Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 4022:db89aa49298f
7099824: G1: we should take the pending list lock before doing the remark pause
Summary: Acquire the pending list lock in the prologue method of G1's concurrent VM_Operation and release the lock in the epilogue() method. The locking/unlocking order of the pending list lock and the Heap_lock should match that in the prologue and epilogue methods of VM_GC_Operation.
Reviewed-by: tonyp, ysr
author | johnc |
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date | Thu, 20 Oct 2011 12:06:20 -0700 |
parents | 074f0252cc13 |
children | c6a6e936dc68 |
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 #define PREDICTIONS_VERBOSE 0 | |
40 | |
41 // <NEW PREDICTION> | |
42 | |
43 // Different defaults for different number of GC threads | |
44 // They were chosen by running GCOld and SPECjbb on debris with different | |
45 // numbers of GC threads and choosing them based on the results | |
46 | |
47 // all the same | |
48 static double rs_length_diff_defaults[] = { | |
49 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
50 }; | |
51 | |
52 static double cost_per_card_ms_defaults[] = { | |
53 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
54 }; | |
55 | |
56 // all the same | |
57 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
58 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
59 }; | |
60 | |
61 static double cost_per_entry_ms_defaults[] = { | |
62 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
63 }; | |
64 | |
65 static double cost_per_byte_ms_defaults[] = { | |
66 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
67 }; | |
68 | |
69 // these should be pretty consistent | |
70 static double constant_other_time_ms_defaults[] = { | |
71 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
72 }; | |
73 | |
74 | |
75 static double young_other_cost_per_region_ms_defaults[] = { | |
76 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
77 }; | |
78 | |
79 static double non_young_other_cost_per_region_ms_defaults[] = { | |
80 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
81 }; | |
82 | |
83 // </NEW PREDICTION> | |
84 | |
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85 // Help class for avoiding interleaved logging |
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86 class LineBuffer: public StackObj { |
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87 |
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88 private: |
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89 static const int BUFFER_LEN = 1024; |
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90 static const int INDENT_CHARS = 3; |
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91 char _buffer[BUFFER_LEN]; |
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92 int _indent_level; |
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93 int _cur; |
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94 |
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95 void vappend(const char* format, va_list ap) { |
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96 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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97 if (res != -1) { |
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98 _cur += res; |
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99 } else { |
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100 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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101 _buffer[BUFFER_LEN -1] = 0; |
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102 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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103 } |
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104 } |
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105 |
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106 public: |
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107 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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108 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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109 _buffer[_cur] = ' '; |
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110 } |
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111 } |
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112 |
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113 #ifndef PRODUCT |
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114 ~LineBuffer() { |
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115 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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116 } |
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117 #endif |
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118 |
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119 void append(const char* format, ...) { |
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120 va_list ap; |
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121 va_start(ap, format); |
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122 vappend(format, ap); |
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123 va_end(ap); |
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124 } |
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125 |
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126 void append_and_print_cr(const char* format, ...) { |
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127 va_list ap; |
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128 va_start(ap, format); |
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129 vappend(format, ap); |
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130 va_end(ap); |
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131 gclog_or_tty->print_cr("%s", _buffer); |
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132 _cur = _indent_level * INDENT_CHARS; |
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133 } |
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134 }; |
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135 |
342 | 136 G1CollectorPolicy::G1CollectorPolicy() : |
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137 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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138 ? ParallelGCThreads : 1), |
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139 |
342 | 140 _n_pauses(0), |
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141 _recent_rs_scan_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
342 | 142 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
143 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
144 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
145 _all_pause_times_ms(new NumberSeq()), | |
146 _stop_world_start(0.0), | |
147 _all_stop_world_times_ms(new NumberSeq()), | |
148 _all_yield_times_ms(new NumberSeq()), | |
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149 _using_new_ratio_calculations(false), |
342 | 150 |
151 _all_mod_union_times_ms(new NumberSeq()), | |
152 | |
677 | 153 _summary(new Summary()), |
342 | 154 |
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155 _cur_clear_ct_time_ms(0.0), |
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156 |
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157 _cur_ref_proc_time_ms(0.0), |
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158 _cur_ref_enq_time_ms(0.0), |
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159 |
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160 #ifndef PRODUCT |
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161 _min_clear_cc_time_ms(-1.0), |
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162 _max_clear_cc_time_ms(-1.0), |
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163 _cur_clear_cc_time_ms(0.0), |
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164 _cum_clear_cc_time_ms(0.0), |
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165 _num_cc_clears(0L), |
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166 #endif |
342 | 167 |
168 _region_num_young(0), | |
169 _region_num_tenured(0), | |
170 _prev_region_num_young(0), | |
171 _prev_region_num_tenured(0), | |
172 | |
173 _aux_num(10), | |
174 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
175 _cur_aux_start_times_ms(new double[_aux_num]), | |
176 _cur_aux_times_ms(new double[_aux_num]), | |
177 _cur_aux_times_set(new bool[_aux_num]), | |
178 | |
179 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
180 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
181 | |
182 // <NEW PREDICTION> | |
183 | |
184 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
185 _prev_collection_pause_end_ms(0.0), | |
186 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
187 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
188 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
189 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
190 _partially_young_cards_per_entry_ratio_seq( | |
191 new TruncatedSeq(TruncatedSeqLength)), | |
192 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
193 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
194 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
