |
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456 |
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457 void G1YoungGenSizer::heap_size_changed(size_t new_number_of_heap_regions) { |
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458 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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459 |
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460 switch (_sizer_kind) { |
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461 case SizerDefaults: |
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462 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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463 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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464 break; |
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465 case SizerNewSizeOnly: |
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466 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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467 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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468 break; |
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469 case SizerMaxNewSizeOnly: |
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470 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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471 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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472 break; |
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473 case SizerMaxAndNewSize: |
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474 // Do nothing. Values set on the command line, don't update them at runtime. |
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475 break; |
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476 case SizerNewRatio: |
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477 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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478 _max_desired_young_length = _min_desired_young_length; |
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479 break; |
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480 default: |
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481 ShouldNotReachHere(); |
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482 } |
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483 |
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484 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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485 } |
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486 |
342 | 487 void G1CollectorPolicy::init() { |
488 // Set aside an initial future to_space. | |
489 _g1 = G1CollectedHeap::heap(); | |
490 | |
491 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
492 | |
545 | 493 initialize_gc_policy_counters(); |
494 | |
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495 if (adaptive_young_list_length()) { |
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496 _young_list_fixed_length = 0; |
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497 } else { |
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498 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 499 } |
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500 _free_regions_at_end_of_collection = _g1->free_regions(); |
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501 update_young_list_target_length(); |
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502 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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503 |
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504 // We may immediately start allocating regions and placing them on the |
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505 // collection set list. Initialize the per-collection set info |
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506 start_incremental_cset_building(); |
342 | 507 } |
508 | |
545 | 509 // Create the jstat counters for the policy. |
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510 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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511 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 512 } |
513 | |
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514 bool G1CollectorPolicy::predict_will_fit(size_t young_length, |
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515 double base_time_ms, |
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516 size_t base_free_regions, |
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517 double target_pause_time_ms) { |
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518 if (young_length >= base_free_regions) { |
342 | 519 // end condition 1: not enough space for the young regions |
520 return false; | |
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521 } |
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522 |
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523 double accum_surv_rate = accum_yg_surv_rate_pred((int)(young_length - 1)); |
342 | 524 size_t bytes_to_copy = |
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525 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 526 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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527 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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528 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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529 if (pause_time_ms > target_pause_time_ms) { |
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530 // end condition 2: prediction is over the target pause time |
342 | 531 return false; |
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532 } |
342 | 533 |
534 size_t free_bytes = | |
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535 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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536 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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537 // end condition 3: out-of-space (conservatively!) |
342 | 538 return false; |
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539 } |
342 | 540 |
541 // success! | |
542 return true; | |
543 } | |
544 | |
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545 void G1CollectorPolicy::record_new_heap_size(size_t new_number_of_regions) { |
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546 // re-calculate the necessary reserve |
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547 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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548 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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549 // smaller than 1.0) we'll get 1. |
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550 _reserve_regions = (size_t) ceil(reserve_regions_d); |
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551 |
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552 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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553 } |
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554 |
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555 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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556 size_t base_min_length) { |
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557 size_t desired_min_length = 0; |
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558 if (adaptive_young_list_length()) { |
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559 if (_alloc_rate_ms_seq->num() > 3) { |
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560 double now_sec = os::elapsedTime(); |
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561 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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562 double alloc_rate_ms = predict_alloc_rate_ms(); |
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563 desired_min_length = (size_t) ceil(alloc_rate_ms * when_ms); |
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564 } else { |
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565 // otherwise we don't have enough info to make the prediction |
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566 } |
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567 } |
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568 desired_min_length += base_min_length; |
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569 // make sure we don't go below any user-defined minimum bound |
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570 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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571 } |
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572 |
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573 size_t G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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574 // Here, we might want to also take into account any additional |
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575 // constraints (i.e., user-defined minimum bound). Currently, we |
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576 // effectively don't set this bound. |
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577 return _young_gen_sizer->max_desired_young_length(); |
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578 } |
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579 |
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580 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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581 if (rs_lengths == (size_t) -1) { |
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582 // if it's set to the default value (-1), we should predict it; |
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583 // otherwise, use the given value. |
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584 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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585 } |
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586 |
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587 // Calculate the absolute and desired min bounds. |
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588 |
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589 // This is how many young regions we already have (currently: the survivors). |
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590 size_t base_min_length = recorded_survivor_regions(); |
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591 // This is the absolute minimum young length, which ensures that we |
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592 // can allocate one eden region in the worst-case. |
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593 size_t absolute_min_length = base_min_length + 1; |
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594 size_t desired_min_length = |
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595 calculate_young_list_desired_min_length(base_min_length); |
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596 if (desired_min_length < absolute_min_length) { |
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597 desired_min_length = absolute_min_length; |
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598 } |
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599 |
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600 // Calculate the absolute and desired max bounds. |
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601 |
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602 // We will try our best not to "eat" into the reserve. |
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603 size_t absolute_max_length = 0; |
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604 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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605 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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606 } |
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607 size_t desired_max_length = calculate_young_list_desired_max_length(); |
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608 if (desired_max_length > absolute_max_length) { |
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609 desired_max_length = absolute_max_length; |
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610 } |
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611 |
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612 size_t young_list_target_length = 0; |
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613 if (adaptive_young_list_length()) { |
4710 | 614 if (gcs_are_young()) { |
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615 young_list_target_length = |
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616 calculate_young_list_target_length(rs_lengths, |
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617 base_min_length, |
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618 desired_min_length, |
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619 desired_max_length); |
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620 _rs_lengths_prediction = rs_lengths; |
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621 } else { |
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622 // Don't calculate anything and let the code below bound it to |
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623 // the desired_min_length, i.e., do the next GC as soon as |
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624 // possible to maximize how many old regions we can add to it. |
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625 } |
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626 } else { |
4912
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627 // The user asked for a fixed young gen so we'll fix the young gen |
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628 // whether the next GC is young or mixed. |
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629 young_list_target_length = _young_list_fixed_length; |
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630 } |
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631 |
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632 // Make sure we don't go over the desired max length, nor under the |
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633 // desired min length. In case they clash, desired_min_length wins |
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634 // which is why that test is second. |
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635 if (young_list_target_length > desired_max_length) { |
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636 young_list_target_length = desired_max_length; |
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637 } |
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638 if (young_list_target_length < desired_min_length) { |
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639 young_list_target_length = desired_min_length; |
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640 } |
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641 |
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642 assert(young_list_target_length > recorded_survivor_regions(), |
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643 "we should be able to allocate at least one eden region"); |
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644 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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645 _young_list_target_length = young_list_target_length; |
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646 |
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647 update_max_gc_locker_expansion(); |
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648 } |
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649 |
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650 size_t |
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651 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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652 size_t base_min_length, |
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653 size_t desired_min_length, |
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654 size_t desired_max_length) { |
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655 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 656 assert(gcs_are_young(), "only call this for young GCs"); |
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657 |
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658 // In case some edge-condition makes the desired max length too small... |
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659 if (desired_max_length <= desired_min_length) { |
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660 return desired_min_length; |
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661 } |
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662 |
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663 // We'll adjust min_young_length and max_young_length not to include |
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664 // the already allocated young regions (i.e., so they reflect the |
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665 // min and max eden regions we'll allocate). The base_min_length |
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666 // will be reflected in the predictions by the |
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667 // survivor_regions_evac_time prediction. |
