Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 4781:bacb651cf5bf
7113006: G1: excessive ergo output when an evac failure happens
Summary: Introduce a flag that is set when a heap expansion attempt during a GC fails so that we do not consantly attempt to expand the heap when it's going to fail anyway. This not only prevents the excessive ergo output (which is generated when a region allocation fails) but also avoids excessive and ultimately unsuccessful expansion attempts.
Reviewed-by: jmasa, johnc
author | tonyp |
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date | Thu, 05 Jan 2012 05:54:01 -0500 |
parents | 1cbe7978b021 |
children | 2ace1c4ee8da |
rev | line source |
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342 | 1 /* |
2152 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 32 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
33 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
34 #include "runtime/arguments.hpp" | |
35 #include "runtime/java.hpp" | |
36 #include "runtime/mutexLocker.hpp" | |
37 #include "utilities/debug.hpp" | |
342 | 38 |
39 // Different defaults for different number of GC threads | |
40 // They were chosen by running GCOld and SPECjbb on debris with different | |
41 // numbers of GC threads and choosing them based on the results | |
42 | |
43 // all the same | |
44 static double rs_length_diff_defaults[] = { | |
45 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
46 }; | |
47 | |
48 static double cost_per_card_ms_defaults[] = { | |
49 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
50 }; | |
51 | |
52 // all the same | |
4710 | 53 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 54 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
55 }; | |
56 | |
57 static double cost_per_entry_ms_defaults[] = { | |
58 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
59 }; | |
60 | |
61 static double cost_per_byte_ms_defaults[] = { | |
62 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
63 }; | |
64 | |
65 // these should be pretty consistent | |
66 static double constant_other_time_ms_defaults[] = { | |
67 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
68 }; | |
69 | |
70 | |
71 static double young_other_cost_per_region_ms_defaults[] = { | |
72 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
73 }; | |
74 | |
75 static double non_young_other_cost_per_region_ms_defaults[] = { | |
76 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
77 }; | |
78 | |
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79 // Help class for avoiding interleaved logging |
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80 class LineBuffer: public StackObj { |
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81 |
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82 private: |
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83 static const int BUFFER_LEN = 1024; |
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84 static const int INDENT_CHARS = 3; |
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85 char _buffer[BUFFER_LEN]; |
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86 int _indent_level; |
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87 int _cur; |
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88 |
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89 void vappend(const char* format, va_list ap) { |
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90 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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91 if (res != -1) { |
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92 _cur += res; |
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93 } else { |
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94 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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95 _buffer[BUFFER_LEN -1] = 0; |
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96 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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97 } |
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98 } |
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99 |
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100 public: |
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101 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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102 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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103 _buffer[_cur] = ' '; |
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104 } |
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105 } |
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106 |
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107 #ifndef PRODUCT |
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108 ~LineBuffer() { |
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109 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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110 } |
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111 #endif |
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112 |
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113 void append(const char* format, ...) { |
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114 va_list ap; |
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115 va_start(ap, format); |
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116 vappend(format, ap); |
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117 va_end(ap); |
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118 } |
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119 |
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120 void append_and_print_cr(const char* format, ...) { |
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121 va_list ap; |
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122 va_start(ap, format); |
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123 vappend(format, ap); |
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124 va_end(ap); |
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125 gclog_or_tty->print_cr("%s", _buffer); |
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126 _cur = _indent_level * INDENT_CHARS; |
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127 } |
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128 }; |
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129 |
342 | 130 G1CollectorPolicy::G1CollectorPolicy() : |
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131 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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132 ? ParallelGCThreads : 1), |
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133 |
342 | 134 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
135 _all_pause_times_ms(new NumberSeq()), | |
136 _stop_world_start(0.0), | |
137 _all_stop_world_times_ms(new NumberSeq()), | |
138 _all_yield_times_ms(new NumberSeq()), | |
139 | |
677 | 140 _summary(new Summary()), |
342 | 141 |
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142 _cur_clear_ct_time_ms(0.0), |
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143 _mark_closure_time_ms(0.0), |
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144 |
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145 _cur_ref_proc_time_ms(0.0), |
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146 _cur_ref_enq_time_ms(0.0), |
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147 |
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148 #ifndef PRODUCT |
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149 _min_clear_cc_time_ms(-1.0), |
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150 _max_clear_cc_time_ms(-1.0), |
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151 _cur_clear_cc_time_ms(0.0), |
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152 _cum_clear_cc_time_ms(0.0), |
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153 _num_cc_clears(0L), |
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154 #endif |
342 | 155 |
156 _aux_num(10), | |
157 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
158 _cur_aux_start_times_ms(new double[_aux_num]), | |
159 _cur_aux_times_ms(new double[_aux_num]), | |
160 _cur_aux_times_set(new bool[_aux_num]), | |
161 | |
162 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
163 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
164 | |
165 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
166 _prev_collection_pause_end_ms(0.0), | |
167 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
168 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
169 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 170 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
171 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 172 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 173 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 174 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
175 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
176 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
177 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
178 _non_young_other_cost_per_region_ms_seq( | |
179 new TruncatedSeq(TruncatedSeqLength)), | |
180 | |
181 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
182 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 | |
751 | 184 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 185 |
4710 | 186 _gcs_are_young(true), |
187 _young_pause_num(0), | |
188 _mixed_pause_num(0), | |
342 | 189 |
190 _during_marking(false), | |
191 _in_marking_window(false), | |
192 _in_marking_window_im(false), | |
193 | |
194 _known_garbage_ratio(0.0), | |
195 _known_garbage_bytes(0), | |
196 | |
197 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
198 | |
4710 | 199 _recent_prev_end_times_for_all_gcs_sec( |
200 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 201 |
202 _recent_avg_pause_time_ratio(0.0), | |
203 | |
204 _all_full_gc_times_ms(new NumberSeq()), | |
205 | |
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206 _initiate_conc_mark_if_possible(false), |
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207 _during_initial_mark_pause(false), |
4710 | 208 _should_revert_to_young_gcs(false), |
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 |
342 | 216 _prev_collection_pause_used_at_end_bytes(0), |
217 | |
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218 _eden_cset_region_length(0), |
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219 _survivor_cset_region_length(0), |
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220 _old_cset_region_length(0), |
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221 |
342 | 222 _collection_set(NULL), |
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223 _collection_set_bytes_used_before(0), |
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224 |
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225 // Incremental CSet attributes |
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226 _inc_cset_build_state(Inactive), |
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227 _inc_cset_head(NULL), |
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228 _inc_cset_tail(NULL), |
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229 _inc_cset_bytes_used_before(0), |
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230 _inc_cset_max_finger(NULL), |
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231 _inc_cset_recorded_rs_lengths(0), |
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232 _inc_cset_recorded_rs_lengths_diffs(0), |
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233 _inc_cset_predicted_elapsed_time_ms(0.0), |
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234 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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235 |
342 | 236 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
237 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
238 #endif // _MSC_VER | |
239 | |
240 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
241 G1YoungSurvRateNumRegionsSummary)), | |
242 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 243 G1YoungSurvRateNumRegionsSummary)), |
342 | 244 // add here any more surv rate groups |
545 | 245 _recorded_survivor_regions(0), |
246 _recorded_survivor_head(NULL), | |
247 _recorded_survivor_tail(NULL), | |
1356 | 248 _survivors_age_table(true), |
249 | |
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250 _gc_overhead_perc(0.0) { |
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251 |
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252 // Set up the region size and associated fields. Given that the |
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253 // policy is created before the heap, we have to set this up here, |
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254 // so it's done as soon as possible. |
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255 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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256 HeapRegionRemSet::setup_remset_size(); |
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257 |
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258 G1ErgoVerbose::initialize(); |
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259 if (PrintAdaptiveSizePolicy) { |
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260 // Currently, we only use a single switch for all the heuristics. |
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261 G1ErgoVerbose::set_enabled(true); |
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262 // Given that we don't currently have a verboseness level |
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263 // parameter, we'll hardcode this to high. This can be easily |
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264 // changed in the future. |
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265 G1ErgoVerbose::set_level(ErgoHigh); |
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266 } else { |
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267 G1ErgoVerbose::set_enabled(false); |
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268 } |
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269 |
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270 // Verify PLAB sizes |
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271 const size_t region_size = HeapRegion::GrainWords; |
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272 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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273 char buffer[128]; |
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274 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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275 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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276 vm_exit_during_initialization(buffer); |
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277 } |
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278 |
342 | 279 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
280 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
281 | |
1611 | 282 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 283 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
284 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
285 | |
286 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
287 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
288 | |
289 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
290 | |
291 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
292 | |
293 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 294 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
295 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 296 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
4023 | 297 _par_last_gc_worker_other_times_ms = new double[_parallel_gc_threads]; |
342 | 298 |
299 // start conservatively | |
751 | 300 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 301 |
302 int index; | |
303 if (ParallelGCThreads == 0) | |
304 index = 0; | |
305 else if (ParallelGCThreads > 8) | |
306 index = 7; | |
307 else | |
308 index = ParallelGCThreads - 1; | |
309 | |
310 _pending_card_diff_seq->add(0.0); | |
311 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
312 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 313 _young_cards_per_entry_ratio_seq->add( |
314 young_cards_per_entry_ratio_defaults[index]); | |
342 | 315 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
316 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
317 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
318 _young_other_cost_per_region_ms_seq->add( | |
319 young_other_cost_per_region_ms_defaults[index]); | |
320 _non_young_other_cost_per_region_ms_seq->add( | |
321 non_young_other_cost_per_region_ms_defaults[index]); | |
322 | |
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323 // Below, we might need to calculate the pause time target based on |
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324 // the pause interval. When we do so we are going to give G1 maximum |
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325 // flexibility and allow it to do pauses when it needs to. So, we'll |
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326 // arrange that the pause interval to be pause time target + 1 to |
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327 // ensure that a) the pause time target is maximized with respect to |
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328 // the pause interval and b) we maintain the invariant that pause |
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329 // time target < pause interval. If the user does not want this |
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330 // maximum flexibility, they will have to set the pause interval |
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331 // explicitly. |
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332 |
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333 // First make sure that, if either parameter is set, its value is |
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334 // reasonable. |
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335 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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336 if (MaxGCPauseMillis < 1) { |
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337 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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338 "greater than 0"); |
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339 } |
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340 } |
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341 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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342 if (GCPauseIntervalMillis < 1) { |
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343 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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344 "greater than 0"); |
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345 } |
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346 } |