195 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
196 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
197 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
198 _non_young_other_cost_per_region_ms_seq( | |
199 new TruncatedSeq(TruncatedSeqLength)), | |
200 | |
201 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
202 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
203 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
204 | |
751 | 205 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 206 |
207 // </NEW PREDICTION> | |
208 | |
209 _full_young_gcs(true), | |
210 _full_young_pause_num(0), | |
211 _partial_young_pause_num(0), | |
212 | |
213 _during_marking(false), | |
214 _in_marking_window(false), | |
215 _in_marking_window_im(false), | |
216 | |
217 _known_garbage_ratio(0.0), | |
218 _known_garbage_bytes(0), | |
219 | |
220 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
221 | |
222 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
223 | |
224 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
225 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
226 | |
227 _recent_avg_pause_time_ratio(0.0), | |
228 | |
229 _all_full_gc_times_ms(new NumberSeq()), | |
230 | |
231 // G1PausesBtwnConcMark defaults to -1 | |
232 // so the hack is to do the cast QQQ FIXME | |
233 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
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234 _initiate_conc_mark_if_possible(false), |
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235 _during_initial_mark_pause(false), |
342 | 236 _should_revert_to_full_young_gcs(false), |
237 _last_full_young_gc(false), | |
238 | |
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239 _eden_bytes_before_gc(0), |
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240 _survivor_bytes_before_gc(0), |
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241 _capacity_before_gc(0), |
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242 |
342 | 243 _prev_collection_pause_used_at_end_bytes(0), |
244 | |
245 _collection_set(NULL), | |
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246 _collection_set_size(0), |
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247 _collection_set_bytes_used_before(0), |
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248 |
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249 // Incremental CSet attributes |
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250 _inc_cset_build_state(Inactive), |
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251 _inc_cset_head(NULL), |
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252 _inc_cset_tail(NULL), |
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253 _inc_cset_size(0), |
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254 _inc_cset_young_index(0), |
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255 _inc_cset_bytes_used_before(0), |
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256 _inc_cset_max_finger(NULL), |
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257 _inc_cset_recorded_young_bytes(0), |
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258 _inc_cset_recorded_rs_lengths(0), |
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259 _inc_cset_predicted_elapsed_time_ms(0.0), |
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260 _inc_cset_predicted_bytes_to_copy(0), |
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261 |
342 | 262 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
263 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
264 #endif // _MSC_VER | |
265 | |
266 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
267 G1YoungSurvRateNumRegionsSummary)), | |
268 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 269 G1YoungSurvRateNumRegionsSummary)), |
342 | 270 // add here any more surv rate groups |
545 | 271 _recorded_survivor_regions(0), |
272 _recorded_survivor_head(NULL), | |
273 _recorded_survivor_tail(NULL), | |
1356 | 274 _survivors_age_table(true), |
275 | |
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276 _gc_overhead_perc(0.0) { |
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277 |
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278 // Set up the region size and associated fields. Given that the |
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279 // policy is created before the heap, we have to set this up here, |
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280 // so it's done as soon as possible. |
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281 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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282 HeapRegionRemSet::setup_remset_size(); |
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283 |
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284 G1ErgoVerbose::initialize(); |
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285 if (PrintAdaptiveSizePolicy) { |
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286 // Currently, we only use a single switch for all the heuristics. |
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287 G1ErgoVerbose::set_enabled(true); |
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288 // Given that we don't currently have a verboseness level |
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289 // parameter, we'll hardcode this to high. This can be easily |
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290 // changed in the future. |
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291 G1ErgoVerbose::set_level(ErgoHigh); |
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292 } else { |
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293 G1ErgoVerbose::set_enabled(false); |
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294 } |
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295 |
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296 // Verify PLAB sizes |
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297 const size_t region_size = HeapRegion::GrainWords; |
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298 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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299 char buffer[128]; |
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300 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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301 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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302 vm_exit_during_initialization(buffer); |
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303 } |
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304 |
342 | 305 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
306 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
307 | |
1611 | 308 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 309 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
310 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
311 | |
312 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
313 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
314 | |
315 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
316 | |
317 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
318 | |
319 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 320 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
321 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 322 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
342 | 323 |
324 // start conservatively | |
751 | 325 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 326 |
327 // <NEW PREDICTION> | |
328 | |
329 int index; | |
330 if (ParallelGCThreads == 0) | |
331 index = 0; | |
332 else if (ParallelGCThreads > 8) | |
333 index = 7; | |
334 else | |
335 index = ParallelGCThreads - 1; | |
336 | |
337 _pending_card_diff_seq->add(0.0); | |
338 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
339 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
340 _fully_young_cards_per_entry_ratio_seq->add( | |
341 fully_young_cards_per_entry_ratio_defaults[index]); | |
342 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
343 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
344 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
345 _young_other_cost_per_region_ms_seq->add( | |
346 young_other_cost_per_region_ms_defaults[index]); | |
347 _non_young_other_cost_per_region_ms_seq->add( | |
348 non_young_other_cost_per_region_ms_defaults[index]); | |
349 | |
350 // </NEW PREDICTION> | |
351 | |
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352 // Below, we might need to calculate the pause time target based on |
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353 // the pause interval. When we do so we are going to give G1 maximum |
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354 // flexibility and allow it to do pauses when it needs to. So, we'll |
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355 // arrange that the pause interval to be pause time target + 1 to |
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356 // ensure that a) the pause time target is maximized with respect to |
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357 // the pause interval and b) we maintain the invariant that pause |