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668 assert(desired_min_length > base_min_length, "invariant"); |
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669 size_t min_young_length = desired_min_length - base_min_length; |
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670 assert(desired_max_length > base_min_length, "invariant"); |
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671 size_t max_young_length = desired_max_length - base_min_length; |
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672 |
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673 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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674 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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675 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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676 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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677 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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678 double base_time_ms = |
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679 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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680 survivor_regions_evac_time; |
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681 size_t available_free_regions = _free_regions_at_end_of_collection; |
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682 size_t base_free_regions = 0; |
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683 if (available_free_regions > _reserve_regions) { |
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684 base_free_regions = available_free_regions - _reserve_regions; |
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685 } |
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686 |
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687 // Here, we will make sure that the shortest young length that |
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688 // makes sense fits within the target pause time. |
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689 |
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690 if (predict_will_fit(min_young_length, base_time_ms, |
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691 base_free_regions, target_pause_time_ms)) { |
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692 // The shortest young length will fit into the target pause time; |
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693 // we'll now check whether the absolute maximum number of young |
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694 // regions will fit in the target pause time. If not, we'll do |
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695 // a binary search between min_young_length and max_young_length. |
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696 if (predict_will_fit(max_young_length, base_time_ms, |
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697 base_free_regions, target_pause_time_ms)) { |
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698 // The maximum young length will fit into the target pause time. |
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699 // We are done so set min young length to the maximum length (as |
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700 // the result is assumed to be returned in min_young_length). |
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701 min_young_length = max_young_length; |
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702 } else { |
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703 // The maximum possible number of young regions will not fit within |
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704 // the target pause time so we'll search for the optimal |
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705 // length. The loop invariants are: |
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706 // |
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707 // min_young_length < max_young_length |
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708 // min_young_length is known to fit into the target pause time |
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709 // max_young_length is known not to fit into the target pause time |
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710 // |
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711 // Going into the loop we know the above hold as we've just |
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712 // checked them. Every time around the loop we check whether |
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713 // the middle value between min_young_length and |
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714 // max_young_length fits into the target pause time. If it |
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715 // does, it becomes the new min. If it doesn't, it becomes |
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716 // the new max. This way we maintain the loop invariants. |
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717 |
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718 assert(min_young_length < max_young_length, "invariant"); |
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719 size_t diff = (max_young_length - min_young_length) / 2; |
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720 while (diff > 0) { |
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721 size_t young_length = min_young_length + diff; |
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722 if (predict_will_fit(young_length, base_time_ms, |
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723 base_free_regions, target_pause_time_ms)) { |
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724 min_young_length = young_length; |
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725 } else { |
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726 max_young_length = young_length; |
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727 } |
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728 assert(min_young_length < max_young_length, "invariant"); |
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729 diff = (max_young_length - min_young_length) / 2; |
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730 } |
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731 // The results is min_young_length which, according to the |
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732 // loop invariants, should fit within the target pause time. |
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733 |
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734 // These are the post-conditions of the binary search above: |
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735 assert(min_young_length < max_young_length, |
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736 "otherwise we should have discovered that max_young_length " |
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737 "fits into the pause target and not done the binary search"); |
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738 assert(predict_will_fit(min_young_length, base_time_ms, |
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739 base_free_regions, target_pause_time_ms), |
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740 "min_young_length, the result of the binary search, should " |
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741 "fit into the pause target"); |
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742 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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743 base_free_regions, target_pause_time_ms), |
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744 "min_young_length, the result of the binary search, should be " |
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745 "optimal, so no larger length should fit into the pause target"); |
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746 } |
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747 } else { |
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748 // Even the minimum length doesn't fit into the pause time |
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749 // target, return it as the result nevertheless. |
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750 } |
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751 return base_min_length + min_young_length; |
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752 } |
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753 |
545 | 754 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
755 double survivor_regions_evac_time = 0.0; | |
756 for (HeapRegion * r = _recorded_survivor_head; | |
757 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
758 r = r->get_next_young_region()) { | |
759 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
760 } | |
761 return survivor_regions_evac_time; | |
762 } | |
763 | |
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764 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 765 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
766 | |
1394
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767 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 768 if (rs_lengths > _rs_lengths_prediction) { |
769 // add 10% to avoid having to recalculate often | |
770 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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771 update_young_list_target_length(rs_lengths_prediction); |
342 | 772 } |
773 } | |
774 | |
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775 |
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776 |
342 | 777 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
778 bool is_tlab, | |
779 bool* gc_overhead_limit_was_exceeded) { | |
780 guarantee(false, "Not using this policy feature yet."); | |
781 return NULL; | |
782 } | |
783 | |
784 // This method controls how a collector handles one or more | |
785 // of its generations being fully allocated. | |
786 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
787 bool is_tlab) { | |
788 guarantee(false, "Not using this policy feature yet."); | |
789 return NULL; | |
790 } | |
791 | |
792 | |
793 #ifndef PRODUCT | |
794 bool G1CollectorPolicy::verify_young_ages() { | |
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795 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 796 return |
797 verify_young_ages(head, _short_lived_surv_rate_group); | |
798 // also call verify_young_ages on any additional surv rate groups | |
799 } | |
800 | |
801 bool | |
802 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
803 SurvRateGroup *surv_rate_group) { | |
804 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
805 | |
806 const char* name = surv_rate_group->name(); | |
807 bool ret = true; | |
808 int prev_age = -1; | |
809 | |
810 for (HeapRegion* curr = head; | |
811 curr != NULL; | |
812 curr = curr->get_next_young_region()) { | |
813 SurvRateGroup* group = curr->surv_rate_group(); | |
814 if (group == NULL && !curr->is_survivor()) { | |
815 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
816 ret = false; | |
817 } | |
818 | |
819 if (surv_rate_group == group) { | |
820 int age = curr->age_in_surv_rate_group(); | |
821 | |
822 if (age < 0) { | |
823 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
824 ret = false; | |
825 } | |
826 | |
827 if (age <= prev_age) { | |
828 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
829 "(%d, %d)", name, age, prev_age); | |
830 ret = false; | |
831 } | |
832 prev_age = age; | |
833 } | |
834 } | |
835 | |
836 return ret; | |
837 } | |
838 #endif // PRODUCT | |
839 | |
840 void G1CollectorPolicy::record_full_collection_start() { | |
841 _cur_collection_start_sec = os::elapsedTime(); | |
842 // Release the future to-space so that it is available for compaction into. | |
843 _g1->set_full_collection(); | |
844 } | |
845 | |
846 void G1CollectorPolicy::record_full_collection_end() { | |
847 // Consider this like a collection pause for the purposes of allocation | |
848 // since last pause. | |
849 double end_sec = os::elapsedTime(); | |
850 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
851 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
852 | |
853 _all_full_gc_times_ms->add(full_gc_time_ms); | |
854 | |
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855 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 856 |
857 _g1->clear_full_collection(); | |
858 | |
4710 | 859 // "Nuke" the heuristics that control the young/mixed GC |
860 // transitions and make sure we start with young GCs after the Full GC. | |
861 set_gcs_are_young(true); | |
862 _last_young_gc = false; | |
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863 clear_initiate_conc_mark_if_possible(); |
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864 clear_during_initial_mark_pause(); |
342 | 865 _known_garbage_bytes = 0; |
866 _known_garbage_ratio = 0.0; | |
867 _in_marking_window = false; | |
868 _in_marking_window_im = false; | |
869 | |
870 _short_lived_surv_rate_group->start_adding_regions(); | |
871 // also call this on any additional surv rate groups | |
872 | |
545 | 873 record_survivor_regions(0, NULL, NULL); |
874 | |
342 | 875 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 876 // Reset survivors SurvRateGroup. |
877 _survivor_surv_rate_group->reset(); | |
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878 update_young_list_target_length(); |
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879 _collectionSetChooser->clearMarkedHeapRegions(); |
1973 | 880 } |
342 | 881 |
882 void G1CollectorPolicy::record_stop_world_start() { | |
883 _stop_world_start = os::elapsedTime(); | |
884 } | |
885 | |
886 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
887 size_t start_used) { | |
888 if (PrintGCDetails) { | |
889 gclog_or_tty->stamp(PrintGCTimeStamps); | |
890 gclog_or_tty->print("[GC pause"); | |
4710 | 891 gclog_or_tty->print(" (%s)", gcs_are_young() ? "young" : "mixed"); |
342 | 892 } |
893 | |
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894 // We only need to do this here as the policy will only be applied |
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895 // to the GC we're about to start. so, no point is calculating this |
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896 // every time we calculate / recalculate the target young length. |
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897 update_survivors_policy(); |
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898 |
1973 | 899 assert(_g1->used() == _g1->recalculate_used(), |
900 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
901 _g1->used(), _g1->recalculate_used())); | |
342 | 902 |
903 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
904 _all_stop_world_times_ms->add(s_w_t_ms); | |
905 _stop_world_start = 0.0; | |
906 | |
907 _cur_collection_start_sec = start_time_sec; | |
908 _cur_collection_pause_used_at_start_bytes = start_used; | |
909 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
910 _pending_cards = _g1->pending_card_num(); | |
911 _max_pending_cards = _g1->max_pending_card_num(); | |
912 | |
913 _bytes_in_collection_set_before_gc = 0; | |
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914 _bytes_copied_during_gc = 0; |
342 | 915 |
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916 YoungList* young_list = _g1->young_list(); |
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917 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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918 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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919 _capacity_before_gc = _g1->capacity(); |
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920 |
342 | 921 #ifdef DEBUG |
922 // initialise these to something well known so that we can spot | |
923 // if they are not set properly | |
924 | |
925 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 926 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
927 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
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928 _par_last_satb_filtering_times_ms[i] = -1234.0; |
1611 | 929 _par_last_update_rs_times_ms[i] = -1234.0; |
930 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
931 _par_last_scan_rs_times_ms[i] = -1234.0; | |
932 _par_last_obj_copy_times_ms[i] = -1234.0; | |
933 _par_last_termination_times_ms[i] = -1234.0; | |
934 _par_last_termination_attempts[i] = -1234.0; | |
935 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 936 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 937 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 938 } |
939 #endif | |
940 | |
941 for (int i = 0; i < _aux_num; ++i) { | |
942 _cur_aux_times_ms[i] = 0.0; | |
943 _cur_aux_times_set[i] = false; | |
944 } | |
945 | |
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946 // This is initialized to zero here and is set during the evacuation |
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947 // pause if we actually waited for the root region scanning to finish. |
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948 _root_region_scan_wait_time_ms = 0.0; |
342 | 949 |
4710 | 950 _last_gc_was_young = false; |
342 | 951 |
952 // do that for any other surv rate groups | |
953 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 954 _survivors_age_table.clear(); |
545 | 955 |
342 | 956 assert( verify_young_ages(), "region age verification" ); |
957 } | |
958 | |
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959 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 960 mark_init_elapsed_time_ms) { |
961 _during_marking = true; | |
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962 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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963 clear_during_initial_mark_pause(); |
