Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 6010:720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
Summary: Change the type of fields / variables / etc. that represent region counts and indeces from size_t to uint.
Reviewed-by: iveresov, brutisso, jmasa, jwilhelm
author | tonyp |
---|---|
date | Wed, 18 Apr 2012 07:21:15 -0400 |
parents | 5c86f8211d1e |
children | f7a8920427a6 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 33 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
34 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
35 #include "runtime/arguments.hpp" | |
36 #include "runtime/java.hpp" | |
37 #include "runtime/mutexLocker.hpp" | |
38 #include "utilities/debug.hpp" | |
342 | 39 |
40 // Different defaults for different number of GC threads | |
41 // They were chosen by running GCOld and SPECjbb on debris with different | |
42 // numbers of GC threads and choosing them based on the results | |
43 | |
44 // all the same | |
45 static double rs_length_diff_defaults[] = { | |
46 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
47 }; | |
48 | |
49 static double cost_per_card_ms_defaults[] = { | |
50 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
51 }; | |
52 | |
53 // all the same | |
4710 | 54 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 55 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
56 }; | |
57 | |
58 static double cost_per_entry_ms_defaults[] = { | |
59 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
60 }; | |
61 | |
62 static double cost_per_byte_ms_defaults[] = { | |
63 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
64 }; | |
65 | |
66 // these should be pretty consistent | |
67 static double constant_other_time_ms_defaults[] = { | |
68 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
69 }; | |
70 | |
71 | |
72 static double young_other_cost_per_region_ms_defaults[] = { | |
73 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
74 }; | |
75 | |
76 static double non_young_other_cost_per_region_ms_defaults[] = { | |
77 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
78 }; | |
79 | |
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80 // Help class for avoiding interleaved logging |
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81 class LineBuffer: public StackObj { |
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82 |
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83 private: |
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84 static const int BUFFER_LEN = 1024; |
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85 static const int INDENT_CHARS = 3; |
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86 char _buffer[BUFFER_LEN]; |
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87 int _indent_level; |
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88 int _cur; |
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89 |
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90 void vappend(const char* format, va_list ap) { |
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91 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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92 if (res != -1) { |
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93 _cur += res; |
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94 } else { |
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95 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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96 _buffer[BUFFER_LEN -1] = 0; |
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97 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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98 } |
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99 } |
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100 |
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101 public: |
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102 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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103 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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104 _buffer[_cur] = ' '; |
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105 } |
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106 } |
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107 |
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108 #ifndef PRODUCT |
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109 ~LineBuffer() { |
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110 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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111 } |
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112 #endif |
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113 |
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114 void append(const char* format, ...) { |
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115 va_list ap; |
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116 va_start(ap, format); |
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117 vappend(format, ap); |
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118 va_end(ap); |
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119 } |
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120 |
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121 void append_and_print_cr(const char* format, ...) { |
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122 va_list ap; |
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123 va_start(ap, format); |
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124 vappend(format, ap); |
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125 va_end(ap); |
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126 gclog_or_tty->print_cr("%s", _buffer); |
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127 _cur = _indent_level * INDENT_CHARS; |
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128 } |
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129 }; |
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130 |
342 | 131 G1CollectorPolicy::G1CollectorPolicy() : |
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132 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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133 ? ParallelGCThreads : 1), |
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134 |
342 | 135 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
136 _all_pause_times_ms(new NumberSeq()), | |
137 _stop_world_start(0.0), | |
138 _all_stop_world_times_ms(new NumberSeq()), | |
139 _all_yield_times_ms(new NumberSeq()), | |
140 | |
677 | 141 _summary(new Summary()), |
342 | 142 |
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143 _cur_clear_ct_time_ms(0.0), |
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144 _root_region_scan_wait_time_ms(0.0), |
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145 |
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146 _cur_ref_proc_time_ms(0.0), |
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147 _cur_ref_enq_time_ms(0.0), |
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148 |
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149 #ifndef PRODUCT |
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150 _min_clear_cc_time_ms(-1.0), |
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151 _max_clear_cc_time_ms(-1.0), |
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152 _cur_clear_cc_time_ms(0.0), |
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153 _cum_clear_cc_time_ms(0.0), |
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154 _num_cc_clears(0L), |
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155 #endif |
342 | 156 |
157 _aux_num(10), | |
158 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
159 _cur_aux_start_times_ms(new double[_aux_num]), | |
160 _cur_aux_times_ms(new double[_aux_num]), | |
161 _cur_aux_times_set(new bool[_aux_num]), | |
162 | |
163 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
164 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
165 | |
166 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
167 _prev_collection_pause_end_ms(0.0), | |
168 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
169 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
170 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 171 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
172 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 173 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 174 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 175 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
176 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
177 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
178 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
179 _non_young_other_cost_per_region_ms_seq( | |
180 new TruncatedSeq(TruncatedSeqLength)), | |
181 | |
182 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
184 | |
751 | 185 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 186 |
4710 | 187 _gcs_are_young(true), |
188 _young_pause_num(0), | |
189 _mixed_pause_num(0), | |
342 | 190 |
191 _during_marking(false), | |
192 _in_marking_window(false), | |
193 _in_marking_window_im(false), | |
194 | |
195 _known_garbage_ratio(0.0), | |
196 _known_garbage_bytes(0), | |
197 | |
198 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
199 | |
4710 | 200 _recent_prev_end_times_for_all_gcs_sec( |
201 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 202 |
203 _recent_avg_pause_time_ratio(0.0), | |
204 | |
205 _all_full_gc_times_ms(new NumberSeq()), | |
206 | |
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207 _initiate_conc_mark_if_possible(false), |
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208 _during_initial_mark_pause(false), |
4710 | 209 _last_young_gc(false), |
210 _last_gc_was_young(false), | |
342 | 211 |
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212 _eden_bytes_before_gc(0), |
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213 _survivor_bytes_before_gc(0), |
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214 _capacity_before_gc(0), |
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215 |
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216 _eden_cset_region_length(0), |
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217 _survivor_cset_region_length(0), |
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218 _old_cset_region_length(0), |
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219 |
342 | 220 _collection_set(NULL), |
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221 _collection_set_bytes_used_before(0), |
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222 |
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223 // Incremental CSet attributes |
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224 _inc_cset_build_state(Inactive), |
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225 _inc_cset_head(NULL), |
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226 _inc_cset_tail(NULL), |
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227 _inc_cset_bytes_used_before(0), |
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228 _inc_cset_max_finger(NULL), |
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229 _inc_cset_recorded_rs_lengths(0), |
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230 _inc_cset_recorded_rs_lengths_diffs(0), |
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231 _inc_cset_predicted_elapsed_time_ms(0.0), |
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232 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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233 |
342 | 234 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
235 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
236 #endif // _MSC_VER | |
237 | |
238 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
239 G1YoungSurvRateNumRegionsSummary)), | |
240 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 241 G1YoungSurvRateNumRegionsSummary)), |
342 | 242 // add here any more surv rate groups |
545 | 243 _recorded_survivor_regions(0), |
244 _recorded_survivor_head(NULL), | |
245 _recorded_survivor_tail(NULL), | |
1356 | 246 _survivors_age_table(true), |
247 | |
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248 _gc_overhead_perc(0.0) { |
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249 |
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250 // Set up the region size and associated fields. Given that the |
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251 // policy is created before the heap, we have to set this up here, |
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252 // so it's done as soon as possible. |
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253 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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254 HeapRegionRemSet::setup_remset_size(); |
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255 |
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256 G1ErgoVerbose::initialize(); |
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257 if (PrintAdaptiveSizePolicy) { |
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258 // Currently, we only use a single switch for all the heuristics. |
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259 G1ErgoVerbose::set_enabled(true); |
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260 // Given that we don't currently have a verboseness level |
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261 // parameter, we'll hardcode this to high. This can be easily |
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262 // changed in the future. |
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263 G1ErgoVerbose::set_level(ErgoHigh); |
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264 } else { |
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265 G1ErgoVerbose::set_enabled(false); |
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266 } |
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267 |
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268 // Verify PLAB sizes |
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269 const size_t region_size = HeapRegion::GrainWords; |
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270 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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271 char buffer[128]; |
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272 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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273 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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274 vm_exit_during_initialization(buffer); |
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275 } |
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276 |
342 | 277 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
278 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
279 | |
1611 | 280 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 281 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
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282 _par_last_satb_filtering_times_ms = new double[_parallel_gc_threads]; |
342 | 283 |
284 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
285 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
286 | |
287 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
288 | |
289 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
290 | |
291 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 292 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
293 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 294 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
4023 | 295 _par_last_gc_worker_other_times_ms = new double[_parallel_gc_threads]; |
342 | 296 |
297 int index; | |
298 if (ParallelGCThreads == 0) | |
299 index = 0; | |
300 else if (ParallelGCThreads > 8) | |
301 index = 7; | |
302 else | |
303 index = ParallelGCThreads - 1; | |
304 | |
305 _pending_card_diff_seq->add(0.0); | |
306 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
307 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 308 _young_cards_per_entry_ratio_seq->add( |
309 young_cards_per_entry_ratio_defaults[index]); | |
342 | 310 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
311 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
312 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
313 _young_other_cost_per_region_ms_seq->add( | |
314 young_other_cost_per_region_ms_defaults[index]); | |
315 _non_young_other_cost_per_region_ms_seq->add( | |
316 non_young_other_cost_per_region_ms_defaults[index]); | |
317 | |
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318 // Below, we might need to calculate the pause time target based on |
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319 // the pause interval. When we do so we are going to give G1 maximum |
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320 // flexibility and allow it to do pauses when it needs to. So, we'll |
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321 // arrange that the pause interval to be pause time target + 1 to |
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322 // ensure that a) the pause time target is maximized with respect to |
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323 // the pause interval and b) we maintain the invariant that pause |
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324 // time target < pause interval. If the user does not want this |
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325 // maximum flexibility, they will have to set the pause interval |
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326 // explicitly. |
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327 |
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328 // First make sure that, if either parameter is set, its value is |
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329 // reasonable. |
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330 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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331 if (MaxGCPauseMillis < 1) { |
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332 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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333 "greater than 0"); |
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334 } |
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335 } |
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336 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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337 if (GCPauseIntervalMillis < 1) { |
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338 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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339 "greater than 0"); |
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340 } |
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341 } |
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342 |
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343 // Then, if the pause time target parameter was not set, set it to |
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344 // the default value. |
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345 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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346 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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347 // The default pause time target in G1 is 200ms |
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348 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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349 } else { |
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350 // We do not allow the pause interval to be set without the |
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351 // pause time target |
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352 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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353 "without setting MaxGCPauseMillis"); |
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354 } |
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355 } |
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356 |
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357 // Then, if the interval parameter was not set, set it according to |
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358 // the pause time target (this will also deal with the case when the |
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359 // pause time target is the default value). |
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360 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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361 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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362 } |
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363 |
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364 // Finally, make sure that the two parameters are consistent. |
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365 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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366 char buffer[256]; |
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367 jio_snprintf(buffer, 256, |
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368 "MaxGCPauseMillis (%u) should be less than " |
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369 "GCPauseIntervalMillis (%u)", |
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370 MaxGCPauseMillis, GCPauseIntervalMillis); |
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371 vm_exit_during_initialization(buffer); |
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372 } |
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373 |
751 | 374 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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375 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 376 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 377 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 378 |
379 // start conservatively (around 50ms is about right) | |
380 _concurrent_mark_remark_times_ms->add(0.05); | |
381 _concurrent_mark_cleanup_times_ms->add(0.20); | |
382 _tenuring_threshold = MaxTenuringThreshold; | |
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383 // _max_survivor_regions will be calculated by |
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384 // update_young_list_target_length() during initialization. |
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385 _max_survivor_regions = 0; |
545 | 386 |
1356 | 387 assert(GCTimeRatio > 0, |
388 "we should have set it to a default value set_g1_gc_flags() " | |
389 "if a user set it to 0"); | |
390 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
391 | |
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392 uintx reserve_perc = G1ReservePercent; |
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393 // Put an artificial ceiling on this so that it's not set to a silly value. |
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394 if (reserve_perc > 50) { |
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395 reserve_perc = 50; |
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396 warning("G1ReservePercent is set to a value that is too large, " |
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397 "it's been updated to %u", reserve_perc); |
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398 } |
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399 _reserve_factor = (double) reserve_perc / 100.0; |
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400 // This will be set when the heap is expanded |
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401 // for the first time during initialization. |
