Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 4096:00dd86e542eb
7114303: G1: assert(_g1->mark_in_progress()) failed: shouldn't be here otherwise
Summary: Race between the VM thread reading G1CollectedHeap::_mark_in_progress and it being set by the concurrent mark thread when concurrent marking is aborted by a full GC. Have the concurrent mark thread join the SuspendibleThreadSet before changing the marking state.
Reviewed-by: tonyp, brutisso
author | johnc |
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date | Mon, 28 Nov 2011 09:49:05 -0800 |
parents | bca17e38de00 |
children | dc467e8b2c5e |
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 | |
53 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
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 | |
2363
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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()), | |
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139 _using_new_ratio_calculations(false), |
342 | 140 |
677 | 141 _summary(new Summary()), |
342 | 142 |
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143 _cur_clear_ct_time_ms(0.0), |
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144 |
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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)), | |
170 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
171 _partially_young_cards_per_entry_ratio_seq( | |
172 new TruncatedSeq(TruncatedSeqLength)), | |
173 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
174 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
175 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
176 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
177 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
178 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
179 _non_young_other_cost_per_region_ms_seq( | |
180 new TruncatedSeq(TruncatedSeqLength)), | |
181 | |
182 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
184 | |
751 | 185 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 186 |
187 _full_young_gcs(true), | |
188 _full_young_pause_num(0), | |
189 _partial_young_pause_num(0), | |
190 | |
191 _during_marking(false), | |
192 _in_marking_window(false), | |
193 _in_marking_window_im(false), | |
194 | |
195 _known_garbage_ratio(0.0), | |
196 _known_garbage_bytes(0), | |
197 | |
198 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
199 | |
200 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
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), |
342 | 208 _should_revert_to_full_young_gcs(false), |
209 _last_full_young_gc(false), | |
210 | |
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211 _eden_bytes_before_gc(0), |
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212 _survivor_bytes_before_gc(0), |
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213 _capacity_before_gc(0), |
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214 |
342 | 215 _prev_collection_pause_used_at_end_bytes(0), |
216 | |
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217 _eden_cset_region_length(0), |
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218 _survivor_cset_region_length(0), |
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219 _old_cset_region_length(0), |
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220 |
342 | 221 _collection_set(NULL), |
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222 _collection_set_bytes_used_before(0), |
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223 |
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224 // Incremental CSet attributes |
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225 _inc_cset_build_state(Inactive), |
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226 _inc_cset_head(NULL), |
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227 _inc_cset_tail(NULL), |
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228 _inc_cset_bytes_used_before(0), |
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229 _inc_cset_max_finger(NULL), |
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230 _inc_cset_recorded_rs_lengths(0), |
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231 _inc_cset_predicted_elapsed_time_ms(0.0), |
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232 |
342 | 233 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
234 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
235 #endif // _MSC_VER | |
236 | |
237 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
238 G1YoungSurvRateNumRegionsSummary)), | |
239 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 240 G1YoungSurvRateNumRegionsSummary)), |
342 | 241 // add here any more surv rate groups |
545 | 242 _recorded_survivor_regions(0), |
243 _recorded_survivor_head(NULL), | |
244 _recorded_survivor_tail(NULL), | |
1356 | 245 _survivors_age_table(true), |
246 | |
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247 _gc_overhead_perc(0.0) { |
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248 |
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249 // Set up the region size and associated fields. Given that the |
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250 // policy is created before the heap, we have to set this up here, |
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251 // so it's done as soon as possible. |
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252 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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253 HeapRegionRemSet::setup_remset_size(); |
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254 |
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255 G1ErgoVerbose::initialize(); |
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256 if (PrintAdaptiveSizePolicy) { |
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257 // Currently, we only use a single switch for all the heuristics. |
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258 G1ErgoVerbose::set_enabled(true); |
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259 // Given that we don't currently have a verboseness level |
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260 // parameter, we'll hardcode this to high. This can be easily |
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261 // changed in the future. |
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262 G1ErgoVerbose::set_level(ErgoHigh); |
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263 } else { |
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264 G1ErgoVerbose::set_enabled(false); |
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265 } |
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266 |
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267 // Verify PLAB sizes |
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268 const size_t region_size = HeapRegion::GrainWords; |
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269 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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270 char buffer[128]; |
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271 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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272 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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273 vm_exit_during_initialization(buffer); |
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274 } |
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275 |
342 | 276 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
277 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
278 | |
1611 | 279 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 280 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
281 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
282 | |
283 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
284 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
285 | |
286 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
287 | |
288 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
289 | |
290 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 291 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
292 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 293 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
4023 | 294 _par_last_gc_worker_other_times_ms = new double[_parallel_gc_threads]; |
342 | 295 |
296 // start conservatively | |
751 | 297 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 298 |
299 int index; | |
300 if (ParallelGCThreads == 0) | |
301 index = 0; | |
302 else if (ParallelGCThreads > 8) | |
303 index = 7; | |
304 else | |
305 index = ParallelGCThreads - 1; | |
306 | |
307 _pending_card_diff_seq->add(0.0); | |
308 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
309 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
310 _fully_young_cards_per_entry_ratio_seq->add( | |
311 fully_young_cards_per_entry_ratio_defaults[index]); | |
312 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
313 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
314 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
315 _young_other_cost_per_region_ms_seq->add( | |
316 young_other_cost_per_region_ms_defaults[index]); | |
317 _non_young_other_cost_per_region_ms_seq->add( | |
318 non_young_other_cost_per_region_ms_defaults[index]); | |
319 | |
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320 // Below, we might need to calculate the pause time target based on |
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321 // the pause interval. When we do so we are going to give G1 maximum |
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322 // flexibility and allow it to do pauses when it needs to. So, we'll |
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323 // arrange that the pause interval to be pause time target + 1 to |
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324 // ensure that a) the pause time target is maximized with respect to |
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325 // the pause interval and b) we maintain the invariant that pause |
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326 // time target < pause interval. If the user does not want this |
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327 // maximum flexibility, they will have to set the pause interval |
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328 // explicitly. |
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329 |
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330 // First make sure that, if either parameter is set, its value is |
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331 // reasonable. |
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332 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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333 if (MaxGCPauseMillis < 1) { |
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334 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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335 "greater than 0"); |
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336 } |
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337 } |
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338 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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339 if (GCPauseIntervalMillis < 1) { |
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340 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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341 "greater than 0"); |
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342 } |
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343 } |
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344 |
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345 // Then, if the pause time target parameter was not set, set it to |
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346 // the default value. |
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347 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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348 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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349 // The default pause time target in G1 is 200ms |
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350 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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351 } else { |
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352 // We do not allow the pause interval to be set without the |
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353 // pause time target |
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354 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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355 "without setting MaxGCPauseMillis"); |
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356 } |
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357 } |
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358 |
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359 // Then, if the interval parameter was not set, set it according to |
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360 // the pause time target (this will also deal with the case when the |
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361 // pause time target is the default value). |
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362 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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363 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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364 } |
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365 |
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366 // Finally, make sure that the two parameters are consistent. |
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367 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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368 char buffer[256]; |
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369 jio_snprintf(buffer, 256, |
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370 "MaxGCPauseMillis (%u) should be less than " |
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371 "GCPauseIntervalMillis (%u)", |
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372 MaxGCPauseMillis, GCPauseIntervalMillis); |
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373 vm_exit_during_initialization(buffer); |
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374 } |
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375 |
751 | 376 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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377 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 378 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 379 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 380 |
381 // start conservatively (around 50ms is about right) | |
382 _concurrent_mark_remark_times_ms->add(0.05); | |
383 _concurrent_mark_cleanup_times_ms->add(0.20); | |
384 _tenuring_threshold = MaxTenuringThreshold; | |
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385 // _max_survivor_regions will be calculated by |
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386 // update_young_list_target_length() during initialization. |
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387 _max_survivor_regions = 0; |
545 | 388 |
1356 | 389 assert(GCTimeRatio > 0, |
390 "we should have set it to a default value set_g1_gc_flags() " | |
391 "if a user set it to 0"); | |
392 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
393 | |
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394 uintx reserve_perc = G1ReservePercent; |
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395 // Put an artificial ceiling on this so that it's not set to a silly value. |
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396 if (reserve_perc > 50) { |
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397 reserve_perc = 50; |
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398 warning("G1ReservePercent is set to a value that is too large, " |
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399 "it's been updated to %u", reserve_perc); |
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400 } |
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401 _reserve_factor = (double) reserve_perc / 100.0; |
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402 // This will be set when the heap is expanded |
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403 // for the first time during initialization. |
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404 _reserve_regions = 0; |
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405 |
342 | 406 initialize_all(); |
4013 | 407 _collectionSetChooser = new CollectionSetChooser(); |
342 | 408 } |
409 | |
410 // Increment "i", mod "len" | |
411 static void inc_mod(int& i, int len) { | |
412 i++; if (i == len) i = 0; | |
413 } | |
414 | |
415 void G1CollectorPolicy::initialize_flags() { | |
416 set_min_alignment(HeapRegion::GrainBytes); | |
417 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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418 if (SurvivorRatio < 1) { |
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419 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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420 } |
342 | 421 CollectorPolicy::initialize_flags(); |
422 } | |
423 | |
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424 // The easiest way to deal with the parsing of the NewSize / |
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425 // MaxNewSize / etc. parameteres is to re-use the code in the |
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426 // TwoGenerationCollectorPolicy class. This is similar to what |
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427 // ParallelScavenge does with its GenerationSizer class (see |
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428 // ParallelScavengeHeap::initialize()). We might change this in the |
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429 // future, but it's a good start. |
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430 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
3976 | 431 private: |
432 size_t size_to_region_num(size_t byte_size) { | |
433 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); | |
434 } | |
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435 |
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436 public: |
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437 G1YoungGenSizer() { |
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438 initialize_flags(); |
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439 initialize_size_info(); |
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440 } |
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441 size_t min_young_region_num() { |
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442 return size_to_region_num(_min_gen0_size); |
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443 } |
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444 size_t initial_young_region_num() { |
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445 return size_to_region_num(_initial_gen0_size); |
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446 } |
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447 size_t max_young_region_num() { |
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448 return size_to_region_num(_max_gen0_size); |
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449 } |
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450 }; |
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451 |
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452 void G1CollectorPolicy::update_young_list_size_using_newratio(size_t number_of_heap_regions) { |
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453 assert(number_of_heap_regions > 0, "Heap must be initialized"); |