342 | 964 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
965 } | |
966 | |
967 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
968 _mark_remark_start_sec = os::elapsedTime(); | |
969 _during_marking = false; | |
970 } | |
971 | |
972 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
973 double end_time_sec = os::elapsedTime(); | |
974 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
975 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
976 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
977 _prev_collection_pause_end_ms += elapsed_time_ms; | |
978 | |
979 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
980 } | |
981 | |
982 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
983 _mark_cleanup_start_sec = os::elapsedTime(); | |
984 } | |
985 | |
4013 | 986 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 987 _last_young_gc = true; |
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988 _in_marking_window = false; |
342 | 989 } |
990 | |
991 void G1CollectorPolicy::record_concurrent_pause() { | |
992 if (_stop_world_start > 0.0) { | |
993 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
994 _all_yield_times_ms->add(yield_ms); | |
995 } | |
996 } | |
997 | |
998 void G1CollectorPolicy::record_concurrent_pause_end() { | |
999 } | |
1000 | |
1001 template<class T> | |
1002 T sum_of(T* sum_arr, int start, int n, int N) { | |
1003 T sum = (T)0; | |
1004 for (int i = 0; i < n; i++) { | |
1005 int j = (start + i) % N; | |
1006 sum += sum_arr[j]; | |
1007 } | |
1008 return sum; | |
1009 } | |
1010 | |
1611 | 1011 void G1CollectorPolicy::print_par_stats(int level, |
1012 const char* str, | |
2430 | 1013 double* data) { |
342 | 1014 double min = data[0], max = data[0]; |
1015 double total = 0.0; | |
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1016 LineBuffer buf(level); |
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1017 buf.append("[%s (ms):", str); |
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1018 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1019 double val = data[i]; |
1020 if (val < min) | |
1021 min = val; | |
1022 if (val > max) | |
1023 max = val; | |
1024 total += val; | |
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1025 buf.append(" %3.1lf", val); |
342 | 1026 } |
2430 | 1027 buf.append_and_print_cr(""); |
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1028 double avg = total / (double) no_of_gc_threads(); |
2430 | 1029 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", |
1030 avg, min, max, max - min); | |
342 | 1031 } |
1032 | |
1611 | 1033 void G1CollectorPolicy::print_par_sizes(int level, |
1034 const char* str, | |
2430 | 1035 double* data) { |
342 | 1036 double min = data[0], max = data[0]; |
1037 double total = 0.0; | |
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1038 LineBuffer buf(level); |
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1039 buf.append("[%s :", str); |
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1040 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1041 double val = data[i]; |
1042 if (val < min) | |
1043 min = val; | |
1044 if (val > max) | |
1045 max = val; | |
1046 total += val; | |
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1047 buf.append(" %d", (int) val); |
342 | 1048 } |
2430 | 1049 buf.append_and_print_cr(""); |
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1050 double avg = total / (double) no_of_gc_threads(); |
2430 | 1051 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", |
1052 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1053 } |
1054 | |
4023 | 1055 void G1CollectorPolicy::print_stats(int level, |
1056 const char* str, | |
1057 double value) { | |
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1058 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1059 } |
1060 | |
4023 | 1061 void G1CollectorPolicy::print_stats(int level, |
1062 const char* str, | |
1063 int value) { | |
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1064 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1065 } |
1066 | |
4023 | 1067 double G1CollectorPolicy::avg_value(double* data) { |
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1068 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1069 double ret = 0.0; |
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1070 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1071 ret += data[i]; |
4023 | 1072 } |
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1073 return ret / (double) no_of_gc_threads(); |
342 | 1074 } else { |
1075 return data[0]; | |
1076 } | |
1077 } | |
1078 | |
4023 | 1079 double G1CollectorPolicy::max_value(double* data) { |
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1080 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1081 double ret = data[0]; |
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1082 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
4023 | 1083 if (data[i] > ret) { |
342 | 1084 ret = data[i]; |
4023 | 1085 } |
1086 } | |
342 | 1087 return ret; |
1088 } else { | |
1089 return data[0]; | |
1090 } | |
1091 } | |
1092 | |
4023 | 1093 double G1CollectorPolicy::sum_of_values(double* data) { |
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1094 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1095 double sum = 0.0; |
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1096 for (uint i = 0; i < no_of_gc_threads(); i++) { |
342 | 1097 sum += data[i]; |
4023 | 1098 } |
342 | 1099 return sum; |
1100 } else { | |
1101 return data[0]; | |
1102 } | |
1103 } | |
1104 | |
4023 | 1105 double G1CollectorPolicy::max_sum(double* data1, double* data2) { |
342 | 1106 double ret = data1[0] + data2[0]; |
1107 | |
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1108 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1109 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
342 | 1110 double data = data1[i] + data2[i]; |
4023 | 1111 if (data > ret) { |
342 | 1112 ret = data; |
4023 | 1113 } |
342 | 1114 } |
1115 } | |
1116 return ret; | |
1117 } | |
1118 | |
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1119 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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1120 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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1121 return false; |
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1122 } |
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1123 |
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1124 size_t marking_initiating_used_threshold = |
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1125 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1126 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
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1127 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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1128 |
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1129 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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1130 if (gcs_are_young()) { |
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1131 ergo_verbose5(ErgoConcCycles, |
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1132 "request concurrent cycle initiation", |
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1133 ergo_format_reason("occupancy higher than threshold") |
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1134 ergo_format_byte("occupancy") |
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1135 ergo_format_byte("allocation request") |
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1136 ergo_format_byte_perc("threshold") |
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1137 ergo_format_str("source"), |
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1138 cur_used_bytes, |
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1139 alloc_byte_size, |
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1140 marking_initiating_used_threshold, |
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1141 (double) InitiatingHeapOccupancyPercent, |
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1142 source); |
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1143 return true; |
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1144 } else { |
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1145 ergo_verbose5(ErgoConcCycles, |
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1146 "do not request concurrent cycle initiation", |
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1147 ergo_format_reason("still doing mixed collections") |
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1148 ergo_format_byte("occupancy") |
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1149 ergo_format_byte("allocation request") |
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1150 ergo_format_byte_perc("threshold") |
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1151 ergo_format_str("source"), |
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1152 cur_used_bytes, |
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1153 alloc_byte_size, |
4829
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1154 marking_initiating_used_threshold, |
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1155 (double) InitiatingHeapOccupancyPercent, |
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1156 source); |
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1157 } |
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1158 } |
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1159 |
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1160 return false; |
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1161 } |
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1162 |
342 | 1163 // Anything below that is considered to be zero |
1164 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1165 | |
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1166 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1167 double end_time_sec = os::elapsedTime(); |
1168 double elapsed_ms = _last_pause_time_ms; | |
1833
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1169 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
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1170 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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1171 "otherwise, the subtraction below does not make sense"); |
342 | 1172 size_t rs_size = |
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1173 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1174 size_t cur_used_bytes = _g1->used(); |
1175 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1176 bool last_pause_included_initial_mark = false; | |
1707 | 1177 bool update_stats = !_g1->evacuation_failed(); |
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1178 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1179 |
1180 #ifndef PRODUCT | |
1181 if (G1YoungSurvRateVerbose) { | |
1182 gclog_or_tty->print_cr(""); | |
1183 _short_lived_surv_rate_group->print(); | |
1184 // do that for any other surv rate groups too | |
1185 } | |
1186 #endif // PRODUCT | |
1187 | |
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1188 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1189 if (last_pause_included_initial_mark) { |
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1190 record_concurrent_mark_init_end(0.0); |
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1191 } else if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
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1192 // Note: this might have already been set, if during the last |
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1193 // pause we decided to start a cycle but at the beginning of |
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1194 // this pause we decided to postpone it. That's OK. |
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1195 set_initiate_conc_mark_if_possible(); |
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1196 } |
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1197 |
342 | 1198 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1199 end_time_sec, false); | |
1200 | |
1201 // This assert is exempted when we're doing parallel collection pauses, | |
1202 // because the fragmentation caused by the parallel GC allocation buffers | |
1203 // can lead to more memory being used during collection than was used | |
1204 // before. Best leave this out until the fragmentation problem is fixed. | |
1205 // Pauses in which evacuation failed can also lead to negative | |
1206 // collections, since no space is reclaimed from a region containing an | |
1207 // object whose evacuation failed. | |
1208 // Further, we're now always doing parallel collection. But I'm still | |
1209 // leaving this here as a placeholder for a more precise assertion later. | |
1210 // (DLD, 10/05.) | |
1211 assert((true || parallel) // Always using GC LABs now. | |
1212 || _g1->evacuation_failed() | |
1213 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1214 "Negative collection"); | |
1215 | |
1216 size_t freed_bytes = | |
1217 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1218 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
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1219 |
342 | 1220 double survival_fraction = |
1221 (double)surviving_bytes/ | |
1222 (double)_collection_set_bytes_used_before; | |
1223 | |
4023 | 1224 // These values are used to update the summary information that is |
1225 // displayed when TraceGen0Time is enabled, and are output as part | |
1226 // of the PrintGCDetails output, in the non-parallel case. | |
1227 | |
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1228 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1229 double satb_filtering_time = avg_value(_par_last_satb_filtering_times_ms); |
3823
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1230 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1231 double update_rs_processed_buffers = |
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1232 sum_of_values(_par_last_update_rs_processed_buffers); |
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1233 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1234 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1235 double termination_time = avg_value(_par_last_termination_times_ms); |
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1236 |
4023 | 1237 double known_time = ext_root_scan_time + |
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1238 satb_filtering_time + |
4023 | 1239 update_rs_time + |
1240 scan_rs_time + | |
1241 obj_copy_time; | |
1242 | |
1243 double other_time_ms = elapsed_ms; | |
1244 | |
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1245 // Subtract the root region scanning wait time. It's initialized to |
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1246 // zero at the start of the pause. |
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1247 other_time_ms -= _root_region_scan_wait_time_ms; |
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1248 |
4023 | 1249 if (parallel) { |
1250 other_time_ms -= _cur_collection_par_time_ms; | |
1251 } else { | |
1252 other_time_ms -= known_time; | |
1253 } | |
1254 | |
5986
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1255 // Now subtract the time taken to fix up roots in generated code |
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1256 other_time_ms -= _cur_collection_code_root_fixup_time_ms; |
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1257 |
4023 | 1258 // Subtract the time taken to clean the card table from the |
1259 // current value of "other time" | |
1260 other_time_ms -= _cur_clear_ct_time_ms; | |
1261 | |
1262 // TraceGen0Time and TraceGen1Time summary info updating. | |
1263 _all_pause_times_ms->add(elapsed_ms); | |
3823
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1264 |
595
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1265 if (update_stats) { |
4023 | 1266 _summary->record_total_time_ms(elapsed_ms); |
1267 _summary->record_other_time_ms(other_time_ms); | |
1268 | |
1269 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1270 assert(body_summary != NULL, "should not be null!"); | |
1271 | |
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1272 body_summary->record_root_region_scan_wait_time_ms( |
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1273 _root_region_scan_wait_time_ms); |
3823
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1274 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1275 body_summary->record_satb_filtering_time_ms(satb_filtering_time); |
3823
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1276 body_summary->record_update_rs_time_ms(update_rs_time); |
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1277 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1278 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1279 |
3823
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1280 if (parallel) { |
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1281 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1282 body_summary->record_termination_time_ms(termination_time); |
4023 | 1283 |
1284 double parallel_known_time = known_time + termination_time; | |
1285 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
3823
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1286 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1287 } |
4023 | 1288 |
1289 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
3823
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1290 |
342 | 1291 // We exempt parallel collection from this check because Alloc Buffer |
1292 // fragmentation can produce negative collections. Same with evac | |
1293 // failure. | |
1294 // Further, we're now always doing parallel collection. But I'm still | |