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347 |
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348 // Then, if the pause time target parameter was not set, set it to |
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349 // the default value. |
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350 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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351 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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352 // The default pause time target in G1 is 200ms |
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353 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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354 } else { |
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355 // We do not allow the pause interval to be set without the |
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356 // pause time target |
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357 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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358 "without setting MaxGCPauseMillis"); |
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359 } |
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360 } |
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361 |
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362 // Then, if the interval parameter was not set, set it according to |
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363 // the pause time target (this will also deal with the case when the |
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364 // pause time target is the default value). |
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365 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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366 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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367 } |
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368 |
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369 // Finally, make sure that the two parameters are consistent. |
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370 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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371 char buffer[256]; |
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372 jio_snprintf(buffer, 256, |
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373 "MaxGCPauseMillis (%u) should be less than " |
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374 "GCPauseIntervalMillis (%u)", |
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375 MaxGCPauseMillis, GCPauseIntervalMillis); |
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376 vm_exit_during_initialization(buffer); |
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377 } |
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378 |
751 | 379 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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380 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 381 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 382 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 383 |
384 // start conservatively (around 50ms is about right) | |
385 _concurrent_mark_remark_times_ms->add(0.05); | |
386 _concurrent_mark_cleanup_times_ms->add(0.20); | |
387 _tenuring_threshold = MaxTenuringThreshold; | |
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388 // _max_survivor_regions will be calculated by |
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389 // update_young_list_target_length() during initialization. |
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390 _max_survivor_regions = 0; |
545 | 391 |
1356 | 392 assert(GCTimeRatio > 0, |
393 "we should have set it to a default value set_g1_gc_flags() " | |
394 "if a user set it to 0"); | |
395 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
396 | |
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397 uintx reserve_perc = G1ReservePercent; |
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398 // Put an artificial ceiling on this so that it's not set to a silly value. |
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399 if (reserve_perc > 50) { |
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400 reserve_perc = 50; |
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401 warning("G1ReservePercent is set to a value that is too large, " |
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402 "it's been updated to %u", reserve_perc); |
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403 } |
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404 _reserve_factor = (double) reserve_perc / 100.0; |
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405 // This will be set when the heap is expanded |
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406 // for the first time during initialization. |
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407 _reserve_regions = 0; |
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408 |
342 | 409 initialize_all(); |
4013 | 410 _collectionSetChooser = new CollectionSetChooser(); |
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411 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 412 } |
413 | |
414 void G1CollectorPolicy::initialize_flags() { | |
415 set_min_alignment(HeapRegion::GrainBytes); | |
416 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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417 if (SurvivorRatio < 1) { |
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418 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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419 } |
342 | 420 CollectorPolicy::initialize_flags(); |
421 } | |
422 | |
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423 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
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424 assert(G1DefaultMinNewGenPercent <= G1DefaultMaxNewGenPercent, "Min larger than max"); |
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425 assert(G1DefaultMinNewGenPercent > 0 && G1DefaultMinNewGenPercent < 100, "Min out of bounds"); |
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426 assert(G1DefaultMaxNewGenPercent > 0 && G1DefaultMaxNewGenPercent < 100, "Max out of bounds"); |
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427 |
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428 if (FLAG_IS_CMDLINE(NewRatio)) { |
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429 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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430 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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431 } else { |
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432 _sizer_kind = SizerNewRatio; |
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433 _adaptive_size = false; |
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434 return; |
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435 } |
3976 | 436 } |
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437 |
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438 if (FLAG_IS_CMDLINE(NewSize)) { |
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439 _min_desired_young_length = MAX2((size_t) 1, NewSize / HeapRegion::GrainBytes); |
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440 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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441 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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442 _sizer_kind = SizerMaxAndNewSize; |
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443 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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444 } else { |
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445 _sizer_kind = SizerNewSizeOnly; |
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446 } |
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447 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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448 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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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 size_t G1YoungGenSizer::calculate_default_min_length(size_t new_number_of_heap_regions) { |
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454 size_t default_value = (new_number_of_heap_regions * G1DefaultMinNewGenPercent) / 100; |
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455 return MAX2((size_t)1, default_value); |
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456 } |
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457 |
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458 size_t G1YoungGenSizer::calculate_default_max_length(size_t new_number_of_heap_regions) { |
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459 size_t default_value = (new_number_of_heap_regions * G1DefaultMaxNewGenPercent) / 100; |
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460 return MAX2((size_t)1, default_value); |
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461 } |
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462 |
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463 void G1YoungGenSizer::heap_size_changed(size_t 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(size_t young_length, |
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521 double base_time_ms, |
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522 size_t 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(size_t 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 = (size_t) 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 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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562 size_t base_min_length) { |
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563 size_t 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 = (size_t) 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 size_t 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 size_t 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 size_t absolute_min_length = base_min_length + 1; |
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600 size_t 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 size_t 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 size_t 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 size_t 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 { |
4710 | 633 if (gcs_are_young()) { |
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634 young_list_target_length = _young_list_fixed_length; |
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635 } else { |
4710 | 636 // A bit arbitrary: during mixed GCs we allocate half |
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637 // the young regions to try to add old regions to the CSet. |
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638 young_list_target_length = _young_list_fixed_length / 2; |
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639 // We choose to accept that we might go under the desired min |
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640 // length given that we intentionally ask for a smaller young gen. |
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641 desired_min_length = absolute_min_length; |
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642 } |
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643 } |
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644 |
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645 // Make sure we don't go over the desired max length, nor under the |
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646 // desired min length. In case they clash, desired_min_length wins |
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647 // which is why that test is second. |
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648 if (young_list_target_length > desired_max_length) { |
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649 young_list_target_length = desired_max_length; |
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650 } |
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651 if (young_list_target_length < desired_min_length) { |
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652 young_list_target_length = desired_min_length; |
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653 } |
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654 |
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655 assert(young_list_target_length > recorded_survivor_regions(), |
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656 "we should be able to allocate at least one eden region"); |
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657 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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658 _young_list_target_length = young_list_target_length; |
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659 |
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660 update_max_gc_locker_expansion(); |
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661 } |
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662 |
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663 size_t |
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664 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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665 size_t base_min_length, |
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666 size_t desired_min_length, |
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667 size_t desired_max_length) { |
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668 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 669 assert(gcs_are_young(), "only call this for young GCs"); |
3919
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670 |
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671 // In case some edge-condition makes the desired max length too small... |
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672 if (desired_max_length <= desired_min_length) { |
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673 return desired_min_length; |
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674 } |
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675 |
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676 // We'll adjust min_young_length and max_young_length not to include |
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677 // the already allocated young regions (i.e., so they reflect the |
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678 // min and max eden regions we'll allocate). The base_min_length |
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679 // will be reflected in the predictions by the |
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680 // survivor_regions_evac_time prediction. |
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681 assert(desired_min_length > base_min_length, "invariant"); |
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682 size_t min_young_length = desired_min_length - base_min_length; |
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683 assert(desired_max_length > base_min_length, "invariant"); |
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684 size_t max_young_length = desired_max_length - base_min_length; |
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685 |
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686 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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687 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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688 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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689 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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690 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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691 double base_time_ms = |
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692 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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693 survivor_regions_evac_time; |
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694 size_t available_free_regions = _free_regions_at_end_of_collection; |
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695 size_t base_free_regions = 0; |
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696 if (available_free_regions > _reserve_regions) { |
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697 base_free_regions = available_free_regions - _reserve_regions; |
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698 } |
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699 |
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700 // Here, we will make sure that the shortest young length that |
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701 // makes sense fits within the target pause time. |
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702 |
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703 if (predict_will_fit(min_young_length, base_time_ms, |
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704 base_free_regions, target_pause_time_ms)) { |
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705 // The shortest young length will fit into the target pause time; |
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706 // we'll now check whether the absolute maximum number of young |
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707 // regions will fit in the target pause time. If not, we'll do |
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708 // a binary search between min_young_length and max_young_length. |
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709 if (predict_will_fit(max_young_length, base_time_ms, |
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710 base_free_regions, target_pause_time_ms)) { |
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711 // The maximum young length will fit into the target pause time. |
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712 // We are done so set min young length to the maximum length (as |
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713 // the result is assumed to be returned in min_young_length). |
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714 min_young_length = max_young_length; |
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715 } else { |
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716 // The maximum possible number of young regions will not fit within |
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717 // the target pause time so we'll search for the optimal |
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718 // length. The loop invariants are: |
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719 // |
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720 // min_young_length < max_young_length |
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721 // min_young_length is known to fit into the target pause time |