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454 size_t young_size = number_of_heap_regions / (NewRatio + 1); |
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455 _min_desired_young_length = young_size; |
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456 _max_desired_young_length = young_size; |
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457 } |
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458 |
342 | 459 void G1CollectorPolicy::init() { |
460 // Set aside an initial future to_space. | |
461 _g1 = G1CollectedHeap::heap(); | |
462 | |
463 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
464 | |
545 | 465 initialize_gc_policy_counters(); |
466 | |
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467 G1YoungGenSizer sizer; |
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468 _min_desired_young_length = sizer.min_young_region_num(); |
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469 _max_desired_young_length = sizer.max_young_region_num(); |
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470 |
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471 if (FLAG_IS_CMDLINE(NewRatio)) { |
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472 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
3976 | 473 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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474 } else { |
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475 // Treat NewRatio as a fixed size that is only recalculated when the heap size changes |
3976 | 476 update_young_list_size_using_newratio(_g1->n_regions()); |
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477 _using_new_ratio_calculations = true; |
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478 } |
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479 } |
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480 |
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481 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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482 |
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483 set_adaptive_young_list_length(_min_desired_young_length < _max_desired_young_length); |
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484 if (adaptive_young_list_length()) { |
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485 _young_list_fixed_length = 0; |
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486 } else { |
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487 assert(_min_desired_young_length == _max_desired_young_length, "Min and max young size differ"); |
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488 _young_list_fixed_length = _min_desired_young_length; |
342 | 489 } |
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490 _free_regions_at_end_of_collection = _g1->free_regions(); |
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491 update_young_list_target_length(); |
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492 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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493 |
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494 // We may immediately start allocating regions and placing them on the |
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495 // collection set list. Initialize the per-collection set info |
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496 start_incremental_cset_building(); |
342 | 497 } |
498 | |
545 | 499 // Create the jstat counters for the policy. |
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500 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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501 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 502 } |
503 | |
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504 bool G1CollectorPolicy::predict_will_fit(size_t young_length, |
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505 double base_time_ms, |
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506 size_t base_free_regions, |
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507 double target_pause_time_ms) { |
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508 if (young_length >= base_free_regions) { |
342 | 509 // end condition 1: not enough space for the young regions |
510 return false; | |
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511 } |
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512 |
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513 double accum_surv_rate = accum_yg_surv_rate_pred((int)(young_length - 1)); |
342 | 514 size_t bytes_to_copy = |
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515 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 516 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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517 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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518 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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519 if (pause_time_ms > target_pause_time_ms) { |
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520 // end condition 2: prediction is over the target pause time |
342 | 521 return false; |
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522 } |
342 | 523 |
524 size_t free_bytes = | |
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525 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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526 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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527 // end condition 3: out-of-space (conservatively!) |
342 | 528 return false; |
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529 } |
342 | 530 |
531 // success! | |
532 return true; | |
533 } | |
534 | |
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535 void G1CollectorPolicy::record_new_heap_size(size_t new_number_of_regions) { |
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536 // re-calculate the necessary reserve |
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537 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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538 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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539 // smaller than 1.0) we'll get 1. |
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540 _reserve_regions = (size_t) ceil(reserve_regions_d); |
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541 |
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542 if (_using_new_ratio_calculations) { |
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543 // -XX:NewRatio was specified so we need to update the |
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544 // young gen length when the heap size has changed. |
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545 update_young_list_size_using_newratio(new_number_of_regions); |
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546 } |
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547 } |
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548 |
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549 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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550 size_t base_min_length) { |
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551 size_t desired_min_length = 0; |
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552 if (adaptive_young_list_length()) { |
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553 if (_alloc_rate_ms_seq->num() > 3) { |
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554 double now_sec = os::elapsedTime(); |
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555 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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556 double alloc_rate_ms = predict_alloc_rate_ms(); |
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557 desired_min_length = (size_t) ceil(alloc_rate_ms * when_ms); |
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558 } else { |
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559 // otherwise we don't have enough info to make the prediction |
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560 } |
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561 } |
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562 desired_min_length += base_min_length; |
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563 // make sure we don't go below any user-defined minimum bound |
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564 return MAX2(_min_desired_young_length, desired_min_length); |
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565 } |
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566 |
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567 size_t G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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568 // Here, we might want to also take into account any additional |
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569 // constraints (i.e., user-defined minimum bound). Currently, we |
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570 // effectively don't set this bound. |
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571 return _max_desired_young_length; |
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572 } |
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573 |
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574 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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575 if (rs_lengths == (size_t) -1) { |
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576 // if it's set to the default value (-1), we should predict it; |
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577 // otherwise, use the given value. |
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578 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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579 } |
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580 |
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581 // Calculate the absolute and desired min bounds. |
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582 |
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583 // This is how many young regions we already have (currently: the survivors). |
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584 size_t base_min_length = recorded_survivor_regions(); |
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585 // This is the absolute minimum young length, which ensures that we |
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586 // can allocate one eden region in the worst-case. |
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587 size_t absolute_min_length = base_min_length + 1; |
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588 size_t desired_min_length = |
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589 calculate_young_list_desired_min_length(base_min_length); |
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590 if (desired_min_length < absolute_min_length) { |
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591 desired_min_length = absolute_min_length; |
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592 } |
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593 |
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594 // Calculate the absolute and desired max bounds. |
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595 |
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596 // We will try our best not to "eat" into the reserve. |
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597 size_t absolute_max_length = 0; |
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598 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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599 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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600 } |
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601 size_t desired_max_length = calculate_young_list_desired_max_length(); |
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602 if (desired_max_length > absolute_max_length) { |
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603 desired_max_length = absolute_max_length; |
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604 } |
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605 |
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606 size_t young_list_target_length = 0; |
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607 if (adaptive_young_list_length()) { |
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608 if (full_young_gcs()) { |
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609 young_list_target_length = |
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610 calculate_young_list_target_length(rs_lengths, |
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611 base_min_length, |
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612 desired_min_length, |
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613 desired_max_length); |
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614 _rs_lengths_prediction = rs_lengths; |
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615 } else { |
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616 // Don't calculate anything and let the code below bound it to |
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617 // the desired_min_length, i.e., do the next GC as soon as |
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618 // possible to maximize how many old regions we can add to it. |
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619 } |
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620 } else { |
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621 if (full_young_gcs()) { |
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622 young_list_target_length = _young_list_fixed_length; |
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623 } else { |
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624 // A bit arbitrary: during partially-young GCs we allocate half |
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625 // the young regions to try to add old regions to the CSet. |
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626 young_list_target_length = _young_list_fixed_length / 2; |
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627 // We choose to accept that we might go under the desired min |
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628 // length given that we intentionally ask for a smaller young gen. |
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629 desired_min_length = absolute_min_length; |
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630 } |
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631 } |
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632 |
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633 // Make sure we don't go over the desired max length, nor under the |
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634 // desired min length. In case they clash, desired_min_length wins |
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635 // which is why that test is second. |
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636 if (young_list_target_length > desired_max_length) { |
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637 young_list_target_length = desired_max_length; |
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638 } |
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639 if (young_list_target_length < desired_min_length) { |
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640 young_list_target_length = desired_min_length; |
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641 } |
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642 |
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643 assert(young_list_target_length > recorded_survivor_regions(), |
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644 "we should be able to allocate at least one eden region"); |
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645 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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646 _young_list_target_length = young_list_target_length; |
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647 |
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648 update_max_gc_locker_expansion(); |
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649 } |
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650 |
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651 size_t |
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652 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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653 size_t base_min_length, |
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654 size_t desired_min_length, |
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655 size_t desired_max_length) { |
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656 assert(adaptive_young_list_length(), "pre-condition"); |
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657 assert(full_young_gcs(), "only call this for fully-young GCs"); |
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658 |
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659 // In case some edge-condition makes the desired max length too small... |
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660 if (desired_max_length <= desired_min_length) { |
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661 return desired_min_length; |
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662 } |
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663 |
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664 // We'll adjust min_young_length and max_young_length not to include |
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665 // the already allocated young regions (i.e., so they reflect the |
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666 // min and max eden regions we'll allocate). The base_min_length |
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667 // will be reflected in the predictions by the |
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668 // survivor_regions_evac_time prediction. |
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669 assert(desired_min_length > base_min_length, "invariant"); |
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670 size_t min_young_length = desired_min_length - base_min_length; |
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671 assert(desired_max_length > base_min_length, "invariant"); |
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672 size_t max_young_length = desired_max_length - base_min_length; |
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673 |
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674 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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675 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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676 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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677 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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678 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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679 double base_time_ms = |
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680 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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681 survivor_regions_evac_time; |
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682 size_t available_free_regions = _free_regions_at_end_of_collection; |
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683 size_t base_free_regions = 0; |