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402 _reserve_regions = 0; |
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403 |
342 | 404 initialize_all(); |
4013 | 405 _collectionSetChooser = new CollectionSetChooser(); |
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406 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 407 } |
408 | |
409 void G1CollectorPolicy::initialize_flags() { | |
410 set_min_alignment(HeapRegion::GrainBytes); | |
411 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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412 if (SurvivorRatio < 1) { |
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413 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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414 } |
342 | 415 CollectorPolicy::initialize_flags(); |
416 } | |
417 | |
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418 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
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419 assert(G1DefaultMinNewGenPercent <= G1DefaultMaxNewGenPercent, "Min larger than max"); |
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420 assert(G1DefaultMinNewGenPercent > 0 && G1DefaultMinNewGenPercent < 100, "Min out of bounds"); |
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421 assert(G1DefaultMaxNewGenPercent > 0 && G1DefaultMaxNewGenPercent < 100, "Max out of bounds"); |
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422 |
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423 if (FLAG_IS_CMDLINE(NewRatio)) { |
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424 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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425 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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426 } else { |
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427 _sizer_kind = SizerNewRatio; |
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428 _adaptive_size = false; |
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429 return; |
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430 } |
3976 | 431 } |
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432 |
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433 if (FLAG_IS_CMDLINE(NewSize)) { |
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434 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), |
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435 1U); |
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436 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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437 _max_desired_young_length = |
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438 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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439 1U); |
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440 _sizer_kind = SizerMaxAndNewSize; |
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441 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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442 } else { |
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443 _sizer_kind = SizerNewSizeOnly; |
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444 } |
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445 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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446 _max_desired_young_length = |
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447 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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448 1U); |
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449 _sizer_kind = SizerMaxNewSizeOnly; |
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450 } |
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451 } |
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452 |
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453 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { |
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454 uint default_value = (new_number_of_heap_regions * G1DefaultMinNewGenPercent) / 100; |
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455 return MAX2(1U, default_value); |
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456 } |
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457 |
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458 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { |
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459 uint default_value = (new_number_of_heap_regions * G1DefaultMaxNewGenPercent) / 100; |
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460 return MAX2(1U, default_value); |
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461 } |
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462 |
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463 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { |
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464 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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465 |
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466 switch (_sizer_kind) { |
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467 case SizerDefaults: |
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468 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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469 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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470 break; |
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471 case SizerNewSizeOnly: |
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472 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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473 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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474 break; |
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475 case SizerMaxNewSizeOnly: |
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476 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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477 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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478 break; |
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479 case SizerMaxAndNewSize: |
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480 // Do nothing. Values set on the command line, don't update them at runtime. |
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481 break; |
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482 case SizerNewRatio: |
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483 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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484 _max_desired_young_length = _min_desired_young_length; |
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485 break; |
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486 default: |
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487 ShouldNotReachHere(); |
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488 } |
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489 |
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490 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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491 } |
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492 |
342 | 493 void G1CollectorPolicy::init() { |
494 // Set aside an initial future to_space. | |
495 _g1 = G1CollectedHeap::heap(); | |
496 | |
497 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
498 | |
545 | 499 initialize_gc_policy_counters(); |
500 | |
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501 if (adaptive_young_list_length()) { |
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502 _young_list_fixed_length = 0; |
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503 } else { |
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504 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 505 } |
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506 _free_regions_at_end_of_collection = _g1->free_regions(); |
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507 update_young_list_target_length(); |
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508 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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509 |
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510 // We may immediately start allocating regions and placing them on the |
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511 // collection set list. Initialize the per-collection set info |
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512 start_incremental_cset_building(); |
342 | 513 } |
514 | |
545 | 515 // Create the jstat counters for the policy. |
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516 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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517 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 518 } |
519 | |
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520 bool G1CollectorPolicy::predict_will_fit(uint young_length, |
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521 double base_time_ms, |
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522 uint base_free_regions, |
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523 double target_pause_time_ms) { |
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524 if (young_length >= base_free_regions) { |
342 | 525 // end condition 1: not enough space for the young regions |
526 return false; | |
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527 } |
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528 |
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529 double accum_surv_rate = accum_yg_surv_rate_pred((int) young_length - 1); |
342 | 530 size_t bytes_to_copy = |
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531 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 532 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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533 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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534 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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535 if (pause_time_ms > target_pause_time_ms) { |
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536 // end condition 2: prediction is over the target pause time |
342 | 537 return false; |
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538 } |
342 | 539 |
540 size_t free_bytes = | |
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541 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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542 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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543 // end condition 3: out-of-space (conservatively!) |
342 | 544 return false; |
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545 } |
342 | 546 |
547 // success! | |
548 return true; | |
549 } | |
550 | |
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551 void G1CollectorPolicy::record_new_heap_size(uint new_number_of_regions) { |
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552 // re-calculate the necessary reserve |
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553 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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554 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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555 // smaller than 1.0) we'll get 1. |
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556 _reserve_regions = (uint) ceil(reserve_regions_d); |
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557 |
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558 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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559 } |
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560 |
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561 uint G1CollectorPolicy::calculate_young_list_desired_min_length( |
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562 uint base_min_length) { |
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563 uint desired_min_length = 0; |
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564 if (adaptive_young_list_length()) { |
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565 if (_alloc_rate_ms_seq->num() > 3) { |
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566 double now_sec = os::elapsedTime(); |
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567 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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568 double alloc_rate_ms = predict_alloc_rate_ms(); |
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569 desired_min_length = (uint) ceil(alloc_rate_ms * when_ms); |
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570 } else { |
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571 // otherwise we don't have enough info to make the prediction |
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572 } |
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573 } |
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574 desired_min_length += base_min_length; |
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575 // make sure we don't go below any user-defined minimum bound |
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576 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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577 } |
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578 |
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579 uint G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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580 // Here, we might want to also take into account any additional |
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581 // constraints (i.e., user-defined minimum bound). Currently, we |
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582 // effectively don't set this bound. |
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583 return _young_gen_sizer->max_desired_young_length(); |
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584 } |
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585 |
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586 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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587 if (rs_lengths == (size_t) -1) { |
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588 // if it's set to the default value (-1), we should predict it; |
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589 // otherwise, use the given value. |
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590 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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591 } |
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592 |
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593 // Calculate the absolute and desired min bounds. |
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594 |
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595 // This is how many young regions we already have (currently: the survivors). |
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596 uint base_min_length = recorded_survivor_regions(); |
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597 // This is the absolute minimum young length, which ensures that we |
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598 // can allocate one eden region in the worst-case. |
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599 uint absolute_min_length = base_min_length + 1; |
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600 uint desired_min_length = |
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601 calculate_young_list_desired_min_length(base_min_length); |
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602 if (desired_min_length < absolute_min_length) { |
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603 desired_min_length = absolute_min_length; |
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604 } |
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605 |
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606 // Calculate the absolute and desired max bounds. |
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607 |
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608 // We will try our best not to "eat" into the reserve. |
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609 uint absolute_max_length = 0; |
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610 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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611 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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612 } |
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613 uint desired_max_length = calculate_young_list_desired_max_length(); |
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614 if (desired_max_length > absolute_max_length) { |
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615 desired_max_length = absolute_max_length; |
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616 } |
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617 |
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618 uint young_list_target_length = 0; |
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619 if (adaptive_young_list_length()) { |
4710 | 620 if (gcs_are_young()) { |
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621 young_list_target_length = |
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622 calculate_young_list_target_length(rs_lengths, |
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623 base_min_length, |
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624 desired_min_length, |
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625 desired_max_length); |
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626 _rs_lengths_prediction = rs_lengths; |
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627 } else { |
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628 // Don't calculate anything and let the code below bound it to |
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629 // the desired_min_length, i.e., do the next GC as soon as |
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630 // possible to maximize how many old regions we can add to it. |
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631 } |
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632 } else { |
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633 // The user asked for a fixed young gen so we'll fix the young gen |
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634 // whether the next GC is young or mixed. |
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635 young_list_target_length = _young_list_fixed_length; |
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636 } |
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637 |
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638 // Make sure we don't go over the desired max length, nor under the |
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639 // desired min length. In case they clash, desired_min_length wins |
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640 // which is why that test is second. |
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641 if (young_list_target_length > desired_max_length) { |
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642 young_list_target_length = desired_max_length; |
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643 } |
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644 if (young_list_target_length < desired_min_length) { |
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645 young_list_target_length = desired_min_length; |
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646 } |
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647 |
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648 assert(young_list_target_length > recorded_survivor_regions(), |
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649 "we should be able to allocate at least one eden region"); |
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650 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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651 _young_list_target_length = young_list_target_length; |
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652 |
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653 update_max_gc_locker_expansion(); |
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654 } |
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655 |
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656 uint |
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657 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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658 uint base_min_length, |
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659 uint desired_min_length, |
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660 uint desired_max_length) { |
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661 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 662 assert(gcs_are_young(), "only call this for young GCs"); |
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663 |
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664 // In case some edge-condition makes the desired max length too small... |
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665 if (desired_max_length <= desired_min_length) { |
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666 return desired_min_length; |
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667 } |
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668 |
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669 // We'll adjust min_young_length and max_young_length not to include |
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670 // the already allocated young regions (i.e., so they reflect the |
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671 // min and max eden regions we'll allocate). The base_min_length |
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672 // will be reflected in the predictions by the |
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673 // survivor_regions_evac_time prediction. |
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674 assert(desired_min_length > base_min_length, "invariant"); |
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675 uint min_young_length = desired_min_length - base_min_length; |
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676 assert(desired_max_length > base_min_length, "invariant"); |
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677 uint max_young_length = desired_max_length - base_min_length; |
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678 |
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679 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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680 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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681 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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682 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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683 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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684 double base_time_ms = |
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685 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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686 survivor_regions_evac_time; |