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722 // max_young_length is known not to fit into the target pause time |
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723 // |
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724 // Going into the loop we know the above hold as we've just |
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725 // checked them. Every time around the loop we check whether |
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726 // the middle value between min_young_length and |
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727 // max_young_length fits into the target pause time. If it |
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728 // does, it becomes the new min. If it doesn't, it becomes |
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729 // the new max. This way we maintain the loop invariants. |
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730 |
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731 assert(min_young_length < max_young_length, "invariant"); |
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732 size_t diff = (max_young_length - min_young_length) / 2; |
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733 while (diff > 0) { |
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734 size_t young_length = min_young_length + diff; |
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735 if (predict_will_fit(young_length, base_time_ms, |
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736 base_free_regions, target_pause_time_ms)) { |
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737 min_young_length = young_length; |
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738 } else { |
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739 max_young_length = young_length; |
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740 } |
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741 assert(min_young_length < max_young_length, "invariant"); |
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742 diff = (max_young_length - min_young_length) / 2; |
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743 } |
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744 // The results is min_young_length which, according to the |
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745 // loop invariants, should fit within the target pause time. |
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746 |
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747 // These are the post-conditions of the binary search above: |
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748 assert(min_young_length < max_young_length, |
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749 "otherwise we should have discovered that max_young_length " |
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750 "fits into the pause target and not done the binary search"); |
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751 assert(predict_will_fit(min_young_length, base_time_ms, |
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752 base_free_regions, target_pause_time_ms), |
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753 "min_young_length, the result of the binary search, should " |
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754 "fit into the pause target"); |
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755 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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756 base_free_regions, target_pause_time_ms), |
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757 "min_young_length, the result of the binary search, should be " |
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758 "optimal, so no larger length should fit into the pause target"); |
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759 } |
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760 } else { |
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761 // Even the minimum length doesn't fit into the pause time |
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762 // target, return it as the result nevertheless. |
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763 } |
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764 return base_min_length + min_young_length; |
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765 } |
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766 |
545 | 767 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
768 double survivor_regions_evac_time = 0.0; | |
769 for (HeapRegion * r = _recorded_survivor_head; | |
770 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
771 r = r->get_next_young_region()) { | |
772 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
773 } | |
774 return survivor_regions_evac_time; | |
775 } | |
776 | |
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777 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 778 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
779 | |
1394
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780 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 781 if (rs_lengths > _rs_lengths_prediction) { |
782 // add 10% to avoid having to recalculate often | |
783 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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784 update_young_list_target_length(rs_lengths_prediction); |
342 | 785 } |
786 } | |
787 | |
3919
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788 |
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789 |
342 | 790 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
791 bool is_tlab, | |
792 bool* gc_overhead_limit_was_exceeded) { | |
793 guarantee(false, "Not using this policy feature yet."); | |
794 return NULL; | |
795 } | |
796 | |
797 // This method controls how a collector handles one or more | |
798 // of its generations being fully allocated. | |
799 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
800 bool is_tlab) { | |
801 guarantee(false, "Not using this policy feature yet."); | |
802 return NULL; | |
803 } | |
804 | |
805 | |
806 #ifndef PRODUCT | |
807 bool G1CollectorPolicy::verify_young_ages() { | |
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808 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 809 return |
810 verify_young_ages(head, _short_lived_surv_rate_group); | |
811 // also call verify_young_ages on any additional surv rate groups | |
812 } | |
813 | |
814 bool | |
815 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
816 SurvRateGroup *surv_rate_group) { | |
817 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
818 | |
819 const char* name = surv_rate_group->name(); | |
820 bool ret = true; | |
821 int prev_age = -1; | |
822 | |
823 for (HeapRegion* curr = head; | |
824 curr != NULL; | |
825 curr = curr->get_next_young_region()) { | |
826 SurvRateGroup* group = curr->surv_rate_group(); | |
827 if (group == NULL && !curr->is_survivor()) { | |
828 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
829 ret = false; | |
830 } | |
831 | |
832 if (surv_rate_group == group) { | |
833 int age = curr->age_in_surv_rate_group(); | |
834 | |
835 if (age < 0) { | |
836 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
837 ret = false; | |
838 } | |
839 | |
840 if (age <= prev_age) { | |
841 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
842 "(%d, %d)", name, age, prev_age); | |
843 ret = false; | |
844 } | |
845 prev_age = age; | |
846 } | |
847 } | |
848 | |
849 return ret; | |
850 } | |
851 #endif // PRODUCT | |
852 | |
853 void G1CollectorPolicy::record_full_collection_start() { | |
854 _cur_collection_start_sec = os::elapsedTime(); | |
855 // Release the future to-space so that it is available for compaction into. | |
856 _g1->set_full_collection(); | |
857 } | |
858 | |
859 void G1CollectorPolicy::record_full_collection_end() { | |
860 // Consider this like a collection pause for the purposes of allocation | |
861 // since last pause. | |
862 double end_sec = os::elapsedTime(); | |
863 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
864 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
865 | |
866 _all_full_gc_times_ms->add(full_gc_time_ms); | |
867 | |
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868 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 869 |
870 _g1->clear_full_collection(); | |
871 | |
4710 | 872 // "Nuke" the heuristics that control the young/mixed GC |
873 // transitions and make sure we start with young GCs after the Full GC. | |
874 set_gcs_are_young(true); | |
875 _last_young_gc = false; | |
876 _should_revert_to_young_gcs = false; | |
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877 clear_initiate_conc_mark_if_possible(); |
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878 clear_during_initial_mark_pause(); |
342 | 879 _known_garbage_bytes = 0; |
880 _known_garbage_ratio = 0.0; | |
881 _in_marking_window = false; | |
882 _in_marking_window_im = false; | |
883 | |
884 _short_lived_surv_rate_group->start_adding_regions(); | |
885 // also call this on any additional surv rate groups | |
886 | |
545 | 887 record_survivor_regions(0, NULL, NULL); |
888 | |
342 | 889 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 890 // Reset survivors SurvRateGroup. |
891 _survivor_surv_rate_group->reset(); | |
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892 update_young_list_target_length(); |
4013 | 893 _collectionSetChooser->updateAfterFullCollection(); |
1973 | 894 } |
342 | 895 |
896 void G1CollectorPolicy::record_stop_world_start() { | |
897 _stop_world_start = os::elapsedTime(); | |
898 } | |
899 | |
900 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
901 size_t start_used) { | |
902 if (PrintGCDetails) { | |
903 gclog_or_tty->stamp(PrintGCTimeStamps); | |
904 gclog_or_tty->print("[GC pause"); | |
4710 | 905 gclog_or_tty->print(" (%s)", gcs_are_young() ? "young" : "mixed"); |
342 | 906 } |
907 | |
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908 // We only need to do this here as the policy will only be applied |
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909 // to the GC we're about to start. so, no point is calculating this |
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910 // every time we calculate / recalculate the target young length. |
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911 update_survivors_policy(); |
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912 |
1973 | 913 assert(_g1->used() == _g1->recalculate_used(), |
914 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
915 _g1->used(), _g1->recalculate_used())); | |
342 | 916 |
917 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
918 _all_stop_world_times_ms->add(s_w_t_ms); | |
919 _stop_world_start = 0.0; | |
920 | |
921 _cur_collection_start_sec = start_time_sec; | |
922 _cur_collection_pause_used_at_start_bytes = start_used; | |
923 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
924 _pending_cards = _g1->pending_card_num(); | |
925 _max_pending_cards = _g1->max_pending_card_num(); | |
926 | |
927 _bytes_in_collection_set_before_gc = 0; | |
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928 _bytes_copied_during_gc = 0; |
342 | 929 |
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930 YoungList* young_list = _g1->young_list(); |
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931 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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932 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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933 _capacity_before_gc = _g1->capacity(); |
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934 |
342 | 935 #ifdef DEBUG |
936 // initialise these to something well known so that we can spot | |
937 // if they are not set properly | |
938 | |
939 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 940 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
941 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
942 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
943 _par_last_update_rs_times_ms[i] = -1234.0; | |
944 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
945 _par_last_scan_rs_times_ms[i] = -1234.0; | |
946 _par_last_obj_copy_times_ms[i] = -1234.0; | |
947 _par_last_termination_times_ms[i] = -1234.0; | |
948 _par_last_termination_attempts[i] = -1234.0; | |
949 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 950 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 951 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 952 } |
953 #endif | |
954 | |
955 for (int i = 0; i < _aux_num; ++i) { | |
956 _cur_aux_times_ms[i] = 0.0; | |
957 _cur_aux_times_set[i] = false; | |
958 } | |
959 | |
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960 // This is initialized to zero here and is set during |
4023 | 961 // the evacuation pause if marking is in progress. |
962 _cur_satb_drain_time_ms = 0.0; | |
342 | 963 |
4710 | 964 _last_gc_was_young = false; |
342 | 965 |
966 // do that for any other surv rate groups | |
967 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 968 _survivors_age_table.clear(); |
545 | 969 |
342 | 970 assert( verify_young_ages(), "region age verification" ); |
971 } | |
972 | |
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973 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 974 mark_init_elapsed_time_ms) { |
975 _during_marking = true; | |
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976 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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977 clear_during_initial_mark_pause(); |
342 | 978 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
979 } | |
980 | |
981 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
982 _mark_remark_start_sec = os::elapsedTime(); | |
983 _during_marking = false; | |
984 } | |
985 | |
986 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
987 double end_time_sec = os::elapsedTime(); | |
988 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
989 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
990 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
991 _prev_collection_pause_end_ms += elapsed_time_ms; | |
992 | |
993 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
994 } | |
995 | |
996 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
997 _mark_cleanup_start_sec = os::elapsedTime(); | |
998 } | |
999 | |
4013 | 1000 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 1001 _should_revert_to_young_gcs = false; |
1002 _last_young_gc = true; | |
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1003 _in_marking_window = false; |
342 | 1004 } |
1005 | |
1006 void G1CollectorPolicy::record_concurrent_pause() { | |
1007 if (_stop_world_start > 0.0) { | |
1008 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1009 _all_yield_times_ms->add(yield_ms); | |
1010 } | |
1011 } | |
1012 | |
1013 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1014 } | |
1015 | |
1016 template<class T> | |
1017 T sum_of(T* sum_arr, int start, int n, int N) { | |
1018 T sum = (T)0; | |
1019 for (int i = 0; i < n; i++) { | |
1020 int j = (start + i) % N; | |
1021 sum += sum_arr[j]; | |
1022 } | |
1023 return sum; | |
1024 } | |
1025 | |
1611 | 1026 void G1CollectorPolicy::print_par_stats(int level, |
1027 const char* str, | |
2430 | 1028 double* data) { |
342 | 1029 double min = data[0], max = data[0]; |
1030 double total = 0.0; | |
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1031 LineBuffer buf(level); |
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1032 buf.append("[%s (ms):", str); |
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1033 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1034 double val = data[i]; |
1035 if (val < min) | |
1036 min = val; | |
1037 if (val > max) | |
1038 max = val; | |
1039 total += val; | |
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1040 buf.append(" %3.1lf", val); |
342 | 1041 } |
2430 | 1042 buf.append_and_print_cr(""); |
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1043 double avg = total / (double) no_of_gc_threads(); |
2430 | 1044 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", |
1045 avg, min, max, max - min); | |
342 | 1046 } |
1047 | |
1611 | 1048 void G1CollectorPolicy::print_par_sizes(int level, |
1049 const char* str, | |
2430 | 1050 double* data) { |
342 | 1051 double min = data[0], max = data[0]; |
1052 double total = 0.0; | |
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1053 LineBuffer buf(level); |
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1054 buf.append("[%s :", str); |
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1055 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1056 double val = data[i]; |
1057 if (val < min) | |
1058 min = val; | |
1059 if (val > max) | |
1060 max = val; | |
1061 total += val; | |
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1062 buf.append(" %d", (int) val); |
342 | 1063 } |
2430 | 1064 buf.append_and_print_cr(""); |
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1065 double avg = total / (double) no_of_gc_threads(); |
2430 | 1066 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", |
1067 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1068 } |
1069 | |
4023 | 1070 void G1CollectorPolicy::print_stats(int level, |
1071 const char* str, | |
1072 double value) { | |
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1073 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1074 } |
1075 | |
4023 | 1076 void G1CollectorPolicy::print_stats(int level, |
1077 const char* str, | |
1078 int value) { | |
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1079 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1080 } |
1081 | |
4023 | 1082 double G1CollectorPolicy::avg_value(double* data) { |
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1083 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1084 double ret = 0.0; |
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1085 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1086 ret += data[i]; |
4023 | 1087 } |
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1088 return ret / (double) no_of_gc_threads(); |
342 | 1089 } else { |
1090 return data[0]; | |
1091 } | |
1092 } | |
1093 | |
4023 | 1094 double G1CollectorPolicy::max_value(double* data) { |
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1095 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1096 double ret = data[0]; |
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1097 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
4023 | 1098 if (data[i] > ret) { |
342 | 1099 ret = data[i]; |
4023 | 1100 } |
1101 } | |
342 | 1102 return ret; |
1103 } else { | |
1104 return data[0]; | |
1105 } | |
1106 } | |
1107 | |
4023 | 1108 double G1CollectorPolicy::sum_of_values(double* data) { |
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1109 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1110 double sum = 0.0; |
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1111 for (uint i = 0; i < no_of_gc_threads(); i++) { |
342 | 1112 sum += data[i]; |
4023 | 1113 } |
342 | 1114 return sum; |
1115 } else { | |
1116 return data[0]; | |
1117 } | |
1118 } | |
1119 | |
4023 | 1120 double G1CollectorPolicy::max_sum(double* data1, double* data2) { |
342 | 1121 double ret = data1[0] + data2[0]; |
1122 | |
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1123 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1124 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