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358 // time target < pause interval. If the user does not want this |
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359 // maximum flexibility, they will have to set the pause interval |
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360 // explicitly. |
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361 |
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362 // First make sure that, if either parameter is set, its value is |
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363 // reasonable. |
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364 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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365 if (MaxGCPauseMillis < 1) { |
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366 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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367 "greater than 0"); |
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368 } |
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369 } |
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370 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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371 if (GCPauseIntervalMillis < 1) { |
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372 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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373 "greater than 0"); |
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374 } |
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375 } |
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376 |
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377 // Then, if the pause time target parameter was not set, set it to |
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378 // the default value. |
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379 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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380 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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381 // The default pause time target in G1 is 200ms |
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382 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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383 } else { |
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384 // We do not allow the pause interval to be set without the |
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385 // pause time target |
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386 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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387 "without setting MaxGCPauseMillis"); |
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388 } |
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389 } |
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390 |
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391 // Then, if the interval parameter was not set, set it according to |
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392 // the pause time target (this will also deal with the case when the |
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393 // pause time target is the default value). |
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394 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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395 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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396 } |
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397 |
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398 // Finally, make sure that the two parameters are consistent. |
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399 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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400 char buffer[256]; |
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401 jio_snprintf(buffer, 256, |
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402 "MaxGCPauseMillis (%u) should be less than " |
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403 "GCPauseIntervalMillis (%u)", |
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404 MaxGCPauseMillis, GCPauseIntervalMillis); |
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405 vm_exit_during_initialization(buffer); |
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406 } |
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407 |
751 | 408 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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409 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 410 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 411 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 412 |
413 // start conservatively (around 50ms is about right) | |
414 _concurrent_mark_remark_times_ms->add(0.05); | |
415 _concurrent_mark_cleanup_times_ms->add(0.20); | |
416 _tenuring_threshold = MaxTenuringThreshold; | |
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417 // _max_survivor_regions will be calculated by |
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418 // update_young_list_target_length() during initialization. |
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419 _max_survivor_regions = 0; |
545 | 420 |
1356 | 421 assert(GCTimeRatio > 0, |
422 "we should have set it to a default value set_g1_gc_flags() " | |
423 "if a user set it to 0"); | |
424 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
425 | |
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426 uintx reserve_perc = G1ReservePercent; |
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427 // Put an artificial ceiling on this so that it's not set to a silly value. |
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428 if (reserve_perc > 50) { |
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429 reserve_perc = 50; |
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430 warning("G1ReservePercent is set to a value that is too large, " |
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431 "it's been updated to %u", reserve_perc); |
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432 } |
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433 _reserve_factor = (double) reserve_perc / 100.0; |
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434 // This will be set when the heap is expanded |
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435 // for the first time during initialization. |
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436 _reserve_regions = 0; |
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437 |
342 | 438 initialize_all(); |
4013 | 439 _collectionSetChooser = new CollectionSetChooser(); |
342 | 440 } |
441 | |
442 // Increment "i", mod "len" | |
443 static void inc_mod(int& i, int len) { | |
444 i++; if (i == len) i = 0; | |
445 } | |
446 | |
447 void G1CollectorPolicy::initialize_flags() { | |
448 set_min_alignment(HeapRegion::GrainBytes); | |
449 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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450 if (SurvivorRatio < 1) { |
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451 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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452 } |
342 | 453 CollectorPolicy::initialize_flags(); |
454 } | |
455 | |
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456 // The easiest way to deal with the parsing of the NewSize / |
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457 // MaxNewSize / etc. parameteres is to re-use the code in the |
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458 // TwoGenerationCollectorPolicy class. This is similar to what |
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459 // ParallelScavenge does with its GenerationSizer class (see |
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460 // ParallelScavengeHeap::initialize()). We might change this in the |
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461 // future, but it's a good start. |
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462 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
3976 | 463 private: |
464 size_t size_to_region_num(size_t byte_size) { | |
465 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); | |
466 } | |
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467 |
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468 public: |
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469 G1YoungGenSizer() { |
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470 initialize_flags(); |
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471 initialize_size_info(); |
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472 } |
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473 size_t min_young_region_num() { |
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474 return size_to_region_num(_min_gen0_size); |
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475 } |
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476 size_t initial_young_region_num() { |
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477 return size_to_region_num(_initial_gen0_size); |
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478 } |