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687 uint available_free_regions = _free_regions_at_end_of_collection; |
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688 uint base_free_regions = 0; |
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689 if (available_free_regions > _reserve_regions) { |
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690 base_free_regions = available_free_regions - _reserve_regions; |
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691 } |
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692 |
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693 // Here, we will make sure that the shortest young length that |
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694 // makes sense fits within the target pause time. |
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695 |
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696 if (predict_will_fit(min_young_length, base_time_ms, |
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697 base_free_regions, target_pause_time_ms)) { |
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698 // The shortest young length will fit into the target pause time; |
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699 // we'll now check whether the absolute maximum number of young |
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700 // regions will fit in the target pause time. If not, we'll do |
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701 // a binary search between min_young_length and max_young_length. |
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702 if (predict_will_fit(max_young_length, base_time_ms, |
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703 base_free_regions, target_pause_time_ms)) { |
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704 // The maximum young length will fit into the target pause time. |
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705 // We are done so set min young length to the maximum length (as |
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706 // the result is assumed to be returned in min_young_length). |
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707 min_young_length = max_young_length; |
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708 } else { |
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709 // The maximum possible number of young regions will not fit within |
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710 // the target pause time so we'll search for the optimal |
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711 // length. The loop invariants are: |
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712 // |
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713 // min_young_length < max_young_length |
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714 // min_young_length is known to fit into the target pause time |
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715 // max_young_length is known not to fit into the target pause time |
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716 // |
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717 // Going into the loop we know the above hold as we've just |
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718 // checked them. Every time around the loop we check whether |
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719 // the middle value between min_young_length and |
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720 // max_young_length fits into the target pause time. If it |
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721 // does, it becomes the new min. If it doesn't, it becomes |
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722 // the new max. This way we maintain the loop invariants. |
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723 |
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724 assert(min_young_length < max_young_length, "invariant"); |
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725 uint diff = (max_young_length - min_young_length) / 2; |
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726 while (diff > 0) { |
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727 uint young_length = min_young_length + diff; |
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728 if (predict_will_fit(young_length, base_time_ms, |
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729 base_free_regions, target_pause_time_ms)) { |
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730 min_young_length = young_length; |
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731 } else { |
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732 max_young_length = young_length; |
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733 } |
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734 assert(min_young_length < max_young_length, "invariant"); |
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735 diff = (max_young_length - min_young_length) / 2; |
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736 } |
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737 // The results is min_young_length which, according to the |
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738 // loop invariants, should fit within the target pause time. |
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739 |
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740 // These are the post-conditions of the binary search above: |
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741 assert(min_young_length < max_young_length, |
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742 "otherwise we should have discovered that max_young_length " |
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743 "fits into the pause target and not done the binary search"); |
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744 assert(predict_will_fit(min_young_length, base_time_ms, |
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745 base_free_regions, target_pause_time_ms), |
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746 "min_young_length, the result of the binary search, should " |
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747 "fit into the pause target"); |
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748 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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749 base_free_regions, target_pause_time_ms), |
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750 "min_young_length, the result of the binary search, should be " |
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751 "optimal, so no larger length should fit into the pause target"); |
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752 } |
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753 } else { |
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754 // Even the minimum length doesn't fit into the pause time |
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755 // target, return it as the result nevertheless. |
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756 } |
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757 return base_min_length + min_young_length; |
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758 } |
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759 |
545 | 760 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
761 double survivor_regions_evac_time = 0.0; | |
762 for (HeapRegion * r = _recorded_survivor_head; | |
763 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
764 r = r->get_next_young_region()) { | |
765 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
766 } | |
767 return survivor_regions_evac_time; | |
768 } | |
769 | |
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770 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 771 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
772 | |
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773 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 774 if (rs_lengths > _rs_lengths_prediction) { |
775 // add 10% to avoid having to recalculate often | |
776 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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777 update_young_list_target_length(rs_lengths_prediction); |
342 | 778 } |
779 } | |
780 | |
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781 |
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782 |
342 | 783 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
784 bool is_tlab, | |
785 bool* gc_overhead_limit_was_exceeded) { | |
786 guarantee(false, "Not using this policy feature yet."); | |
787 return NULL; | |
788 } | |
789 | |
790 // This method controls how a collector handles one or more | |
791 // of its generations being fully allocated. | |
792 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
793 bool is_tlab) { | |
794 guarantee(false, "Not using this policy feature yet."); | |
795 return NULL; | |
796 } | |
797 | |
798 | |
799 #ifndef PRODUCT | |
800 bool G1CollectorPolicy::verify_young_ages() { | |
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801 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 802 return |
803 verify_young_ages(head, _short_lived_surv_rate_group); | |
804 // also call verify_young_ages on any additional surv rate groups | |
805 } | |
806 | |
807 bool | |
808 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
809 SurvRateGroup *surv_rate_group) { | |
810 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
811 | |
812 const char* name = surv_rate_group->name(); | |
813 bool ret = true; | |
814 int prev_age = -1; | |
815 | |
816 for (HeapRegion* curr = head; | |
817 curr != NULL; | |
818 curr = curr->get_next_young_region()) { | |
819 SurvRateGroup* group = curr->surv_rate_group(); | |
820 if (group == NULL && !curr->is_survivor()) { | |
821 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
822 ret = false; | |
823 } | |
824 | |
825 if (surv_rate_group == group) { | |
826 int age = curr->age_in_surv_rate_group(); | |
827 | |
828 if (age < 0) { | |
829 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
830 ret = false; | |
831 } | |
832 | |
833 if (age <= prev_age) { | |
834 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
835 "(%d, %d)", name, age, prev_age); | |
836 ret = false; | |
837 } | |
838 prev_age = age; | |
839 } | |
840 } | |
841 | |
842 return ret; | |
843 } | |
844 #endif // PRODUCT | |
845 | |
846 void G1CollectorPolicy::record_full_collection_start() { | |
847 _cur_collection_start_sec = os::elapsedTime(); | |
848 // Release the future to-space so that it is available for compaction into. | |
849 _g1->set_full_collection(); | |
850 } | |
851 | |
852 void G1CollectorPolicy::record_full_collection_end() { | |
853 // Consider this like a collection pause for the purposes of allocation | |
854 // since last pause. | |
855 double end_sec = os::elapsedTime(); | |
856 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
857 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
858 | |
859 _all_full_gc_times_ms->add(full_gc_time_ms); | |
860 | |
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861 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 862 |
863 _g1->clear_full_collection(); | |
864 | |
4710 | 865 // "Nuke" the heuristics that control the young/mixed GC |
866 // transitions and make sure we start with young GCs after the Full GC. | |
867 set_gcs_are_young(true); | |
868 _last_young_gc = false; | |
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869 clear_initiate_conc_mark_if_possible(); |
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870 clear_during_initial_mark_pause(); |
342 | 871 _known_garbage_bytes = 0; |
872 _known_garbage_ratio = 0.0; | |
873 _in_marking_window = false; | |
874 _in_marking_window_im = false; | |
875 | |
876 _short_lived_surv_rate_group->start_adding_regions(); | |
877 // also call this on any additional surv rate groups | |
878 | |
545 | 879 record_survivor_regions(0, NULL, NULL); |
880 | |
342 | 881 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 882 // Reset survivors SurvRateGroup. |
883 _survivor_surv_rate_group->reset(); | |
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884 update_young_list_target_length(); |
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885 _collectionSetChooser->clearMarkedHeapRegions(); |
1973 | 886 } |
342 | 887 |
888 void G1CollectorPolicy::record_stop_world_start() { | |
889 _stop_world_start = os::elapsedTime(); | |
890 } | |
891 | |
892 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
893 size_t start_used) { | |
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894 if (G1Log::finer()) { |
342 | 895 gclog_or_tty->stamp(PrintGCTimeStamps); |
896 gclog_or_tty->print("[GC pause"); | |
4710 | 897 gclog_or_tty->print(" (%s)", gcs_are_young() ? "young" : "mixed"); |
342 | 898 } |
899 | |
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900 // We only need to do this here as the policy will only be applied |
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901 // to the GC we're about to start. so, no point is calculating this |
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902 // every time we calculate / recalculate the target young length. |
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903 update_survivors_policy(); |
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904 |
1973 | 905 assert(_g1->used() == _g1->recalculate_used(), |
906 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
907 _g1->used(), _g1->recalculate_used())); | |
342 | 908 |
909 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
910 _all_stop_world_times_ms->add(s_w_t_ms); | |
911 _stop_world_start = 0.0; | |
912 | |
913 _cur_collection_start_sec = start_time_sec; | |
914 _cur_collection_pause_used_at_start_bytes = start_used; | |
915 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
916 _pending_cards = _g1->pending_card_num(); | |
917 _max_pending_cards = _g1->max_pending_card_num(); | |
918 | |
919 _bytes_in_collection_set_before_gc = 0; | |
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920 _bytes_copied_during_gc = 0; |
342 | 921 |
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922 YoungList* young_list = _g1->young_list(); |
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923 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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924 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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925 _capacity_before_gc = _g1->capacity(); |
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926 |
342 | 927 #ifdef DEBUG |
928 // initialise these to something well known so that we can spot | |
929 // if they are not set properly | |
930 | |
931 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 932 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
933 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
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934 _par_last_satb_filtering_times_ms[i] = -1234.0; |
1611 | 935 _par_last_update_rs_times_ms[i] = -1234.0; |
936 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
937 _par_last_scan_rs_times_ms[i] = -1234.0; | |
938 _par_last_obj_copy_times_ms[i] = -1234.0; | |
939 _par_last_termination_times_ms[i] = -1234.0; | |
940 _par_last_termination_attempts[i] = -1234.0; | |
941 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 942 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 943 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 944 } |
945 #endif | |
946 | |
947 for (int i = 0; i < _aux_num; ++i) { | |
948 _cur_aux_times_ms[i] = 0.0; | |
949 _cur_aux_times_set[i] = false; | |
950 } | |
951 | |
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952 // This is initialized to zero here and is set during the evacuation |
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953 // pause if we actually waited for the root region scanning to finish. |
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954 _root_region_scan_wait_time_ms = 0.0; |
342 | 955 |
4710 | 956 _last_gc_was_young = false; |
342 | 957 |
958 // do that for any other surv rate groups | |
959 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 960 _survivors_age_table.clear(); |
545 | 961 |
342 | 962 assert( verify_young_ages(), "region age verification" ); |
963 } | |
964 | |
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965 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 966 mark_init_elapsed_time_ms) { |
967 _during_marking = true; | |
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968 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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969 clear_during_initial_mark_pause(); |
342 | 970 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
971 } | |
972 | |
973 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
974 _mark_remark_start_sec = os::elapsedTime(); | |
975 _during_marking = false; | |
976 } | |
977 | |
978 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
979 double end_time_sec = os::elapsedTime(); | |
980 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
981 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
982 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
983 _prev_collection_pause_end_ms += elapsed_time_ms; | |
984 | |
985 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
986 } | |
987 | |
988 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
989 _mark_cleanup_start_sec = os::elapsedTime(); | |
990 } | |
991 | |
4013 | 992 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 993 _last_young_gc = true; |
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994 _in_marking_window = false; |
342 | 995 } |
996 | |
997 void G1CollectorPolicy::record_concurrent_pause() { | |
998 if (_stop_world_start > 0.0) { | |
999 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1000 _all_yield_times_ms->add(yield_ms); | |
1001 } | |
1002 } | |
1003 | |
1004 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1005 } | |
1006 | |
1007 template<class T> | |
1008 T sum_of(T* sum_arr, int start, int n, int N) { | |
1009 T sum = (T)0; | |
1010 for (int i = 0; i < n; i++) { | |
1011 int j = (start + i) % N; | |
1012 sum += sum_arr[j]; | |
1013 } | |
1014 return sum; | |
1015 } | |
1016 | |
1611 | 1017 void G1CollectorPolicy::print_par_stats(int level, |
1018 const char* str, | |
2430 | 1019 double* data) { |
342 | 1020 double min = data[0], max = data[0]; |
1021 double total = 0.0; | |
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1022 LineBuffer buf(level); |
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1023 buf.append("[%s (ms):", str); |
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1024 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1025 double val = data[i]; |
1026 if (val < min) | |
1027 min = val; | |
1028 if (val > max) | |
1029 max = val; | |
1030 total += val; | |
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1031 if (G1Log::finest()) { |
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1032 buf.append(" %.1lf", val); |
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1033 } |
342 | 1034 } |
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1035 |
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1036 if (G1Log::finest()) { |
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1037 buf.append_and_print_cr(""); |
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1038 } |
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1039 double avg = total / (double) no_of_gc_threads(); |
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1040 buf.append_and_print_cr(" Avg: %.1lf Min: %.1lf Max: %.1lf Diff: %.1lf]", |
2430 | 1041 avg, min, max, max - min); |
342 | 1042 } |
1043 | |
1611 | 1044 void G1CollectorPolicy::print_par_sizes(int level, |
1045 const char* str, | |
2430 | 1046 double* data) { |
342 | 1047 double min = data[0], max = data[0]; |
1048 double total = 0.0; | |
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1049 LineBuffer buf(level); |
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1050 buf.append("[%s :", str); |
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1051 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1052 double val = data[i]; |
1053 if (val < min) | |
1054 min = val; | |
1055 if (val > max) | |
1056 max = val; | |
1057 total += val; | |
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1058 buf.append(" %d", (int) val); |
342 | 1059 } |
2430 | 1060 buf.append_and_print_cr(""); |
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1061 double avg = total / (double) no_of_gc_threads(); |
2430 | 1062 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", |
1063 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1064 } |
1065 | |
4023 | 1066 void G1CollectorPolicy::print_stats(int level, |
1067 const char* str, | |
1068 double value) { | |
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1069 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1070 } |
1071 | |
4023 | 1072 void G1CollectorPolicy::print_stats(int level, |
1073 const char* str, | |
1074 int value) { | |
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1075 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1076 } |
1077 | |
4023 | 1078 double G1CollectorPolicy::avg_value(double* data) { |
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1079 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1080 double ret = 0.0; |
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1081 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1082 ret += data[i]; |
4023 | 1083 } |
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1084 return ret / (double) no_of_gc_threads(); |
342 | 1085 } else { |
1086 return data[0]; | |
1087 } | |
1088 } | |
1089 | |
4023 | 1090 double G1CollectorPolicy::max_value(double* data) { |
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1091 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1092 double ret = data[0]; |
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1093 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
4023 | 1094 if (data[i] > ret) { |
342 | 1095 ret = data[i]; |
4023 | 1096 } |
1097 } | |
342 | 1098 return ret; |
1099 } else { | |
1100 return data[0]; | |
1101 } | |
1102 } | |
1103 | |
4023 | 1104 double G1CollectorPolicy::sum_of_values(double* data) { |
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1105 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1106 double sum = 0.0; |
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1107 for (uint i = 0; i < no_of_gc_threads(); i++) { |
342 | 1108 sum += data[i]; |
4023 | 1109 } |
342 | 1110 return sum; |
1111 } else { | |
1112 return data[0]; | |
1113 } | |
1114 } | |
1115 | |
4023 | 1116 double G1CollectorPolicy::max_sum(double* data1, double* data2) { |
342 | 1117 double ret = data1[0] + data2[0]; |
1118 | |
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1119 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1120 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
342 | 1121 double data = data1[i] + data2[i]; |
4023 | 1122 if (data > ret) { |
342 | 1123 ret = data; |
4023 | 1124 } |
342 | 1125 } |
1126 } | |
1127 return ret; | |
1128 } | |
1129 | |
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1130 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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|
1131 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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1132 return false; |
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|
1133 } |
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|
1134 |
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1135 size_t marking_initiating_used_threshold = |
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1136 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1137 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
4834
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7132311: G1: assert((s == klass->oop_size(this)) || (Universe::heap()->is_gc_active() && ((is_typeArray()...