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684 if (available_free_regions > _reserve_regions) { |
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685 base_free_regions = available_free_regions - _reserve_regions; |
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686 } |
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687 |
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688 // Here, we will make sure that the shortest young length that |
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689 // makes sense fits within the target pause time. |
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690 |
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691 if (predict_will_fit(min_young_length, base_time_ms, |
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692 base_free_regions, target_pause_time_ms)) { |
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693 // The shortest young length will fit into the target pause time; |
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694 // we'll now check whether the absolute maximum number of young |
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695 // regions will fit in the target pause time. If not, we'll do |
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696 // a binary search between min_young_length and max_young_length. |
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697 if (predict_will_fit(max_young_length, base_time_ms, |
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698 base_free_regions, target_pause_time_ms)) { |
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699 // The maximum young length will fit into the target pause time. |
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700 // We are done so set min young length to the maximum length (as |
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701 // the result is assumed to be returned in min_young_length). |
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702 min_young_length = max_young_length; |
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703 } else { |
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704 // The maximum possible number of young regions will not fit within |
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705 // the target pause time so we'll search for the optimal |
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706 // length. The loop invariants are: |
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707 // |
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708 // min_young_length < max_young_length |
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709 // min_young_length is known to fit into the target pause time |
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710 // max_young_length is known not to fit into the target pause time |
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711 // |
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712 // Going into the loop we know the above hold as we've just |
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713 // checked them. Every time around the loop we check whether |
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714 // the middle value between min_young_length and |
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715 // max_young_length fits into the target pause time. If it |
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716 // does, it becomes the new min. If it doesn't, it becomes |
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717 // the new max. This way we maintain the loop invariants. |
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718 |
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719 assert(min_young_length < max_young_length, "invariant"); |
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720 size_t diff = (max_young_length - min_young_length) / 2; |
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721 while (diff > 0) { |
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722 size_t young_length = min_young_length + diff; |
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723 if (predict_will_fit(young_length, base_time_ms, |
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724 base_free_regions, target_pause_time_ms)) { |
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725 min_young_length = young_length; |
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726 } else { |
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727 max_young_length = young_length; |
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728 } |
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729 assert(min_young_length < max_young_length, "invariant"); |
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730 diff = (max_young_length - min_young_length) / 2; |
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731 } |
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732 // The results is min_young_length which, according to the |
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733 // loop invariants, should fit within the target pause time. |
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734 |
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735 // These are the post-conditions of the binary search above: |
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736 assert(min_young_length < max_young_length, |
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737 "otherwise we should have discovered that max_young_length " |
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738 "fits into the pause target and not done the binary search"); |
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739 assert(predict_will_fit(min_young_length, base_time_ms, |
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740 base_free_regions, target_pause_time_ms), |
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741 "min_young_length, the result of the binary search, should " |
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742 "fit into the pause target"); |
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743 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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744 base_free_regions, target_pause_time_ms), |
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745 "min_young_length, the result of the binary search, should be " |
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746 "optimal, so no larger length should fit into the pause target"); |
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747 } |
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748 } else { |
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749 // Even the minimum length doesn't fit into the pause time |
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750 // target, return it as the result nevertheless. |
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751 } |
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752 return base_min_length + min_young_length; |
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753 } |
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754 |
545 | 755 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
756 double survivor_regions_evac_time = 0.0; | |
757 for (HeapRegion * r = _recorded_survivor_head; | |
758 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
759 r = r->get_next_young_region()) { | |
760 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
761 } | |
762 return survivor_regions_evac_time; | |
763 } | |
764 | |
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765 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 766 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
767 | |
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768 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 769 if (rs_lengths > _rs_lengths_prediction) { |
770 // add 10% to avoid having to recalculate often | |
771 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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772 update_young_list_target_length(rs_lengths_prediction); |
342 | 773 } |
774 } | |
775 | |
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776 |
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777 |
342 | 778 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
779 bool is_tlab, | |
780 bool* gc_overhead_limit_was_exceeded) { | |
781 guarantee(false, "Not using this policy feature yet."); | |
782 return NULL; | |
783 } | |
784 | |
785 // This method controls how a collector handles one or more | |
786 // of its generations being fully allocated. | |
787 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
788 bool is_tlab) { | |
789 guarantee(false, "Not using this policy feature yet."); | |
790 return NULL; | |
791 } | |
792 | |
793 | |
794 #ifndef PRODUCT | |
795 bool G1CollectorPolicy::verify_young_ages() { | |
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796 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 797 return |
798 verify_young_ages(head, _short_lived_surv_rate_group); | |
799 // also call verify_young_ages on any additional surv rate groups | |
800 } | |
801 | |
802 bool | |
803 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
804 SurvRateGroup *surv_rate_group) { | |
805 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
806 | |
807 const char* name = surv_rate_group->name(); | |
808 bool ret = true; | |
809 int prev_age = -1; | |
810 | |
811 for (HeapRegion* curr = head; | |
812 curr != NULL; | |
813 curr = curr->get_next_young_region()) { | |
814 SurvRateGroup* group = curr->surv_rate_group(); | |
815 if (group == NULL && !curr->is_survivor()) { | |
816 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
817 ret = false; | |
818 } | |
819 | |
820 if (surv_rate_group == group) { | |
821 int age = curr->age_in_surv_rate_group(); | |
822 | |
823 if (age < 0) { | |
824 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
825 ret = false; | |
826 } | |
827 | |
828 if (age <= prev_age) { | |
829 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
830 "(%d, %d)", name, age, prev_age); | |
831 ret = false; | |
832 } | |
833 prev_age = age; | |
834 } | |
835 } | |
836 | |
837 return ret; | |
838 } | |
839 #endif // PRODUCT | |
840 | |
841 void G1CollectorPolicy::record_full_collection_start() { | |
842 _cur_collection_start_sec = os::elapsedTime(); | |
843 // Release the future to-space so that it is available for compaction into. | |
844 _g1->set_full_collection(); | |
845 } | |
846 | |
847 void G1CollectorPolicy::record_full_collection_end() { | |
848 // Consider this like a collection pause for the purposes of allocation | |
849 // since last pause. | |
850 double end_sec = os::elapsedTime(); | |
851 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
852 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
853 | |
854 _all_full_gc_times_ms->add(full_gc_time_ms); | |
855 | |
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856 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 857 |
858 _g1->clear_full_collection(); | |
859 | |
860 // "Nuke" the heuristics that control the fully/partially young GC | |
861 // transitions and make sure we start with fully young GCs after the | |
862 // Full GC. | |
863 set_full_young_gcs(true); | |
864 _last_full_young_gc = false; | |
865 _should_revert_to_full_young_gcs = false; | |
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866 clear_initiate_conc_mark_if_possible(); |
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867 clear_during_initial_mark_pause(); |
342 | 868 _known_garbage_bytes = 0; |
869 _known_garbage_ratio = 0.0; | |
870 _in_marking_window = false; | |
871 _in_marking_window_im = false; | |
872 | |
873 _short_lived_surv_rate_group->start_adding_regions(); | |
874 // also call this on any additional surv rate groups | |
875 | |
545 | 876 record_survivor_regions(0, NULL, NULL); |
877 | |
342 | 878 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 879 // Reset survivors SurvRateGroup. |
880 _survivor_surv_rate_group->reset(); | |
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881 update_young_list_target_length(); |
4013 | 882 _collectionSetChooser->updateAfterFullCollection(); |
1973 | 883 } |
342 | 884 |
885 void G1CollectorPolicy::record_stop_world_start() { | |
886 _stop_world_start = os::elapsedTime(); | |
887 } | |
888 | |
889 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
890 size_t start_used) { | |
891 if (PrintGCDetails) { | |
892 gclog_or_tty->stamp(PrintGCTimeStamps); | |
893 gclog_or_tty->print("[GC pause"); | |
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894 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
342 | 895 } |
896 | |
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897 // We only need to do this here as the policy will only be applied |
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898 // to the GC we're about to start. so, no point is calculating this |
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899 // every time we calculate / recalculate the target young length. |
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900 update_survivors_policy(); |
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901 |
1973 | 902 assert(_g1->used() == _g1->recalculate_used(), |
903 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
904 _g1->used(), _g1->recalculate_used())); | |
342 | 905 |
906 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
907 _all_stop_world_times_ms->add(s_w_t_ms); | |
908 _stop_world_start = 0.0; | |
909 | |
910 _cur_collection_start_sec = start_time_sec; | |
911 _cur_collection_pause_used_at_start_bytes = start_used; | |
912 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
913 _pending_cards = _g1->pending_card_num(); | |
914 _max_pending_cards = _g1->max_pending_card_num(); | |
915 | |
916 _bytes_in_collection_set_before_gc = 0; | |
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917 _bytes_copied_during_gc = 0; |
342 | 918 |
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919 YoungList* young_list = _g1->young_list(); |
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920 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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921 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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922 _capacity_before_gc = _g1->capacity(); |
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923 |
342 | 924 #ifdef DEBUG |
925 // initialise these to something well known so that we can spot | |
926 // if they are not set properly | |
927 | |
928 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 929 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
930 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
931 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
932 _par_last_update_rs_times_ms[i] = -1234.0; | |
933 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
934 _par_last_scan_rs_times_ms[i] = -1234.0; | |
935 _par_last_obj_copy_times_ms[i] = -1234.0; | |
936 _par_last_termination_times_ms[i] = -1234.0; | |
937 _par_last_termination_attempts[i] = -1234.0; | |
938 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 939 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 940 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 941 } |
942 #endif | |
943 | |
944 for (int i = 0; i < _aux_num; ++i) { | |
945 _cur_aux_times_ms[i] = 0.0; | |
946 _cur_aux_times_set[i] = false; | |
947 } | |
948 | |
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949 // This is initialized to zero here and is set during |
4023 | 950 // the evacuation pause if marking is in progress. |
951 _cur_satb_drain_time_ms = 0.0; | |
342 | 952 |
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953 _last_young_gc_full = false; |
342 | 954 |
955 // do that for any other surv rate groups | |
956 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 957 _survivors_age_table.clear(); |
545 | 958 |
342 | 959 assert( verify_young_ages(), "region age verification" ); |
960 } | |
961 | |
962 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
963 _mark_closure_time_ms = mark_closure_time_ms; | |
964 } | |
965 | |
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966 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 967 mark_init_elapsed_time_ms) { |
968 _during_marking = true; | |
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969 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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970 clear_during_initial_mark_pause(); |
342 | 971 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
972 } | |
973 | |
974 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
975 _mark_remark_start_sec = os::elapsedTime(); | |
976 _during_marking = false; | |
977 } | |
978 | |
979 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
980 double end_time_sec = os::elapsedTime(); | |
981 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
982 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
983 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
984 _prev_collection_pause_end_ms += elapsed_time_ms; | |
985 | |
986 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
987 } | |
988 | |
989 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
990 _mark_cleanup_start_sec = os::elapsedTime(); | |
991 } | |
992 | |
4013 | 993 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
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994 _should_revert_to_full_young_gcs = false; |
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995 _last_full_young_gc = true; |
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996 _in_marking_window = false; |
342 | 997 } |
998 | |
999 void G1CollectorPolicy::record_concurrent_pause() { | |
1000 if (_stop_world_start > 0.0) { | |
1001 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1002 _all_yield_times_ms->add(yield_ms); | |
1003 } | |
1004 } | |
1005 | |
1006 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1007 } | |
1008 | |
1009 template<class T> | |
1010 T sum_of(T* sum_arr, int start, int n, int N) { | |
1011 T sum = (T)0; | |
1012 for (int i = 0; i < n; i++) { | |
1013 int j = (start + i) % N; | |
1014 sum += sum_arr[j]; | |
1015 } | |
1016 return sum; | |
1017 } | |
1018 | |
1611 | 1019 void G1CollectorPolicy::print_par_stats(int level, |
1020 const char* str, | |
2430 | 1021 double* data) { |
342 | 1022 double min = data[0], max = data[0]; |
1023 double total = 0.0; | |
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1024 LineBuffer buf(level); |
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1025 buf.append("[%s (ms):", str); |
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1026 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1027 double val = data[i]; |
1028 if (val < min) | |
1029 min = val; | |
1030 if (val > max) | |
1031 max = val; | |
1032 total += val; | |
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1033 buf.append(" %3.1lf", val); |
342 | 1034 } |
2430 | 1035 buf.append_and_print_cr(""); |
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1036 double avg = total / (double) no_of_gc_threads(); |
2430 | 1037 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", |
1038 avg, min, max, max - min); | |
342 | 1039 } |
1040 | |
1611 | 1041 void G1CollectorPolicy::print_par_sizes(int level, |
1042 const char* str, | |
2430 | 1043 double* data) { |
342 | 1044 double min = data[0], max = data[0]; |
1045 double total = 0.0; | |
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1046 LineBuffer buf(level); |
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1047 buf.append("[%s :", str); |
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1048 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1049 double val = data[i]; |
1050 if (val < min) | |
1051 min = val; | |
1052 if (val > max) | |
1053 max = val; | |
1054 total += val; | |
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1055 buf.append(" %d", (int) val); |
342 | 1056 } |
2430 | 1057 buf.append_and_print_cr(""); |