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479 size_t max_young_region_num() { |
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480 return size_to_region_num(_max_gen0_size); |
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481 } |
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482 }; |
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483 |
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484 void G1CollectorPolicy::update_young_list_size_using_newratio(size_t number_of_heap_regions) { |
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485 assert(number_of_heap_regions > 0, "Heap must be initialized"); |
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486 size_t young_size = number_of_heap_regions / (NewRatio + 1); |
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487 _min_desired_young_length = young_size; |
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488 _max_desired_young_length = young_size; |
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489 } |
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490 |
342 | 491 void G1CollectorPolicy::init() { |
492 // Set aside an initial future to_space. | |
493 _g1 = G1CollectedHeap::heap(); | |
494 | |
495 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
496 | |
545 | 497 initialize_gc_policy_counters(); |
498 | |
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499 G1YoungGenSizer sizer; |
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500 size_t initial_region_num = sizer.initial_young_region_num(); |
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501 _min_desired_young_length = sizer.min_young_region_num(); |
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502 _max_desired_young_length = sizer.max_young_region_num(); |
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503 |
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504 if (FLAG_IS_CMDLINE(NewRatio)) { |
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505 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
3976 | 506 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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507 } else { |
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508 // Treat NewRatio as a fixed size that is only recalculated when the heap size changes |
3976 | 509 update_young_list_size_using_newratio(_g1->n_regions()); |
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510 _using_new_ratio_calculations = true; |
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511 } |
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512 } |
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513 |
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514 // GenCollectorPolicy guarantees that min <= initial <= max. |
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515 // Asserting here just to state that we rely on this property. |
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516 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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517 assert(initial_region_num <= _max_desired_young_length, "Initial young gen size too large"); |
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518 assert(_min_desired_young_length <= initial_region_num, "Initial young gen size too small"); |
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519 |
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520 set_adaptive_young_list_length(_min_desired_young_length < _max_desired_young_length); |
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521 if (adaptive_young_list_length()) { |
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522 _young_list_fixed_length = 0; |
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523 } else { |
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524 _young_list_fixed_length = initial_region_num; |
342 | 525 } |
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526 _free_regions_at_end_of_collection = _g1->free_regions(); |
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527 update_young_list_target_length(); |
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528 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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529 |
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530 // We may immediately start allocating regions and placing them on the |
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531 // collection set list. Initialize the per-collection set info |
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532 start_incremental_cset_building(); |
342 | 533 } |
534 | |
545 | 535 // Create the jstat counters for the policy. |
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536 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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537 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 538 } |
539 | |
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540 bool G1CollectorPolicy::predict_will_fit(size_t young_length, |
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541 double base_time_ms, |
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542 size_t base_free_regions, |
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543 double target_pause_time_ms) { |
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544 if (young_length >= base_free_regions) { |
342 | 545 // end condition 1: not enough space for the young regions |
546 return false; | |
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547 } |
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548 |
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549 double accum_surv_rate = accum_yg_surv_rate_pred((int)(young_length - 1)); |
342 | 550 size_t bytes_to_copy = |
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551 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 552 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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553 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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554 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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555 if (pause_time_ms > target_pause_time_ms) { |
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556 // end condition 2: prediction is over the target pause time |
342 | 557 return false; |
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558 } |
342 | 559 |
560 size_t free_bytes = | |
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561 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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562 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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563 // end condition 3: out-of-space (conservatively!) |
342 | 564 return false; |
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565 } |
342 | 566 |
567 // success! | |
568 return true; | |
569 } | |
570 | |
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571 void G1CollectorPolicy::record_new_heap_size(size_t new_number_of_regions) { |
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572 // re-calculate the necessary reserve |
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573 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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574 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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575 // smaller than 1.0) we'll get 1. |
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576 _reserve_regions = (size_t) ceil(reserve_regions_d); |
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577 |
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578 if (_using_new_ratio_calculations) { |
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579 // -XX:NewRatio was specified so we need to update the |
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580 // young gen length when the heap size has changed. |
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581 update_young_list_size_using_newratio(new_number_of_regions); |
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582 } |
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583 } |
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584 |
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585 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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586 size_t base_min_length) { |
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587 size_t desired_min_length = 0; |
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588 if (adaptive_young_list_length()) { |
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589 if (_alloc_rate_ms_seq->num() > 3) { |
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590 double now_sec = os::elapsedTime(); |
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591 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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592 double alloc_rate_ms = predict_alloc_rate_ms(); |
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593 desired_min_length = (size_t) ceil(alloc_rate_ms * when_ms); |
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594 } else { |