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|
1138 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
6a78aa6ac1ff
7132311: G1: assert((s == klass->oop_size(this)) || (Universe::heap()->is_gc_active() && ((is_typeArray()...
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|
1139 |
6a78aa6ac1ff
7132311: G1: assert((s == klass->oop_size(this)) || (Universe::heap()->is_gc_active() && ((is_typeArray()...
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1140 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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|
1141 if (gcs_are_young()) { |
4834
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1142 ergo_verbose5(ErgoConcCycles, |
4829
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|
1143 "request concurrent cycle initiation", |
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1144 ergo_format_reason("occupancy higher than threshold") |
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|
1145 ergo_format_byte("occupancy") |
4834
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|
1146 ergo_format_byte("allocation request") |
4829
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|
1147 ergo_format_byte_perc("threshold") |
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6976060: G1: humongous object allocations should initiate marking cycles when necessary
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|
1148 ergo_format_str("source"), |
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6976060: G1: humongous object allocations should initiate marking cycles when necessary
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|
1149 cur_used_bytes, |
4834
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|
1150 alloc_byte_size, |
4829
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|
1151 marking_initiating_used_threshold, |
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|
1152 (double) InitiatingHeapOccupancyPercent, |
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|
1153 source); |
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|
1154 return true; |
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|
1155 } else { |
4834
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|
1156 ergo_verbose5(ErgoConcCycles, |
4829
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|
1157 "do not request concurrent cycle initiation", |
9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
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|
1158 ergo_format_reason("still doing mixed collections") |
9509c20bba28
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|
1159 ergo_format_byte("occupancy") |
4834
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|
1160 ergo_format_byte("allocation request") |
4829
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|
1161 ergo_format_byte_perc("threshold") |
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|
1162 ergo_format_str("source"), |
9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
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|
1163 cur_used_bytes, |
4834
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|
1164 alloc_byte_size, |
4829
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6976060: G1: humongous object allocations should initiate marking cycles when necessary
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|
1165 marking_initiating_used_threshold, |
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|
1166 (double) InitiatingHeapOccupancyPercent, |
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|
1167 source); |
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|
1168 } |
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|
1169 } |
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|
1170 |
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|
1171 return false; |
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|
1172 } |
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|
1173 |
342 | 1174 // Anything below that is considered to be zero |
1175 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1176 | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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|
1177 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1178 double end_time_sec = os::elapsedTime(); |
1179 double elapsed_ms = _last_pause_time_ms; | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1779
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|
1180 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
1181 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
1182 "otherwise, the subtraction below does not make sense"); |
342 | 1183 size_t rs_size = |
4090
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|
1184 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1185 size_t cur_used_bytes = _g1->used(); |
1186 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1187 bool last_pause_included_initial_mark = false; | |
1707 | 1188 bool update_stats = !_g1->evacuation_failed(); |
4095
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|
1189 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1190 |
1191 #ifndef PRODUCT | |
1192 if (G1YoungSurvRateVerbose) { | |
1193 gclog_or_tty->print_cr(""); | |
1194 _short_lived_surv_rate_group->print(); | |
1195 // do that for any other surv rate groups too | |
1196 } | |
1197 #endif // PRODUCT | |
1198 | |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
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|
1199 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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|
1200 if (last_pause_included_initial_mark) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
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|
1201 record_concurrent_mark_init_end(0.0); |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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4837
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|
1202 } else if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
4829
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|
1203 // Note: this might have already been set, if during the last |
9509c20bba28
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1204 // pause we decided to start a cycle but at the beginning of |
9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
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|
1205 // this pause we decided to postpone it. That's OK. |
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|
1206 set_initiate_conc_mark_if_possible(); |
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|
1207 } |
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|
1208 |
342 | 1209 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1210 end_time_sec, false); | |
1211 | |
1212 // This assert is exempted when we're doing parallel collection pauses, | |
1213 // because the fragmentation caused by the parallel GC allocation buffers | |
1214 // can lead to more memory being used during collection than was used | |
1215 // before. Best leave this out until the fragmentation problem is fixed. | |
1216 // Pauses in which evacuation failed can also lead to negative | |
1217 // collections, since no space is reclaimed from a region containing an | |
1218 // object whose evacuation failed. | |
1219 // Further, we're now always doing parallel collection. But I'm still | |
1220 // leaving this here as a placeholder for a more precise assertion later. | |
1221 // (DLD, 10/05.) | |
1222 assert((true || parallel) // Always using GC LABs now. | |
1223 || _g1->evacuation_failed() | |
1224 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1225 "Negative collection"); | |
1226 | |
1227 size_t freed_bytes = | |
1228 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1229 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1230 |
342 | 1231 double survival_fraction = |
1232 (double)surviving_bytes/ | |
1233 (double)_collection_set_bytes_used_before; | |
1234 | |
4023 | 1235 // These values are used to update the summary information that is |
1236 // displayed when TraceGen0Time is enabled, and are output as part | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
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5988
diff
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|
1237 // of the "finer" output, in the non-parallel case. |
4023 | 1238 |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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|
1239 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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|
1240 double satb_filtering_time = avg_value(_par_last_satb_filtering_times_ms); |
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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|
1241 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
14a2fd14c0db
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|
1242 double update_rs_processed_buffers = |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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|
1243 sum_of_values(_par_last_update_rs_processed_buffers); |
14a2fd14c0db
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|
1244 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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|
1245 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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|
1246 double termination_time = avg_value(_par_last_termination_times_ms); |
14a2fd14c0db
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|
1247 |
4023 | 1248 double known_time = ext_root_scan_time + |
4787
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|
1249 satb_filtering_time + |
4023 | 1250 update_rs_time + |
1251 scan_rs_time + | |
1252 obj_copy_time; | |
1253 | |
1254 double other_time_ms = elapsed_ms; | |
1255 | |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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4834
diff
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|
1256 // Subtract the root region scanning wait time. It's initialized to |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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diff
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|
1257 // zero at the start of the pause. |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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|
1258 other_time_ms -= _root_region_scan_wait_time_ms; |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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|
1259 |
4023 | 1260 if (parallel) { |
1261 other_time_ms -= _cur_collection_par_time_ms; | |
1262 } else { | |
1263 other_time_ms -= known_time; | |
1264 } | |
1265 | |
5986
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
johnc
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5964
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|
1266 // Now subtract the time taken to fix up roots in generated code |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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5964
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|
1267 other_time_ms -= _cur_collection_code_root_fixup_time_ms; |
500023bd0818
7143511: G1: Another instance of high GC Worker Other time (50ms)
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|
1268 |
4023 | 1269 // Subtract the time taken to clean the card table from the |
1270 // current value of "other time" | |
1271 other_time_ms -= _cur_clear_ct_time_ms; | |
1272 | |
1273 // TraceGen0Time and TraceGen1Time summary info updating. | |
1274 _all_pause_times_ms->add(elapsed_ms); | |
3823
14a2fd14c0db
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|
1275 |
595
3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
tonyp
parents:
547
diff
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|
1276 if (update_stats) { |
4023 | 1277 _summary->record_total_time_ms(elapsed_ms); |
1278 _summary->record_other_time_ms(other_time_ms); | |
1279 | |
1280 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1281 assert(body_summary != NULL, "should not be null!"); | |
1282 | |
4837
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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4834
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|
1283 body_summary->record_root_region_scan_wait_time_ms( |
eff609af17d7
7127706: G1: re-enable survivors during the initial-mark pause
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4834
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|
1284 _root_region_scan_wait_time_ms); |
3823
14a2fd14c0db
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3778
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|
1285 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4729
diff
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|
1286 body_summary->record_satb_filtering_time_ms(satb_filtering_time); |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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3778
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|
1287 body_summary->record_update_rs_time_ms(update_rs_time); |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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|
1288 body_summary->record_scan_rs_time_ms(scan_rs_time); |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
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3778
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|
1289 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1290 |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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3778
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|
1291 if (parallel) { |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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parents:
3778
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changeset
|
1292 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
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3778
diff
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|
1293 body_summary->record_termination_time_ms(termination_time); |
4023 | 1294 |
1295 double parallel_known_time = known_time + termination_time; | |
1296 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
3823
14a2fd14c0db
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johnc
parents:
3778
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|
1297 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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|
1298 } |
4023 | 1299 |
1300 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
3823
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johnc
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3778
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|
1301 |
342 | 1302 // We exempt parallel collection from this check because Alloc Buffer |
1303 // fragmentation can produce negative collections. Same with evac | |
1304 // failure. | |
1305 // Further, we're now always doing parallel collection. But I'm still | |
1306 // leaving this here as a placeholder for a more precise assertion later. | |
1307 // (DLD, 10/05. | |
1308 assert((true || parallel) | |
1309 || _g1->evacuation_failed() | |
1310 || surviving_bytes <= _collection_set_bytes_used_before, | |
1311 "Or else negative collection!"); | |
4023 | 1312 |
342 | 1313 // this is where we update the allocation rate of the application |
1314 double app_time_ms = | |
1315 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1316 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1317 // This usually happens due to the timer not having the required | |
1318 // granularity. Some Linuxes are the usual culprits. | |
1319 // We'll just set it to something (arbitrarily) small. | |
1320 app_time_ms = 1.0; | |
1321 } | |
4090
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1322 // We maintain the invariant that all objects allocated by mutator |
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1323 // threads will be allocated out of eden regions. So, we can use |
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1324 // the eden region number allocated since the previous GC to |
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1325 // calculate the application's allocate rate. The only exception |
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1326 // to that is humongous objects that are allocated separately. But |
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1327 // given that humongous object allocations do not really affect |
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1328 // either the pause's duration nor when the next pause will take |
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1329 // place we can safely ignore them here. |
6010
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1330 uint regions_allocated = eden_cset_region_length(); |
342 | 1331 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
1332 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1333 | |
1334 double interval_ms = | |
1335 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1336 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1337 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1338 if (recent_avg_pause_time_ratio() < 0.0 || |
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1339 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1340 #ifndef PRODUCT |
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1341 // Dump info to allow post-facto debugging |
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1342 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1343 gclog_or_tty->print_cr("-------------------------------------------"); |
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1344 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1345 _recent_gc_times_ms->dump(); |
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1346 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1347 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1348 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1349 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1350 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1351 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1352 #endif // !PRODUCT |
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1353 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1354 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1355 if (_recent_avg_pause_time_ratio < 0.0) { |
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1356 _recent_avg_pause_time_ratio = 0.0; |
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1357 } else { |
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1358 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1359 _recent_avg_pause_time_ratio = 1.0; |
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1360 } |
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1361 } |
342 | 1362 } |
1363 | |
4023 | 1364 for (int i = 0; i < _aux_num; ++i) { |
1365 if (_cur_aux_times_set[i]) { | |
1366 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1367 } | |
1368 } | |
1369 | |
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1370 if (G1Log::finer()) { |
4023 | 1371 bool print_marking_info = |
1372 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1373 | |
1707 | 1374 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1375 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1376 elapsed_ms / 1000.0); | |
1377 | |
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1378 if (_root_region_scan_wait_time_ms > 0.0) { |
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1379 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms); |
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1380 } |
1707 | 1381 if (parallel) { |
1382 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1383 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1384 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1385 if (print_marking_info) { | |
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1386 print_par_stats(2, "SATB Filtering", _par_last_satb_filtering_times_ms); |
4023 | 1387 } |
1707 | 1388 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
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1389 if (G1Log::finest()) { |
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1390 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
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1391 } |
1707 | 1392 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1393 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1394 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