1295 // leaving this here as a placeholder for a more precise assertion later. | |
1296 // (DLD, 10/05. | |
1297 assert((true || parallel) | |
1298 || _g1->evacuation_failed() | |
1299 || surviving_bytes <= _collection_set_bytes_used_before, | |
1300 "Or else negative collection!"); | |
4023 | 1301 |
342 | 1302 // this is where we update the allocation rate of the application |
1303 double app_time_ms = | |
1304 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1305 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1306 // This usually happens due to the timer not having the required | |
1307 // granularity. Some Linuxes are the usual culprits. | |
1308 // We'll just set it to something (arbitrarily) small. | |
1309 app_time_ms = 1.0; | |
1310 } | |
4090
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1311 // We maintain the invariant that all objects allocated by mutator |
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1312 // threads will be allocated out of eden regions. So, we can use |
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1313 // the eden region number allocated since the previous GC to |
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1314 // calculate the application's allocate rate. The only exception |
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1315 // to that is humongous objects that are allocated separately. But |
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1316 // given that humongous object allocations do not really affect |
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1317 // either the pause's duration nor when the next pause will take |
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1318 // place we can safely ignore them here. |
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|
1319 size_t regions_allocated = eden_cset_region_length(); |
342 | 1320 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
1321 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1322 | |
1323 double interval_ms = | |
1324 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1325 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1326 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1327 if (recent_avg_pause_time_ratio() < 0.0 || |
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1328 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1329 #ifndef PRODUCT |
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1330 // Dump info to allow post-facto debugging |
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1331 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1332 gclog_or_tty->print_cr("-------------------------------------------"); |
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1333 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1334 _recent_gc_times_ms->dump(); |
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1335 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1336 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1337 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1338 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1339 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1340 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1341 #endif // !PRODUCT |
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1342 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1343 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1344 if (_recent_avg_pause_time_ratio < 0.0) { |
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1345 _recent_avg_pause_time_ratio = 0.0; |
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1346 } else { |
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1347 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1348 _recent_avg_pause_time_ratio = 1.0; |
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1349 } |
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1350 } |
342 | 1351 } |
1352 | |
4023 | 1353 for (int i = 0; i < _aux_num; ++i) { |
1354 if (_cur_aux_times_set[i]) { | |
1355 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1356 } | |
1357 } | |
1358 | |
1359 // PrintGCDetails output | |
342 | 1360 if (PrintGCDetails) { |
4023 | 1361 bool print_marking_info = |
1362 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1363 | |
1707 | 1364 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1365 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1366 elapsed_ms / 1000.0); | |
1367 | |
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1368 if (_root_region_scan_wait_time_ms > 0.0) { |
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1369 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms); |
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1370 } |
1707 | 1371 if (parallel) { |
1372 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1373 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1374 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1375 if (print_marking_info) { | |
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1376 print_par_stats(2, "SATB Filtering", _par_last_satb_filtering_times_ms); |
4023 | 1377 } |
1707 | 1378 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1379 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1707 | 1380 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1381 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1382 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1383 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1384 | |
1385 for (int i = 0; i < _parallel_gc_threads; i++) { | |
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1386 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - |
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1387 _par_last_gc_worker_start_times_ms[i]; |
4023 | 1388 |
1389 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
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1390 _par_last_satb_filtering_times_ms[i] + |
4023 | 1391 _par_last_update_rs_times_ms[i] + |
1392 _par_last_scan_rs_times_ms[i] + | |
1393 _par_last_obj_copy_times_ms[i] + | |
1394 _par_last_termination_times_ms[i]; | |
1395 | |
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1396 _par_last_gc_worker_other_times_ms[i] = _par_last_gc_worker_times_ms[i] - |
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1397 worker_known_time; |
2430 | 1398 } |
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1399 |
4023 | 1400 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); |
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1401 print_par_stats(2, "GC Worker Total", _par_last_gc_worker_times_ms); |
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1402 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
1707 | 1403 } else { |
4023 | 1404 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1405 if (print_marking_info) { | |
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1406 print_stats(1, "SATB Filtering", satb_filtering_time); |
4023 | 1407 } |
1707 | 1408 print_stats(1, "Update RS", update_rs_time); |
4023 | 1409 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
1707 | 1410 print_stats(1, "Scan RS", scan_rs_time); |
1411 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1412 } |
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1413 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms); |
4023 | 1414 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
890
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1415 #ifndef PRODUCT |
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1416 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1417 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1418 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1419 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1420 if (_num_cc_clears > 0) { |
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1421 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1422 } |
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1423 #endif |
342 | 1424 print_stats(1, "Other", other_time_ms); |
4097
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1425 print_stats(2, "Choose CSet", |
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1426 (_recorded_young_cset_choice_time_ms + |
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1427 _recorded_non_young_cset_choice_time_ms)); |
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1428 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1429 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
4097
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1430 print_stats(2, "Free CSet", |
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1431 (_recorded_young_free_cset_time_ms + |
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1432 _recorded_non_young_free_cset_time_ms)); |
1394
1316cec51b4d
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1433 |
342 | 1434 for (int i = 0; i < _aux_num; ++i) { |
1435 if (_cur_aux_times_set[i]) { | |
1436 char buffer[96]; | |
1437 sprintf(buffer, "Aux%d", i); | |
1438 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1439 } | |
1440 } | |
1441 } | |
1442 | |
1443 // Update the efficiency-since-mark vars. | |
1444 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1445 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1446 // This usually happens due to the timer not having the required | |
1447 // granularity. Some Linuxes are the usual culprits. | |
1448 // We'll just set it to something (arbitrarily) small. | |
1449 proc_ms = 1.0; | |
1450 } | |
1451 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1452 | |
1453 bool new_in_marking_window = _in_marking_window; | |
1454 bool new_in_marking_window_im = false; | |
1359
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1455 if (during_initial_mark_pause()) { |
342 | 1456 new_in_marking_window = true; |
1457 new_in_marking_window_im = true; | |
1458 } | |
1459 | |
4710 | 1460 if (_last_young_gc) { |
4912
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1461 // This is supposed to to be the "last young GC" before we start |
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1462 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1463 |
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1464 if (!last_pause_included_initial_mark) { |
4912
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1465 if (next_gc_should_be_mixed("start mixed GCs", |
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1466 "do not start mixed GCs")) { |
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1467 set_gcs_are_young(false); |
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1468 } |
3982
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1469 } else { |
4710 | 1470 ergo_verbose0(ErgoMixedGCs, |
1471 "do not start mixed GCs", | |
3982
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1472 ergo_format_reason("concurrent cycle is about to start")); |
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1473 } |
4710 | 1474 _last_young_gc = false; |
3867
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1475 } |
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1476 |
4710 | 1477 if (!_last_gc_was_young) { |
4912
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1478 // This is a mixed GC. Here we decide whether to continue doing |
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1479 // mixed GCs or not. |
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1480 |
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1481 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1482 "do not continue mixed GCs")) { |
4710 | 1483 set_gcs_are_young(true); |
342 | 1484 } |
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1485 } |
4710 | 1486 |
1487 if (_last_gc_was_young && !_during_marking) { | |
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1488 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1489 } |
1490 | |
1491 _short_lived_surv_rate_group->start_adding_regions(); | |
1492 // do that for any other surv rate groupsx | |
1493 | |
677 | 1494 if (update_stats) { |
342 | 1495 double pause_time_ms = elapsed_ms; |
1496 | |
1497 size_t diff = 0; | |
1498 if (_max_pending_cards >= _pending_cards) | |
1499 diff = _max_pending_cards - _pending_cards; | |
1500 _pending_card_diff_seq->add((double) diff); | |
1501 | |
1502 double cost_per_card_ms = 0.0; | |
1503 if (_pending_cards > 0) { | |
1504 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1505 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1506 } | |
1507 | |
1508 size_t cards_scanned = _g1->cards_scanned(); | |
1509 | |
1510 double cost_per_entry_ms = 0.0; | |
1511 if (cards_scanned > 10) { | |
1512 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
4710 | 1513 if (_last_gc_was_young) { |
342 | 1514 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1515 } else { |
1516 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1517 } | |
342 | 1518 } |
1519 | |
1520 if (_max_rs_lengths > 0) { | |
1521 double cards_per_entry_ratio = | |
1522 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1523 if (_last_gc_was_young) { |
1524 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1525 } else { | |
1526 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1527 } | |
342 | 1528 } |
1529 | |
4727
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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1530 // This is defensive. For a while _max_rs_lengths could get |
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1531 // smaller than _recorded_rs_lengths which was causing |
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1532 // rs_length_diff to get very large and mess up the RSet length |
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1533 // predictions. The reason was unsafe concurrent updates to the |
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1534 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1535 // against (see CR 7118202). This bug has now been fixed (see CR |
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1536 // 7119027). However, I'm still worried that |
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1537 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1538 // inaccurate. The concurrent refinement thread calculates an |
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1539 // RSet's length concurrently with other CR threads updating it |
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1540 // which might cause it to calculate the length incorrectly (if, |
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1541 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1542 // conditional below just in case. |
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1543 size_t rs_length_diff = 0; |
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1544 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1545 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1546 } |
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1547 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1548 |
1549 size_t copied_bytes = surviving_bytes; | |
1550 double cost_per_byte_ms = 0.0; | |
1551 if (copied_bytes > 0) { | |
1552 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
4710 | 1553 if (_in_marking_window) { |
342 | 1554 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1555 } else { |
342 | 1556 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1557 } |
342 | 1558 } |
1559 | |
1560 double all_other_time_ms = pause_time_ms - | |
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1561 (update_rs_time + scan_rs_time + obj_copy_time + termination_time); |
342 | 1562 |
1563 double young_other_time_ms = 0.0; | |
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1564 if (young_cset_region_length() > 0) { |
342 | 1565 young_other_time_ms = |
1566 _recorded_young_cset_choice_time_ms + | |
1567 _recorded_young_free_cset_time_ms; | |
1568 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1569 (double) young_cset_region_length()); |
342 | 1570 } |
1571 double non_young_other_time_ms = 0.0; | |
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1572 if (old_cset_region_length() > 0) { |
342 | 1573 non_young_other_time_ms = |
1574 _recorded_non_young_cset_choice_time_ms + | |
1575 _recorded_non_young_free_cset_time_ms; | |
1576 | |
1577 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1578 (double) old_cset_region_length()); |
342 | 1579 } |
1580 | |
1581 double constant_other_time_ms = all_other_time_ms - | |
1582 (young_other_time_ms + non_young_other_time_ms); | |
1583 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1584 | |
1585 double survival_ratio = 0.0; | |
1586 if (_bytes_in_collection_set_before_gc > 0) { | |
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1587 survival_ratio = (double) _bytes_copied_during_gc / |
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1588 (double) _bytes_in_collection_set_before_gc; |
342 | 1589 } |
1590 | |
1591 _pending_cards_seq->add((double) _pending_cards); | |
1592 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1593 } | |
1594 | |
1595 _in_marking_window = new_in_marking_window; | |
1596 _in_marking_window_im = new_in_marking_window_im; | |
1597 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1598 update_young_list_target_length(); |
342 | 1599 |
1111 | 1600 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1601 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1602 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1603 |
1604 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1605 } |
1606 | |
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1607 #define EXT_SIZE_FORMAT "%d%s" |
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1608 #define EXT_SIZE_PARAMS(bytes) \ |
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1609 byte_size_in_proper_unit((bytes)), \ |
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1610 proper_unit_for_byte_size((bytes)) |
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1611 |