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595 // otherwise we don't have enough info to make the prediction |
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596 } |
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597 } |
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598 desired_min_length += base_min_length; |
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599 // make sure we don't go below any user-defined minimum bound |
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600 return MAX2(_min_desired_young_length, desired_min_length); |
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601 } |
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602 |
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603 size_t G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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604 // Here, we might want to also take into account any additional |
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605 // constraints (i.e., user-defined minimum bound). Currently, we |
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606 // effectively don't set this bound. |
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607 return _max_desired_young_length; |
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608 } |
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609 |
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610 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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611 if (rs_lengths == (size_t) -1) { |
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612 // if it's set to the default value (-1), we should predict it; |
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613 // otherwise, use the given value. |
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614 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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615 } |
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616 |
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617 // Calculate the absolute and desired min bounds. |
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618 |
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619 // This is how many young regions we already have (currently: the survivors). |
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620 size_t base_min_length = recorded_survivor_regions(); |
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621 // This is the absolute minimum young length, which ensures that we |
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622 // can allocate one eden region in the worst-case. |
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623 size_t absolute_min_length = base_min_length + 1; |
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624 size_t desired_min_length = |
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625 calculate_young_list_desired_min_length(base_min_length); |
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626 if (desired_min_length < absolute_min_length) { |
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627 desired_min_length = absolute_min_length; |
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628 } |
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629 |
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630 // Calculate the absolute and desired max bounds. |
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631 |
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632 // We will try our best not to "eat" into the reserve. |
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633 size_t absolute_max_length = 0; |
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634 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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635 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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636 } |
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637 size_t desired_max_length = calculate_young_list_desired_max_length(); |
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638 if (desired_max_length > absolute_max_length) { |
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639 desired_max_length = absolute_max_length; |
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640 } |
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641 |
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642 size_t young_list_target_length = 0; |
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643 if (adaptive_young_list_length()) { |
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644 if (full_young_gcs()) { |
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645 young_list_target_length = |
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646 calculate_young_list_target_length(rs_lengths, |
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647 base_min_length, |
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648 desired_min_length, |
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649 desired_max_length); |
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650 _rs_lengths_prediction = rs_lengths; |
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651 } else { |
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652 // Don't calculate anything and let the code below bound it to |
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653 // the desired_min_length, i.e., do the next GC as soon as |
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654 // possible to maximize how many old regions we can add to it. |
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655 } |
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656 } else { |
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657 if (full_young_gcs()) { |
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658 young_list_target_length = _young_list_fixed_length; |
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659 } else { |
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660 // A bit arbitrary: during partially-young GCs we allocate half |
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661 // the young regions to try to add old regions to the CSet. |
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662 young_list_target_length = _young_list_fixed_length / 2; |
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663 // We choose to accept that we might go under the desired min |
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664 // length given that we intentionally ask for a smaller young gen. |
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665 desired_min_length = absolute_min_length; |
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666 } |
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667 } |
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668 |
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669 // Make sure we don't go over the desired max length, nor under the |
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670 // desired min length. In case they clash, desired_min_length wins |
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671 // which is why that test is second. |
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672 if (young_list_target_length > desired_max_length) { |
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673 young_list_target_length = desired_max_length; |
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674 } |
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675 if (young_list_target_length < desired_min_length) { |
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676 young_list_target_length = desired_min_length; |
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677 } |
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678 |
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679 assert(young_list_target_length > recorded_survivor_regions(), |
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680 "we should be able to allocate at least one eden region"); |
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681 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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682 _young_list_target_length = young_list_target_length; |
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683 |
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684 update_max_gc_locker_expansion(); |
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685 } |
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686 |
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687 size_t |
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688 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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689 size_t base_min_length, |
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690 size_t desired_min_length, |
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691 size_t desired_max_length) { |
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692 assert(adaptive_young_list_length(), "pre-condition"); |
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693 assert(full_young_gcs(), "only call this for fully-young GCs"); |