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1395 if (G1Log::finest()) { |
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1396 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
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1397 } |
2430 | 1398 |
1399 for (int i = 0; i < _parallel_gc_threads; i++) { | |
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1400 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - |
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1401 _par_last_gc_worker_start_times_ms[i]; |
4023 | 1402 |
1403 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
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1404 _par_last_satb_filtering_times_ms[i] + |
4023 | 1405 _par_last_update_rs_times_ms[i] + |
1406 _par_last_scan_rs_times_ms[i] + | |
1407 _par_last_obj_copy_times_ms[i] + | |
1408 _par_last_termination_times_ms[i]; | |
1409 | |
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1410 _par_last_gc_worker_other_times_ms[i] = _par_last_gc_worker_times_ms[i] - |
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1411 worker_known_time; |
2430 | 1412 } |
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1413 |
4023 | 1414 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); |
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1415 print_par_stats(2, "GC Worker Total", _par_last_gc_worker_times_ms); |
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1416 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
1707 | 1417 } else { |
4023 | 1418 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1419 if (print_marking_info) { | |
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1420 print_stats(1, "SATB Filtering", satb_filtering_time); |
4023 | 1421 } |
1707 | 1422 print_stats(1, "Update RS", update_rs_time); |
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1423 if (G1Log::finest()) { |
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1424 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
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1425 } |
1707 | 1426 print_stats(1, "Scan RS", scan_rs_time); |
1427 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1428 } |
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1429 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms); |
4023 | 1430 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
890
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1431 #ifndef PRODUCT |
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1432 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1433 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1434 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1435 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1436 if (_num_cc_clears > 0) { |
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1437 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1438 } |
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1439 #endif |
342 | 1440 print_stats(1, "Other", other_time_ms); |
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1441 print_stats(2, "Choose CSet", |
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1442 (_recorded_young_cset_choice_time_ms + |
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1443 _recorded_non_young_cset_choice_time_ms)); |
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1444 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1445 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1446 print_stats(2, "Free CSet", |
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1447 (_recorded_young_free_cset_time_ms + |
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1448 _recorded_non_young_free_cset_time_ms)); |
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1449 |
342 | 1450 for (int i = 0; i < _aux_num; ++i) { |
1451 if (_cur_aux_times_set[i]) { | |
1452 char buffer[96]; | |
1453 sprintf(buffer, "Aux%d", i); | |
1454 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1455 } | |
1456 } | |
1457 } | |
1458 | |
1459 // Update the efficiency-since-mark vars. | |
1460 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1461 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1462 // This usually happens due to the timer not having the required | |
1463 // granularity. Some Linuxes are the usual culprits. | |
1464 // We'll just set it to something (arbitrarily) small. | |
1465 proc_ms = 1.0; | |
1466 } | |
1467 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1468 | |
1469 bool new_in_marking_window = _in_marking_window; | |
1470 bool new_in_marking_window_im = false; | |
1359
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1471 if (during_initial_mark_pause()) { |
342 | 1472 new_in_marking_window = true; |
1473 new_in_marking_window_im = true; | |
1474 } | |
1475 | |
4710 | 1476 if (_last_young_gc) { |
4912
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1477 // This is supposed to to be the "last young GC" before we start |
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1478 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1479 |
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1480 if (!last_pause_included_initial_mark) { |
4912
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1481 if (next_gc_should_be_mixed("start mixed GCs", |
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1482 "do not start mixed GCs")) { |
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1483 set_gcs_are_young(false); |
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1484 } |
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1485 } else { |
4710 | 1486 ergo_verbose0(ErgoMixedGCs, |
1487 "do not start mixed GCs", | |
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1488 ergo_format_reason("concurrent cycle is about to start")); |
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1489 } |
4710 | 1490 _last_young_gc = false; |
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1491 } |
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1492 |
4710 | 1493 if (!_last_gc_was_young) { |
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1494 // This is a mixed GC. Here we decide whether to continue doing |
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1495 // mixed GCs or not. |
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1496 |
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1497 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1498 "do not continue mixed GCs")) { |
4710 | 1499 set_gcs_are_young(true); |
342 | 1500 } |
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1501 } |
4710 | 1502 |
1503 if (_last_gc_was_young && !_during_marking) { | |
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1504 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1505 } |
1506 | |
1507 _short_lived_surv_rate_group->start_adding_regions(); | |
1508 // do that for any other surv rate groupsx | |
1509 | |
677 | 1510 if (update_stats) { |
342 | 1511 double pause_time_ms = elapsed_ms; |
1512 | |
1513 size_t diff = 0; | |
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1514 if (_max_pending_cards >= _pending_cards) { |
342 | 1515 diff = _max_pending_cards - _pending_cards; |
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1516 } |
342 | 1517 _pending_card_diff_seq->add((double) diff); |
1518 | |
1519 double cost_per_card_ms = 0.0; | |
1520 if (_pending_cards > 0) { | |
1521 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1522 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1523 } | |
1524 | |
1525 size_t cards_scanned = _g1->cards_scanned(); | |
1526 | |
1527 double cost_per_entry_ms = 0.0; | |
1528 if (cards_scanned > 10) { | |
1529 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
4710 | 1530 if (_last_gc_was_young) { |
342 | 1531 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1532 } else { |
1533 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1534 } | |
342 | 1535 } |
1536 | |
1537 if (_max_rs_lengths > 0) { | |
1538 double cards_per_entry_ratio = | |
1539 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1540 if (_last_gc_was_young) { |
1541 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1542 } else { | |
1543 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1544 } | |
342 | 1545 } |
1546 | |
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1547 // This is defensive. For a while _max_rs_lengths could get |
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1548 // smaller than _recorded_rs_lengths which was causing |
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1549 // rs_length_diff to get very large and mess up the RSet length |
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1550 // predictions. The reason was unsafe concurrent updates to the |
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1551 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1552 // against (see CR 7118202). This bug has now been fixed (see CR |
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1553 // 7119027). However, I'm still worried that |
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1554 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1555 // inaccurate. The concurrent refinement thread calculates an |
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1556 // RSet's length concurrently with other CR threads updating it |
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1557 // which might cause it to calculate the length incorrectly (if, |
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1558 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1559 // conditional below just in case. |
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1560 size_t rs_length_diff = 0; |
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1561 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1562 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1563 } |
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1564 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1565 |
1566 size_t copied_bytes = surviving_bytes; | |
1567 double cost_per_byte_ms = 0.0; | |
1568 if (copied_bytes > 0) { | |
1569 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
4710 | 1570 if (_in_marking_window) { |
342 | 1571 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1572 } else { |
342 | 1573 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1574 } |
342 | 1575 } |
1576 | |
1577 double all_other_time_ms = pause_time_ms - | |
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1578 (update_rs_time + scan_rs_time + obj_copy_time + termination_time); |
342 | 1579 |
1580 double young_other_time_ms = 0.0; | |
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1581 if (young_cset_region_length() > 0) { |
342 | 1582 young_other_time_ms = |
1583 _recorded_young_cset_choice_time_ms + | |
1584 _recorded_young_free_cset_time_ms; | |
1585 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1586 (double) young_cset_region_length()); |
342 | 1587 } |
1588 double non_young_other_time_ms = 0.0; | |
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1589 if (old_cset_region_length() > 0) { |
342 | 1590 non_young_other_time_ms = |
1591 _recorded_non_young_cset_choice_time_ms + | |
1592 _recorded_non_young_free_cset_time_ms; | |
1593 | |
1594 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1595 (double) old_cset_region_length()); |
342 | 1596 } |
1597 | |
1598 double constant_other_time_ms = all_other_time_ms - | |
1599 (young_other_time_ms + non_young_other_time_ms); | |
1600 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1601 | |
1602 double survival_ratio = 0.0; | |
1603 if (_bytes_in_collection_set_before_gc > 0) { | |
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1604 survival_ratio = (double) _bytes_copied_during_gc / |
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1605 (double) _bytes_in_collection_set_before_gc; |
342 | 1606 } |
1607 | |
1608 _pending_cards_seq->add((double) _pending_cards); | |
1609 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1610 } | |
1611 | |
1612 _in_marking_window = new_in_marking_window; | |
1613 _in_marking_window_im = new_in_marking_window_im; | |
1614 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1615 update_young_list_target_length(); |
342 | 1616 |
1111 | 1617 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1618 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1619 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1620 |
1621 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1622 } |
1623 | |
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1624 #define EXT_SIZE_FORMAT "%d%s" |
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1625 #define EXT_SIZE_PARAMS(bytes) \ |
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1626 byte_size_in_proper_unit((bytes)), \ |
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1627 proper_unit_for_byte_size((bytes)) |
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1628 |
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1629 void G1CollectorPolicy::print_heap_transition() { |
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1630 if (G1Log::finer()) { |
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1631 YoungList* young_list = _g1->young_list(); |
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1632 size_t eden_bytes = young_list->eden_used_bytes(); |
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1633 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1634 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1635 size_t used = _g1->used(); |
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1636 size_t capacity = _g1->capacity(); |
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1637 size_t eden_capacity = |
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1638 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1639 |
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1640 gclog_or_tty->print_cr( |
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1641 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1642 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1643 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1644 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1645 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1646 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1647 EXT_SIZE_PARAMS(eden_bytes), |
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1648 EXT_SIZE_PARAMS(eden_capacity), |
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1649 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1650 EXT_SIZE_PARAMS(survivor_bytes), |
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1651 EXT_SIZE_PARAMS(used_before_gc), |
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1652 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1653 EXT_SIZE_PARAMS(used), |
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1654 EXT_SIZE_PARAMS(capacity)); |
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1655 |
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1656 _prev_eden_capacity = eden_capacity; |
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1657 } else if (G1Log::fine()) { |
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1658 _g1->print_size_transition(gclog_or_tty, |
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1659 _cur_collection_pause_used_at_start_bytes, |
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1660 _g1->used(), _g1->capacity()); |
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1661 } |
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1662 } |
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1663 |
1111 | 1664 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1665 double update_rs_processed_buffers, | |
1666 double goal_ms) { | |
1667 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1668 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1669 | |
1282 | 1670 if (G1UseAdaptiveConcRefinement) { |
1111 | 1671 const int k_gy = 3, k_gr = 6; |
1672 const double inc_k = 1.1, dec_k = 0.9; | |
1673 | |
1674 int g = cg1r->green_zone(); | |
1675 if (update_rs_time > goal_ms) { | |
1676 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1677 } else { | |
1678 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1679 g = (int)MAX2(g * inc_k, g + 1.0); | |
1680 } | |
1681 } | |
1682 // Change the refinement threads params | |
1683 cg1r->set_green_zone(g); | |
1684 cg1r->set_yellow_zone(g * k_gy); | |
1685 cg1r->set_red_zone(g * k_gr); | |
1686 cg1r->reinitialize_threads(); | |
1687 | |
1688 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1689 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1690 cg1r->yellow_zone()); | |
1691 // Change the barrier params | |
1692 dcqs.set_process_completed_threshold(processing_threshold); | |
1693 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1694 } | |
1695 | |
1696 int curr_queue_size = dcqs.completed_buffers_num(); | |
1697 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1698 dcqs.set_completed_queue_padding(curr_queue_size); | |
1699 } else { | |
1700 dcqs.set_completed_queue_padding(0); | |
1701 } | |
1702 dcqs.notify_if_necessary(); | |
1703 } | |
1704 | |
342 | 1705 double |
1706 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1707 size_t rs_length = predict_rs_length_diff(); | |
1708 size_t card_num; | |
4710 | 1709 if (gcs_are_young()) { |
342 | 1710 card_num = predict_young_card_num(rs_length); |
4710 | 1711 } else { |
342 | 1712 card_num = predict_non_young_card_num(rs_length); |
4710 | 1713 } |
342 | 1714 return predict_base_elapsed_time_ms(pending_cards, card_num); |
1715 } | |
1716 | |
1717 double | |
1718 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1719 size_t scanned_cards) { | |
1720 return | |
1721 predict_rs_update_time_ms(pending_cards) + | |
1722 predict_rs_scan_time_ms(scanned_cards) + | |
1723 predict_constant_other_time_ms(); | |
1724 } | |
1725 | |
1726 double | |
1727 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1728 bool young) { | |
1729 size_t rs_length = hr->rem_set()->occupied(); | |
1730 size_t card_num; | |
4710 | 1731 if (gcs_are_young()) { |
342 | 1732 card_num = predict_young_card_num(rs_length); |
4710 | 1733 } else { |
342 | 1734 card_num = predict_non_young_card_num(rs_length); |
4710 | 1735 } |
342 | 1736 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1737 | |
1738 double region_elapsed_time_ms = | |
1739 predict_rs_scan_time_ms(card_num) + | |
1740 predict_object_copy_time_ms(bytes_to_copy); | |
1741 | |
1742 if (young) | |
1743 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1744 else | |
1745 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1746 | |
1747 return region_elapsed_time_ms; | |
1748 } | |
1749 | |
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1750 size_t G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
342 | 1751 size_t bytes_to_copy; |
1752 if (hr->is_marked()) | |
1753 bytes_to_copy = hr->max_live_bytes(); | |
1754 else { | |
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1755 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1756 int age = hr->age_in_surv_rate_group(); |
545 | 1757 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1758 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1759 } | |
1760 return bytes_to_copy; | |
1761 } | |
1762 | |
1763 void | |
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1764 G1CollectorPolicy::init_cset_region_lengths(uint eden_cset_region_length, |
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1765 uint survivor_cset_region_length) { |
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1766 _eden_cset_region_length = eden_cset_region_length; |
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1767 _survivor_cset_region_length = survivor_cset_region_length; |
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1768 _old_cset_region_length = 0; |
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1769 } |
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1770 |
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1771 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1772 _recorded_rs_lengths = rs_lengths; |
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1773 } |
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1774 |
342 | 1775 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1776 double elapsed_ms) { | |
1777 _recent_gc_times_ms->add(elapsed_ms); | |
1778 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1779 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1780 } | |
1781 | |
1782 size_t G1CollectorPolicy::expansion_amount() { | |