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1612 void G1CollectorPolicy::print_heap_transition() { |
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1613 if (PrintGCDetails) { |
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1614 YoungList* young_list = _g1->young_list(); |
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1615 size_t eden_bytes = young_list->eden_used_bytes(); |
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1616 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1617 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1618 size_t used = _g1->used(); |
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1619 size_t capacity = _g1->capacity(); |
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1620 size_t eden_capacity = |
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1621 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1622 |
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1623 gclog_or_tty->print_cr( |
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1624 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1625 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1626 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1627 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1628 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1629 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1630 EXT_SIZE_PARAMS(eden_bytes), |
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1631 EXT_SIZE_PARAMS(eden_capacity), |
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1632 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1633 EXT_SIZE_PARAMS(survivor_bytes), |
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1634 EXT_SIZE_PARAMS(used_before_gc), |
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1635 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1636 EXT_SIZE_PARAMS(used), |
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1637 EXT_SIZE_PARAMS(capacity)); |
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1638 |
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1639 _prev_eden_capacity = eden_capacity; |
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1640 } else if (PrintGC) { |
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1641 _g1->print_size_transition(gclog_or_tty, |
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1642 _cur_collection_pause_used_at_start_bytes, |
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1643 _g1->used(), _g1->capacity()); |
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1644 } |
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1645 } |
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1646 |
1111 | 1647 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1648 double update_rs_processed_buffers, | |
1649 double goal_ms) { | |
1650 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1651 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1652 | |
1282 | 1653 if (G1UseAdaptiveConcRefinement) { |
1111 | 1654 const int k_gy = 3, k_gr = 6; |
1655 const double inc_k = 1.1, dec_k = 0.9; | |
1656 | |
1657 int g = cg1r->green_zone(); | |
1658 if (update_rs_time > goal_ms) { | |
1659 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1660 } else { | |
1661 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1662 g = (int)MAX2(g * inc_k, g + 1.0); | |
1663 } | |
1664 } | |
1665 // Change the refinement threads params | |
1666 cg1r->set_green_zone(g); | |
1667 cg1r->set_yellow_zone(g * k_gy); | |
1668 cg1r->set_red_zone(g * k_gr); | |
1669 cg1r->reinitialize_threads(); | |
1670 | |
1671 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1672 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1673 cg1r->yellow_zone()); | |
1674 // Change the barrier params | |
1675 dcqs.set_process_completed_threshold(processing_threshold); | |
1676 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1677 } | |
1678 | |
1679 int curr_queue_size = dcqs.completed_buffers_num(); | |
1680 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1681 dcqs.set_completed_queue_padding(curr_queue_size); | |
1682 } else { | |
1683 dcqs.set_completed_queue_padding(0); | |
1684 } | |
1685 dcqs.notify_if_necessary(); | |
1686 } | |
1687 | |
342 | 1688 double |
1689 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1690 size_t rs_length = predict_rs_length_diff(); | |
1691 size_t card_num; | |
4710 | 1692 if (gcs_are_young()) { |
342 | 1693 card_num = predict_young_card_num(rs_length); |
4710 | 1694 } else { |
342 | 1695 card_num = predict_non_young_card_num(rs_length); |
4710 | 1696 } |
342 | 1697 return predict_base_elapsed_time_ms(pending_cards, card_num); |
1698 } | |
1699 | |
1700 double | |
1701 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1702 size_t scanned_cards) { | |
1703 return | |
1704 predict_rs_update_time_ms(pending_cards) + | |
1705 predict_rs_scan_time_ms(scanned_cards) + | |
1706 predict_constant_other_time_ms(); | |
1707 } | |
1708 | |
1709 double | |
1710 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1711 bool young) { | |
1712 size_t rs_length = hr->rem_set()->occupied(); | |
1713 size_t card_num; | |
4710 | 1714 if (gcs_are_young()) { |
342 | 1715 card_num = predict_young_card_num(rs_length); |
4710 | 1716 } else { |
342 | 1717 card_num = predict_non_young_card_num(rs_length); |
4710 | 1718 } |
342 | 1719 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1720 | |
1721 double region_elapsed_time_ms = | |
1722 predict_rs_scan_time_ms(card_num) + | |
1723 predict_object_copy_time_ms(bytes_to_copy); | |
1724 | |
1725 if (young) | |
1726 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1727 else | |
1728 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1729 | |
1730 return region_elapsed_time_ms; | |
1731 } | |
1732 | |
1733 size_t | |
1734 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1735 size_t bytes_to_copy; | |
1736 if (hr->is_marked()) | |
1737 bytes_to_copy = hr->max_live_bytes(); | |
1738 else { | |
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1739 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1740 int age = hr->age_in_surv_rate_group(); |
545 | 1741 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1742 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1743 } | |
1744 return bytes_to_copy; | |
1745 } | |
1746 | |
1747 void | |
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1748 G1CollectorPolicy::init_cset_region_lengths(size_t eden_cset_region_length, |
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1749 size_t survivor_cset_region_length) { |
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1750 _eden_cset_region_length = eden_cset_region_length; |
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1751 _survivor_cset_region_length = survivor_cset_region_length; |
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1752 _old_cset_region_length = 0; |
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1753 } |
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1754 |
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1755 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1756 _recorded_rs_lengths = rs_lengths; |
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1757 } |
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1758 |
342 | 1759 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1760 double elapsed_ms) { | |
1761 _recent_gc_times_ms->add(elapsed_ms); | |
1762 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1763 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1764 } | |
1765 | |
1766 size_t G1CollectorPolicy::expansion_amount() { | |
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1767 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1768 double threshold = _gc_overhead_perc; |
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1769 if (recent_gc_overhead > threshold) { |
751 | 1770 // We will double the existing space, or take |
1771 // G1ExpandByPercentOfAvailable % of the available expansion | |
1772 // space, whichever is smaller, bounded below by a minimum | |
1773 // expansion (unless that's all that's left.) | |
342 | 1774 const size_t min_expand_bytes = 1*M; |
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1775 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1776 size_t committed_bytes = _g1->capacity(); |
1777 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1778 size_t expand_bytes; | |
1779 size_t expand_bytes_via_pct = | |
751 | 1780 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1781 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1782 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1783 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1784 |
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1785 ergo_verbose5(ErgoHeapSizing, |
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1786 "attempt heap expansion", |
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1787 ergo_format_reason("recent GC overhead higher than " |
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1788 "threshold after GC") |
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1789 ergo_format_perc("recent GC overhead") |
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1790 ergo_format_perc("threshold") |
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1791 ergo_format_byte("uncommitted") |
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1792 ergo_format_byte_perc("calculated expansion amount"), |
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1793 recent_gc_overhead, threshold, |
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1794 uncommitted_bytes, |
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1795 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1796 |
342 | 1797 return expand_bytes; |
1798 } else { | |
1799 return 0; | |
1800 } | |
1801 } | |
1802 | |
1803 class CountCSClosure: public HeapRegionClosure { | |
1804 G1CollectorPolicy* _g1_policy; | |
1805 public: | |
1806 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1807 _g1_policy(g1_policy) {} | |
1808 bool doHeapRegion(HeapRegion* r) { | |
1809 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1810 return false; | |
1811 } | |
1812 }; | |
1813 | |
1814 void G1CollectorPolicy::count_CS_bytes_used() { | |
1815 CountCSClosure cs_closure(this); | |
1816 _g1->collection_set_iterate(&cs_closure); | |
1817 } | |
1818 | |
4023 | 1819 void G1CollectorPolicy::print_summary(int level, |
1820 const char* str, | |
1821 NumberSeq* seq) const { | |
342 | 1822 double sum = seq->sum(); |
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1823 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1824 str, sum / 1000.0, seq->avg()); |
1825 } | |
1826 | |
4023 | 1827 void G1CollectorPolicy::print_summary_sd(int level, |
1828 const char* str, | |
1829 NumberSeq* seq) const { | |
342 | 1830 print_summary(level, str, seq); |
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1831 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1832 seq->num(), seq->sd(), seq->maximum()); |
1833 } | |
1834 | |
1835 void G1CollectorPolicy::check_other_times(int level, | |
1836 NumberSeq* other_times_ms, | |
1837 NumberSeq* calc_other_times_ms) const { | |
1838 bool should_print = false; | |
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1839 LineBuffer buf(level + 2); |
342 | 1840 |
1841 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1842 fabs(calc_other_times_ms->sum())); | |
1843 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1844 fabs(calc_other_times_ms->sum())); | |
1845 double sum_ratio = max_sum / min_sum; | |
1846 if (sum_ratio > 1.1) { | |
1847 should_print = true; | |
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1848 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1849 } |
1850 | |
1851 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1852 fabs(calc_other_times_ms->avg())); | |
1853 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1854 fabs(calc_other_times_ms->avg())); | |
1855 double avg_ratio = max_avg / min_avg; | |
1856 if (avg_ratio > 1.1) { | |
1857 should_print = true; | |
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1858 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1859 } |
1860 | |
1861 if (other_times_ms->sum() < -0.01) { | |
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1862 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1863 } |
1864 | |
1865 if (other_times_ms->avg() < -0.01) { | |
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1866 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1867 } |
1868 | |
1869 if (calc_other_times_ms->sum() < -0.01) { | |
1870 should_print = true; | |
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1871 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1872 } |
1873 | |
1874 if (calc_other_times_ms->avg() < -0.01) { | |
1875 should_print = true; | |
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1876 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1877 } |
1878 | |
1879 if (should_print) | |
1880 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1881 } | |
1882 | |
1883 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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1884 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1885 MainBodySummary* body_summary = summary->main_body_summary(); |
1886 if (summary->get_total_seq()->num() > 0) { | |
677 | 1887 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1888 if (body_summary != NULL) { |
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1889 print_summary(1, "Root Region Scan Wait", body_summary->get_root_region_scan_wait_seq()); |
342 | 1890 if (parallel) { |
1891 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 1892 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1893 print_summary(2, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1894 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
1895 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
1896 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
1897 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 1898 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 1899 { |
1900 NumberSeq* other_parts[] = { | |
1901 body_summary->get_ext_root_scan_seq(), | |
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1902 body_summary->get_satb_filtering_seq(), |
4023 | 1903 body_summary->get_update_rs_seq(), |
342 | 1904 body_summary->get_scan_rs_seq(), |
1905 body_summary->get_obj_copy_seq(), | |
1906 body_summary->get_termination_seq() | |
1907 }; | |
1908 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 1909 6, other_parts); |
342 | 1910 check_other_times(2, body_summary->get_parallel_other_seq(), |
1911 &calc_other_times_ms); | |
1912 } | |
1913 } else { | |
4023 | 1914 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1915 print_summary(1, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1916 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
1917 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
1918 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
1919 } | |
1920 } | |
4023 | 1921 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); |
342 | 1922 print_summary(1, "Other", summary->get_other_seq()); |
1923 { | |
1779 | 1924 if (body_summary != NULL) { |
1925 NumberSeq calc_other_times_ms; | |
1926 if (parallel) { | |
1927 // parallel | |
1928 NumberSeq* other_parts[] = { | |
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1929 body_summary->get_root_region_scan_wait_seq(), |
1779 | 1930 body_summary->get_parallel_seq(), |
1931 body_summary->get_clear_ct_seq() | |
1932 }; | |
1933 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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1934 3, other_parts); |
1779 | 1935 } else { |
1936 // serial | |
1937 NumberSeq* other_parts[] = { | |
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1938 body_summary->get_root_region_scan_wait_seq(), |
1779 | 1939 body_summary->get_update_rs_seq(), |
1940 body_summary->get_ext_root_scan_seq(), | |
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1941 body_summary->get_satb_filtering_seq(), |
1779 | 1942 body_summary->get_scan_rs_seq(), |
1943 body_summary->get_obj_copy_seq() | |
1944 }; | |
1945 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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1946 6, other_parts); |
1779 | 1947 } |
1948 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 1949 } |
1950 } | |
1951 } else { | |
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1952 LineBuffer(1).append_and_print_cr("none"); |
342 | 1953 } |
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1954 LineBuffer(0).append_and_print_cr(""); |
342 | 1955 } |
1956 | |
1957 void G1CollectorPolicy::print_tracing_info() const { | |
1958 if (TraceGen0Time) { | |
1959 gclog_or_tty->print_cr("ALL PAUSES"); | |
1960 print_summary_sd(0, "Total", _all_pause_times_ms); | |
1961 gclog_or_tty->print_cr(""); | |
1962 gclog_or_tty->print_cr(""); | |
4710 | 1963 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
1964 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); | |
342 | 1965 gclog_or_tty->print_cr(""); |
1966 | |
677 | 1967 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
1968 print_summary(_summary); | |
342 | 1969 |
1970 gclog_or_tty->print_cr("MISC"); | |
1971 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
1972 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
1973 for (int i = 0; i < _aux_num; ++i) { | |
1974 if (_all_aux_times_ms[i].num() > 0) { | |
1975 char buffer[96]; | |
1976 sprintf(buffer, "Aux%d", i); | |
1977 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
1978 } | |
1979 } | |
1980 } | |
1981 if (TraceGen1Time) { | |
1982 if (_all_full_gc_times_ms->num() > 0) { | |
1983 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
1984 _all_full_gc_times_ms->num(), | |
1985 _all_full_gc_times_ms->sum() / 1000.0); | |
1986 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