342 | 1125 double data = data1[i] + data2[i]; |
4023 | 1126 if (data > ret) { |
342 | 1127 ret = data; |
4023 | 1128 } |
342 | 1129 } |
1130 } | |
1131 return ret; | |
1132 } | |
1133 | |
1134 // Anything below that is considered to be zero | |
1135 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1136 | |
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1137 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1138 double end_time_sec = os::elapsedTime(); |
1139 double elapsed_ms = _last_pause_time_ms; | |
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1140 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
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1141 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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1142 "otherwise, the subtraction below does not make sense"); |
342 | 1143 size_t rs_size = |
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1144 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1145 size_t cur_used_bytes = _g1->used(); |
1146 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1147 bool last_pause_included_initial_mark = false; | |
1707 | 1148 bool update_stats = !_g1->evacuation_failed(); |
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1149 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1150 |
1151 #ifndef PRODUCT | |
1152 if (G1YoungSurvRateVerbose) { | |
1153 gclog_or_tty->print_cr(""); | |
1154 _short_lived_surv_rate_group->print(); | |
1155 // do that for any other surv rate groups too | |
1156 } | |
1157 #endif // PRODUCT | |
1158 | |
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1159 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1160 if (last_pause_included_initial_mark) |
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1161 record_concurrent_mark_init_end(0.0); |
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1162 |
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1163 size_t marking_initiating_used_threshold = |
3867
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1164 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1165 |
4710 | 1166 if (!_g1->mark_in_progress() && !_last_young_gc) { |
3867
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1167 assert(!last_pause_included_initial_mark, "invariant"); |
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1168 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1169 if (cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
1359
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1170 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1171 |
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1172 ergo_verbose3(ErgoConcCycles, |
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1173 "request concurrent cycle initiation", |
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1174 ergo_format_reason("occupancy higher than threshold") |
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1175 ergo_format_byte("occupancy") |
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1176 ergo_format_byte_perc("threshold"), |
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1177 cur_used_bytes, |
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1178 marking_initiating_used_threshold, |
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1179 (double) InitiatingHeapOccupancyPercent); |
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1180 |
1359
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1181 // Note: this might have already been set, if during the last |
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1182 // pause we decided to start a cycle but at the beginning of |
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1183 // this pause we decided to postpone it. That's OK. |
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1184 set_initiate_conc_mark_if_possible(); |
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1185 } else { |
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1186 ergo_verbose2(ErgoConcCycles, |
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1187 "do not request concurrent cycle initiation", |
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1188 ergo_format_reason("occupancy lower than previous occupancy") |
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1189 ergo_format_byte("occupancy") |
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1190 ergo_format_byte("previous occupancy"), |
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1191 cur_used_bytes, |
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1192 _prev_collection_pause_used_at_end_bytes); |
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1193 } |
342 | 1194 } |
1195 } | |
1196 | |
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1197 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1198 |
342 | 1199 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1200 end_time_sec, false); | |
1201 | |
1202 // This assert is exempted when we're doing parallel collection pauses, | |
1203 // because the fragmentation caused by the parallel GC allocation buffers | |
1204 // can lead to more memory being used during collection than was used | |
1205 // before. Best leave this out until the fragmentation problem is fixed. | |
1206 // Pauses in which evacuation failed can also lead to negative | |
1207 // collections, since no space is reclaimed from a region containing an | |
1208 // object whose evacuation failed. | |
1209 // Further, we're now always doing parallel collection. But I'm still | |
1210 // leaving this here as a placeholder for a more precise assertion later. | |
1211 // (DLD, 10/05.) | |
1212 assert((true || parallel) // Always using GC LABs now. | |
1213 || _g1->evacuation_failed() | |
1214 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1215 "Negative collection"); | |
1216 | |
1217 size_t freed_bytes = | |
1218 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1219 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1220 |
342 | 1221 double survival_fraction = |
1222 (double)surviving_bytes/ | |
1223 (double)_collection_set_bytes_used_before; | |
1224 | |
4023 | 1225 // These values are used to update the summary information that is |
1226 // displayed when TraceGen0Time is enabled, and are output as part | |
1227 // of the PrintGCDetails output, in the non-parallel case. | |
1228 | |
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1229 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1230 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1231 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1232 double update_rs_processed_buffers = |
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1233 sum_of_values(_par_last_update_rs_processed_buffers); |
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1234 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1235 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1236 double termination_time = avg_value(_par_last_termination_times_ms); |
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1237 |
4023 | 1238 double known_time = ext_root_scan_time + |
1239 mark_stack_scan_time + | |
1240 update_rs_time + | |
1241 scan_rs_time + | |
1242 obj_copy_time; | |
1243 | |
1244 double other_time_ms = elapsed_ms; | |
1245 | |
1246 // Subtract the SATB drain time. It's initialized to zero at the | |
1247 // start of the pause and is updated during the pause if marking | |
1248 // is in progress. | |
1249 other_time_ms -= _cur_satb_drain_time_ms; | |
1250 | |
1251 if (parallel) { | |
1252 other_time_ms -= _cur_collection_par_time_ms; | |
1253 } else { | |
1254 other_time_ms -= known_time; | |
1255 } | |
1256 | |
1257 // Subtract the time taken to clean the card table from the | |
1258 // current value of "other time" | |
1259 other_time_ms -= _cur_clear_ct_time_ms; | |
1260 | |
4097
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1261 // Subtract the time spent completing marking in the collection |
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1262 // set. Note if marking is not in progress during the pause |
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1263 // the value of _mark_closure_time_ms will be zero. |
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1264 other_time_ms -= _mark_closure_time_ms; |
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1265 |
4023 | 1266 // TraceGen0Time and TraceGen1Time summary info updating. |
1267 _all_pause_times_ms->add(elapsed_ms); | |
3823
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1268 |
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1269 if (update_stats) { |
4023 | 1270 _summary->record_total_time_ms(elapsed_ms); |
1271 _summary->record_other_time_ms(other_time_ms); | |
1272 | |
1273 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1274 assert(body_summary != NULL, "should not be null!"); | |
1275 | |
1276 // This will be non-zero iff marking is currently in progress (i.e. | |
1277 // _g1->mark_in_progress() == true) and the currrent pause was not | |
1278 // an initial mark pause. Since the body_summary items are NumberSeqs, | |
1279 // however, they have to be consistent and updated in lock-step with | |
1280 // each other. Therefore we unconditionally record the SATB drain | |
1281 // time - even if it's zero. | |
1282 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
3823
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1283 |
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1284 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1285 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1286 body_summary->record_update_rs_time_ms(update_rs_time); |
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1287 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1288 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1289 |
3823
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1290 if (parallel) { |
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1291 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1292 body_summary->record_termination_time_ms(termination_time); |
4023 | 1293 |
1294 double parallel_known_time = known_time + termination_time; | |
1295 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
3823
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1296 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1297 } |
4023 | 1298 |
3823
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1299 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
4023 | 1300 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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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. |
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1330 size_t 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; | |
1086
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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. |
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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 | |
1370 // PrintGCDetails output | |
342 | 1371 if (PrintGCDetails) { |
4023 | 1372 bool print_marking_info = |
1373 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1374 | |
1707 | 1375 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1376 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1377 elapsed_ms / 1000.0); | |
1378 | |
4023 | 1379 if (print_marking_info) { |
1707 | 1380 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
1381 } | |
4023 | 1382 |
1707 | 1383 if (parallel) { |
1384 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1385 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1386 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1387 if (print_marking_info) { | |
1388 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1389 } | |
1707 | 1390 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1391 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
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); | |
2430 | 1395 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
4023 | 1396 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
2430 | 1397 |
1398 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1399 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
4023 | 1400 |
1401 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
1402 _par_last_mark_stack_scan_times_ms[i] + | |
1403 _par_last_update_rs_times_ms[i] + | |
1404 _par_last_scan_rs_times_ms[i] + | |
1405 _par_last_obj_copy_times_ms[i] + | |
1406 _par_last_termination_times_ms[i]; | |
1407 | |
1408 _par_last_gc_worker_other_times_ms[i] = _cur_collection_par_time_ms - worker_known_time; | |
2430 | 1409 } |
4023 | 1410 print_par_stats(2, "GC Worker", _par_last_gc_worker_times_ms); |
1411 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); | |
1707 | 1412 } else { |
4023 | 1413 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1414 if (print_marking_info) { | |
1415 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1416 } | |
1707 | 1417 print_stats(1, "Update RS", update_rs_time); |
4023 | 1418 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
1707 | 1419 print_stats(1, "Scan RS", scan_rs_time); |
1420 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1421 } |
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1422 if (print_marking_info) { |
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1423 print_stats(1, "Complete CSet Marking", _mark_closure_time_ms); |
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1424 } |
4023 | 1425 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
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1426 #ifndef PRODUCT |
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1427 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1428 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1429 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1430 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1431 if (_num_cc_clears > 0) { |
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1432 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1433 } |
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1434 #endif |
342 | 1435 print_stats(1, "Other", other_time_ms); |
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1436 print_stats(2, "Choose CSet", |
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1437 (_recorded_young_cset_choice_time_ms + |
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1438 _recorded_non_young_cset_choice_time_ms)); |
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1439 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1440 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1441 print_stats(2, "Free CSet", |
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1442 (_recorded_young_free_cset_time_ms + |
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1443 _recorded_non_young_free_cset_time_ms)); |
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1444 |
342 | 1445 for (int i = 0; i < _aux_num; ++i) { |
1446 if (_cur_aux_times_set[i]) { | |
1447 char buffer[96]; | |
1448 sprintf(buffer, "Aux%d", i); | |
1449 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1450 } | |
1451 } | |
1452 } | |
1453 | |
1454 // Update the efficiency-since-mark vars. | |
1455 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1456 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1457 // This usually happens due to the timer not having the required | |
1458 // granularity. Some Linuxes are the usual culprits. | |
1459 // We'll just set it to something (arbitrarily) small. | |
1460 proc_ms = 1.0; | |
1461 } | |
1462 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1463 | |
1464 bool new_in_marking_window = _in_marking_window; | |
1465 bool new_in_marking_window_im = false; | |
1359
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1466 if (during_initial_mark_pause()) { |
342 | 1467 new_in_marking_window = true; |
1468 new_in_marking_window_im = true; | |
1469 } | |
1470 | |
4710 | 1471 if (_last_young_gc) { |
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1472 if (!last_pause_included_initial_mark) { |
4710 | 1473 ergo_verbose2(ErgoMixedGCs, |
1474 "start mixed GCs", | |
3982
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1475 ergo_format_byte_perc("known garbage"), |
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1476 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
4710 | 1477 set_gcs_are_young(false); |
3982
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1478 } else { |
4710 | 1479 ergo_verbose0(ErgoMixedGCs, |
1480 "do not start mixed GCs", | |
3982
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1481 ergo_format_reason("concurrent cycle is about to start")); |
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1482 } |
4710 | 1483 _last_young_gc = false; |
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1484 } |
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1485 |
4710 | 1486 if (!_last_gc_was_young) { |
1487 if (_should_revert_to_young_gcs) { | |
1488 ergo_verbose2(ErgoMixedGCs, | |
1489 "end mixed GCs", | |
1490 ergo_format_reason("mixed GCs end requested") | |
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1491 ergo_format_byte_perc("known garbage"), |
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1492 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
4710 | 1493 set_gcs_are_young(true); |
3914
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1494 } else if (_known_garbage_ratio < 0.05) { |
4710 | 1495 ergo_verbose3(ErgoMixedGCs, |
1496 "end mixed GCs", | |
3914
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1497 ergo_format_reason("known garbage percent lower than threshold") |
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1498 ergo_format_byte_perc("known garbage") |
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1499 ergo_format_perc("threshold"), |
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1500 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
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1501 0.05 * 100.0); |
4710 | 1502 set_gcs_are_young(true); |
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1503 } else if (adaptive_young_list_length() && |
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1504 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
4710 | 1505 ergo_verbose5(ErgoMixedGCs, |
1506 "end mixed GCs", | |
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1507 ergo_format_reason("current GC efficiency lower than " |
4710 | 1508 "predicted young GC efficiency") |
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1509 ergo_format_double("GC efficiency factor") |
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1510 ergo_format_double("current GC efficiency") |
4710 | 1511 ergo_format_double("predicted young GC efficiency") |
3914
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1512 ergo_format_byte_perc("known garbage"), |
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1513 get_gc_eff_factor(), cur_efficiency, |
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1514 predict_young_gc_eff(), |
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1515 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
4710 | 1516 set_gcs_are_young(true); |
342 | 1517 } |
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1518 } |