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1783 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1784 double threshold = _gc_overhead_perc; |
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1785 if (recent_gc_overhead > threshold) { |
751 | 1786 // We will double the existing space, or take |
1787 // G1ExpandByPercentOfAvailable % of the available expansion | |
1788 // space, whichever is smaller, bounded below by a minimum | |
1789 // expansion (unless that's all that's left.) | |
342 | 1790 const size_t min_expand_bytes = 1*M; |
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1791 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1792 size_t committed_bytes = _g1->capacity(); |
1793 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1794 size_t expand_bytes; | |
1795 size_t expand_bytes_via_pct = | |
751 | 1796 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1797 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1798 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1799 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1800 |
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1801 ergo_verbose5(ErgoHeapSizing, |
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1802 "attempt heap expansion", |
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1803 ergo_format_reason("recent GC overhead higher than " |
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1804 "threshold after GC") |
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1805 ergo_format_perc("recent GC overhead") |
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1806 ergo_format_perc("threshold") |
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1807 ergo_format_byte("uncommitted") |
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1808 ergo_format_byte_perc("calculated expansion amount"), |
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1809 recent_gc_overhead, threshold, |
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1810 uncommitted_bytes, |
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1811 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1812 |
342 | 1813 return expand_bytes; |
1814 } else { | |
1815 return 0; | |
1816 } | |
1817 } | |
1818 | |
1819 class CountCSClosure: public HeapRegionClosure { | |
1820 G1CollectorPolicy* _g1_policy; | |
1821 public: | |
1822 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1823 _g1_policy(g1_policy) {} | |
1824 bool doHeapRegion(HeapRegion* r) { | |
1825 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1826 return false; | |
1827 } | |
1828 }; | |
1829 | |
1830 void G1CollectorPolicy::count_CS_bytes_used() { | |
1831 CountCSClosure cs_closure(this); | |
1832 _g1->collection_set_iterate(&cs_closure); | |
1833 } | |
1834 | |
4023 | 1835 void G1CollectorPolicy::print_summary(int level, |
1836 const char* str, | |
1837 NumberSeq* seq) const { | |
342 | 1838 double sum = seq->sum(); |
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1839 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1840 str, sum / 1000.0, seq->avg()); |
1841 } | |
1842 | |
4023 | 1843 void G1CollectorPolicy::print_summary_sd(int level, |
1844 const char* str, | |
1845 NumberSeq* seq) const { | |
342 | 1846 print_summary(level, str, seq); |
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1847 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1848 seq->num(), seq->sd(), seq->maximum()); |
1849 } | |
1850 | |
1851 void G1CollectorPolicy::check_other_times(int level, | |
1852 NumberSeq* other_times_ms, | |
1853 NumberSeq* calc_other_times_ms) const { | |
1854 bool should_print = false; | |
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1855 LineBuffer buf(level + 2); |
342 | 1856 |
1857 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1858 fabs(calc_other_times_ms->sum())); | |
1859 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1860 fabs(calc_other_times_ms->sum())); | |
1861 double sum_ratio = max_sum / min_sum; | |
1862 if (sum_ratio > 1.1) { | |
1863 should_print = true; | |
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1864 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1865 } |
1866 | |
1867 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1868 fabs(calc_other_times_ms->avg())); | |
1869 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1870 fabs(calc_other_times_ms->avg())); | |
1871 double avg_ratio = max_avg / min_avg; | |
1872 if (avg_ratio > 1.1) { | |
1873 should_print = true; | |
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1874 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1875 } |
1876 | |
1877 if (other_times_ms->sum() < -0.01) { | |
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1878 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1879 } |
1880 | |
1881 if (other_times_ms->avg() < -0.01) { | |
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1882 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1883 } |
1884 | |
1885 if (calc_other_times_ms->sum() < -0.01) { | |
1886 should_print = true; | |
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1887 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1888 } |
1889 | |
1890 if (calc_other_times_ms->avg() < -0.01) { | |
1891 should_print = true; | |
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1892 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1893 } |
1894 | |
1895 if (should_print) | |
1896 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1897 } | |
1898 | |
1899 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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1900 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1901 MainBodySummary* body_summary = summary->main_body_summary(); |
1902 if (summary->get_total_seq()->num() > 0) { | |
677 | 1903 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1904 if (body_summary != NULL) { |
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1905 print_summary(1, "Root Region Scan Wait", body_summary->get_root_region_scan_wait_seq()); |
342 | 1906 if (parallel) { |
1907 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 1908 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1909 print_summary(2, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1910 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
1911 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
1912 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
1913 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 1914 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 1915 { |
1916 NumberSeq* other_parts[] = { | |
1917 body_summary->get_ext_root_scan_seq(), | |
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1918 body_summary->get_satb_filtering_seq(), |
4023 | 1919 body_summary->get_update_rs_seq(), |
342 | 1920 body_summary->get_scan_rs_seq(), |
1921 body_summary->get_obj_copy_seq(), | |
1922 body_summary->get_termination_seq() | |
1923 }; | |
1924 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 1925 6, other_parts); |
342 | 1926 check_other_times(2, body_summary->get_parallel_other_seq(), |
1927 &calc_other_times_ms); | |
1928 } | |
1929 } else { | |
4023 | 1930 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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1931 print_summary(1, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 1932 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
1933 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
1934 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
1935 } | |
1936 } | |
4023 | 1937 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); |
342 | 1938 print_summary(1, "Other", summary->get_other_seq()); |
1939 { | |
1779 | 1940 if (body_summary != NULL) { |
1941 NumberSeq calc_other_times_ms; | |
1942 if (parallel) { | |
1943 // parallel | |
1944 NumberSeq* other_parts[] = { | |
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1945 body_summary->get_root_region_scan_wait_seq(), |
1779 | 1946 body_summary->get_parallel_seq(), |
1947 body_summary->get_clear_ct_seq() | |
1948 }; | |
1949 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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1950 3, other_parts); |
1779 | 1951 } else { |
1952 // serial | |
1953 NumberSeq* other_parts[] = { | |
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1954 body_summary->get_root_region_scan_wait_seq(), |
1779 | 1955 body_summary->get_update_rs_seq(), |
1956 body_summary->get_ext_root_scan_seq(), | |
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1957 body_summary->get_satb_filtering_seq(), |
1779 | 1958 body_summary->get_scan_rs_seq(), |
1959 body_summary->get_obj_copy_seq() | |
1960 }; | |
1961 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
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1962 6, other_parts); |
1779 | 1963 } |
1964 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 1965 } |
1966 } | |
1967 } else { | |
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1968 LineBuffer(1).append_and_print_cr("none"); |
342 | 1969 } |
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1970 LineBuffer(0).append_and_print_cr(""); |
342 | 1971 } |
1972 | |
1973 void G1CollectorPolicy::print_tracing_info() const { | |
1974 if (TraceGen0Time) { | |
1975 gclog_or_tty->print_cr("ALL PAUSES"); | |
1976 print_summary_sd(0, "Total", _all_pause_times_ms); | |
1977 gclog_or_tty->print_cr(""); | |
1978 gclog_or_tty->print_cr(""); | |
4710 | 1979 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
1980 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); | |
342 | 1981 gclog_or_tty->print_cr(""); |
1982 | |
677 | 1983 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
1984 print_summary(_summary); | |
342 | 1985 |
1986 gclog_or_tty->print_cr("MISC"); | |
1987 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
1988 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
1989 for (int i = 0; i < _aux_num; ++i) { | |
1990 if (_all_aux_times_ms[i].num() > 0) { | |
1991 char buffer[96]; | |
1992 sprintf(buffer, "Aux%d", i); | |
1993 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
1994 } | |
1995 } | |
1996 } | |
1997 if (TraceGen1Time) { | |
1998 if (_all_full_gc_times_ms->num() > 0) { | |
1999 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2000 _all_full_gc_times_ms->num(), | |
2001 _all_full_gc_times_ms->sum() / 1000.0); | |
2002 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2003 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2004 _all_full_gc_times_ms->sd(), | |
2005 _all_full_gc_times_ms->maximum()); | |
2006 } | |
2007 } | |
2008 } | |
2009 | |
2010 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2011 #ifndef PRODUCT | |
2012 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2013 // add this call for any other surv rate groups | |
2014 #endif // PRODUCT | |
2015 } | |
2016 | |
2017 #ifndef PRODUCT | |
2018 // for debugging, bit of a hack... | |
2019 static char* | |
2020 region_num_to_mbs(int length) { | |
2021 static char buffer[64]; | |
2022 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2023 double mbs = bytes / (double) (1024 * 1024); | |
2024 sprintf(buffer, "%7.2lfMB", mbs); | |
2025 return buffer; | |
2026 } | |
2027 #endif // PRODUCT | |
2028 | |
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2029 uint G1CollectorPolicy::max_regions(int purpose) { |
342 | 2030 switch (purpose) { |
2031 case GCAllocForSurvived: | |
545 | 2032 return _max_survivor_regions; |
342 | 2033 case GCAllocForTenured: |
545 | 2034 return REGIONS_UNLIMITED; |
342 | 2035 default: |
545 | 2036 ShouldNotReachHere(); |
2037 return REGIONS_UNLIMITED; | |
342 | 2038 }; |
2039 } | |
2040 | |
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2041 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
6010
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2042 uint expansion_region_num = 0; |
1991
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2043 if (GCLockerEdenExpansionPercent > 0) { |
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2044 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2045 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2046 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2047 // less than 1.0) we'll get 1. |
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2048 expansion_region_num = (uint) ceil(expansion_region_num_d); |
1991
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2049 } else { |
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2050 assert(expansion_region_num == 0, "sanity"); |
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2051 } |
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2052 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2053 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2054 } |
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2055 |
545 | 2056 // Calculates survivor space parameters. |
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2057 void G1CollectorPolicy::update_survivors_policy() { |
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2058 double max_survivor_regions_d = |
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2059 (double) _young_list_target_length / (double) SurvivorRatio; |
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2060 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2061 // smaller than 1.0) we'll get 1. |
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2062 _max_survivor_regions = (uint) ceil(max_survivor_regions_d); |
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2063 |
3868
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2064 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2065 HeapRegion::GrainWords * _max_survivor_regions); |
2066 } | |
2067 | |
342 | 2068 #ifndef PRODUCT |
2069 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2070 CollectionSetChooser* _chooser; | |
2071 public: | |
2072 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2073 _chooser(chooser) {} | |
2074 | |
2075 bool doHeapRegion(HeapRegion* r) { | |
2076 if (!r->continuesHumongous()) { | |
2077 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2078 } | |
2079 return false; | |
2080 } | |
2081 }; | |
2082 | |
4013 | 2083 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2084 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2085 _g1->heap_region_iterate(&cl); | |
2086 return true; | |
2087 } | |
2088 #endif | |
2089 | |
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2090 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2091 GCCause::Cause gc_cause) { |
1656
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2092 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2093 if (!during_cycle) { |
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2094 ergo_verbose1(ErgoConcCycles, |
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2095 "request concurrent cycle initiation", |
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2096 ergo_format_reason("requested by GC cause") |
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2097 ergo_format_str("GC cause"), |
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2098 GCCause::to_string(gc_cause)); |
1656
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2099 set_initiate_conc_mark_if_possible(); |
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2100 return true; |
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2101 } else { |
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2102 ergo_verbose1(ErgoConcCycles, |
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2103 "do not request concurrent cycle initiation", |
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2104 ergo_format_reason("concurrent cycle already in progress") |
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2105 ergo_format_str("GC cause"), |
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2106 GCCause::to_string(gc_cause)); |
1656
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|
2107 return false; |
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|
2108 } |
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|
2109 } |
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2110 |
342 | 2111 void |
1359
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2112 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2113 // We are about to decide on whether this pause will be an |
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2114 // initial-mark pause. |
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2115 |
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2116 // First, during_initial_mark_pause() should not be already set. We |
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2117 // will set it here if we have to. However, it should be cleared by |
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2118 // the end of the pause (it's only set for the duration of an |
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2119 // initial-mark pause). |
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2120 assert(!during_initial_mark_pause(), "pre-condition"); |
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2121 |
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2122 if (initiate_conc_mark_if_possible()) { |
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2123 // We had noticed on a previous pause that the heap occupancy has |
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2124 // gone over the initiating threshold and we should start a |
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2125 // concurrent marking cycle. So we might initiate one. |
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2126 |
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|
2127 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2128 if (!during_cycle) { |
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2129 // The concurrent marking thread is not "during a cycle", i.e., |
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2130 // it has completed the last one. So we can go ahead and |
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2131 // initiate a new cycle. |
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2132 |
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|
2133 set_during_initial_mark_pause(); |
4710 | 2134 // We do not allow mixed GCs during marking. |
2135 if (!gcs_are_young()) { | |
2136 set_gcs_are_young(true); | |
2137 ergo_verbose0(ErgoMixedGCs, | |
2138 "end mixed GCs", | |
3982
273b46400613
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|
2139 ergo_format_reason("concurrent cycle is about to start")); |
273b46400613
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|
2140 } |
1359
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|
2141 |
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|
2142 // And we can now clear initiate_conc_mark_if_possible() as |
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|
2143 // we've already acted on it. |
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|
2144 clear_initiate_conc_mark_if_possible(); |
3914
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|
2145 |
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|
2146 ergo_verbose0(ErgoConcCycles, |
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|
2147 "initiate concurrent cycle", |
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|
2148 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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2149 } else { |
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2150 // The concurrent marking thread is still finishing up the |
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2151 // previous cycle. If we start one right now the two cycles |
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2152 // overlap. In particular, the concurrent marking thread might |
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2153 // be in the process of clearing the next marking bitmap (which |
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2154 // we will use for the next cycle if we start one). Starting a |
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2155 // cycle now will be bad given that parts of the marking |
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2156 // information might get cleared by the marking thread. And we |
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2157 // cannot wait for the marking thread to finish the cycle as it |
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2158 // periodically yields while clearing the next marking bitmap |
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2159 // and, if it's in a yield point, it's waiting for us to |