1987 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
1988 _all_full_gc_times_ms->sd(), | |
1989 _all_full_gc_times_ms->maximum()); | |
1990 } | |
1991 } | |
1992 } | |
1993 | |
1994 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
1995 #ifndef PRODUCT | |
1996 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
1997 // add this call for any other surv rate groups | |
1998 #endif // PRODUCT | |
1999 } | |
2000 | |
2001 #ifndef PRODUCT | |
2002 // for debugging, bit of a hack... | |
2003 static char* | |
2004 region_num_to_mbs(int length) { | |
2005 static char buffer[64]; | |
2006 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2007 double mbs = bytes / (double) (1024 * 1024); | |
2008 sprintf(buffer, "%7.2lfMB", mbs); | |
2009 return buffer; | |
2010 } | |
2011 #endif // PRODUCT | |
2012 | |
545 | 2013 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2014 switch (purpose) { |
2015 case GCAllocForSurvived: | |
545 | 2016 return _max_survivor_regions; |
342 | 2017 case GCAllocForTenured: |
545 | 2018 return REGIONS_UNLIMITED; |
342 | 2019 default: |
545 | 2020 ShouldNotReachHere(); |
2021 return REGIONS_UNLIMITED; | |
342 | 2022 }; |
2023 } | |
2024 | |
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2025 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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2026 size_t expansion_region_num = 0; |
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2027 if (GCLockerEdenExpansionPercent > 0) { |
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2028 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2029 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2030 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2031 // less than 1.0) we'll get 1. |
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2032 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2033 } else { |
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2034 assert(expansion_region_num == 0, "sanity"); |
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2035 } |
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2036 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2037 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2038 } |
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2039 |
545 | 2040 // Calculates survivor space parameters. |
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2041 void G1CollectorPolicy::update_survivors_policy() { |
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2042 double max_survivor_regions_d = |
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2043 (double) _young_list_target_length / (double) SurvivorRatio; |
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2044 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2045 // smaller than 1.0) we'll get 1. |
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2046 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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2047 |
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2048 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2049 HeapRegion::GrainWords * _max_survivor_regions); |
2050 } | |
2051 | |
342 | 2052 #ifndef PRODUCT |
2053 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2054 CollectionSetChooser* _chooser; | |
2055 public: | |
2056 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2057 _chooser(chooser) {} | |
2058 | |
2059 bool doHeapRegion(HeapRegion* r) { | |
2060 if (!r->continuesHumongous()) { | |
2061 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2062 } | |
2063 return false; | |
2064 } | |
2065 }; | |
2066 | |
4013 | 2067 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2068 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2069 _g1->heap_region_iterate(&cl); | |
2070 return true; | |
2071 } | |
2072 #endif | |
2073 | |
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2074 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2075 GCCause::Cause gc_cause) { |
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2076 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2077 if (!during_cycle) { |
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2078 ergo_verbose1(ErgoConcCycles, |
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2079 "request concurrent cycle initiation", |
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2080 ergo_format_reason("requested by GC cause") |
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2081 ergo_format_str("GC cause"), |
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2082 GCCause::to_string(gc_cause)); |
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2083 set_initiate_conc_mark_if_possible(); |
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2084 return true; |
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2085 } else { |
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2086 ergo_verbose1(ErgoConcCycles, |
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2087 "do not request concurrent cycle initiation", |
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2088 ergo_format_reason("concurrent cycle already in progress") |
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2089 ergo_format_str("GC cause"), |
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2090 GCCause::to_string(gc_cause)); |
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2091 return false; |
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2092 } |
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2093 } |
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2094 |
342 | 2095 void |
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2096 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2097 // We are about to decide on whether this pause will be an |
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2098 // initial-mark pause. |
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2099 |
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2100 // First, during_initial_mark_pause() should not be already set. We |
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2101 // will set it here if we have to. However, it should be cleared by |
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2102 // the end of the pause (it's only set for the duration of an |
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2103 // initial-mark pause). |
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2104 assert(!during_initial_mark_pause(), "pre-condition"); |
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2105 |
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2106 if (initiate_conc_mark_if_possible()) { |
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2107 // We had noticed on a previous pause that the heap occupancy has |
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2108 // gone over the initiating threshold and we should start a |
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2109 // concurrent marking cycle. So we might initiate one. |
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2110 |
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2111 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2112 if (!during_cycle) { |
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2113 // The concurrent marking thread is not "during a cycle", i.e., |
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2114 // it has completed the last one. So we can go ahead and |
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2115 // initiate a new cycle. |
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2116 |
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2117 set_during_initial_mark_pause(); |
4710 | 2118 // We do not allow mixed GCs during marking. |
2119 if (!gcs_are_young()) { | |
2120 set_gcs_are_young(true); | |
2121 ergo_verbose0(ErgoMixedGCs, | |
2122 "end mixed GCs", | |
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2123 ergo_format_reason("concurrent cycle is about to start")); |
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2124 } |
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2125 |
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2126 // And we can now clear initiate_conc_mark_if_possible() as |
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2127 // we've already acted on it. |
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2128 clear_initiate_conc_mark_if_possible(); |
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2129 |
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2130 ergo_verbose0(ErgoConcCycles, |
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2131 "initiate concurrent cycle", |
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2132 ergo_format_reason("concurrent cycle initiation requested")); |
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2133 } else { |
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2134 // The concurrent marking thread is still finishing up the |
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2135 // previous cycle. If we start one right now the two cycles |
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2136 // overlap. In particular, the concurrent marking thread might |
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2137 // be in the process of clearing the next marking bitmap (which |
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2138 // we will use for the next cycle if we start one). Starting a |
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2139 // cycle now will be bad given that parts of the marking |
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2140 // information might get cleared by the marking thread. And we |
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2141 // cannot wait for the marking thread to finish the cycle as it |
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2142 // periodically yields while clearing the next marking bitmap |
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2143 // and, if it's in a yield point, it's waiting for us to |
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2144 // finish. So, at this point we will not start a cycle and we'll |
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2145 // let the concurrent marking thread complete the last one. |
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2146 ergo_verbose0(ErgoConcCycles, |
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2147 "do not initiate concurrent cycle", |
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2148 ergo_format_reason("concurrent cycle already in progress")); |
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2149 } |
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2150 } |
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2151 } |
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2152 |
342 | 2153 class KnownGarbageClosure: public HeapRegionClosure { |
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2154 G1CollectedHeap* _g1h; |
342 | 2155 CollectionSetChooser* _hrSorted; |
2156 | |
2157 public: | |
2158 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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2159 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 2160 |
2161 bool doHeapRegion(HeapRegion* r) { | |
2162 // We only include humongous regions in collection | |
2163 // sets when concurrent mark shows that their contained object is | |
2164 // unreachable. | |
2165 | |
2166 // Do we have any marking information for this region? | |
2167 if (r->is_marked()) { | |
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2168 // We will skip any region that's currently used as an old GC |
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2169 // alloc region (we should not consider those for collection |
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2170 // before we fill them up). |
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2171 if (_hrSorted->shouldAdd(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 2172 _hrSorted->addMarkedHeapRegion(r); |
2173 } | |
2174 } | |
2175 return false; | |
2176 } | |
2177 }; | |
2178 | |
2179 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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2180 G1CollectedHeap* _g1h; |
342 | 2181 CollectionSetChooser* _hrSorted; |
2182 jint _marked_regions_added; | |
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2183 size_t _reclaimable_bytes_added; |
342 | 2184 jint _chunk_size; |
2185 jint _cur_chunk_idx; | |
2186 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2187 int _worker; | |
2188 int _invokes; | |
2189 | |
2190 void get_new_chunk() { | |
2191 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2192 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2193 } | |
2194 void add_region(HeapRegion* r) { | |
2195 if (_cur_chunk_idx == _cur_chunk_end) { | |
2196 get_new_chunk(); | |
2197 } | |
2198 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2199 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2200 _marked_regions_added++; | |
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2201 _reclaimable_bytes_added += r->reclaimable_bytes(); |
342 | 2202 _cur_chunk_idx++; |
2203 } | |
2204 | |
2205 public: | |
2206 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2207 jint chunk_size, | |
2208 int worker) : | |
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2209 _g1h(G1CollectedHeap::heap()), |
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2210 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), |
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2211 _marked_regions_added(0), _reclaimable_bytes_added(0), |
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2212 _cur_chunk_idx(0), _cur_chunk_end(0), _invokes(0) { } |
342 | 2213 |
2214 bool doHeapRegion(HeapRegion* r) { | |
2215 // We only include humongous regions in collection | |
2216 // sets when concurrent mark shows that their contained object is | |
2217 // unreachable. | |
2218 _invokes++; | |
2219 | |
2220 // Do we have any marking information for this region? | |
2221 if (r->is_marked()) { | |
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2222 // We will skip any region that's currently used as an old GC |
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2223 // alloc region (we should not consider those for collection |
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2224 // before we fill them up). |
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2225 if (_hrSorted->shouldAdd(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 2226 add_region(r); |
2227 } | |
2228 } | |
2229 return false; | |
2230 } | |
2231 jint marked_regions_added() { return _marked_regions_added; } | |
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2232 size_t reclaimable_bytes_added() { return _reclaimable_bytes_added; } |
342 | 2233 int invokes() { return _invokes; } |
2234 }; | |
2235 | |
2236 class ParKnownGarbageTask: public AbstractGangTask { | |
2237 CollectionSetChooser* _hrSorted; | |
2238 jint _chunk_size; | |
2239 G1CollectedHeap* _g1; | |
2240 public: | |
2241 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2242 AbstractGangTask("ParKnownGarbageTask"), | |
2243 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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2244 _g1(G1CollectedHeap::heap()) { } |
342 | 2245 |
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2246 void work(uint worker_id) { |
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2247 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, |
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2248 _chunk_size, |
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2249 worker_id); |
342 | 2250 // Back to zero for the claim value. |
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2251 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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2252 _g1->workers()->active_workers(), |
355 | 2253 HeapRegion::InitialClaimValue); |
342 | 2254 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
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2255 size_t reclaimable_bytes_added = |
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2256 parKnownGarbageCl.reclaimable_bytes_added(); |
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2257 _hrSorted->updateTotals(regions_added, reclaimable_bytes_added); |
342 | 2258 if (G1PrintParCleanupStats) { |
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2259 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
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2260 worker_id, parKnownGarbageCl.invokes(), regions_added); |
342 | 2261 } |
2262 } | |
2263 }; | |
2264 | |
2265 void | |
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2266 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
4013 | 2267 double start_sec; |
2268 if (G1PrintParCleanupStats) { | |
2269 start_sec = os::elapsedTime(); | |
2270 } | |
342 | 2271 |
2272 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2273 double clear_marked_end_sec; |
342 | 2274 if (G1PrintParCleanupStats) { |
4013 | 2275 clear_marked_end_sec = os::elapsedTime(); |
2276 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2277 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2278 } |
4013 | 2279 |
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2280 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2281 const size_t OverpartitionFactor = 4; |
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2282 size_t WorkUnit; |
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2283 // The use of MinChunkSize = 8 in the original code |
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2284 // causes some assertion failures when the total number of |
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2285 // region is less than 8. The code here tries to fix that. |
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2286 // Should the original code also be fixed? |