4710 | 1519 _should_revert_to_young_gcs = false; |
1520 | |
1521 if (_last_gc_was_young && !_during_marking) { | |
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1522 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1523 } |
1524 | |
1525 _short_lived_surv_rate_group->start_adding_regions(); | |
1526 // do that for any other surv rate groupsx | |
1527 | |
677 | 1528 if (update_stats) { |
342 | 1529 double pause_time_ms = elapsed_ms; |
1530 | |
1531 size_t diff = 0; | |
1532 if (_max_pending_cards >= _pending_cards) | |
1533 diff = _max_pending_cards - _pending_cards; | |
1534 _pending_card_diff_seq->add((double) diff); | |
1535 | |
1536 double cost_per_card_ms = 0.0; | |
1537 if (_pending_cards > 0) { | |
1538 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1539 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1540 } | |
1541 | |
1542 size_t cards_scanned = _g1->cards_scanned(); | |
1543 | |
1544 double cost_per_entry_ms = 0.0; | |
1545 if (cards_scanned > 10) { | |
1546 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
4710 | 1547 if (_last_gc_was_young) { |
342 | 1548 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1549 } else { |
1550 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1551 } | |
342 | 1552 } |
1553 | |
1554 if (_max_rs_lengths > 0) { | |
1555 double cards_per_entry_ratio = | |
1556 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1557 if (_last_gc_was_young) { |
1558 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1559 } else { | |
1560 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1561 } | |
342 | 1562 } |
1563 | |
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1564 // This is defensive. For a while _max_rs_lengths could get |
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1565 // smaller than _recorded_rs_lengths which was causing |
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1566 // rs_length_diff to get very large and mess up the RSet length |
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1567 // predictions. The reason was unsafe concurrent updates to the |
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1568 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1569 // against (see CR 7118202). This bug has now been fixed (see CR |
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1570 // 7119027). However, I'm still worried that |
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1571 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1572 // inaccurate. The concurrent refinement thread calculates an |
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1573 // RSet's length concurrently with other CR threads updating it |
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1574 // which might cause it to calculate the length incorrectly (if, |
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1575 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1576 // conditional below just in case. |
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1577 size_t rs_length_diff = 0; |
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1578 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1579 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1580 } |
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1581 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1582 |
1583 size_t copied_bytes = surviving_bytes; | |
1584 double cost_per_byte_ms = 0.0; | |
1585 if (copied_bytes > 0) { | |
1586 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
4710 | 1587 if (_in_marking_window) { |
342 | 1588 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1589 } else { |
342 | 1590 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1591 } |
342 | 1592 } |
1593 | |
1594 double all_other_time_ms = pause_time_ms - | |
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1595 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1596 _mark_closure_time_ms + termination_time); |
1597 | |
1598 double young_other_time_ms = 0.0; | |
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1599 if (young_cset_region_length() > 0) { |
342 | 1600 young_other_time_ms = |
1601 _recorded_young_cset_choice_time_ms + | |
1602 _recorded_young_free_cset_time_ms; | |
1603 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1604 (double) young_cset_region_length()); |
342 | 1605 } |
1606 double non_young_other_time_ms = 0.0; | |
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1607 if (old_cset_region_length() > 0) { |
342 | 1608 non_young_other_time_ms = |
1609 _recorded_non_young_cset_choice_time_ms + | |
1610 _recorded_non_young_free_cset_time_ms; | |
1611 | |
1612 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1613 (double) old_cset_region_length()); |
342 | 1614 } |
1615 | |
1616 double constant_other_time_ms = all_other_time_ms - | |
1617 (young_other_time_ms + non_young_other_time_ms); | |
1618 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1619 | |
1620 double survival_ratio = 0.0; | |
1621 if (_bytes_in_collection_set_before_gc > 0) { | |
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1622 survival_ratio = (double) _bytes_copied_during_gc / |
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1623 (double) _bytes_in_collection_set_before_gc; |
342 | 1624 } |
1625 | |
1626 _pending_cards_seq->add((double) _pending_cards); | |
1627 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1628 | |
1629 double expensive_region_limit_ms = | |
751 | 1630 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1631 if (expensive_region_limit_ms < 0.0) { |
1632 // this means that the other time was predicted to be longer than | |
1633 // than the max pause time | |
751 | 1634 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1635 } |
1636 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1637 } | |
1638 | |
1639 _in_marking_window = new_in_marking_window; | |
1640 _in_marking_window_im = new_in_marking_window_im; | |
1641 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1642 update_young_list_target_length(); |
342 | 1643 |
1111 | 1644 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1645 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1646 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1647 |
1648 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1649 } |
1650 | |
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1651 #define EXT_SIZE_FORMAT "%d%s" |
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1652 #define EXT_SIZE_PARAMS(bytes) \ |
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1653 byte_size_in_proper_unit((bytes)), \ |
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1654 proper_unit_for_byte_size((bytes)) |
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1655 |
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1656 void G1CollectorPolicy::print_heap_transition() { |
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1657 if (PrintGCDetails) { |
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1658 YoungList* young_list = _g1->young_list(); |
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1659 size_t eden_bytes = young_list->eden_used_bytes(); |
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1660 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1661 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1662 size_t used = _g1->used(); |
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1663 size_t capacity = _g1->capacity(); |
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1664 size_t eden_capacity = |
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1665 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1666 |
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1667 gclog_or_tty->print_cr( |
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1668 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1669 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1670 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1671 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1672 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1673 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1674 EXT_SIZE_PARAMS(eden_bytes), |
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1675 EXT_SIZE_PARAMS(eden_capacity), |
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1676 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1677 EXT_SIZE_PARAMS(survivor_bytes), |
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1678 EXT_SIZE_PARAMS(used_before_gc), |
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1679 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1680 EXT_SIZE_PARAMS(used), |
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1681 EXT_SIZE_PARAMS(capacity)); |
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1682 |
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1683 _prev_eden_capacity = eden_capacity; |
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1684 } else if (PrintGC) { |
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1685 _g1->print_size_transition(gclog_or_tty, |
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1686 _cur_collection_pause_used_at_start_bytes, |
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1687 _g1->used(), _g1->capacity()); |
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1688 } |
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1689 } |
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1690 |
1111 | 1691 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1692 double update_rs_processed_buffers, | |
1693 double goal_ms) { | |
1694 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1695 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1696 | |
1282 | 1697 if (G1UseAdaptiveConcRefinement) { |
1111 | 1698 const int k_gy = 3, k_gr = 6; |
1699 const double inc_k = 1.1, dec_k = 0.9; | |
1700 | |
1701 int g = cg1r->green_zone(); | |
1702 if (update_rs_time > goal_ms) { | |
1703 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1704 } else { | |
1705 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1706 g = (int)MAX2(g * inc_k, g + 1.0); | |
1707 } | |
1708 } | |
1709 // Change the refinement threads params | |
1710 cg1r->set_green_zone(g); | |
1711 cg1r->set_yellow_zone(g * k_gy); | |
1712 cg1r->set_red_zone(g * k_gr); | |
1713 cg1r->reinitialize_threads(); | |
1714 | |
1715 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1716 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1717 cg1r->yellow_zone()); | |
1718 // Change the barrier params | |
1719 dcqs.set_process_completed_threshold(processing_threshold); | |
1720 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1721 } | |
1722 | |
1723 int curr_queue_size = dcqs.completed_buffers_num(); | |
1724 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1725 dcqs.set_completed_queue_padding(curr_queue_size); | |
1726 } else { | |
1727 dcqs.set_completed_queue_padding(0); | |
1728 } | |
1729 dcqs.notify_if_necessary(); | |
1730 } | |
1731 | |
342 | 1732 double |
1733 G1CollectorPolicy:: | |
1734 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1735 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1736 | |
1737 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1738 size_t young_num = g1h->young_list()->length(); |
342 | 1739 if (young_num == 0) |
1740 return 0.0; | |
1741 | |
1742 young_num += adjustment; | |
1743 size_t pending_cards = predict_pending_cards(); | |
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1744 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1745 predict_rs_length_diff(); |
1746 size_t card_num; | |
4710 | 1747 if (gcs_are_young()) { |
342 | 1748 card_num = predict_young_card_num(rs_lengths); |
4710 | 1749 } else { |
342 | 1750 card_num = predict_non_young_card_num(rs_lengths); |
4710 | 1751 } |
342 | 1752 size_t young_byte_size = young_num * HeapRegion::GrainBytes; |
1753 double accum_yg_surv_rate = | |
1754 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1755 | |
1756 size_t bytes_to_copy = | |
1757 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1758 | |
1759 return | |
1760 predict_rs_update_time_ms(pending_cards) + | |
1761 predict_rs_scan_time_ms(card_num) + | |
1762 predict_object_copy_time_ms(bytes_to_copy) + | |
1763 predict_young_other_time_ms(young_num) + | |
1764 predict_constant_other_time_ms(); | |
1765 } | |
1766 | |
1767 double | |
1768 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1769 size_t rs_length = predict_rs_length_diff(); | |
1770 size_t card_num; | |
4710 | 1771 if (gcs_are_young()) { |
342 | 1772 card_num = predict_young_card_num(rs_length); |
4710 | 1773 } else { |
342 | 1774 card_num = predict_non_young_card_num(rs_length); |
4710 | 1775 } |
342 | 1776 return predict_base_elapsed_time_ms(pending_cards, card_num); |
1777 } | |
1778 | |
1779 double | |
1780 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1781 size_t scanned_cards) { | |
1782 return | |
1783 predict_rs_update_time_ms(pending_cards) + | |
1784 predict_rs_scan_time_ms(scanned_cards) + | |
1785 predict_constant_other_time_ms(); | |
1786 } | |
1787 | |
1788 double | |
1789 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1790 bool young) { | |
1791 size_t rs_length = hr->rem_set()->occupied(); | |
1792 size_t card_num; | |
4710 | 1793 if (gcs_are_young()) { |
342 | 1794 card_num = predict_young_card_num(rs_length); |
4710 | 1795 } else { |
342 | 1796 card_num = predict_non_young_card_num(rs_length); |
4710 | 1797 } |
342 | 1798 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1799 | |
1800 double region_elapsed_time_ms = | |
1801 predict_rs_scan_time_ms(card_num) + | |
1802 predict_object_copy_time_ms(bytes_to_copy); | |
1803 | |
1804 if (young) | |
1805 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1806 else | |
1807 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1808 | |
1809 return region_elapsed_time_ms; | |
1810 } | |
1811 | |
1812 size_t | |
1813 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1814 size_t bytes_to_copy; | |
1815 if (hr->is_marked()) | |
1816 bytes_to_copy = hr->max_live_bytes(); | |
1817 else { | |
1818 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1819 "invariant" ); | |
1820 int age = hr->age_in_surv_rate_group(); | |
545 | 1821 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1822 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1823 } | |
1824 | |
1825 return bytes_to_copy; | |
1826 } | |
1827 | |
1828 void | |
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1829 G1CollectorPolicy::init_cset_region_lengths(size_t eden_cset_region_length, |
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1830 size_t survivor_cset_region_length) { |
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1831 _eden_cset_region_length = eden_cset_region_length; |
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1832 _survivor_cset_region_length = survivor_cset_region_length; |
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1833 _old_cset_region_length = 0; |
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1834 } |
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1835 |
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1836 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1837 _recorded_rs_lengths = rs_lengths; |
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1838 } |
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1839 |
342 | 1840 void G1CollectorPolicy::check_if_region_is_too_expensive(double |
1841 predicted_time_ms) { | |
1842 // I don't think we need to do this when in young GC mode since | |
1843 // marking will be initiated next time we hit the soft limit anyway... | |
1844 if (predicted_time_ms > _expensive_region_limit_ms) { | |
4710 | 1845 ergo_verbose2(ErgoMixedGCs, |
1846 "request mixed GCs end", | |
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1847 ergo_format_reason("predicted region time higher than threshold") |
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1848 ergo_format_ms("predicted region time") |
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1849 ergo_format_ms("threshold"), |
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1850 predicted_time_ms, _expensive_region_limit_ms); |
4710 | 1851 // no point in doing another mixed GC |
1852 _should_revert_to_young_gcs = true; | |
342 | 1853 } |
1854 } | |
1855 | |
1856 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1857 double elapsed_ms) { | |
1858 _recent_gc_times_ms->add(elapsed_ms); | |
1859 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1860 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1861 } | |
1862 | |
1863 size_t G1CollectorPolicy::expansion_amount() { | |
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1864 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1865 double threshold = _gc_overhead_perc; |
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1866 if (recent_gc_overhead > threshold) { |
751 | 1867 // We will double the existing space, or take |
1868 // G1ExpandByPercentOfAvailable % of the available expansion | |
1869 // space, whichever is smaller, bounded below by a minimum | |
1870 // expansion (unless that's all that's left.) | |
342 | 1871 const size_t min_expand_bytes = 1*M; |
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1872 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1873 size_t committed_bytes = _g1->capacity(); |
1874 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1875 size_t expand_bytes; | |
1876 size_t expand_bytes_via_pct = | |
751 | 1877 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1878 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1879 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1880 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1881 |
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1882 ergo_verbose5(ErgoHeapSizing, |
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1883 "attempt heap expansion", |
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1884 ergo_format_reason("recent GC overhead higher than " |
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1885 "threshold after GC") |
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1886 ergo_format_perc("recent GC overhead") |
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1887 ergo_format_perc("threshold") |
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1888 ergo_format_byte("uncommitted") |
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1889 ergo_format_byte_perc("calculated expansion amount"), |
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1890 recent_gc_overhead, threshold, |
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1891 uncommitted_bytes, |
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1892 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1893 |
342 | 1894 return expand_bytes; |
1895 } else { | |
1896 return 0; | |
1897 } | |
1898 } | |
1899 | |
1900 class CountCSClosure: public HeapRegionClosure { | |
1901 G1CollectorPolicy* _g1_policy; | |
1902 public: | |
1903 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1904 _g1_policy(g1_policy) {} | |
1905 bool doHeapRegion(HeapRegion* r) { | |
1906 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1907 return false; | |
1908 } | |
1909 }; | |
1910 | |
1911 void G1CollectorPolicy::count_CS_bytes_used() { | |
1912 CountCSClosure cs_closure(this); | |
1913 _g1->collection_set_iterate(&cs_closure); | |
1914 } | |
1915 | |