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2160 // finish. So, at this point we will not start a cycle and we'll |
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2161 // let the concurrent marking thread complete the last one. |
3914
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2162 ergo_verbose0(ErgoConcCycles, |
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2163 "do not initiate concurrent cycle", |
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|
2164 ergo_format_reason("concurrent cycle already in progress")); |
1359
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2165 } |
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2166 } |
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2167 } |
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2168 |
342 | 2169 class KnownGarbageClosure: public HeapRegionClosure { |
4912
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2170 G1CollectedHeap* _g1h; |
342 | 2171 CollectionSetChooser* _hrSorted; |
2172 | |
2173 public: | |
2174 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
4912
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2175 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 2176 |
2177 bool doHeapRegion(HeapRegion* r) { | |
2178 // We only include humongous regions in collection | |
2179 // sets when concurrent mark shows that their contained object is | |
2180 // unreachable. | |
2181 | |
2182 // Do we have any marking information for this region? | |
2183 if (r->is_marked()) { | |
4912
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2184 // We will skip any region that's currently used as an old GC |
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2185 // alloc region (we should not consider those for collection |
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2186 // before we fill them up). |
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2187 if (_hrSorted->shouldAdd(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 2188 _hrSorted->addMarkedHeapRegion(r); |
2189 } | |
2190 } | |
2191 return false; | |
2192 } | |
2193 }; | |
2194 | |
2195 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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2196 G1CollectedHeap* _g1h; |
342 | 2197 CollectionSetChooser* _hrSorted; |
2198 jint _marked_regions_added; | |
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2199 size_t _reclaimable_bytes_added; |
342 | 2200 jint _chunk_size; |
2201 jint _cur_chunk_idx; | |
2202 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2203 int _worker; | |
2204 int _invokes; | |
2205 | |
2206 void get_new_chunk() { | |
2207 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2208 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2209 } | |
2210 void add_region(HeapRegion* r) { | |
2211 if (_cur_chunk_idx == _cur_chunk_end) { | |
2212 get_new_chunk(); | |
2213 } | |
2214 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2215 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2216 _marked_regions_added++; | |
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2217 _reclaimable_bytes_added += r->reclaimable_bytes(); |
342 | 2218 _cur_chunk_idx++; |
2219 } | |
2220 | |
2221 public: | |
2222 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2223 jint chunk_size, | |
2224 int worker) : | |
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2225 _g1h(G1CollectedHeap::heap()), |
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2226 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), |
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2227 _marked_regions_added(0), _reclaimable_bytes_added(0), |
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2228 _cur_chunk_idx(0), _cur_chunk_end(0), _invokes(0) { } |
342 | 2229 |
2230 bool doHeapRegion(HeapRegion* r) { | |
2231 // We only include humongous regions in collection | |
2232 // sets when concurrent mark shows that their contained object is | |
2233 // unreachable. | |
2234 _invokes++; | |
2235 | |
2236 // Do we have any marking information for this region? | |
2237 if (r->is_marked()) { | |
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2238 // We will skip any region that's currently used as an old GC |
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2239 // alloc region (we should not consider those for collection |
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2240 // before we fill them up). |
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2241 if (_hrSorted->shouldAdd(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 2242 add_region(r); |
2243 } | |
2244 } | |
2245 return false; | |
2246 } | |
2247 jint marked_regions_added() { return _marked_regions_added; } | |
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2248 size_t reclaimable_bytes_added() { return _reclaimable_bytes_added; } |
342 | 2249 int invokes() { return _invokes; } |
2250 }; | |
2251 | |
2252 class ParKnownGarbageTask: public AbstractGangTask { | |
2253 CollectionSetChooser* _hrSorted; | |
2254 jint _chunk_size; | |
2255 G1CollectedHeap* _g1; | |
2256 public: | |
2257 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2258 AbstractGangTask("ParKnownGarbageTask"), | |
2259 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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2260 _g1(G1CollectedHeap::heap()) { } |
342 | 2261 |
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2262 void work(uint worker_id) { |
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2263 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, |
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2264 _chunk_size, |
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2265 worker_id); |
342 | 2266 // Back to zero for the claim value. |
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2267 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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2268 _g1->workers()->active_workers(), |
355 | 2269 HeapRegion::InitialClaimValue); |
342 | 2270 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
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2271 size_t reclaimable_bytes_added = |
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2272 parKnownGarbageCl.reclaimable_bytes_added(); |
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2273 _hrSorted->updateTotals(regions_added, reclaimable_bytes_added); |
342 | 2274 if (G1PrintParCleanupStats) { |
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2275 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
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2276 worker_id, parKnownGarbageCl.invokes(), regions_added); |
342 | 2277 } |
2278 } | |
2279 }; | |
2280 | |
2281 void | |
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2282 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
4013 | 2283 double start_sec; |
2284 if (G1PrintParCleanupStats) { | |
2285 start_sec = os::elapsedTime(); | |
2286 } | |
342 | 2287 |
2288 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2289 double clear_marked_end_sec; |
342 | 2290 if (G1PrintParCleanupStats) { |
4013 | 2291 clear_marked_end_sec = os::elapsedTime(); |
2292 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2293 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2294 } |
4013 | 2295 |
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2296 uint region_num = _g1->n_regions(); |
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2297 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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2298 const uint OverpartitionFactor = 4; |
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2299 uint WorkUnit; |
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2300 // The use of MinChunkSize = 8 in the original code |
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2301 // causes some assertion failures when the total number of |
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2302 // region is less than 8. The code here tries to fix that. |
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2303 // Should the original code also be fixed? |
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2304 if (no_of_gc_threads > 0) { |
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2305 const uint MinWorkUnit = MAX2(region_num / no_of_gc_threads, 1U); |
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2306 WorkUnit = MAX2(region_num / (no_of_gc_threads * OverpartitionFactor), |
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2307 MinWorkUnit); |
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2308 } else { |
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2309 assert(no_of_gc_threads > 0, |
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2310 "The active gc workers should be greater than 0"); |
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2311 // In a product build do something reasonable to avoid a crash. |
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2312 const uint MinWorkUnit = MAX2(region_num / (uint) ParallelGCThreads, 1U); |
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2313 WorkUnit = |
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2314 MAX2(region_num / (uint) (ParallelGCThreads * OverpartitionFactor), |
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2315 MinWorkUnit); |
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2316 } |
342 | 2317 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2318 WorkUnit); |
342 | 2319 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2320 (int) WorkUnit); |
342 | 2321 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2322 |
2323 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2324 "sanity check"); | |
342 | 2325 } else { |
2326 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2327 _g1->heap_region_iterate(&knownGarbagecl); | |
2328 } | |
4013 | 2329 double known_garbage_end_sec; |
342 | 2330 if (G1PrintParCleanupStats) { |
4013 | 2331 known_garbage_end_sec = os::elapsedTime(); |
342 | 2332 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2333 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2334 } |
4013 | 2335 |
342 | 2336 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2337 double end_sec = os::elapsedTime(); |
342 | 2338 if (G1PrintParCleanupStats) { |
2339 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2340 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2341 } |
2342 | |
4013 | 2343 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2344 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2345 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2346 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2347 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2348 } |
2349 | |
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2350 // Add the heap region at the head of the non-incremental collection set |
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2351 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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2352 assert(_inc_cset_build_state == Active, "Precondition"); |
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2353 assert(!hr->is_young(), "non-incremental add of young region"); |
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2354 |
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2355 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2356 hr->set_in_collection_set(true); |
2357 hr->set_next_in_collection_set(_collection_set); | |
2358 _collection_set = hr; | |
2359 _collection_set_bytes_used_before += hr->used(); | |
526 | 2360 _g1->register_region_with_in_cset_fast_test(hr); |
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2361 size_t rs_length = hr->rem_set()->occupied(); |
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2362 _recorded_rs_lengths += rs_length; |
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2363 _old_cset_region_length += 1; |
342 | 2364 } |
2365 | |
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2366 // Initialize the per-collection-set information |
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2367 void G1CollectorPolicy::start_incremental_cset_building() { |
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2368 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2369 |
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2370 _inc_cset_head = NULL; |
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2371 _inc_cset_tail = NULL; |
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2372 _inc_cset_bytes_used_before = 0; |
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2373 |
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2374 _inc_cset_max_finger = 0; |
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2375 _inc_cset_recorded_rs_lengths = 0; |
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2376 _inc_cset_recorded_rs_lengths_diffs = 0; |
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2377 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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2378 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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2379 _inc_cset_build_state = Active; |
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2380 } |
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2381 |
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2382 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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2383 assert(_inc_cset_build_state == Active, "Precondition"); |
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2384 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2385 |
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2386 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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2387 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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2388 // that adds a new region to the CSet. Further updates by the |
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2389 // concurrent refinement thread that samples the young RSet lengths |
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2390 // are accumulated in the *_diffs fields. Here we add the diffs to |
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2391 // the "main" fields. |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2392 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2393 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2394 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2395 } else { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
changeset
|
2396 // This is defensive. The diff should in theory be always positive |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2397 // as RSets can only grow between GCs. However, given that we |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
changeset
|
2398 // sample their size concurrently with other threads updating them |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2399 // it's possible that we might get the wrong size back, which |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2400 // could make the calculations somewhat inaccurate. |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
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|
2401 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
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|
2402 if (_inc_cset_recorded_rs_lengths >= diffs) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
changeset
|
2403 _inc_cset_recorded_rs_lengths -= diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2404 } else { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
changeset
|
2405 _inc_cset_recorded_rs_lengths = 0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2406 } |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
changeset
|
2407 } |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
changeset
|
2408 _inc_cset_predicted_elapsed_time_ms += |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2409 _inc_cset_predicted_elapsed_time_ms_diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
changeset
|
2410 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
changeset
|
2411 _inc_cset_recorded_rs_lengths_diffs = 0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2412 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
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|
2413 } |
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|
2414 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2415 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2416 // This routine is used when: |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2417 // * adding survivor regions to the incremental cset at the end of an |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2418 // evacuation pause, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2419 // * adding the current allocation region to the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2420 // when it is retired, and |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2421 // * updating existing policy information for a region in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2422 // incremental cset via young list RSet sampling. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2423 // 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
|
2424 // 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
|
2425 // 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
|
2426 // refine thread (RSet sampling). |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2427 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2428 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
|
2429 size_t used_bytes = hr->used(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2430 _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
|
2431 _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
|
2432 _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
|
2433 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2434 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2435 // 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
|
2436 // 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
|
2437 // rset sampling code |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2438 hr->set_recorded_rs_length(rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2439 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2440 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2441 |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2442 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
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|
2443 size_t new_rs_length) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2444 // 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
|
2445 assert(hr->is_young(), "Precondition"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2446 assert(!SafepointSynchronize::is_at_safepoint(), |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2447 "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
|
2448 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
changeset
|
2449 // 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
|
2450 // _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
|
2451 // 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
|
2452 // 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
|
2453 // 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
|
2454 // 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
|
2455 // 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
|
2456 // 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
|
2457 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2458 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
|
2459 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
|
2460 _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
|
2461 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2462 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
|
2463 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
|
2464 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
|
2465 _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
|
2466 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2467 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
|
2468 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
|
2469 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2470 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2471 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
|