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2287 if (no_of_gc_threads > 0) { |
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2288 const size_t MinWorkUnit = |
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2289 MAX2(_g1->n_regions() / no_of_gc_threads, (size_t) 1U); |
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2290 WorkUnit = |
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2291 MAX2(_g1->n_regions() / (no_of_gc_threads * OverpartitionFactor), |
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2292 MinWorkUnit); |
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2293 } else { |
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2294 assert(no_of_gc_threads > 0, |
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2295 "The active gc workers should be greater than 0"); |
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2296 // In a product build do something reasonable to avoid a crash. |
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2297 const size_t MinWorkUnit = |
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2298 MAX2(_g1->n_regions() / ParallelGCThreads, (size_t) 1U); |
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2299 WorkUnit = |
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2300 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2301 MinWorkUnit); |
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2302 } |
342 | 2303 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2304 WorkUnit); |
342 | 2305 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2306 (int) WorkUnit); |
342 | 2307 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2308 |
2309 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2310 "sanity check"); | |
342 | 2311 } else { |
2312 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2313 _g1->heap_region_iterate(&knownGarbagecl); | |
2314 } | |
4013 | 2315 double known_garbage_end_sec; |
342 | 2316 if (G1PrintParCleanupStats) { |
4013 | 2317 known_garbage_end_sec = os::elapsedTime(); |
342 | 2318 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2319 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2320 } |
4013 | 2321 |
342 | 2322 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2323 double end_sec = os::elapsedTime(); |
342 | 2324 if (G1PrintParCleanupStats) { |
2325 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2326 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2327 } |
2328 | |
4013 | 2329 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2330 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2331 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2332 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2333 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2334 } |
2335 | |
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2336 // Add the heap region at the head of the non-incremental collection set |
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2337 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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2338 assert(_inc_cset_build_state == Active, "Precondition"); |
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2339 assert(!hr->is_young(), "non-incremental add of young region"); |
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2340 |
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2341 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2342 hr->set_in_collection_set(true); |
2343 hr->set_next_in_collection_set(_collection_set); | |
2344 _collection_set = hr; | |
2345 _collection_set_bytes_used_before += hr->used(); | |
526 | 2346 _g1->register_region_with_in_cset_fast_test(hr); |
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2347 size_t rs_length = hr->rem_set()->occupied(); |
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2348 _recorded_rs_lengths += rs_length; |
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2349 _old_cset_region_length += 1; |
342 | 2350 } |
2351 | |
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2352 // Initialize the per-collection-set information |
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2353 void G1CollectorPolicy::start_incremental_cset_building() { |
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2354 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2355 |
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2356 _inc_cset_head = NULL; |
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2357 _inc_cset_tail = NULL; |
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2358 _inc_cset_bytes_used_before = 0; |
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2359 |
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2360 _inc_cset_max_finger = 0; |
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2361 _inc_cset_recorded_rs_lengths = 0; |
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2362 _inc_cset_recorded_rs_lengths_diffs = 0; |
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2363 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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2364 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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2365 _inc_cset_build_state = Active; |
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2366 } |
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2367 |
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2368 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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2369 assert(_inc_cset_build_state == Active, "Precondition"); |
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2370 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2371 |
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2372 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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2373 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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2374 // that adds a new region to the CSet. Further updates by the |
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2375 // concurrent refinement thread that samples the young RSet lengths |
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2376 // are accumulated in the *_diffs fields. Here we add the diffs to |
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2377 // the "main" fields. |
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2378 |
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2379 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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2380 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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2381 } else { |
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2382 // This is defensive. The diff should in theory be always positive |
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2383 // as RSets can only grow between GCs. However, given that we |
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2384 // sample their size concurrently with other threads updating them |
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2385 // it's possible that we might get the wrong size back, which |
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2386 // could make the calculations somewhat inaccurate. |
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2387 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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2388 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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2389 _inc_cset_recorded_rs_lengths -= diffs; |
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2390 } else { |
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2391 _inc_cset_recorded_rs_lengths = 0; |
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2392 } |
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2393 } |
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2394 _inc_cset_predicted_elapsed_time_ms += |
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2395 _inc_cset_predicted_elapsed_time_ms_diffs; |
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2396 |
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2397 _inc_cset_recorded_rs_lengths_diffs = 0; |
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2398 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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2399 } |
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2400 |
1394
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2401 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2402 // This routine is used when: |
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johnc
parents:
1391
diff
changeset
|
2403 // * adding survivor regions to the incremental cset at the end of an |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2404 // evacuation pause, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2405 // * adding the current allocation region to the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2406 // when it is retired, and |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2407 // * updating existing policy information for a region in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2408 // incremental cset via young list RSet sampling. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2409 // Therefore this routine may be called at a safepoint by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2410 // VM thread, or in-between safepoints by mutator threads (when |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2411 // retiring the current allocation region) or a concurrent |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2412 // refine thread (RSet sampling). |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2413 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2414 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2415 size_t used_bytes = hr->used(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2416 _inc_cset_recorded_rs_lengths += rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2417 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2418 _inc_cset_bytes_used_before += used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2419 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2420 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2421 // in the heap region in case we have to remove this region from |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2422 // 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
|
2423 // rset sampling code |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2424 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:
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diff
changeset
|
2425 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
|
2426 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2427 |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2428 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2429 size_t new_rs_length) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2430 // Update the CSet information that is dependent on the new RS length |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2431 assert(hr->is_young(), "Precondition"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2432 assert(!SafepointSynchronize::is_at_safepoint(), |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2433 "should not be at a safepoint"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2434 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2435 // 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
|
2436 // _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
|
2437 // 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
|
2438 // 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
|
2439 // 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
|
2440 // 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
|
2441 // 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
|
2442 // fields at the start of a GC. |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2443 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2444 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
|
2445 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
|
2446 _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
|
2447 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2448 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
|
2449 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
|
2450 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
|
2451 _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
|
2452 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2453 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
|
2454 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2455 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2456 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2457 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
|
2458 assert(hr->is_young(), "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2459 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
|
2460 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
|
2461 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2462 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2463 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2464 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2465 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2466 // and cached in the heap region here (initially) and (subsequently) |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2467 // 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
|
2468 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2469 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2470 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
|
2471 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2472 HeapWord* hr_end = hr->end(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2473 _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
|
2474 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2475 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
|
2476 hr->set_in_collection_set(true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2477 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
|
2478 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2479 _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
|
2480 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2481 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2482 // 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
|
2483 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
|
2484 // 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
|
2485 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
|
2486 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2487 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2488 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
|
2489 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2490 // 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
|
2491 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
|
2492 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
|
2493 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2494 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2495 _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
|
2496 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2497 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2498 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2499 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2500 // 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
|
2501 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
|
2502 // 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
|
2503 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
|
2504 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2505 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2506 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
|
2507 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2508 // 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
|
2509 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
|
2510 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
|
2511 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
|
2512 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2513 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2514 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2515 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2516 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2517 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2518 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
|
2519 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
|
2520 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2521 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
|
2522 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2523 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2524 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
|
2525 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
|
2526 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
|
2527 "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
|
2528 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2529 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2530 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
|
2531 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
|
2532 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
|
2533 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
|
2534 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2535 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2536 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2537 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2538 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2539 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2540 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2541 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