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1058 double avg = total / (double) no_of_gc_threads(); |
2430 | 1059 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", |
1060 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1061 } |
1062 | |
4023 | 1063 void G1CollectorPolicy::print_stats(int level, |
1064 const char* str, | |
1065 double value) { | |
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1066 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1067 } |
1068 | |
4023 | 1069 void G1CollectorPolicy::print_stats(int level, |
1070 const char* str, | |
1071 int value) { | |
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1072 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1073 } |
1074 | |
4023 | 1075 double G1CollectorPolicy::avg_value(double* data) { |
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1076 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1077 double ret = 0.0; |
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1078 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1079 ret += data[i]; |
4023 | 1080 } |
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1081 return ret / (double) no_of_gc_threads(); |
342 | 1082 } else { |
1083 return data[0]; | |
1084 } | |
1085 } | |
1086 | |
4023 | 1087 double G1CollectorPolicy::max_value(double* data) { |
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1088 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1089 double ret = data[0]; |
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1090 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
4023 | 1091 if (data[i] > ret) { |
342 | 1092 ret = data[i]; |
4023 | 1093 } |
1094 } | |
342 | 1095 return ret; |
1096 } else { | |
1097 return data[0]; | |
1098 } | |
1099 } | |
1100 | |
4023 | 1101 double G1CollectorPolicy::sum_of_values(double* data) { |
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1102 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1103 double sum = 0.0; |
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1104 for (uint i = 0; i < no_of_gc_threads(); i++) { |
342 | 1105 sum += data[i]; |
4023 | 1106 } |
342 | 1107 return sum; |
1108 } else { | |
1109 return data[0]; | |
1110 } | |
1111 } | |
1112 | |
4023 | 1113 double G1CollectorPolicy::max_sum(double* data1, double* data2) { |
342 | 1114 double ret = data1[0] + data2[0]; |
1115 | |
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1116 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1117 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
342 | 1118 double data = data1[i] + data2[i]; |
4023 | 1119 if (data > ret) { |
342 | 1120 ret = data; |
4023 | 1121 } |
342 | 1122 } |
1123 } | |
1124 return ret; | |
1125 } | |
1126 | |
1127 // Anything below that is considered to be zero | |
1128 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1129 | |
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1130 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1131 double end_time_sec = os::elapsedTime(); |
1132 double elapsed_ms = _last_pause_time_ms; | |
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1133 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
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1134 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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1135 "otherwise, the subtraction below does not make sense"); |
342 | 1136 size_t rs_size = |
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1137 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1138 size_t cur_used_bytes = _g1->used(); |
1139 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1140 bool last_pause_included_initial_mark = false; | |
1707 | 1141 bool update_stats = !_g1->evacuation_failed(); |
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1142 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1143 |
1144 #ifndef PRODUCT | |
1145 if (G1YoungSurvRateVerbose) { | |
1146 gclog_or_tty->print_cr(""); | |
1147 _short_lived_surv_rate_group->print(); | |
1148 // do that for any other surv rate groups too | |
1149 } | |
1150 #endif // PRODUCT | |
1151 | |
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1152 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1153 if (last_pause_included_initial_mark) |
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1154 record_concurrent_mark_init_end(0.0); |
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1155 |
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1156 size_t marking_initiating_used_threshold = |
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1157 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1158 |
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1159 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1160 assert(!last_pause_included_initial_mark, "invariant"); |
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1161 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1162 if (cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1163 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1164 |
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1165 ergo_verbose3(ErgoConcCycles, |
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1166 "request concurrent cycle initiation", |
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1167 ergo_format_reason("occupancy higher than threshold") |
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1168 ergo_format_byte("occupancy") |
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1169 ergo_format_byte_perc("threshold"), |
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1170 cur_used_bytes, |
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1171 marking_initiating_used_threshold, |
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1172 (double) InitiatingHeapOccupancyPercent); |
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1173 |
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1174 // Note: this might have already been set, if during the last |
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1175 // pause we decided to start a cycle but at the beginning of |
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1176 // this pause we decided to postpone it. That's OK. |
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1177 set_initiate_conc_mark_if_possible(); |
3914
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1178 } else { |
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1179 ergo_verbose2(ErgoConcCycles, |
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1180 "do not request concurrent cycle initiation", |
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1181 ergo_format_reason("occupancy lower than previous occupancy") |
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1182 ergo_format_byte("occupancy") |
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1183 ergo_format_byte("previous occupancy"), |
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1184 cur_used_bytes, |
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1185 _prev_collection_pause_used_at_end_bytes); |
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1186 } |
342 | 1187 } |
1188 } | |
1189 | |
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1190 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1191 |
342 | 1192 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1193 end_time_sec, false); | |
1194 | |
1195 // This assert is exempted when we're doing parallel collection pauses, | |
1196 // because the fragmentation caused by the parallel GC allocation buffers | |
1197 // can lead to more memory being used during collection than was used | |
1198 // before. Best leave this out until the fragmentation problem is fixed. | |
1199 // Pauses in which evacuation failed can also lead to negative | |
1200 // collections, since no space is reclaimed from a region containing an | |
1201 // object whose evacuation failed. | |
1202 // Further, we're now always doing parallel collection. But I'm still | |
1203 // leaving this here as a placeholder for a more precise assertion later. | |
1204 // (DLD, 10/05.) | |
1205 assert((true || parallel) // Always using GC LABs now. | |
1206 || _g1->evacuation_failed() | |
1207 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1208 "Negative collection"); | |
1209 | |
1210 size_t freed_bytes = | |
1211 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1212 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1213 |
342 | 1214 double survival_fraction = |
1215 (double)surviving_bytes/ | |
1216 (double)_collection_set_bytes_used_before; | |
1217 | |
4023 | 1218 // These values are used to update the summary information that is |
1219 // displayed when TraceGen0Time is enabled, and are output as part | |
1220 // of the PrintGCDetails output, in the non-parallel case. | |
1221 | |
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1222 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1223 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1224 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1225 double update_rs_processed_buffers = |
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1226 sum_of_values(_par_last_update_rs_processed_buffers); |
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1227 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1228 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1229 double termination_time = avg_value(_par_last_termination_times_ms); |
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1230 |
4023 | 1231 double known_time = ext_root_scan_time + |
1232 mark_stack_scan_time + | |
1233 update_rs_time + | |
1234 scan_rs_time + | |
1235 obj_copy_time; | |
1236 | |
1237 double other_time_ms = elapsed_ms; | |
1238 | |
1239 // Subtract the SATB drain time. It's initialized to zero at the | |
1240 // start of the pause and is updated during the pause if marking | |
1241 // is in progress. | |
1242 other_time_ms -= _cur_satb_drain_time_ms; | |
1243 | |
1244 if (parallel) { | |
1245 other_time_ms -= _cur_collection_par_time_ms; | |
1246 } else { | |
1247 other_time_ms -= known_time; | |
1248 } | |
1249 | |
1250 // Subtract the time taken to clean the card table from the | |
1251 // current value of "other time" | |
1252 other_time_ms -= _cur_clear_ct_time_ms; | |
1253 | |
1254 // TraceGen0Time and TraceGen1Time summary info updating. | |
1255 _all_pause_times_ms->add(elapsed_ms); | |
3823
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1256 |
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1257 if (update_stats) { |
4023 | 1258 _summary->record_total_time_ms(elapsed_ms); |
1259 _summary->record_other_time_ms(other_time_ms); | |
1260 | |
1261 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1262 assert(body_summary != NULL, "should not be null!"); | |
1263 | |
1264 // This will be non-zero iff marking is currently in progress (i.e. | |
1265 // _g1->mark_in_progress() == true) and the currrent pause was not | |
1266 // an initial mark pause. Since the body_summary items are NumberSeqs, | |
1267 // however, they have to be consistent and updated in lock-step with | |
1268 // each other. Therefore we unconditionally record the SATB drain | |
1269 // time - even if it's zero. | |
1270 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
3823
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1271 |
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1272 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1273 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1274 body_summary->record_update_rs_time_ms(update_rs_time); |
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1275 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1276 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1277 |
3823
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1278 if (parallel) { |
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1279 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1280 body_summary->record_termination_time_ms(termination_time); |
4023 | 1281 |
1282 double parallel_known_time = known_time + termination_time; | |
1283 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
3823
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1284 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1285 } |
4023 | 1286 |
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1287 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
4023 | 1288 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
3823
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1289 |
342 | 1290 // We exempt parallel collection from this check because Alloc Buffer |
1291 // fragmentation can produce negative collections. Same with evac | |
1292 // failure. | |
1293 // Further, we're now always doing parallel collection. But I'm still | |
1294 // leaving this here as a placeholder for a more precise assertion later. | |
1295 // (DLD, 10/05. | |
1296 assert((true || parallel) | |
1297 || _g1->evacuation_failed() | |
1298 || surviving_bytes <= _collection_set_bytes_used_before, | |
1299 "Or else negative collection!"); | |
4023 | 1300 |
342 | 1301 // this is where we update the allocation rate of the application |
1302 double app_time_ms = | |
1303 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1304 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1305 // This usually happens due to the timer not having the required | |
1306 // granularity. Some Linuxes are the usual culprits. | |
1307 // We'll just set it to something (arbitrarily) small. | |
1308 app_time_ms = 1.0; | |
1309 } | |
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1310 // We maintain the invariant that all objects allocated by mutator |
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1311 // threads will be allocated out of eden regions. So, we can use |
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1312 // the eden region number allocated since the previous GC to |
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1313 // calculate the application's allocate rate. The only exception |
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1314 // to that is humongous objects that are allocated separately. But |
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1315 // given that humongous object allocations do not really affect |
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1316 // either the pause's duration nor when the next pause will take |
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1317 // place we can safely ignore them here. |
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1318 size_t regions_allocated = eden_cset_region_length(); |
342 | 1319 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
1320 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1321 | |
1322 double interval_ms = | |
1323 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1324 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1325 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1326 if (recent_avg_pause_time_ratio() < 0.0 || |
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1327 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1328 #ifndef PRODUCT |
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1329 // Dump info to allow post-facto debugging |
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1330 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1331 gclog_or_tty->print_cr("-------------------------------------------"); |
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1332 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1333 _recent_gc_times_ms->dump(); |
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1334 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1335 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1336 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1337 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
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1338 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1339 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1340 #endif // !PRODUCT |
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1341 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1342 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1343 if (_recent_avg_pause_time_ratio < 0.0) { |
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1344 _recent_avg_pause_time_ratio = 0.0; |
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1345 } else { |
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1346 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1347 _recent_avg_pause_time_ratio = 1.0; |
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1348 } |
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1349 } |
342 | 1350 } |
1351 | |
4023 | 1352 for (int i = 0; i < _aux_num; ++i) { |
1353 if (_cur_aux_times_set[i]) { | |
1354 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1355 } | |
1356 } | |
1357 | |
1358 // PrintGCDetails output | |
342 | 1359 if (PrintGCDetails) { |
4023 | 1360 bool print_marking_info = |
1361 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1362 | |
1707 | 1363 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1364 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1365 elapsed_ms / 1000.0); | |
1366 | |
4023 | 1367 if (print_marking_info) { |
1707 | 1368 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
1369 } | |
4023 | 1370 |
1707 | 1371 if (parallel) { |
1372 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1373 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1374 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1375 if (print_marking_info) { | |
1376 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1377 } | |
1707 | 1378 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1379 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1707 | 1380 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1381 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1382 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1383 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
4023 | 1384 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
2430 | 1385 |
1386 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1387 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
4023 | 1388 |
1389 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
1390 _par_last_mark_stack_scan_times_ms[i] + | |
1391 _par_last_update_rs_times_ms[i] + | |
1392 _par_last_scan_rs_times_ms[i] + | |
1393 _par_last_obj_copy_times_ms[i] + | |
1394 _par_last_termination_times_ms[i]; | |
1395 | |
1396 _par_last_gc_worker_other_times_ms[i] = _cur_collection_par_time_ms - worker_known_time; | |
2430 | 1397 } |
4023 | 1398 print_par_stats(2, "GC Worker", _par_last_gc_worker_times_ms); |
1399 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); | |
1707 | 1400 } else { |
4023 | 1401 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1402 if (print_marking_info) { | |
1403 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1404 } | |
1707 | 1405 print_stats(1, "Update RS", update_rs_time); |
4023 | 1406 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
1707 | 1407 print_stats(1, "Scan RS", scan_rs_time); |
1408 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1409 } |
4023 | 1410 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
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1411 #ifndef PRODUCT |
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1412 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1413 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1414 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1415 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1416 if (_num_cc_clears > 0) { |
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1417 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1418 } |
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1419 #endif |
342 | 1420 print_stats(1, "Other", other_time_ms); |
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1421 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1422 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1423 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1424 |