4023 | 1916 void G1CollectorPolicy::print_summary(int level, |
1917 const char* str, | |
1918 NumberSeq* seq) const { | |
342 | 1919 double sum = seq->sum(); |
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1920 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1921 str, sum / 1000.0, seq->avg()); |
1922 } | |
1923 | |
4023 | 1924 void G1CollectorPolicy::print_summary_sd(int level, |
1925 const char* str, | |
1926 NumberSeq* seq) const { | |
342 | 1927 print_summary(level, str, seq); |
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1928 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1929 seq->num(), seq->sd(), seq->maximum()); |
1930 } | |
1931 | |
1932 void G1CollectorPolicy::check_other_times(int level, | |
1933 NumberSeq* other_times_ms, | |
1934 NumberSeq* calc_other_times_ms) const { | |
1935 bool should_print = false; | |
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1936 LineBuffer buf(level + 2); |
342 | 1937 |
1938 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1939 fabs(calc_other_times_ms->sum())); | |
1940 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1941 fabs(calc_other_times_ms->sum())); | |
1942 double sum_ratio = max_sum / min_sum; | |
1943 if (sum_ratio > 1.1) { | |
1944 should_print = true; | |
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1945 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1946 } |
1947 | |
1948 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1949 fabs(calc_other_times_ms->avg())); | |
1950 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1951 fabs(calc_other_times_ms->avg())); | |
1952 double avg_ratio = max_avg / min_avg; | |
1953 if (avg_ratio > 1.1) { | |
1954 should_print = true; | |
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1955 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1956 } |
1957 | |
1958 if (other_times_ms->sum() < -0.01) { | |
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1959 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1960 } |
1961 | |
1962 if (other_times_ms->avg() < -0.01) { | |
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1963 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1964 } |
1965 | |
1966 if (calc_other_times_ms->sum() < -0.01) { | |
1967 should_print = true; | |
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1968 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1969 } |
1970 | |
1971 if (calc_other_times_ms->avg() < -0.01) { | |
1972 should_print = true; | |
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1973 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1974 } |
1975 | |
1976 if (should_print) | |
1977 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1978 } | |
1979 | |
1980 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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1981 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1982 MainBodySummary* body_summary = summary->main_body_summary(); |
1983 if (summary->get_total_seq()->num() > 0) { | |
677 | 1984 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1985 if (body_summary != NULL) { |
1986 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
1987 if (parallel) { | |
1988 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 1989 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
1990 print_summary(2, "Mark Stack Scanning", body_summary->get_mark_stack_scan_seq()); | |
342 | 1991 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
1992 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
1993 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
1994 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 1995 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 1996 { |
1997 NumberSeq* other_parts[] = { | |
1998 body_summary->get_ext_root_scan_seq(), | |
1999 body_summary->get_mark_stack_scan_seq(), | |
4023 | 2000 body_summary->get_update_rs_seq(), |
342 | 2001 body_summary->get_scan_rs_seq(), |
2002 body_summary->get_obj_copy_seq(), | |
2003 body_summary->get_termination_seq() | |
2004 }; | |
2005 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2006 6, other_parts); |
342 | 2007 check_other_times(2, body_summary->get_parallel_other_seq(), |
2008 &calc_other_times_ms); | |
2009 } | |
2010 } else { | |
4023 | 2011 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
2012 print_summary(1, "Mark Stack Scanning", body_summary->get_mark_stack_scan_seq()); | |
342 | 2013 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
2014 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2015 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2016 } | |
2017 } | |
4023 | 2018 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
2019 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
342 | 2020 print_summary(1, "Other", summary->get_other_seq()); |
2021 { | |
1779 | 2022 if (body_summary != NULL) { |
2023 NumberSeq calc_other_times_ms; | |
2024 if (parallel) { | |
2025 // parallel | |
2026 NumberSeq* other_parts[] = { | |
2027 body_summary->get_satb_drain_seq(), | |
2028 body_summary->get_parallel_seq(), | |
2029 body_summary->get_clear_ct_seq() | |
2030 }; | |
2031 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2032 3, other_parts); | |
2033 } else { | |
2034 // serial | |
2035 NumberSeq* other_parts[] = { | |
2036 body_summary->get_satb_drain_seq(), | |
2037 body_summary->get_update_rs_seq(), | |
2038 body_summary->get_ext_root_scan_seq(), | |
2039 body_summary->get_mark_stack_scan_seq(), | |
2040 body_summary->get_scan_rs_seq(), | |
2041 body_summary->get_obj_copy_seq() | |
2042 }; | |
2043 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2044 6, other_parts); | |
2045 } | |
2046 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2047 } |
2048 } | |
2049 } else { | |
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2050 LineBuffer(1).append_and_print_cr("none"); |
342 | 2051 } |
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2052 LineBuffer(0).append_and_print_cr(""); |
342 | 2053 } |
2054 | |
2055 void G1CollectorPolicy::print_tracing_info() const { | |
2056 if (TraceGen0Time) { | |
2057 gclog_or_tty->print_cr("ALL PAUSES"); | |
2058 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2059 gclog_or_tty->print_cr(""); | |
2060 gclog_or_tty->print_cr(""); | |
4710 | 2061 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
2062 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); | |
342 | 2063 gclog_or_tty->print_cr(""); |
2064 | |
677 | 2065 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2066 print_summary(_summary); | |
342 | 2067 |
2068 gclog_or_tty->print_cr("MISC"); | |
2069 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2070 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2071 for (int i = 0; i < _aux_num; ++i) { | |
2072 if (_all_aux_times_ms[i].num() > 0) { | |
2073 char buffer[96]; | |
2074 sprintf(buffer, "Aux%d", i); | |
2075 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2076 } | |
2077 } | |
2078 } | |
2079 if (TraceGen1Time) { | |
2080 if (_all_full_gc_times_ms->num() > 0) { | |
2081 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2082 _all_full_gc_times_ms->num(), | |
2083 _all_full_gc_times_ms->sum() / 1000.0); | |
2084 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2085 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2086 _all_full_gc_times_ms->sd(), | |
2087 _all_full_gc_times_ms->maximum()); | |
2088 } | |
2089 } | |
2090 } | |
2091 | |
2092 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2093 #ifndef PRODUCT | |
2094 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2095 // add this call for any other surv rate groups | |
2096 #endif // PRODUCT | |
2097 } | |
2098 | |
2099 #ifndef PRODUCT | |
2100 // for debugging, bit of a hack... | |
2101 static char* | |
2102 region_num_to_mbs(int length) { | |
2103 static char buffer[64]; | |
2104 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2105 double mbs = bytes / (double) (1024 * 1024); | |
2106 sprintf(buffer, "%7.2lfMB", mbs); | |
2107 return buffer; | |
2108 } | |
2109 #endif // PRODUCT | |
2110 | |
545 | 2111 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2112 switch (purpose) { |
2113 case GCAllocForSurvived: | |
545 | 2114 return _max_survivor_regions; |
342 | 2115 case GCAllocForTenured: |
545 | 2116 return REGIONS_UNLIMITED; |
342 | 2117 default: |
545 | 2118 ShouldNotReachHere(); |
2119 return REGIONS_UNLIMITED; | |
342 | 2120 }; |
2121 } | |
2122 | |
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2123 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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2124 size_t expansion_region_num = 0; |
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2125 if (GCLockerEdenExpansionPercent > 0) { |
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2126 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2127 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2128 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2129 // less than 1.0) we'll get 1. |
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2130 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2131 } else { |
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2132 assert(expansion_region_num == 0, "sanity"); |
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2133 } |
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2134 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2135 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2136 } |
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2137 |
545 | 2138 // Calculates survivor space parameters. |
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2139 void G1CollectorPolicy::update_survivors_policy() { |
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2140 double max_survivor_regions_d = |
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2141 (double) _young_list_target_length / (double) SurvivorRatio; |
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2142 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2143 // smaller than 1.0) we'll get 1. |
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2144 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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2145 |
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2146 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2147 HeapRegion::GrainWords * _max_survivor_regions); |
2148 } | |
2149 | |
342 | 2150 #ifndef PRODUCT |
2151 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2152 CollectionSetChooser* _chooser; | |
2153 public: | |
2154 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2155 _chooser(chooser) {} | |
2156 | |
2157 bool doHeapRegion(HeapRegion* r) { | |
2158 if (!r->continuesHumongous()) { | |
2159 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2160 } | |
2161 return false; | |
2162 } | |
2163 }; | |
2164 | |
4013 | 2165 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2166 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2167 _g1->heap_region_iterate(&cl); | |
2168 return true; | |
2169 } | |
2170 #endif | |
2171 | |
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2172 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2173 GCCause::Cause gc_cause) { |
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2174 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2175 if (!during_cycle) { |
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2176 ergo_verbose1(ErgoConcCycles, |
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2177 "request concurrent cycle initiation", |
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2178 ergo_format_reason("requested by GC cause") |
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2179 ergo_format_str("GC cause"), |
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2180 GCCause::to_string(gc_cause)); |
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2181 set_initiate_conc_mark_if_possible(); |
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2182 return true; |
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2183 } else { |
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2184 ergo_verbose1(ErgoConcCycles, |
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2185 "do not request concurrent cycle initiation", |
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2186 ergo_format_reason("concurrent cycle already in progress") |
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2187 ergo_format_str("GC cause"), |
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2188 GCCause::to_string(gc_cause)); |
1656
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2189 return false; |
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2190 } |
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2191 } |
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2192 |
342 | 2193 void |
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2194 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2195 // We are about to decide on whether this pause will be an |
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2196 // initial-mark pause. |
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2197 |
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2198 // First, during_initial_mark_pause() should not be already set. We |
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2199 // will set it here if we have to. However, it should be cleared by |
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2200 // the end of the pause (it's only set for the duration of an |
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2201 // initial-mark pause). |
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2202 assert(!during_initial_mark_pause(), "pre-condition"); |
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2203 |
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2204 if (initiate_conc_mark_if_possible()) { |
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2205 // We had noticed on a previous pause that the heap occupancy has |
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2206 // gone over the initiating threshold and we should start a |
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2207 // concurrent marking cycle. So we might initiate one. |
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2208 |
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2209 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2210 if (!during_cycle) { |
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2211 // The concurrent marking thread is not "during a cycle", i.e., |
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2212 // it has completed the last one. So we can go ahead and |
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2213 // initiate a new cycle. |
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2214 |
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2215 set_during_initial_mark_pause(); |
4710 | 2216 // We do not allow mixed GCs during marking. |
2217 if (!gcs_are_young()) { | |
2218 set_gcs_are_young(true); | |
2219 ergo_verbose0(ErgoMixedGCs, | |
2220 "end mixed GCs", | |
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2221 ergo_format_reason("concurrent cycle is about to start")); |
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2222 } |
1359
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2223 |
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2224 // And we can now clear initiate_conc_mark_if_possible() as |
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2225 // we've already acted on it. |
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2226 clear_initiate_conc_mark_if_possible(); |
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2227 |
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2228 ergo_verbose0(ErgoConcCycles, |
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2229 "initiate concurrent cycle", |
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2230 ergo_format_reason("concurrent cycle initiation requested")); |
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2231 } else { |
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2232 // The concurrent marking thread is still finishing up the |
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2233 // previous cycle. If we start one right now the two cycles |
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2234 // overlap. In particular, the concurrent marking thread might |
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2235 // be in the process of clearing the next marking bitmap (which |
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2236 // we will use for the next cycle if we start one). Starting a |
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2237 // cycle now will be bad given that parts of the marking |
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2238 // information might get cleared by the marking thread. And we |
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2239 // cannot wait for the marking thread to finish the cycle as it |
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2240 // periodically yields while clearing the next marking bitmap |
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2241 // and, if it's in a yield point, it's waiting for us to |
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2242 // finish. So, at this point we will not start a cycle and we'll |
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2243 // let the concurrent marking thread complete the last one. |
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2244 ergo_verbose0(ErgoConcCycles, |
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2245 "do not initiate concurrent cycle", |
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2246 ergo_format_reason("concurrent cycle already in progress")); |
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2247 } |
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2248 } |
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2249 } |
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2250 |
342 | 2251 class KnownGarbageClosure: public HeapRegionClosure { |
2252 CollectionSetChooser* _hrSorted; | |
2253 | |
2254 public: | |
2255 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2256 _hrSorted(hrSorted) | |
2257 {} | |
2258 | |
2259 bool doHeapRegion(HeapRegion* r) { | |
2260 // We only include humongous regions in collection | |
2261 // sets when concurrent mark shows that their contained object is | |
2262 // unreachable. | |
2263 | |
2264 // Do we have any marking information for this region? | |
2265 if (r->is_marked()) { | |
2266 // We don't include humongous regions in collection | |
2267 // sets because we collect them immediately at the end of a marking | |
2268 // cycle. We also don't include young regions because we *must* | |
2269 // include them in the next collection pause. | |
2270 if (!r->isHumongous() && !r->is_young()) { | |
2271 _hrSorted->addMarkedHeapRegion(r); | |
2272 } | |
2273 } | |
2274 return false; | |
2275 } | |
2276 }; | |
2277 | |
2278 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2279 CollectionSetChooser* _hrSorted; | |
2280 jint _marked_regions_added; | |
2281 jint _chunk_size; | |
2282 jint _cur_chunk_idx; | |
2283 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2284 int _worker; | |
2285 int _invokes; | |
2286 | |
2287 void get_new_chunk() { | |