|
2542 const char* false_action_str) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2543 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2544 if (cset_chooser->isEmpty()) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2545 ergo_verbose0(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2546 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2547 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
|
2548 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2549 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2550 size_t reclaimable_bytes = cset_chooser->remainingReclaimableBytes(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2551 size_t capacity_bytes = _g1->capacity(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2552 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
|
2553 double threshold = (double) G1HeapWastePercent; |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2554 if (perc < threshold) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2555 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2556 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2557 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
|
2558 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2559 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2560 ergo_format_perc("threshold"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2561 cset_chooser->remainingRegions(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2562 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2563 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2564 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2565 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2566 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2567 true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2568 ergo_format_reason("candidate old regions available") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2569 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2570 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2571 ergo_format_perc("threshold"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2572 cset_chooser->remainingRegions(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2573 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2574 return true; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2575 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2576 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2577 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
|
2578 // 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
|
2579 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
|
2580 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2581 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
|
2582 finalize_incremental_cset_building(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2583 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2584 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2585 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
|
2586 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2587 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2588 |
2589 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2590 double predicted_pause_time_ms = base_time_ms; | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2591 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2592 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2593 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2594 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2595 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
|
2596 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2597 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
|
2598 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
|
2599 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2600 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2601 double young_start_time_sec = os::elapsedTime(); |
342 | 2602 |
677 | 2603 _collection_set_bytes_used_before = 0; |
4710 | 2604 _last_gc_was_young = gcs_are_young() ? true : false; |
2605 | |
2606 if (_last_gc_was_young) { | |
2607 ++_young_pause_num; | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2608 } else { |
4710 | 2609 ++_mixed_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2610 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2611 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2612 // 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
|
2613 // 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
|
2614 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2615 |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2616 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
|
2617 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
parents:
4072
diff
changeset
|
2618 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
|
2619 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2620 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2621 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2622 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2623 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2624 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2625 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2626 // 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
|
2627 young_list->clear_survivors(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2628 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2629 _collection_set = _inc_cset_head; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2630 _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
|
2631 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2632 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
|
2633 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2634 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2635 "add young regions to CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2636 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2637 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2638 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
|
2639 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
|
2640 _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
|
2641 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2642 // The number of recorded young regions is the incremental |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2643 // collection set's current size |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2644 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2645 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2646 double young_end_time_sec = os::elapsedTime(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2647 _recorded_young_cset_choice_time_ms = |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
2648 (young_end_time_sec - young_start_time_sec) * 1000.0; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
2649 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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parents:
3830
diff
changeset
|
2650 // We are doing young collections so reset this. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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parents:
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diff
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|
2651 non_young_start_time_sec = young_end_time_sec; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2652 |
4710 | 2653 if (!gcs_are_young()) { |
4912
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7132029: G1: mixed GC phase lasts for longer than it should
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4837
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|
2654 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2655 assert(cset_chooser->verify(), "CSet Chooser verification - pre"); |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2656 const size_t min_old_cset_length = cset_chooser->calcMinOldCSetLength(); |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2657 const size_t max_old_cset_length = cset_chooser->calcMaxOldCSetLength(); |
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7132029: G1: mixed GC phase lasts for longer than it should
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changeset
|
2658 |
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7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
2659 size_t expensive_region_num = 0; |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2660 bool check_time_remaining = adaptive_young_list_length(); |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2661 HeapRegion* hr = cset_chooser->peek(); |
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7132029: G1: mixed GC phase lasts for longer than it should
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diff
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|
2662 while (hr != NULL) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
2663 if (old_cset_region_length() >= max_old_cset_length) { |
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|
2664 // Added maximum number of old regions to the CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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changeset
|
2665 ergo_verbose2(ErgoCSetConstruction, |
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7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
2666 "finish adding old regions to CSet", |
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parents:
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diff
changeset
|
2667 ergo_format_reason("old CSet region num reached max") |
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7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
2668 ergo_format_region("old") |
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7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
2669 ergo_format_region("max"), |
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7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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changeset
|
2670 old_cset_region_length(), max_old_cset_length); |
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7132029: G1: mixed GC phase lasts for longer than it should
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changeset
|
2671 break; |
342 | 2672 } |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3868
diff
changeset
|
2673 |
4912
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7132029: G1: mixed GC phase lasts for longer than it should
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changeset
|
2674 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2675 if (check_time_remaining) { |
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parents:
4837
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changeset
|
2676 if (predicted_time_ms > time_remaining_ms) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2677 // Too expensive for the current CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
changeset
|
2678 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
2679 if (old_cset_region_length() >= min_old_cset_length) { |
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parents:
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|
2680 // We have added the minimum number of old regions to the CSet, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2681 // we are done with this CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2682 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2683 "finish adding old regions to CSet", |
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parents:
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diff
changeset
|
2684 ergo_format_reason("predicted time is too high") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2685 ergo_format_ms("predicted time") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2686 ergo_format_ms("remaining time") |
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7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2687 ergo_format_region("old") |
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7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
changeset
|
2688 ergo_format_region("min"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
changeset
|
2689 predicted_time_ms, time_remaining_ms, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2690 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
|
2691 break; |
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7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
changeset
|
2692 } |
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7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
changeset
|
2693 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2694 // 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
|
2695 // minimum number of old regions. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
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diff
changeset
|
2696 expensive_region_num += 1; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
changeset
|
2697 } |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2698 } else { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2699 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
|
2700 // 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
|
2701 // 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
|
2702 ergo_verbose2(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2703 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2704 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
|
2705 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2706 ergo_format_region("min"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2707 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
|
2708 break; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2709 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2710 } |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2711 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2712 // 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
|
2713 time_remaining_ms -= predicted_time_ms; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2714 predicted_pause_time_ms += predicted_time_ms; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2715 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
|
2716 _g1->old_set_remove(hr); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2717 add_old_region_to_cset(hr); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2718 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2719 hr = cset_chooser->peek(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2720 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2721 if (hr == NULL) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2722 ergo_verbose0(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2723 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2724 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
|
2725 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2726 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2727 if (expensive_region_num > 0) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2728 // 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
|
2729 // 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
|
2730 // avoid generating output per region. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2731 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2732 "added expensive regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2733 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
|
2734 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2735 ergo_format_region("expensive") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2736 ergo_format_region("min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2737 ergo_format_ms("remaining time"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2738 old_cset_region_length(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2739 expensive_region_num, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2740 min_old_cset_length, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2741 time_remaining_ms); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2742 } |
a9647476d1a4
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tonyp
parents:
4837
diff
changeset
|
2743 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2744 assert(cset_chooser->verify(), "CSet Chooser verification - post"); |
342 | 2745 } |
2746 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2747 stop_incremental_cset_building(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2748 |
342 | 2749 count_CS_bytes_used(); |
2750 | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2751 ergo_verbose5(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2752 "finish choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2753 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2754 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2755 ergo_format_region("old") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2756 ergo_format_ms("predicted pause time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2757 ergo_format_ms("target pause time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2758 eden_region_length, survivor_region_length, |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2759 old_cset_region_length(), |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2760 predicted_pause_time_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2761 |
342 | 2762 double non_young_end_time_sec = os::elapsedTime(); |
2763 _recorded_non_young_cset_choice_time_ms = | |
2764 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2765 } |