342 | 1425 for (int i = 0; i < _aux_num; ++i) { |
1426 if (_cur_aux_times_set[i]) { | |
1427 char buffer[96]; | |
1428 sprintf(buffer, "Aux%d", i); | |
1429 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1430 } | |
1431 } | |
1432 } | |
1433 | |
1434 // Update the efficiency-since-mark vars. | |
1435 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1436 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1437 // This usually happens due to the timer not having the required | |
1438 // granularity. Some Linuxes are the usual culprits. | |
1439 // We'll just set it to something (arbitrarily) small. | |
1440 proc_ms = 1.0; | |
1441 } | |
1442 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1443 | |
1444 bool new_in_marking_window = _in_marking_window; | |
1445 bool new_in_marking_window_im = false; | |
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1446 if (during_initial_mark_pause()) { |
342 | 1447 new_in_marking_window = true; |
1448 new_in_marking_window_im = true; | |
1449 } | |
1450 | |
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1451 if (_last_full_young_gc) { |
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1452 if (!last_pause_included_initial_mark) { |
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1453 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1454 "start partially-young GCs", |
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1455 ergo_format_byte_perc("known garbage"), |
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1456 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1457 set_full_young_gcs(false); |
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1458 } else { |
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1459 ergo_verbose0(ErgoPartiallyYoungGCs, |
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1460 "do not start partially-young GCs", |
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1461 ergo_format_reason("concurrent cycle is about to start")); |
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1462 } |
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1463 _last_full_young_gc = false; |
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1464 } |
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1465 |
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1466 if ( !_last_young_gc_full ) { |
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1467 if (_should_revert_to_full_young_gcs) { |
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1468 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1469 "end partially-young GCs", |
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1470 ergo_format_reason("partially-young GCs end requested") |
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1471 ergo_format_byte_perc("known garbage"), |
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1472 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1473 set_full_young_gcs(true); |
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1474 } else if (_known_garbage_ratio < 0.05) { |
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1475 ergo_verbose3(ErgoPartiallyYoungGCs, |
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1476 "end partially-young GCs", |
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1477 ergo_format_reason("known garbage percent lower than threshold") |
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1478 ergo_format_byte_perc("known garbage") |
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1479 ergo_format_perc("threshold"), |
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1480 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
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1481 0.05 * 100.0); |
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1482 set_full_young_gcs(true); |
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1483 } else if (adaptive_young_list_length() && |
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1484 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
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1485 ergo_verbose5(ErgoPartiallyYoungGCs, |
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1486 "end partially-young GCs", |
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1487 ergo_format_reason("current GC efficiency lower than " |
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1488 "predicted fully-young GC efficiency") |
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1489 ergo_format_double("GC efficiency factor") |
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1490 ergo_format_double("current GC efficiency") |
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1491 ergo_format_double("predicted fully-young GC efficiency") |
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1492 ergo_format_byte_perc("known garbage"), |
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1493 get_gc_eff_factor(), cur_efficiency, |
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1494 predict_young_gc_eff(), |
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1495 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1496 set_full_young_gcs(true); |
342 | 1497 } |
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1498 } |
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1499 _should_revert_to_full_young_gcs = false; |
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1500 |
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1501 if (_last_young_gc_full && !_during_marking) { |
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1502 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1503 } |
1504 | |
1505 _short_lived_surv_rate_group->start_adding_regions(); | |
1506 // do that for any other surv rate groupsx | |
1507 | |
677 | 1508 if (update_stats) { |
342 | 1509 double pause_time_ms = elapsed_ms; |
1510 | |
1511 size_t diff = 0; | |
1512 if (_max_pending_cards >= _pending_cards) | |
1513 diff = _max_pending_cards - _pending_cards; | |
1514 _pending_card_diff_seq->add((double) diff); | |
1515 | |
1516 double cost_per_card_ms = 0.0; | |
1517 if (_pending_cards > 0) { | |
1518 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1519 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1520 } | |
1521 | |
1522 size_t cards_scanned = _g1->cards_scanned(); | |
1523 | |
1524 double cost_per_entry_ms = 0.0; | |
1525 if (cards_scanned > 10) { | |
1526 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1527 if (_last_young_gc_full) | |
1528 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1529 else | |
1530 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1531 } | |
1532 | |
1533 if (_max_rs_lengths > 0) { | |
1534 double cards_per_entry_ratio = | |
1535 (double) cards_scanned / (double) _max_rs_lengths; | |
1536 if (_last_young_gc_full) | |
1537 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1538 else | |
1539 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1540 } | |
1541 | |
1542 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1543 if (rs_length_diff >= 0) | |
1544 _rs_length_diff_seq->add((double) rs_length_diff); | |
1545 | |
1546 size_t copied_bytes = surviving_bytes; | |
1547 double cost_per_byte_ms = 0.0; | |
1548 if (copied_bytes > 0) { | |
1549 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1550 if (_in_marking_window) | |
1551 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1552 else | |
1553 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1554 } | |
1555 | |
1556 double all_other_time_ms = pause_time_ms - | |
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1557 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1558 _mark_closure_time_ms + termination_time); |
1559 | |
1560 double young_other_time_ms = 0.0; | |
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1561 if (young_cset_region_length() > 0) { |
342 | 1562 young_other_time_ms = |
1563 _recorded_young_cset_choice_time_ms + | |
1564 _recorded_young_free_cset_time_ms; | |
1565 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1566 (double) young_cset_region_length()); |
342 | 1567 } |
1568 double non_young_other_time_ms = 0.0; | |
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1569 if (old_cset_region_length() > 0) { |
342 | 1570 non_young_other_time_ms = |
1571 _recorded_non_young_cset_choice_time_ms + | |
1572 _recorded_non_young_free_cset_time_ms; | |
1573 | |
1574 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1575 (double) old_cset_region_length()); |
342 | 1576 } |
1577 | |
1578 double constant_other_time_ms = all_other_time_ms - | |
1579 (young_other_time_ms + non_young_other_time_ms); | |
1580 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1581 | |
1582 double survival_ratio = 0.0; | |
1583 if (_bytes_in_collection_set_before_gc > 0) { | |
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1584 survival_ratio = (double) _bytes_copied_during_gc / |
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1585 (double) _bytes_in_collection_set_before_gc; |
342 | 1586 } |
1587 | |
1588 _pending_cards_seq->add((double) _pending_cards); | |
1589 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1590 | |
1591 double expensive_region_limit_ms = | |
751 | 1592 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1593 if (expensive_region_limit_ms < 0.0) { |
1594 // this means that the other time was predicted to be longer than | |
1595 // than the max pause time | |
751 | 1596 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1597 } |
1598 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1599 } | |
1600 | |
1601 _in_marking_window = new_in_marking_window; | |
1602 _in_marking_window_im = new_in_marking_window_im; | |
1603 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1604 update_young_list_target_length(); |
342 | 1605 |
1111 | 1606 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1607 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1608 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1609 |
1610 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1611 } |
1612 | |
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1613 #define EXT_SIZE_FORMAT "%d%s" |
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1614 #define EXT_SIZE_PARAMS(bytes) \ |
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1615 byte_size_in_proper_unit((bytes)), \ |
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1616 proper_unit_for_byte_size((bytes)) |
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1617 |
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1618 void G1CollectorPolicy::print_heap_transition() { |
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1619 if (PrintGCDetails) { |
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1620 YoungList* young_list = _g1->young_list(); |
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1621 size_t eden_bytes = young_list->eden_used_bytes(); |
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1622 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1623 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1624 size_t used = _g1->used(); |
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1625 size_t capacity = _g1->capacity(); |
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1626 size_t eden_capacity = |
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1627 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1628 |
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1629 gclog_or_tty->print_cr( |
3920
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1630 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1631 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1632 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1633 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1634 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1635 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1636 EXT_SIZE_PARAMS(eden_bytes), |
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1637 EXT_SIZE_PARAMS(eden_capacity), |
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1638 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1639 EXT_SIZE_PARAMS(survivor_bytes), |
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1640 EXT_SIZE_PARAMS(used_before_gc), |
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1641 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1642 EXT_SIZE_PARAMS(used), |
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1643 EXT_SIZE_PARAMS(capacity)); |
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1644 |
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1645 _prev_eden_capacity = eden_capacity; |
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1646 } else if (PrintGC) { |
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1647 _g1->print_size_transition(gclog_or_tty, |
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1648 _cur_collection_pause_used_at_start_bytes, |
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1649 _g1->used(), _g1->capacity()); |
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1650 } |
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1651 } |
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1652 |
1111 | 1653 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1654 double update_rs_processed_buffers, | |
1655 double goal_ms) { | |
1656 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1657 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1658 | |
1282 | 1659 if (G1UseAdaptiveConcRefinement) { |
1111 | 1660 const int k_gy = 3, k_gr = 6; |
1661 const double inc_k = 1.1, dec_k = 0.9; | |
1662 | |
1663 int g = cg1r->green_zone(); | |
1664 if (update_rs_time > goal_ms) { | |
1665 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1666 } else { | |
1667 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1668 g = (int)MAX2(g * inc_k, g + 1.0); | |
1669 } | |
1670 } | |
1671 // Change the refinement threads params | |
1672 cg1r->set_green_zone(g); | |
1673 cg1r->set_yellow_zone(g * k_gy); | |
1674 cg1r->set_red_zone(g * k_gr); | |
1675 cg1r->reinitialize_threads(); | |
1676 | |
1677 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1678 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1679 cg1r->yellow_zone()); | |
1680 // Change the barrier params | |
1681 dcqs.set_process_completed_threshold(processing_threshold); | |
1682 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1683 } | |
1684 | |
1685 int curr_queue_size = dcqs.completed_buffers_num(); | |
1686 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1687 dcqs.set_completed_queue_padding(curr_queue_size); | |
1688 } else { | |
1689 dcqs.set_completed_queue_padding(0); | |
1690 } | |
1691 dcqs.notify_if_necessary(); | |
1692 } | |
1693 | |
342 | 1694 double |
1695 G1CollectorPolicy:: | |
1696 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1697 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1698 | |
1699 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1394
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1700 size_t young_num = g1h->young_list()->length(); |
342 | 1701 if (young_num == 0) |
1702 return 0.0; | |
1703 | |
1704 young_num += adjustment; | |
1705 size_t pending_cards = predict_pending_cards(); | |
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1706 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1707 predict_rs_length_diff(); |
1708 size_t card_num; | |
1709 if (full_young_gcs()) | |
1710 card_num = predict_young_card_num(rs_lengths); | |
1711 else | |
1712 card_num = predict_non_young_card_num(rs_lengths); | |
1713 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1714 double accum_yg_surv_rate = | |
1715 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1716 | |
1717 size_t bytes_to_copy = | |
1718 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1719 | |
1720 return | |
1721 predict_rs_update_time_ms(pending_cards) + | |
1722 predict_rs_scan_time_ms(card_num) + | |
1723 predict_object_copy_time_ms(bytes_to_copy) + | |
1724 predict_young_other_time_ms(young_num) + | |
1725 predict_constant_other_time_ms(); | |
1726 } | |
1727 | |
1728 double | |
1729 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1730 size_t rs_length = predict_rs_length_diff(); | |
1731 size_t card_num; | |
1732 if (full_young_gcs()) | |
1733 card_num = predict_young_card_num(rs_length); | |
1734 else | |
1735 card_num = predict_non_young_card_num(rs_length); | |
1736 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1737 } | |
1738 | |
1739 double | |
1740 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1741 size_t scanned_cards) { | |
1742 return | |
1743 predict_rs_update_time_ms(pending_cards) + | |
1744 predict_rs_scan_time_ms(scanned_cards) + | |
1745 predict_constant_other_time_ms(); | |
1746 } | |
1747 | |
1748 double | |
1749 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1750 bool young) { | |
1751 size_t rs_length = hr->rem_set()->occupied(); | |
1752 size_t card_num; | |
1753 if (full_young_gcs()) | |
1754 card_num = predict_young_card_num(rs_length); | |
1755 else | |
1756 card_num = predict_non_young_card_num(rs_length); | |
1757 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1758 | |
1759 double region_elapsed_time_ms = | |
1760 predict_rs_scan_time_ms(card_num) + | |
1761 predict_object_copy_time_ms(bytes_to_copy); | |
1762 | |
1763 if (young) | |
1764 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1765 else | |
1766 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1767 | |
1768 return region_elapsed_time_ms; | |
1769 } | |
1770 | |
1771 size_t | |
1772 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1773 size_t bytes_to_copy; | |
1774 if (hr->is_marked()) | |
1775 bytes_to_copy = hr->max_live_bytes(); | |
1776 else { | |
1777 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1778 "invariant" ); | |
1779 int age = hr->age_in_surv_rate_group(); | |
545 | 1780 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1781 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1782 } | |
1783 | |
1784 return bytes_to_copy; | |
1785 } | |
1786 | |
1787 void | |
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1788 G1CollectorPolicy::init_cset_region_lengths(size_t eden_cset_region_length, |
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1789 size_t survivor_cset_region_length) { |
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1790 _eden_cset_region_length = eden_cset_region_length; |
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1791 _survivor_cset_region_length = survivor_cset_region_length; |
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1792 _old_cset_region_length = 0; |
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1793 } |
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1794 |
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1795 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1796 _recorded_rs_lengths = rs_lengths; |
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1797 } |
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1798 |
342 | 1799 void G1CollectorPolicy::check_if_region_is_too_expensive(double |
1800 predicted_time_ms) { | |
1801 // I don't think we need to do this when in young GC mode since | |
1802 // marking will be initiated next time we hit the soft limit anyway... | |
1803 if (predicted_time_ms > _expensive_region_limit_ms) { | |
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1804 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1805 "request partially-young GCs end", |
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1806 ergo_format_reason("predicted region time higher than threshold") |
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1807 ergo_format_ms("predicted region time") |
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1808 ergo_format_ms("threshold"), |
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1809 predicted_time_ms, _expensive_region_limit_ms); |
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1810 // no point in doing another partial one |
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1811 _should_revert_to_full_young_gcs = true; |