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694 |
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695 // In case some edge-condition makes the desired max length too small... |
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696 if (desired_max_length <= desired_min_length) { |
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697 return desired_min_length; |
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698 } |
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699 |
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700 // We'll adjust min_young_length and max_young_length not to include |
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701 // the already allocated young regions (i.e., so they reflect the |
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702 // min and max eden regions we'll allocate). The base_min_length |
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703 // will be reflected in the predictions by the |
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704 // survivor_regions_evac_time prediction. |
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705 assert(desired_min_length > base_min_length, "invariant"); |
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706 size_t min_young_length = desired_min_length - base_min_length; |
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707 assert(desired_max_length > base_min_length, "invariant"); |
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708 size_t max_young_length = desired_max_length - base_min_length; |
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709 |
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710 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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711 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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712 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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713 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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714 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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715 double base_time_ms = |
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716 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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717 survivor_regions_evac_time; |
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718 size_t available_free_regions = _free_regions_at_end_of_collection; |
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719 size_t base_free_regions = 0; |
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720 if (available_free_regions > _reserve_regions) { |
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721 base_free_regions = available_free_regions - _reserve_regions; |
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722 } |
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723 |
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724 // Here, we will make sure that the shortest young length that |
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725 // makes sense fits within the target pause time. |
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726 |
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727 if (predict_will_fit(min_young_length, base_time_ms, |
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728 base_free_regions, target_pause_time_ms)) { |
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729 // The shortest young length will fit into the target pause time; |
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730 // we'll now check whether the absolute maximum number of young |
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731 // regions will fit in the target pause time. If not, we'll do |
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732 // a binary search between min_young_length and max_young_length. |
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733 if (predict_will_fit(max_young_length, base_time_ms, |
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734 base_free_regions, target_pause_time_ms)) { |
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735 // The maximum young length will fit into the target pause time. |
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736 // We are done so set min young length to the maximum length (as |
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737 // the result is assumed to be returned in min_young_length). |
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738 min_young_length = max_young_length; |
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739 } else { |
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740 // The maximum possible number of young regions will not fit within |
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741 // the target pause time so we'll search for the optimal |
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742 // length. The loop invariants are: |
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743 // |
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744 // min_young_length < max_young_length |
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745 // min_young_length is known to fit into the target pause time |
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746 // max_young_length is known not to fit into the target pause time |
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747 // |
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748 // Going into the loop we know the above hold as we've just |
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749 // checked them. Every time around the loop we check whether |
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750 // the middle value between min_young_length and |
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751 // max_young_length fits into the target pause time. If it |
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752 // does, it becomes the new min. If it doesn't, it becomes |
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753 // the new max. This way we maintain the loop invariants. |
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754 |
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755 assert(min_young_length < max_young_length, "invariant"); |
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756 size_t diff = (max_young_length - min_young_length) / 2; |
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757 while (diff > 0) { |
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758 size_t young_length = min_young_length + diff; |
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759 if (predict_will_fit(young_length, base_time_ms, |
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760 base_free_regions, target_pause_time_ms)) { |
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761 min_young_length = young_length; |
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762 } else { |
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763 max_young_length = young_length; |
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764 } |
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765 assert(min_young_length < max_young_length, "invariant"); |
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766 diff = (max_young_length - min_young_length) / 2; |
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767 } |
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768 // The results is min_young_length which, according to the |
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769 // loop invariants, should fit within the target pause time. |
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770 |
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771 // These are the post-conditions of the binary search above: |
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772 assert(min_young_length < max_young_length, |
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773 "otherwise we should have discovered that max_young_length " |
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774 "fits into the pause target and not done the binary search"); |
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775 assert(predict_will_fit(min_young_length, base_time_ms, |
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776 base_free_regions, target_pause_time_ms), |
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777 "min_young_length, the result of the binary search, should " |
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778 "fit into the pause target"); |
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779 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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780 base_free_regions, target_pause_time_ms), |
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781 "min_young_length, the result of the binary search, should be " |
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782 "optimal, so no larger length should fit into the pause target"); |
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783 } |
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784 } else { |