2288 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2289 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2290 } | |
2291 void add_region(HeapRegion* r) { | |
2292 if (_cur_chunk_idx == _cur_chunk_end) { | |
2293 get_new_chunk(); | |
2294 } | |
2295 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2296 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2297 _marked_regions_added++; | |
2298 _cur_chunk_idx++; | |
2299 } | |
2300 | |
2301 public: | |
2302 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2303 jint chunk_size, | |
2304 int worker) : | |
2305 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2306 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2307 _invokes(0) | |
2308 {} | |
2309 | |
2310 bool doHeapRegion(HeapRegion* r) { | |
2311 // We only include humongous regions in collection | |
2312 // sets when concurrent mark shows that their contained object is | |
2313 // unreachable. | |
2314 _invokes++; | |
2315 | |
2316 // Do we have any marking information for this region? | |
2317 if (r->is_marked()) { | |
2318 // We don't include humongous regions in collection | |
2319 // sets because we collect them immediately at the end of a marking | |
2320 // cycle. | |
2321 // We also do not include young regions in collection sets | |
2322 if (!r->isHumongous() && !r->is_young()) { | |
2323 add_region(r); | |
2324 } | |
2325 } | |
2326 return false; | |
2327 } | |
2328 jint marked_regions_added() { return _marked_regions_added; } | |
2329 int invokes() { return _invokes; } | |
2330 }; | |
2331 | |
2332 class ParKnownGarbageTask: public AbstractGangTask { | |
2333 CollectionSetChooser* _hrSorted; | |
2334 jint _chunk_size; | |
2335 G1CollectedHeap* _g1; | |
2336 public: | |
2337 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2338 AbstractGangTask("ParKnownGarbageTask"), | |
2339 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2340 _g1(G1CollectedHeap::heap()) | |
2341 {} | |
2342 | |
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2343 void work(uint worker_id) { |
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2344 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, |
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2345 _chunk_size, |
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2346 worker_id); |
342 | 2347 // Back to zero for the claim value. |
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2348 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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2349 _g1->workers()->active_workers(), |
355 | 2350 HeapRegion::InitialClaimValue); |
342 | 2351 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2352 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2353 if (G1PrintParCleanupStats) { | |
2363
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2354 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
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2355 worker_id, parKnownGarbageCl.invokes(), regions_added); |
342 | 2356 } |
2357 } | |
2358 }; | |
2359 | |
2360 void | |
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2361 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
4013 | 2362 double start_sec; |
2363 if (G1PrintParCleanupStats) { | |
2364 start_sec = os::elapsedTime(); | |
2365 } | |
342 | 2366 |
2367 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2368 double clear_marked_end_sec; |
342 | 2369 if (G1PrintParCleanupStats) { |
4013 | 2370 clear_marked_end_sec = os::elapsedTime(); |
2371 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2372 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2373 } |
4013 | 2374 |
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2375 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2376 const size_t OverpartitionFactor = 4; |
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2377 size_t WorkUnit; |
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2378 // The use of MinChunkSize = 8 in the original code |
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2379 // causes some assertion failures when the total number of |
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|
2380 // region is less than 8. The code here tries to fix that. |
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2381 // Should the original code also be fixed? |
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|
2382 if (no_of_gc_threads > 0) { |
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2383 const size_t MinWorkUnit = |
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2384 MAX2(_g1->n_regions() / no_of_gc_threads, (size_t) 1U); |
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|
2385 WorkUnit = |
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|
2386 MAX2(_g1->n_regions() / (no_of_gc_threads * OverpartitionFactor), |
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|
2387 MinWorkUnit); |
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|
2388 } else { |
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|
2389 assert(no_of_gc_threads > 0, |
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|
2390 "The active gc workers should be greater than 0"); |
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2391 // In a product build do something reasonable to avoid a crash. |
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2392 const size_t MinWorkUnit = |
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2393 MAX2(_g1->n_regions() / ParallelGCThreads, (size_t) 1U); |
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|
2394 WorkUnit = |
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|
2395 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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|
2396 MinWorkUnit); |
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|
2397 } |
342 | 2398 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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|
2399 WorkUnit); |
342 | 2400 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2401 (int) WorkUnit); |
342 | 2402 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2403 |
2404 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2405 "sanity check"); | |
342 | 2406 } else { |
2407 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2408 _g1->heap_region_iterate(&knownGarbagecl); | |
2409 } | |
4013 | 2410 double known_garbage_end_sec; |
342 | 2411 if (G1PrintParCleanupStats) { |
4013 | 2412 known_garbage_end_sec = os::elapsedTime(); |
342 | 2413 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2414 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2415 } |
4013 | 2416 |
342 | 2417 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2418 double end_sec = os::elapsedTime(); |
342 | 2419 if (G1PrintParCleanupStats) { |
2420 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2421 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2422 } |
2423 | |
4013 | 2424 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2425 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2426 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2427 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2428 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2429 } |
2430 | |
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2431 // Add the heap region at the head of the non-incremental collection set |
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|
2432 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
1394
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2433 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
2434 assert(!hr->is_young(), "non-incremental add of young region"); |
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|
2435 |
342 | 2436 if (_g1->mark_in_progress()) |
2437 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2438 | |
1394
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|
2439 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2440 hr->set_in_collection_set(true); |
2441 hr->set_next_in_collection_set(_collection_set); | |
2442 _collection_set = hr; | |
2443 _collection_set_bytes_used_before += hr->used(); | |
526 | 2444 _g1->register_region_with_in_cset_fast_test(hr); |
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|
2445 size_t rs_length = hr->rem_set()->occupied(); |
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|
2446 _recorded_rs_lengths += rs_length; |
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|
2447 _old_cset_region_length += 1; |
342 | 2448 } |
2449 | |
1394
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|
2450 // Initialize the per-collection-set information |
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|
2451 void G1CollectorPolicy::start_incremental_cset_building() { |
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|
2452 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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|
2453 |
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|
2454 _inc_cset_head = NULL; |
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|
2455 _inc_cset_tail = NULL; |
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|
2456 _inc_cset_bytes_used_before = 0; |
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|
2457 |
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|
2458 _inc_cset_max_finger = 0; |
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|
2459 _inc_cset_recorded_rs_lengths = 0; |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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4710
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|
2460 _inc_cset_recorded_rs_lengths_diffs = 0; |
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|
2461 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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|
2462 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
1394
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|
2463 _inc_cset_build_state = Active; |
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|
2464 } |
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|
2465 |
4727
67fdcb391461
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|
2466 void G1CollectorPolicy::finalize_incremental_cset_building() { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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4710
diff
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|
2467 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
2468 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
67fdcb391461
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|
2469 |
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diff
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|
2470 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
67fdcb391461
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diff
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|
2471 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2472 // that adds a new region to the CSet. Further updates by the |
67fdcb391461
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diff
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|
2473 // concurrent refinement thread that samples the young RSet lengths |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2474 // are accumulated in the *_diffs fields. Here we add the diffs to |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2475 // the "main" fields. |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2476 |
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|
2477 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
|
2478 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2479 } else { |
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changeset
|
2480 // This is defensive. The diff should in theory be always positive |
67fdcb391461
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diff
changeset
|
2481 // as RSets can only grow between GCs. However, given that we |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
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|
2482 // sample their size concurrently with other threads updating them |
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|
2483 // it's possible that we might get the wrong size back, which |
67fdcb391461
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diff
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|
2484 // could make the calculations somewhat inaccurate. |
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4710
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changeset
|
2485 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2486 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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4710
diff
changeset
|
2487 _inc_cset_recorded_rs_lengths -= diffs; |
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|
2488 } else { |
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|
2489 _inc_cset_recorded_rs_lengths = 0; |
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|
2490 } |
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|
2491 } |
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|
2492 _inc_cset_predicted_elapsed_time_ms += |
67fdcb391461
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|
2493 _inc_cset_predicted_elapsed_time_ms_diffs; |
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|
2494 |
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|
2495 _inc_cset_recorded_rs_lengths_diffs = 0; |
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|
2496 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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|
2497 } |
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|
2498 |
1394
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|
2499 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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|
2500 // This routine is used when: |
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|
2501 // * adding survivor regions to the incremental cset at the end of an |
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|
2502 // evacuation pause, |
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|
2503 // * adding the current allocation region to the incremental cset |
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|
2504 // when it is retired, and |
1316cec51b4d
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changeset
|
2505 // * updating existing policy information for a region in the |
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|
2506 // incremental cset via young list RSet sampling. |
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|
2507 // Therefore this routine may be called at a safepoint by the |
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|
2508 // VM thread, or in-between safepoints by mutator threads (when |
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|
2509 // retiring the current allocation region) or a concurrent |
1316cec51b4d
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diff
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|
2510 // refine thread (RSet sampling). |
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|
2511 |
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|
2512 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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|
2513 size_t used_bytes = hr->used(); |
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|
2514 _inc_cset_recorded_rs_lengths += rs_length; |
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|
2515 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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|
2516 _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
|
2517 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2518 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2519 // 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
|
2520 // 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
|
2521 // rset sampling code |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2522 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
|
2523 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
|
2524 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2525 |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2526 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2527 size_t new_rs_length) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2528 // 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
|
2529 assert(hr->is_young(), "Precondition"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2530 assert(!SafepointSynchronize::is_at_safepoint(), |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2531 "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
|
2532 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2533 // 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
|
2534 // _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
|
2535 // 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
|
2536 // 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
|
2537 // 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
|
2538 // 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
|
2539 // 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
|
2540 // 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
|
2541 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2542 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
|
2543 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
|
2544 _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
|
2545 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2546 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
|
2547 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
|
2548 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
|
2549 _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
|
2550 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2551 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
|
2552 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
|
2553 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2554 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2555 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
|
2556 assert(hr->is_young(), "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2557 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
|
2558 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
|
2559 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2560 // 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
|
2561 // 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
|
2562 // 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
|
2563 // 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
|
2564 // 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
|
2565 // 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
|
2566 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2567 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
|
2568 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
|
2569 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2570 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
|
2571 _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
|
2572 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2573 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
|
2574 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