342 | 1812 } |
1813 } | |
1814 | |
1815 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1816 double elapsed_ms) { | |
1817 _recent_gc_times_ms->add(elapsed_ms); | |
1818 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1819 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1820 } | |
1821 | |
1822 size_t G1CollectorPolicy::expansion_amount() { | |
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1823 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1824 double threshold = _gc_overhead_perc; |
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1825 if (recent_gc_overhead > threshold) { |
751 | 1826 // We will double the existing space, or take |
1827 // G1ExpandByPercentOfAvailable % of the available expansion | |
1828 // space, whichever is smaller, bounded below by a minimum | |
1829 // expansion (unless that's all that's left.) | |
342 | 1830 const size_t min_expand_bytes = 1*M; |
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1831 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1832 size_t committed_bytes = _g1->capacity(); |
1833 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1834 size_t expand_bytes; | |
1835 size_t expand_bytes_via_pct = | |
751 | 1836 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1837 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1838 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1839 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1840 |
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1841 ergo_verbose5(ErgoHeapSizing, |
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1842 "attempt heap expansion", |
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1843 ergo_format_reason("recent GC overhead higher than " |
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1844 "threshold after GC") |
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1845 ergo_format_perc("recent GC overhead") |
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1846 ergo_format_perc("threshold") |
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1847 ergo_format_byte("uncommitted") |
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1848 ergo_format_byte_perc("calculated expansion amount"), |
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1849 recent_gc_overhead, threshold, |
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1850 uncommitted_bytes, |
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1851 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1852 |
342 | 1853 return expand_bytes; |
1854 } else { | |
1855 return 0; | |
1856 } | |
1857 } | |
1858 | |
1859 class CountCSClosure: public HeapRegionClosure { | |
1860 G1CollectorPolicy* _g1_policy; | |
1861 public: | |
1862 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1863 _g1_policy(g1_policy) {} | |
1864 bool doHeapRegion(HeapRegion* r) { | |
1865 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1866 return false; | |
1867 } | |
1868 }; | |
1869 | |
1870 void G1CollectorPolicy::count_CS_bytes_used() { | |
1871 CountCSClosure cs_closure(this); | |
1872 _g1->collection_set_iterate(&cs_closure); | |
1873 } | |
1874 | |
4023 | 1875 void G1CollectorPolicy::print_summary(int level, |
1876 const char* str, | |
1877 NumberSeq* seq) const { | |
342 | 1878 double sum = seq->sum(); |
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1879 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1880 str, sum / 1000.0, seq->avg()); |
1881 } | |
1882 | |
4023 | 1883 void G1CollectorPolicy::print_summary_sd(int level, |
1884 const char* str, | |
1885 NumberSeq* seq) const { | |
342 | 1886 print_summary(level, str, seq); |
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1887 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1888 seq->num(), seq->sd(), seq->maximum()); |
1889 } | |
1890 | |
1891 void G1CollectorPolicy::check_other_times(int level, | |
1892 NumberSeq* other_times_ms, | |
1893 NumberSeq* calc_other_times_ms) const { | |
1894 bool should_print = false; | |
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1895 LineBuffer buf(level + 2); |
342 | 1896 |
1897 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1898 fabs(calc_other_times_ms->sum())); | |
1899 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1900 fabs(calc_other_times_ms->sum())); | |
1901 double sum_ratio = max_sum / min_sum; | |
1902 if (sum_ratio > 1.1) { | |
1903 should_print = true; | |
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1904 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1905 } |
1906 | |
1907 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1908 fabs(calc_other_times_ms->avg())); | |
1909 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1910 fabs(calc_other_times_ms->avg())); | |
1911 double avg_ratio = max_avg / min_avg; | |
1912 if (avg_ratio > 1.1) { | |
1913 should_print = true; | |
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1914 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1915 } |
1916 | |
1917 if (other_times_ms->sum() < -0.01) { | |
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1918 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1919 } |
1920 | |
1921 if (other_times_ms->avg() < -0.01) { | |
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1922 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1923 } |
1924 | |
1925 if (calc_other_times_ms->sum() < -0.01) { | |
1926 should_print = true; | |
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1927 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1928 } |
1929 | |
1930 if (calc_other_times_ms->avg() < -0.01) { | |
1931 should_print = true; | |
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1932 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1933 } |
1934 | |
1935 if (should_print) | |
1936 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1937 } | |
1938 | |
1939 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
1833
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1940 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1941 MainBodySummary* body_summary = summary->main_body_summary(); |
1942 if (summary->get_total_seq()->num() > 0) { | |
677 | 1943 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1944 if (body_summary != NULL) { |
1945 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
1946 if (parallel) { | |
1947 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 1948 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
1949 print_summary(2, "Mark Stack Scanning", body_summary->get_mark_stack_scan_seq()); | |
342 | 1950 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
1951 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
1952 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
1953 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 1954 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 1955 { |
1956 NumberSeq* other_parts[] = { | |
1957 body_summary->get_ext_root_scan_seq(), | |
1958 body_summary->get_mark_stack_scan_seq(), | |
4023 | 1959 body_summary->get_update_rs_seq(), |
342 | 1960 body_summary->get_scan_rs_seq(), |
1961 body_summary->get_obj_copy_seq(), | |
1962 body_summary->get_termination_seq() | |
1963 }; | |
1964 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 1965 6, other_parts); |
342 | 1966 check_other_times(2, body_summary->get_parallel_other_seq(), |
1967 &calc_other_times_ms); | |
1968 } | |
1969 } else { | |
4023 | 1970 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
1971 print_summary(1, "Mark Stack Scanning", body_summary->get_mark_stack_scan_seq()); | |
342 | 1972 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
1973 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
1974 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
1975 } | |
1976 } | |
4023 | 1977 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
1978 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
342 | 1979 print_summary(1, "Other", summary->get_other_seq()); |
1980 { | |
1779 | 1981 if (body_summary != NULL) { |
1982 NumberSeq calc_other_times_ms; | |
1983 if (parallel) { | |
1984 // parallel | |
1985 NumberSeq* other_parts[] = { | |
1986 body_summary->get_satb_drain_seq(), | |
1987 body_summary->get_parallel_seq(), | |
1988 body_summary->get_clear_ct_seq() | |
1989 }; | |
1990 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
1991 3, other_parts); | |
1992 } else { | |
1993 // serial | |
1994 NumberSeq* other_parts[] = { | |
1995 body_summary->get_satb_drain_seq(), | |
1996 body_summary->get_update_rs_seq(), | |
1997 body_summary->get_ext_root_scan_seq(), | |
1998 body_summary->get_mark_stack_scan_seq(), | |
1999 body_summary->get_scan_rs_seq(), | |
2000 body_summary->get_obj_copy_seq() | |
2001 }; | |
2002 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2003 6, other_parts); | |
2004 } | |
2005 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2006 } |
2007 } | |
2008 } else { | |
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2009 LineBuffer(1).append_and_print_cr("none"); |
342 | 2010 } |
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2011 LineBuffer(0).append_and_print_cr(""); |
342 | 2012 } |
2013 | |
2014 void G1CollectorPolicy::print_tracing_info() const { | |
2015 if (TraceGen0Time) { | |
2016 gclog_or_tty->print_cr("ALL PAUSES"); | |
2017 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2018 gclog_or_tty->print_cr(""); | |
2019 gclog_or_tty->print_cr(""); | |
2020 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2021 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2022 gclog_or_tty->print_cr(""); | |
2023 | |
677 | 2024 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2025 print_summary(_summary); | |
342 | 2026 |
2027 gclog_or_tty->print_cr("MISC"); | |
2028 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2029 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2030 for (int i = 0; i < _aux_num; ++i) { | |
2031 if (_all_aux_times_ms[i].num() > 0) { | |
2032 char buffer[96]; | |
2033 sprintf(buffer, "Aux%d", i); | |
2034 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2035 } | |
2036 } | |
2037 } | |
2038 if (TraceGen1Time) { | |
2039 if (_all_full_gc_times_ms->num() > 0) { | |
2040 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2041 _all_full_gc_times_ms->num(), | |
2042 _all_full_gc_times_ms->sum() / 1000.0); | |
2043 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2044 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2045 _all_full_gc_times_ms->sd(), | |
2046 _all_full_gc_times_ms->maximum()); | |
2047 } | |
2048 } | |
2049 } | |
2050 | |
2051 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2052 #ifndef PRODUCT | |
2053 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2054 // add this call for any other surv rate groups | |
2055 #endif // PRODUCT | |
2056 } | |
2057 | |
2058 #ifndef PRODUCT | |
2059 // for debugging, bit of a hack... | |
2060 static char* | |
2061 region_num_to_mbs(int length) { | |
2062 static char buffer[64]; | |
2063 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2064 double mbs = bytes / (double) (1024 * 1024); | |
2065 sprintf(buffer, "%7.2lfMB", mbs); | |
2066 return buffer; | |
2067 } | |
2068 #endif // PRODUCT | |
2069 | |
545 | 2070 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2071 switch (purpose) { |
2072 case GCAllocForSurvived: | |
545 | 2073 return _max_survivor_regions; |
342 | 2074 case GCAllocForTenured: |
545 | 2075 return REGIONS_UNLIMITED; |
342 | 2076 default: |
545 | 2077 ShouldNotReachHere(); |
2078 return REGIONS_UNLIMITED; | |
342 | 2079 }; |
2080 } | |
2081 | |
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2082 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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2083 size_t expansion_region_num = 0; |
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2084 if (GCLockerEdenExpansionPercent > 0) { |
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2085 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2086 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2087 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2088 // less than 1.0) we'll get 1. |
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2089 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2090 } else { |
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2091 assert(expansion_region_num == 0, "sanity"); |
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2092 } |
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2093 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2094 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2095 } |
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2096 |
545 | 2097 // Calculates survivor space parameters. |
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2098 void G1CollectorPolicy::update_survivors_policy() { |
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2099 double max_survivor_regions_d = |
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2100 (double) _young_list_target_length / (double) SurvivorRatio; |
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2101 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2102 // smaller than 1.0) we'll get 1. |
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2103 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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2104 |
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2105 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2106 HeapRegion::GrainWords * _max_survivor_regions); |
2107 } | |
2108 | |
342 | 2109 #ifndef PRODUCT |
2110 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2111 CollectionSetChooser* _chooser; | |
2112 public: | |
2113 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2114 _chooser(chooser) {} | |
2115 | |
2116 bool doHeapRegion(HeapRegion* r) { | |
2117 if (!r->continuesHumongous()) { | |
2118 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2119 } | |
2120 return false; | |
2121 } | |
2122 }; | |
2123 | |
4013 | 2124 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2125 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2126 _g1->heap_region_iterate(&cl); | |
2127 return true; | |
2128 } | |
2129 #endif | |
2130 | |
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2131 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2132 GCCause::Cause gc_cause) { |
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2133 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2134 if (!during_cycle) { |
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2135 ergo_verbose1(ErgoConcCycles, |
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2136 "request concurrent cycle initiation", |
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2137 ergo_format_reason("requested by GC cause") |
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2138 ergo_format_str("GC cause"), |
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2139 GCCause::to_string(gc_cause)); |
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2140 set_initiate_conc_mark_if_possible(); |
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2141 return true; |
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2142 } else { |
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2143 ergo_verbose1(ErgoConcCycles, |
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2144 "do not request concurrent cycle initiation", |
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2145 ergo_format_reason("concurrent cycle already in progress") |
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2146 ergo_format_str("GC cause"), |
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2147 GCCause::to_string(gc_cause)); |
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2148 return false; |
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2149 } |
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2150 } |
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2151 |
342 | 2152 void |
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2153 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2154 // We are about to decide on whether this pause will be an |
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2155 // initial-mark pause. |
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2156 |
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2157 // First, during_initial_mark_pause() should not be already set. We |
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2158 // will set it here if we have to. However, it should be cleared by |
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2159 // the end of the pause (it's only set for the duration of an |
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2160 // initial-mark pause). |
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2161 assert(!during_initial_mark_pause(), "pre-condition"); |
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2162 |
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2163 if (initiate_conc_mark_if_possible()) { |
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2164 // We had noticed on a previous pause that the heap occupancy has |
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2165 // gone over the initiating threshold and we should start a |
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2166 // concurrent marking cycle. So we might initiate one. |
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2167 |
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2168 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2169 if (!during_cycle) { |
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2170 // The concurrent marking thread is not "during a cycle", i.e., |
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2171 // it has completed the last one. So we can go ahead and |
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2172 // initiate a new cycle. |
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2173 |
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2174 set_during_initial_mark_pause(); |
3982
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2175 // We do not allow non-full young GCs during marking. |
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2176 if (!full_young_gcs()) { |
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2177 set_full_young_gcs(true); |
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2178 ergo_verbose0(ErgoPartiallyYoungGCs, |
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2179 "end partially-young GCs", |
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2180 ergo_format_reason("concurrent cycle is about to start")); |
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2181 } |
1359
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2182 |
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2183 // And we can now clear initiate_conc_mark_if_possible() as |
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2184 // we've already acted on it. |
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2185 clear_initiate_conc_mark_if_possible(); |
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2186 |
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2187 ergo_verbose0(ErgoConcCycles, |
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2188 "initiate concurrent cycle", |
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2189 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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2190 } else { |
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2191 // The concurrent marking thread is still finishing up the |
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2192 // previous cycle. If we start one right now the two cycles |
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2193 // overlap. In particular, the concurrent marking thread might |
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2194 // be in the process of clearing the next marking bitmap (which |
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2195 // we will use for the next cycle if we start one). Starting a |