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785 // Even the minimum length doesn't fit into the pause time |
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786 // target, return it as the result nevertheless. |
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787 } |
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788 return base_min_length + min_young_length; |
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789 } |
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790 |
545 | 791 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
792 double survivor_regions_evac_time = 0.0; | |
793 for (HeapRegion * r = _recorded_survivor_head; | |
794 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
795 r = r->get_next_young_region()) { | |
796 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
797 } | |
798 return survivor_regions_evac_time; | |
799 } | |
800 | |
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801 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 802 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
803 | |
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804 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 805 if (rs_lengths > _rs_lengths_prediction) { |
806 // add 10% to avoid having to recalculate often | |
807 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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808 update_young_list_target_length(rs_lengths_prediction); |
342 | 809 } |
810 } | |
811 | |
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812 |
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813 |
342 | 814 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
815 bool is_tlab, | |
816 bool* gc_overhead_limit_was_exceeded) { | |
817 guarantee(false, "Not using this policy feature yet."); | |
818 return NULL; | |
819 } | |
820 | |
821 // This method controls how a collector handles one or more | |
822 // of its generations being fully allocated. | |
823 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
824 bool is_tlab) { | |
825 guarantee(false, "Not using this policy feature yet."); | |
826 return NULL; | |
827 } | |
828 | |
829 | |
830 #ifndef PRODUCT | |
831 bool G1CollectorPolicy::verify_young_ages() { | |
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832 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 833 return |
834 verify_young_ages(head, _short_lived_surv_rate_group); | |
835 // also call verify_young_ages on any additional surv rate groups | |
836 } | |
837 | |
838 bool | |
839 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
840 SurvRateGroup *surv_rate_group) { | |
841 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
842 | |
843 const char* name = surv_rate_group->name(); | |
844 bool ret = true; | |
845 int prev_age = -1; | |
846 | |
847 for (HeapRegion* curr = head; | |
848 curr != NULL; | |
849 curr = curr->get_next_young_region()) { | |
850 SurvRateGroup* group = curr->surv_rate_group(); | |
851 if (group == NULL && !curr->is_survivor()) { | |
852 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
853 ret = false; | |
854 } | |
855 | |
856 if (surv_rate_group == group) { | |
857 int age = curr->age_in_surv_rate_group(); | |
858 | |
859 if (age < 0) { | |
860 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
861 ret = false; | |
862 } | |
863 | |
864 if (age <= prev_age) { | |
865 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
866 "(%d, %d)", name, age, prev_age); | |
867 ret = false; | |
868 } | |
869 prev_age = age; | |
870 } | |
871 } | |
872 | |
873 return ret; | |
874 } | |
875 #endif // PRODUCT | |
876 | |
877 void G1CollectorPolicy::record_full_collection_start() { | |
878 _cur_collection_start_sec = os::elapsedTime(); | |
879 // Release the future to-space so that it is available for compaction into. | |
880 _g1->set_full_collection(); | |
881 } | |
882 | |
883 void G1CollectorPolicy::record_full_collection_end() { | |
884 // Consider this like a collection pause for the purposes of allocation | |
885 // since last pause. | |
886 double end_sec = os::elapsedTime(); | |
887 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
888 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
889 | |
890 _all_full_gc_times_ms->add(full_gc_time_ms); | |
891 | |
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892 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 893 |
894 _g1->clear_full_collection(); | |
895 | |
896 // "Nuke" the heuristics that control the fully/partially young GC | |
897 // transitions and make sure we start with fully young GCs after the | |
898 // Full GC. | |
899 set_full_young_gcs(true); | |
900 _last_full_young_gc = false; | |
901 _should_revert_to_full_young_gcs = false; | |
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902 clear_initiate_conc_mark_if_possible(); |
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903 clear_during_initial_mark_pause(); |
342 | 904 _known_garbage_bytes = 0; |
905 _known_garbage_ratio = 0.0; | |
906 _in_marking_window = false; | |
907 _in_marking_window_im = false; | |
908 | |
909 _short_lived_surv_rate_group->start_adding_regions(); | |
910 // also call this on any additional surv rate groups | |
911 | |
545 | 912 record_survivor_regions(0, NULL, NULL); |
913 | |
342 | 914 _prev_region_num_young = _region_num_young; |
915 _prev_region_num_tenured = _region_num_tenured; | |
916 | |
917 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 918 // Reset survivors SurvRateGroup. |
919 _survivor_surv_rate_group->reset(); | |
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920 update_young_list_target_length(); |
4013 | 921 _collectionSetChooser->updateAfterFullCollection(); |
1973 | 922 } |
342 | 923 |
924 void G1CollectorPolicy::record_stop_world_start() { | |
925 _stop_world_start = os::elapsedTime(); | |
926 } | |
927 | |
928 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
929 size_t start_used) { | |
930 if (PrintGCDetails) { | |
931 gclog_or_tty->stamp(PrintGCTimeStamps); | |
932 gclog_or_tty->print("[GC pause"); | |
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933 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
342 | 934 } |
935 | |
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936 // We only need to do this here as the policy will only be applied |
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937 // to the GC we're about to start. so, no point is calculating this |
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938 // every time we calculate / recalculate the target young length. |
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939 update_survivors_policy(); |
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940 |
1973 | 941 assert(_g1->used() == _g1->recalculate_used(), |
942 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
943 _g1->used(), _g1->recalculate_used())); | |
342 | 944 |
945 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
946 _all_stop_world_times_ms->add(s_w_t_ms); | |
947 _stop_world_start = 0.0; | |
948 | |
949 _cur_collection_start_sec = start_time_sec; | |
950 _cur_collection_pause_used_at_start_bytes = start_used; | |
951 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
952 _pending_cards = _g1->pending_card_num(); | |
953 _max_pending_cards = _g1->max_pending_card_num(); | |
954 | |
955 _bytes_in_collection_set_before_gc = 0; | |
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956 _bytes_copied_during_gc = 0; |
342 | 957 |
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958 YoungList* young_list = _g1->young_list(); |
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959 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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960 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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961 _capacity_before_gc = _g1->capacity(); |
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962 |
342 | 963 #ifdef DEBUG |
964 // initialise these to something well known so that we can spot | |
965 // if they are not set properly | |
966 | |
967 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 968 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
969 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
970 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
971 _par_last_update_rs_times_ms[i] = -1234.0; | |
972 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
973 _par_last_scan_rs_times_ms[i] = -1234.0; | |
974 _par_last_obj_copy_times_ms[i] = -1234.0; | |
975 _par_last_termination_times_ms[i] = -1234.0; | |
976 _par_last_termination_attempts[i] = -1234.0; | |
977 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 978 _par_last_gc_worker_times_ms[i] = -1234.0; |
342 | 979 } |
980 #endif | |
981 | |
982 for (int i = 0; i < _aux_num; ++i) { | |
983 _cur_aux_times_ms[i] = 0.0; | |
984 _cur_aux_times_set[i] = false; | |
985 } | |
986 | |
987 _satb_drain_time_set = false; | |
988 _last_satb_drain_processed_buffers = -1; | |
989 | |
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990 _last_young_gc_full = false; |
342 | 991 |
992 // do that for any other surv rate groups | |
993 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 994 _survivors_age_table.clear(); |
545 | 995 |
342 | 996 assert( verify_young_ages(), "region age verification" ); |