|
2575 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
|
2576 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2577 _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
|
2578 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2579 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2580 // 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
|
2581 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
|
2582 // 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
|
2583 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
|
2584 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2585 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2586 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
|
2587 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2588 // 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
|
2589 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
|
2590 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
|
2591 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2592 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2593 _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
|
2594 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2595 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2596 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2597 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2598 // 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
|
2599 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
|
2600 // 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
|
2601 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
|
2602 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2603 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2604 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
|
2605 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2606 // 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
|
2607 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
|
2608 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
|
2609 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
|
2610 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2611 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2612 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2613 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2614 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2615 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2616 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
|
2617 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
|
2618 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2619 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
|
2620 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2621 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2622 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
|
2623 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
|
2624 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
|
2625 "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
|
2626 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2627 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2628 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
|
2629 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
|
2630 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
|
2631 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
|
2632 csr->is_young(), |
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2633 csr->is_survivor()); |
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2634 csr = next; |
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|
2635 } |
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|
2636 } |
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|
2637 #endif // !PRODUCT |
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2638 |
4013 | 2639 void G1CollectorPolicy::choose_collection_set(double target_pause_time_ms) { |
1394
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2640 // Set this here - in case we're not doing young collections. |
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2641 double non_young_start_time_sec = os::elapsedTime(); |
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2642 |
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2643 YoungList* young_list = _g1->young_list(); |
4727
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2644 finalize_incremental_cset_building(); |
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2645 |
1656
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2646 guarantee(target_pause_time_ms > 0.0, |
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2647 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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|
2648 target_pause_time_ms)); |
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|
2649 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2650 |
2651 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2652 double predicted_pause_time_ms = base_time_ms; | |
2653 | |
1656
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2654 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2655 |
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2656 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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2657 "start choosing CSet", |
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2658 ergo_format_ms("predicted base time") |
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2659 ergo_format_ms("remaining time") |
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2660 ergo_format_ms("target pause time"), |
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|
2661 base_time_ms, time_remaining_ms, target_pause_time_ms); |
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2662 |
342 | 2663 // the 10% and 50% values are arbitrary... |
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2664 double threshold = 0.10 * target_pause_time_ms; |
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2665 if (time_remaining_ms < threshold) { |
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2666 double prev_time_remaining_ms = time_remaining_ms; |
1656
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2667 time_remaining_ms = 0.50 * target_pause_time_ms; |
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2668 ergo_verbose3(ErgoCSetConstruction, |
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|
2669 "adjust remaining time", |
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|
2670 ergo_format_reason("remaining time lower than threshold") |
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|
2671 ergo_format_ms("remaining time") |
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|
2672 ergo_format_ms("threshold") |
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|
2673 ergo_format_ms("adjusted remaining time"), |
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|
2674 prev_time_remaining_ms, threshold, time_remaining_ms); |
342 | 2675 } |
2676 | |
3914
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|
2677 size_t expansion_bytes = _g1->expansion_regions() * HeapRegion::GrainBytes; |
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|
2678 |
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|
2679 HeapRegion* hr; |
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|
2680 double young_start_time_sec = os::elapsedTime(); |
342 | 2681 |
677 | 2682 _collection_set_bytes_used_before = 0; |
4710 | 2683 _last_gc_was_young = gcs_are_young() ? true : false; |
2684 | |
2685 if (_last_gc_was_young) { | |
2686 ++_young_pause_num; | |
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|
2687 } else { |
4710 | 2688 ++_mixed_pause_num; |
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|
2689 } |
3867
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|
2690 |
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2691 // The young list is laid with the survivor regions from the previous |
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2692 // pause are appended to the RHS of the young list, i.e. |
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2693 // [Newly Young Regions ++ Survivors from last pause]. |
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2694 |
4090
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|
2695 size_t survivor_region_length = young_list->survivor_length(); |
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2696 size_t eden_region_length = young_list->length() - survivor_region_length; |
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|
2697 init_cset_region_lengths(eden_region_length, survivor_region_length); |
3914
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|
2698 hr = young_list->first_survivor_region(); |
3867
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|
2699 while (hr != NULL) { |
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|
2700 assert(hr->is_survivor(), "badly formed young list"); |
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|
2701 hr->set_young(); |
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|
2702 hr = hr->get_next_young_region(); |
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|
2703 } |
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|
2704 |
3914
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|
2705 // Clear the fields that point to the survivor list - they are all young now. |
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|
2706 young_list->clear_survivors(); |
3867
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|
2707 |
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|
2708 if (_g1->mark_in_progress()) |
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|
2709 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
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|
2710 |
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|
2711 _collection_set = _inc_cset_head; |
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|
2712 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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|
2713 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
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|
2714 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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|
2715 |
3914
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|
2716 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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|
2717 "add young regions to CSet", |
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|
2718 ergo_format_region("eden") |
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|
2719 ergo_format_region("survivors") |
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|
2720 ergo_format_ms("predicted young region time"), |
4090
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|
2721 eden_region_length, survivor_region_length, |
3914
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|
2722 _inc_cset_predicted_elapsed_time_ms); |
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|
2723 |
3867
ff53346271fe
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|
2724 // The number of recorded young regions is the incremental |
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|
2725 // collection set's current size |
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|
2726 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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|
2727 |
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|
2728 double young_end_time_sec = os::elapsedTime(); |
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|
2729 _recorded_young_cset_choice_time_ms = |
ff53346271fe
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|
2730 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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|
2731 |
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|
2732 // We are doing young collections so reset this. |
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|
2733 non_young_start_time_sec = young_end_time_sec; |
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|
2734 |
4710 | 2735 if (!gcs_are_young()) { |
342 | 2736 bool should_continue = true; |
2737 NumberSeq seq; | |
2738 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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|
2739 |
3914
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|
2740 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
342 | 2741 do { |
4090
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|
2742 // Note that add_old_region_to_cset() increments the |
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|
2743 // _old_cset_region_length field and cset_region_length() returns the |
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|
2744 // sum of _eden_cset_region_length, _survivor_cset_region_length, and |
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|
2745 // _old_cset_region_length. So, as old regions are added to the |
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|
2746 // CSet, _old_cset_region_length will be incremented and |
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|
2747 // cset_region_length(), which is used below, will always reflect |
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|
2748 // the the total number of regions added up to this point to the CSet. |
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|
2749 |
342 | 2750 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, |
2751 avg_prediction); | |
677 | 2752 if (hr != NULL) { |
4072 | 2753 _g1->old_set_remove(hr); |
342 | 2754 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2755 time_remaining_ms -= predicted_time_ms; | |
2756 predicted_pause_time_ms += predicted_time_ms; | |
4090
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|
2757 add_old_region_to_cset(hr); |
342 | 2758 seq.add(predicted_time_ms); |
2759 avg_prediction = seq.avg() + seq.sd(); | |
2760 } | |
3914
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|
2761 |
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|
2762 should_continue = true; |
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|
2763 if (hr == NULL) { |
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|
2764 // No need for an ergo verbose message here, |
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|
2765 // getNextMarkRegion() does this when it returns NULL. |
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|
2766 should_continue = false; |
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|
2767 } else { |
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|
2768 if (adaptive_young_list_length()) { |
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|
2769 if (time_remaining_ms < 0.0) { |
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|
2770 ergo_verbose1(ErgoCSetConstruction, |
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changeset
|
2771 "stop adding old regions to CSet", |
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2772 ergo_format_reason("remaining time is lower than 0") |
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2773 ergo_format_ms("remaining time"), |
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2774 time_remaining_ms); |
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2775 should_continue = false; |
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2776 } |
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2777 } else { |
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2778 if (cset_region_length() >= _young_list_fixed_length) { |
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2779 ergo_verbose2(ErgoCSetConstruction, |
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2780 "stop adding old regions to CSet", |
3927
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2781 ergo_format_reason("CSet length reached target") |
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2782 ergo_format_region("CSet") |
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2783 ergo_format_region("young target"), |
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2784 cset_region_length(), _young_list_fixed_length); |
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2785 should_continue = false; |
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2786 } |
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2787 } |
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2788 } |
342 | 2789 } while (should_continue); |
2790 | |
2791 if (!adaptive_young_list_length() && | |
4710 | 2792 cset_region_length() < _young_list_fixed_length) { |
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2793 ergo_verbose2(ErgoCSetConstruction, |
4710 | 2794 "request mixed GCs end", |
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2795 ergo_format_reason("CSet length lower than target") |
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2796 ergo_format_region("CSet") |
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2797 ergo_format_region("young target"), |
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2798 cset_region_length(), _young_list_fixed_length); |
4710 | 2799 _should_revert_to_young_gcs = true; |
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2800 } |
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2801 |
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2802 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
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2803 "add old regions to CSet", |
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2804 ergo_format_region("old") |
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2805 ergo_format_ms("predicted old region time"), |
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2806 old_cset_region_length(), |
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2807 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
342 | 2808 } |
2809 | |
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2810 stop_incremental_cset_building(); |
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2811 |
342 | 2812 count_CS_bytes_used(); |
2813 | |
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2814 ergo_verbose5(ErgoCSetConstruction, |
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2815 "finish choosing CSet", |
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2816 ergo_format_region("eden") |
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2817 ergo_format_region("survivors") |
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2818 ergo_format_region("old") |
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2819 ergo_format_ms("predicted pause time") |
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2820 ergo_format_ms("target pause time"), |
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2821 eden_region_length, survivor_region_length, |
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2822 old_cset_region_length(), |
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2823 predicted_pause_time_ms, target_pause_time_ms); |
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2824 |
342 | 2825 double non_young_end_time_sec = os::elapsedTime(); |
2826 _recorded_non_young_cset_choice_time_ms = | |
2827 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2828 } |