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2196 // cycle now will be bad given that parts of the marking |
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2197 // information might get cleared by the marking thread. And we |
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2198 // cannot wait for the marking thread to finish the cycle as it |
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2199 // periodically yields while clearing the next marking bitmap |
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2200 // and, if it's in a yield point, it's waiting for us to |
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2201 // finish. So, at this point we will not start a cycle and we'll |
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2202 // let the concurrent marking thread complete the last one. |
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2203 ergo_verbose0(ErgoConcCycles, |
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2204 "do not initiate concurrent cycle", |
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2205 ergo_format_reason("concurrent cycle already in progress")); |
1359
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2206 } |
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2207 } |
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2208 } |
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2209 |
342 | 2210 class KnownGarbageClosure: public HeapRegionClosure { |
2211 CollectionSetChooser* _hrSorted; | |
2212 | |
2213 public: | |
2214 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2215 _hrSorted(hrSorted) | |
2216 {} | |
2217 | |
2218 bool doHeapRegion(HeapRegion* r) { | |
2219 // We only include humongous regions in collection | |
2220 // sets when concurrent mark shows that their contained object is | |
2221 // unreachable. | |
2222 | |
2223 // Do we have any marking information for this region? | |
2224 if (r->is_marked()) { | |
2225 // We don't include humongous regions in collection | |
2226 // sets because we collect them immediately at the end of a marking | |
2227 // cycle. We also don't include young regions because we *must* | |
2228 // include them in the next collection pause. | |
2229 if (!r->isHumongous() && !r->is_young()) { | |
2230 _hrSorted->addMarkedHeapRegion(r); | |
2231 } | |
2232 } | |
2233 return false; | |
2234 } | |
2235 }; | |
2236 | |
2237 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2238 CollectionSetChooser* _hrSorted; | |
2239 jint _marked_regions_added; | |
2240 jint _chunk_size; | |
2241 jint _cur_chunk_idx; | |
2242 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2243 int _worker; | |
2244 int _invokes; | |
2245 | |
2246 void get_new_chunk() { | |
2247 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2248 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2249 } | |
2250 void add_region(HeapRegion* r) { | |
2251 if (_cur_chunk_idx == _cur_chunk_end) { | |
2252 get_new_chunk(); | |
2253 } | |
2254 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2255 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2256 _marked_regions_added++; | |
2257 _cur_chunk_idx++; | |
2258 } | |
2259 | |
2260 public: | |
2261 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2262 jint chunk_size, | |
2263 int worker) : | |
2264 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2265 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2266 _invokes(0) | |
2267 {} | |
2268 | |
2269 bool doHeapRegion(HeapRegion* r) { | |
2270 // We only include humongous regions in collection | |
2271 // sets when concurrent mark shows that their contained object is | |
2272 // unreachable. | |
2273 _invokes++; | |
2274 | |
2275 // Do we have any marking information for this region? | |
2276 if (r->is_marked()) { | |
2277 // We don't include humongous regions in collection | |
2278 // sets because we collect them immediately at the end of a marking | |
2279 // cycle. | |
2280 // We also do not include young regions in collection sets | |
2281 if (!r->isHumongous() && !r->is_young()) { | |
2282 add_region(r); | |
2283 } | |
2284 } | |
2285 return false; | |
2286 } | |
2287 jint marked_regions_added() { return _marked_regions_added; } | |
2288 int invokes() { return _invokes; } | |
2289 }; | |
2290 | |
2291 class ParKnownGarbageTask: public AbstractGangTask { | |
2292 CollectionSetChooser* _hrSorted; | |
2293 jint _chunk_size; | |
2294 G1CollectedHeap* _g1; | |
2295 public: | |
2296 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2297 AbstractGangTask("ParKnownGarbageTask"), | |
2298 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2299 _g1(G1CollectedHeap::heap()) | |
2300 {} | |
2301 | |
2302 void work(int i) { | |
2303 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2304 // Back to zero for the claim value. | |
355 | 2305 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
4095
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2306 _g1->workers()->active_workers(), |
355 | 2307 HeapRegion::InitialClaimValue); |
342 | 2308 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2309 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2310 if (G1PrintParCleanupStats) { | |
2363
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2311 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2312 i, parKnownGarbageCl.invokes(), regions_added); |
2313 } | |
2314 } | |
2315 }; | |
2316 | |
2317 void | |
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2318 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
4013 | 2319 double start_sec; |
2320 if (G1PrintParCleanupStats) { | |
2321 start_sec = os::elapsedTime(); | |
2322 } | |
342 | 2323 |
2324 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2325 double clear_marked_end_sec; |
342 | 2326 if (G1PrintParCleanupStats) { |
4013 | 2327 clear_marked_end_sec = os::elapsedTime(); |
2328 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2329 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2330 } |
4013 | 2331 |
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2332 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2333 const size_t OverpartitionFactor = 4; |
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2334 size_t WorkUnit; |
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2335 // The use of MinChunkSize = 8 in the original code |
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2336 // causes some assertion failures when the total number of |
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2337 // region is less than 8. The code here tries to fix that. |
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2338 // Should the original code also be fixed? |
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2339 if (no_of_gc_threads > 0) { |
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2340 const size_t MinWorkUnit = |
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2341 MAX2(_g1->n_regions() / no_of_gc_threads, (size_t) 1U); |
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2342 WorkUnit = |
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2343 MAX2(_g1->n_regions() / (no_of_gc_threads * OverpartitionFactor), |
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2344 MinWorkUnit); |
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2345 } else { |
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2346 assert(no_of_gc_threads > 0, |
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2347 "The active gc workers should be greater than 0"); |
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2348 // In a product build do something reasonable to avoid a crash. |
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2349 const size_t MinWorkUnit = |
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2350 MAX2(_g1->n_regions() / ParallelGCThreads, (size_t) 1U); |
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2351 WorkUnit = |
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2352 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2353 MinWorkUnit); |
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2354 } |
342 | 2355 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2356 WorkUnit); |
342 | 2357 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2358 (int) WorkUnit); |
342 | 2359 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2360 |
2361 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2362 "sanity check"); | |
342 | 2363 } else { |
2364 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2365 _g1->heap_region_iterate(&knownGarbagecl); | |
2366 } | |
4013 | 2367 double known_garbage_end_sec; |
342 | 2368 if (G1PrintParCleanupStats) { |
4013 | 2369 known_garbage_end_sec = os::elapsedTime(); |
342 | 2370 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2371 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2372 } |
4013 | 2373 |
342 | 2374 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2375 double end_sec = os::elapsedTime(); |
342 | 2376 if (G1PrintParCleanupStats) { |
2377 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2378 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2379 } |
2380 | |
4013 | 2381 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2382 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2383 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2384 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2385 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2386 } |
2387 | |
1394
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|
2388 // Add the heap region at the head of the non-incremental collection set |
4090
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|
2389 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
1394
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2390 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
2391 assert(!hr->is_young(), "non-incremental add of young region"); |
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2392 |
342 | 2393 if (_g1->mark_in_progress()) |
2394 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2395 | |
1394
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|
2396 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2397 hr->set_in_collection_set(true); |
2398 hr->set_next_in_collection_set(_collection_set); | |
2399 _collection_set = hr; | |
2400 _collection_set_bytes_used_before += hr->used(); | |
526 | 2401 _g1->register_region_with_in_cset_fast_test(hr); |
4090
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|
2402 size_t rs_length = hr->rem_set()->occupied(); |
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|
2403 _recorded_rs_lengths += rs_length; |
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|
2404 _old_cset_region_length += 1; |
342 | 2405 } |
2406 | |
1394
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2407 // Initialize the per-collection-set information |
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2408 void G1CollectorPolicy::start_incremental_cset_building() { |
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2409 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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|
2410 |
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|
2411 _inc_cset_head = NULL; |
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2412 _inc_cset_tail = NULL; |
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2413 _inc_cset_bytes_used_before = 0; |
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2414 |
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2415 _inc_cset_max_finger = 0; |
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|
2416 _inc_cset_recorded_rs_lengths = 0; |
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2417 _inc_cset_predicted_elapsed_time_ms = 0; |
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2418 _inc_cset_build_state = Active; |
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|
2419 } |
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|
2420 |
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|
2421 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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|
2422 // This routine is used when: |
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2423 // * adding survivor regions to the incremental cset at the end of an |
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|
2424 // evacuation pause, |
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|
2425 // * adding the current allocation region to the incremental cset |
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|
2426 // when it is retired, and |
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|
2427 // * updating existing policy information for a region in the |
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|
2428 // incremental cset via young list RSet sampling. |
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|
2429 // Therefore this routine may be called at a safepoint by the |
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diff
changeset
|
2430 // VM thread, or in-between safepoints by mutator threads (when |
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|
2431 // retiring the current allocation region) or a concurrent |
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|
2432 // refine thread (RSet sampling). |
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|
2433 |
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|
2434 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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|
2435 size_t used_bytes = hr->used(); |
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|
2436 |
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|
2437 _inc_cset_recorded_rs_lengths += rs_length; |
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|
2438 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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|
2439 |
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|
2440 _inc_cset_bytes_used_before += used_bytes; |
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|
2441 |
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|
2442 // Cache the values we have added to the aggregated informtion |
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|
2443 // in the heap region in case we have to remove this region from |
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|
2444 // the incremental collection set, or it is updated by the |
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|
2445 // rset sampling code |
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|
2446 hr->set_recorded_rs_length(rs_length); |
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|
2447 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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|
2448 } |
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|
2449 |
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|
2450 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
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|
2451 // This routine is currently only called as part of the updating of |
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|
2452 // existing policy information for regions in the incremental cset that |
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|
2453 // is performed by the concurrent refine thread(s) as part of young list |
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|
2454 // RSet sampling. Therefore we should not be at a safepoint. |
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|
2455 |
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|
2456 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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|
2457 assert(hr->is_young(), "it should be"); |
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|
2458 |
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|
2459 size_t used_bytes = hr->used(); |
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|
2460 size_t old_rs_length = hr->recorded_rs_length(); |
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|
2461 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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|
2462 |
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diff
changeset
|
2463 // Subtract the old recorded/predicted policy information for |
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diff
changeset
|
2464 // the given heap region from the collection set info. |
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diff
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|
2465 _inc_cset_recorded_rs_lengths -= old_rs_length; |
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|
2466 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2467 |
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|
2468 _inc_cset_bytes_used_before -= used_bytes; |
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|
2469 |
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diff
changeset
|
2470 // Clear the values cached in the heap region |
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|
2471 hr->set_recorded_rs_length(0); |
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|
2472 hr->set_predicted_elapsed_time_ms(0); |
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|
2473 } |
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|
2474 |
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|
2475 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
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|
2476 // Update the collection set information that is dependent on the new RS length |
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|
2477 assert(hr->is_young(), "Precondition"); |
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|
2478 |
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|
2479 remove_from_incremental_cset_info(hr); |
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|
2480 add_to_incremental_cset_info(hr, new_rs_length); |
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|
2481 } |
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|
2482 |
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|
2483 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
a88de71c4e3a
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|
2484 assert(hr->is_young(), "invariant"); |
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|
2485 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
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|
2486 assert(_inc_cset_build_state == Active, "Precondition"); |
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diff
changeset
|
2487 |
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diff
changeset
|
2488 // We need to clear and set the cached recorded/cached collection set |
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|
2489 // information in the heap region here (before the region gets added |
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diff
changeset
|
2490 // to the collection set). An individual heap region's cached values |
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|
2491 // are calculated, aggregated with the policy collection set info, |
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|
2492 // and cached in the heap region here (initially) and (subsequently) |
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|
2493 // by the Young List sampling code. |
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|
2494 |
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|
2495 size_t rs_length = hr->rem_set()->occupied(); |
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|
2496 add_to_incremental_cset_info(hr, rs_length); |
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diff
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|
2497 |
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changeset
|
2498 HeapWord* hr_end = hr->end(); |
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|
2499 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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|
2500 |
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|