2472 assert(hr->is_young(), "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2473 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
|
2474 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
|
2475 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2476 // 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
|
2477 // 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
|
2478 // 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
|
2479 // 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
|
2480 // 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
|
2481 // 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
|
2482 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2483 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
|
2484 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
|
2485 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2486 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
|
2487 _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
|
2488 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2489 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
|
2490 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
|
2491 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
|
2492 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2493 _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
|
2494 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2495 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2496 // 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
|
2497 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
|
2498 // 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
|
2499 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
|
2500 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2501 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2502 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
|
2503 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2504 // 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
|
2505 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
|
2506 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
|
2507 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2508 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2509 _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
|
2510 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2511 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2512 } |
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 // 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
|
2515 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
|
2516 // 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
|
2517 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
|
2518 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2519 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2520 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
|
2521 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2522 // 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
|
2523 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
|
2524 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
|
2525 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
|
2526 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2527 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2528 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2529 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2530 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2531 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2532 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
|
2533 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
|
2534 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2535 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
|
2536 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2537 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2538 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
|
2539 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
|
2540 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
|
2541 "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
|
2542 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2543 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2544 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
|
2545 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
|
2546 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
|
2547 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
|
2548 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2549 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2550 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2551 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2552 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2553 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2554 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2555 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
|
2556 const char* false_action_str) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2557 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2558 if (cset_chooser->isEmpty()) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2559 ergo_verbose0(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2560 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2561 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
|
2562 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2563 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2564 size_t reclaimable_bytes = cset_chooser->remainingReclaimableBytes(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2565 size_t capacity_bytes = _g1->capacity(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2566 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
|
2567 double threshold = (double) G1HeapWastePercent; |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2568 if (perc < threshold) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2569 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2570 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2571 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
|
2572 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2573 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2574 ergo_format_perc("threshold"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2575 cset_chooser->remainingRegions(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2576 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2577 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2578 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2579 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2580 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2581 true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2582 ergo_format_reason("candidate old regions available") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2583 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2584 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2585 ergo_format_perc("threshold"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2586 cset_chooser->remainingRegions(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2587 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2588 return true; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2589 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2590 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2591 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
|
2592 // 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
|
2593 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
|
2594 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2595 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
|
2596 finalize_incremental_cset_building(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2597 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2598 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2599 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
|
2600 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2601 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2602 |
2603 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2604 double predicted_pause_time_ms = base_time_ms; | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2605 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2606 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2607 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2608 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2609 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
|
2610 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2611 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
|
2612 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
|
2613 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2614 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2615 double young_start_time_sec = os::elapsedTime(); |
342 | 2616 |
677 | 2617 _collection_set_bytes_used_before = 0; |
4710 | 2618 _last_gc_was_young = gcs_are_young() ? true : false; |
2619 | |
2620 if (_last_gc_was_young) { | |
2621 ++_young_pause_num; | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2622 } else { |
4710 | 2623 ++_mixed_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2624 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2625 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2626 // 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
|
2627 // 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
|
2628 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2629 |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2630 uint survivor_region_length = young_list->survivor_length(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2631 uint eden_region_length = young_list->length() - survivor_region_length; |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2632 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
|
2633 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2634 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2635 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2636 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2637 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2638 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2639 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2640 // 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
|
2641 young_list->clear_survivors(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2642 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2643 _collection_set = _inc_cset_head; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2644 _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
|
2645 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2646 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
|
2647 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2648 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2649 "add young regions to CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2650 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2651 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2652 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
|
2653 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
|
2654 _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
|
2655 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2656 // The number of recorded young regions is the incremental |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2657 // collection set's current size |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2658 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2659 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2660 double young_end_time_sec = os::elapsedTime(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2661 _recorded_young_cset_choice_time_ms = |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2662 (young_end_time_sec - young_start_time_sec) * 1000.0; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2663 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2664 // We are doing young collections so reset this. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2665 non_young_start_time_sec = young_end_time_sec; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2666 |
4710 | 2667 if (!gcs_are_young()) { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2668 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
2669 assert(cset_chooser->verify(), "CSet Chooser verification - pre"); |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2670 const uint min_old_cset_length = cset_chooser->calcMinOldCSetLength(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2671 const uint max_old_cset_length = cset_chooser->calcMaxOldCSetLength(); |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2672 |
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6007
diff
changeset
|
2673 uint expensive_region_num = 0; |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2674 bool check_time_remaining = adaptive_young_list_length(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2675 HeapRegion* hr = cset_chooser->peek(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2676 while (hr != NULL) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2677 if (old_cset_region_length() >= max_old_cset_length) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2678 // Added maximum number of old regions to the CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2679 ergo_verbose2(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2680 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2681 ergo_format_reason("old CSet region num reached max") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2682 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2683 ergo_format_region("max"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2684 old_cset_region_length(), max_old_cset_length); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2685 break; |
342 | 2686 } |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2687 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2688 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2689 if (check_time_remaining) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2690 if (predicted_time_ms > time_remaining_ms) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2691 // Too expensive for the current CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2692 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2693 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
|
2694 // We have added the minimum number of old regions to the CSet, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2695 // we are done with this CSet. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2696 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2697 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2698 ergo_format_reason("predicted time is too high") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2699 ergo_format_ms("predicted time") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2700 ergo_format_ms("remaining time") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2701 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2702 ergo_format_region("min"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2703 predicted_time_ms, time_remaining_ms, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2704 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
|
2705 break; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2706 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2707 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2708 // 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
|
2709 // minimum number of old regions. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2710 expensive_region_num += 1; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2711 } |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2712 } else { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2713 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
|
2714 // 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
|
2715 // 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
|
2716 ergo_verbose2(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2717 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2718 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
|
2719 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2720 ergo_format_region("min"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2721 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
|
2722 break; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2723 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2724 } |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2725 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2726 // 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
|
2727 time_remaining_ms -= predicted_time_ms; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2728 predicted_pause_time_ms += predicted_time_ms; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2729 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
|
2730 _g1->old_set_remove(hr); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2731 add_old_region_to_cset(hr); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2732 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2733 hr = cset_chooser->peek(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2734 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2735 if (hr == NULL) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2736 ergo_verbose0(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2737 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2738 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
|
2739 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2740 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2741 if (expensive_region_num > 0) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2742 // 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
|
2743 // 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
|
2744 // avoid generating output per region. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2745 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2746 "added expensive regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2747 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
|
2748 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2749 ergo_format_region("expensive") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2750 ergo_format_region("min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2751 ergo_format_ms("remaining time"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2752 old_cset_region_length(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2753 expensive_region_num, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2754 min_old_cset_length, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2755 time_remaining_ms); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2756 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2757 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2758 assert(cset_chooser->verify(), "CSet Chooser verification - post"); |
342 | 2759 } |
2760 | |
1394
1316cec51b4d
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2761 stop_incremental_cset_building(); |
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2762 |
342 | 2763 count_CS_bytes_used(); |
2764 | |
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2765 ergo_verbose5(ErgoCSetConstruction, |
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2766 "finish choosing CSet", |
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2767 ergo_format_region("eden") |
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2768 ergo_format_region("survivors") |
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2769 ergo_format_region("old") |
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2770 ergo_format_ms("predicted pause time") |
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2771 ergo_format_ms("target pause time"), |
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2772 eden_region_length, survivor_region_length, |
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2773 old_cset_region_length(), |
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2774 predicted_pause_time_ms, target_pause_time_ms); |
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2775 |
342 | 2776 double non_young_end_time_sec = os::elapsedTime(); |
2777 _recorded_non_young_cset_choice_time_ms = | |
2778 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2779 } |