2501 assert(!hr->in_collection_set(), "invariant"); |
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|
2502 hr->set_in_collection_set(true); |
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|
2503 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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|
2504 |
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changeset
|
2505 _g1->register_region_with_in_cset_fast_test(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2506 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2507 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2508 // 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
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parents:
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diff
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|
2509 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
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parents:
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changeset
|
2510 // 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
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parents:
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diff
changeset
|
2511 assert( hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2512 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2513 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2514 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2515 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2516 // Now add the region at the right hand side |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2517 if (_inc_cset_tail == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2518 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2519 _inc_cset_head = hr; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2520 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2521 _inc_cset_tail->set_next_in_collection_set(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2522 } |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2523 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2524 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2525 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2526 // 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
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parents:
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diff
changeset
|
2527 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
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parents:
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diff
changeset
|
2528 // 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
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parents:
1391
diff
changeset
|
2529 assert(!hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2530 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2531 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2532 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2533 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2534 // Add the region at the left hand side |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2535 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2536 if (_inc_cset_head == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2537 assert(_inc_cset_tail == NULL, "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2538 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2539 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2540 _inc_cset_head = hr; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2541 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2542 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2543 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2544 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
|
2545 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
|
2546 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2547 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
|
2548 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2549 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2550 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
|
2551 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
|
2552 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
|
2553 "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
|
2554 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2555 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2556 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
|
2557 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
|
2558 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
|
2559 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
|
2560 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2561 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2562 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2563 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2564 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2565 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2566 |
4013 | 2567 void G1CollectorPolicy::choose_collection_set(double target_pause_time_ms) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2568 // Set this here - in case we're not doing young collections. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2569 double non_young_start_time_sec = os::elapsedTime(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2570 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2571 YoungList* young_list = _g1->young_list(); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2572 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2573 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2574 err_msg("target_pause_time_ms = %1.6lf should be positive", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2575 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2576 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2577 |
2578 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2579 double predicted_pause_time_ms = base_time_ms; | |
2580 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2581 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2582 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2583 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2584 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2585 ergo_format_ms("predicted base time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2586 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2587 ergo_format_ms("target pause time"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2588 base_time_ms, time_remaining_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2589 |
342 | 2590 // the 10% and 50% values are arbitrary... |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2591 double threshold = 0.10 * target_pause_time_ms; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2592 if (time_remaining_ms < threshold) { |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2593 double prev_time_remaining_ms = time_remaining_ms; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2594 time_remaining_ms = 0.50 * target_pause_time_ms; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2595 ergo_verbose3(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2596 "adjust remaining time", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2597 ergo_format_reason("remaining time lower than threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2598 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2599 ergo_format_ms("threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2600 ergo_format_ms("adjusted remaining time"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2601 prev_time_remaining_ms, threshold, time_remaining_ms); |
342 | 2602 } |
2603 | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2604 size_t expansion_bytes = _g1->expansion_regions() * HeapRegion::GrainBytes; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2605 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2606 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2607 double young_start_time_sec = os::elapsedTime(); |
342 | 2608 |
677 | 2609 _collection_set_bytes_used_before = 0; |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2610 _last_young_gc_full = full_young_gcs() ? true : false; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2611 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2612 if (_last_young_gc_full) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2613 ++_full_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2614 } else { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2615 ++_partial_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2616 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2617 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2618 // The young list is laid with the survivor regions from the previous |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2619 // pause are appended to the RHS of the young list, i.e. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2620 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2621 |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2622 size_t survivor_region_length = young_list->survivor_length(); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2623 size_t eden_region_length = young_list->length() - survivor_region_length; |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2624 init_cset_region_lengths(eden_region_length, survivor_region_length); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2625 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2626 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2627 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2628 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2629 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2630 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2631 |
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2632 // Clear the fields that point to the survivor list - they are all young now. |
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2633 young_list->clear_survivors(); |
3867
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2634 |
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2635 if (_g1->mark_in_progress()) |
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2636 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
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2637 |
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2638 _collection_set = _inc_cset_head; |
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2639 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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2640 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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2641 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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2642 |
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2643 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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2644 "add young regions to CSet", |
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2645 ergo_format_region("eden") |
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2646 ergo_format_region("survivors") |
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2647 ergo_format_ms("predicted young region time"), |
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2648 eden_region_length, survivor_region_length, |
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2649 _inc_cset_predicted_elapsed_time_ms); |
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2650 |
3867
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2651 // The number of recorded young regions is the incremental |
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2652 // collection set's current size |
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2653 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2654 |
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2655 double young_end_time_sec = os::elapsedTime(); |
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2656 _recorded_young_cset_choice_time_ms = |
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2657 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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2658 |
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2659 // We are doing young collections so reset this. |
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2660 non_young_start_time_sec = young_end_time_sec; |
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2661 |
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2662 if (!full_young_gcs()) { |
342 | 2663 bool should_continue = true; |
2664 NumberSeq seq; | |
2665 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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2666 |
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2667 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
342 | 2668 do { |
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2669 // Note that add_old_region_to_cset() increments the |
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2670 // _old_cset_region_length field and cset_region_length() returns the |
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2671 // sum of _eden_cset_region_length, _survivor_cset_region_length, and |
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2672 // _old_cset_region_length. So, as old regions are added to the |
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2673 // CSet, _old_cset_region_length will be incremented and |
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2674 // cset_region_length(), which is used below, will always reflect |
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2675 // the the total number of regions added up to this point to the CSet. |
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2676 |
342 | 2677 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, |
2678 avg_prediction); | |
677 | 2679 if (hr != NULL) { |
4072 | 2680 _g1->old_set_remove(hr); |
342 | 2681 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2682 time_remaining_ms -= predicted_time_ms; | |
2683 predicted_pause_time_ms += predicted_time_ms; | |
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2684 add_old_region_to_cset(hr); |
342 | 2685 seq.add(predicted_time_ms); |
2686 avg_prediction = seq.avg() + seq.sd(); | |
2687 } | |
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|
2688 |
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|
2689 should_continue = true; |
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2690 if (hr == NULL) { |
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2691 // No need for an ergo verbose message here, |
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2692 // getNextMarkRegion() does this when it returns NULL. |
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2693 should_continue = false; |
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|
2694 } else { |
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|
2695 if (adaptive_young_list_length()) { |
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|
2696 if (time_remaining_ms < 0.0) { |
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|
2697 ergo_verbose1(ErgoCSetConstruction, |
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|
2698 "stop adding old regions to CSet", |
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|
2699 ergo_format_reason("remaining time is lower than 0") |
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|
2700 ergo_format_ms("remaining time"), |
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|
2701 time_remaining_ms); |
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|
2702 should_continue = false; |
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|
2703 } |
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|
2704 } else { |
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|
2705 if (cset_region_length() >= _young_list_fixed_length) { |
3914
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|
2706 ergo_verbose2(ErgoCSetConstruction, |
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|
2707 "stop adding old regions to CSet", |
3927
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diff
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|
2708 ergo_format_reason("CSet length reached target") |
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|
2709 ergo_format_region("CSet") |
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|
2710 ergo_format_region("young target"), |
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|
2711 cset_region_length(), _young_list_fixed_length); |
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|
2712 should_continue = false; |
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|
2713 } |
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|
2714 } |
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|
2715 } |
342 | 2716 } while (should_continue); |
2717 | |
2718 if (!adaptive_young_list_length() && | |
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2719 cset_region_length() < _young_list_fixed_length) { |
3914
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|
2720 ergo_verbose2(ErgoCSetConstruction, |
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|
2721 "request partially-young GCs end", |
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|
2722 ergo_format_reason("CSet length lower than target") |
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|
2723 ergo_format_region("CSet") |
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|
2724 ergo_format_region("young target"), |
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|
2725 cset_region_length(), _young_list_fixed_length); |
342 | 2726 _should_revert_to_full_young_gcs = true; |
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|
2727 } |
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|
2728 |
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|
2729 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
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|
2730 "add old regions to CSet", |
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|
2731 ergo_format_region("old") |
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|
2732 ergo_format_ms("predicted old region time"), |
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|
2733 old_cset_region_length(), |
3914
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|
2734 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
342 | 2735 } |
2736 | |
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2737 stop_incremental_cset_building(); |
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|
2738 |
342 | 2739 count_CS_bytes_used(); |
2740 | |
3914
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|
2741 ergo_verbose5(ErgoCSetConstruction, |
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|
2742 "finish choosing CSet", |
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|
2743 ergo_format_region("eden") |
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|
2744 ergo_format_region("survivors") |
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|
2745 ergo_format_region("old") |
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|
2746 ergo_format_ms("predicted pause time") |
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|
2747 ergo_format_ms("target pause time"), |
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2748 eden_region_length, survivor_region_length, |
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|
2749 old_cset_region_length(), |
3914
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|
2750 predicted_pause_time_ms, target_pause_time_ms); |
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|
2751 |
342 | 2752 double non_young_end_time_sec = os::elapsedTime(); |
2753 _recorded_non_young_cset_choice_time_ms = | |
2754 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2755 } |