997 } | |
998 | |
999 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
1000 _mark_closure_time_ms = mark_closure_time_ms; | |
1001 } | |
1002 | |
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1003 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 1004 mark_init_elapsed_time_ms) { |
1005 _during_marking = true; | |
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1006 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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1007 clear_during_initial_mark_pause(); |
342 | 1008 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
1009 } | |
1010 | |
1011 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
1012 _mark_remark_start_sec = os::elapsedTime(); | |
1013 _during_marking = false; | |
1014 } | |
1015 | |
1016 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
1017 double end_time_sec = os::elapsedTime(); | |
1018 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
1019 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
1020 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1021 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1022 | |
1023 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
1024 } | |
1025 | |
1026 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
1027 _mark_cleanup_start_sec = os::elapsedTime(); | |
1028 } | |
1029 | |
4013 | 1030 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
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1031 _should_revert_to_full_young_gcs = false; |
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1032 _last_full_young_gc = true; |
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1033 _in_marking_window = false; |
342 | 1034 } |
1035 | |
1036 void G1CollectorPolicy::record_concurrent_pause() { | |
1037 if (_stop_world_start > 0.0) { | |
1038 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1039 _all_yield_times_ms->add(yield_ms); | |
1040 } | |
1041 } | |
1042 | |
1043 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1044 } | |
1045 | |
1046 template<class T> | |
1047 T sum_of(T* sum_arr, int start, int n, int N) { | |
1048 T sum = (T)0; | |
1049 for (int i = 0; i < n; i++) { | |
1050 int j = (start + i) % N; | |
1051 sum += sum_arr[j]; | |
1052 } | |
1053 return sum; | |
1054 } | |
1055 | |
1611 | 1056 void G1CollectorPolicy::print_par_stats(int level, |
1057 const char* str, | |
2430 | 1058 double* data) { |
342 | 1059 double min = data[0], max = data[0]; |
1060 double total = 0.0; | |
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1061 LineBuffer buf(level); |
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1062 buf.append("[%s (ms):", str); |
342 | 1063 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1064 double val = data[i]; | |
1065 if (val < min) | |
1066 min = val; | |
1067 if (val > max) | |
1068 max = val; | |
1069 total += val; | |
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1070 buf.append(" %3.1lf", val); |
342 | 1071 } |
2430 | 1072 buf.append_and_print_cr(""); |
1073 double avg = total / (double) ParallelGCThreads; | |
1074 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
1075 avg, min, max, max - min); | |
342 | 1076 } |
1077 | |
1611 | 1078 void G1CollectorPolicy::print_par_sizes(int level, |
1079 const char* str, | |
2430 | 1080 double* data) { |
342 | 1081 double min = data[0], max = data[0]; |
1082 double total = 0.0; | |
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1083 LineBuffer buf(level); |
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1084 buf.append("[%s :", str); |
342 | 1085 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1086 double val = data[i]; | |
1087 if (val < min) | |
1088 min = val; | |
1089 if (val > max) | |
1090 max = val; | |
1091 total += val; | |
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1092 buf.append(" %d", (int) val); |
342 | 1093 } |
2430 | 1094 buf.append_and_print_cr(""); |
1095 double avg = total / (double) ParallelGCThreads; | |
1096 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
1097 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1098 } |
1099 | |
1100 void G1CollectorPolicy::print_stats (int level, | |
1101 const char* str, | |
1102 double value) { | |
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1103 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1104 } |
1105 | |
1106 void G1CollectorPolicy::print_stats (int level, | |
1107 const char* str, | |
1108 int value) { | |
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1109 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1110 } |
1111 | |
1112 double G1CollectorPolicy::avg_value (double* data) { | |
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1113 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1114 double ret = 0.0; |
1115 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1116 ret += data[i]; | |
1117 return ret / (double) ParallelGCThreads; | |
1118 } else { | |
1119 return data[0]; | |
1120 } | |
1121 } | |
1122 | |
1123 double G1CollectorPolicy::max_value (double* data) { | |
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1124 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1125 double ret = data[0]; |
1126 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1127 if (data[i] > ret) | |
1128 ret = data[i]; | |
1129 return ret; | |
1130 } else { | |
1131 return data[0]; | |
1132 } | |
1133 } | |
1134 | |
1135 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1136 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1137 double sum = 0.0; |
1138 for (uint i = 0; i < ParallelGCThreads; i++) | |
1139 sum += data[i]; | |
1140 return sum; | |
1141 } else { | |
1142 return data[0]; | |
1143 } | |
1144 } | |
1145 | |
1146 double G1CollectorPolicy::max_sum (double* data1, | |
1147 double* data2) { | |
1148 double ret = data1[0] + data2[0]; | |
1149 | |
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1150 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1151 for (uint i = 1; i < ParallelGCThreads; ++i) { |
1152 double data = data1[i] + data2[i]; | |
1153 if (data > ret) | |
1154 ret = data; | |
1155 } | |
1156 } | |
1157 return ret; | |
1158 } | |
1159 | |
1160 // Anything below that is considered to be zero | |
1161 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1162 | |
1707 | 1163 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1164 double end_time_sec = os::elapsedTime(); |
1165 double elapsed_ms = _last_pause_time_ms; | |
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1166 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1167 size_t rs_size = |
1168 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1169 size_t cur_used_bytes = _g1->used(); | |
1170 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1171 bool last_pause_included_initial_mark = false; | |
1707 | 1172 bool update_stats = !_g1->evacuation_failed(); |
342 | 1173 |
1174 #ifndef PRODUCT | |
1175 if (G1YoungSurvRateVerbose) { | |
1176 gclog_or_tty->print_cr(""); | |
1177 _short_lived_surv_rate_group->print(); | |
1178 // do that for any other surv rate groups too | |
1179 } | |
1180 #endif // PRODUCT | |
1181 | |
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1182 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1183 if (last_pause_included_initial_mark) |
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1184 record_concurrent_mark_init_end(0.0); |
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1185 |
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1186 size_t marking_initiating_used_threshold = |
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1187 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1188 |
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1189 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1190 assert(!last_pause_included_initial_mark, "invariant"); |
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1191 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1192 if (cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1193 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1194 |
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1195 ergo_verbose3(ErgoConcCycles, |
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1196 "request concurrent cycle initiation", |
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1197 ergo_format_reason("occupancy higher than threshold") |
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1198 ergo_format_byte("occupancy") |
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1199 ergo_format_byte_perc("threshold"), |
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1200 cur_used_bytes, |
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1201 marking_initiating_used_threshold, |
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1202 (double) InitiatingHeapOccupancyPercent); |
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1203 |
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1204 // Note: this might have already been set, if during the last |
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1205 // pause we decided to start a cycle but at the beginning of |
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1206 // this pause we decided to postpone it. That's OK. |
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1207 set_initiate_conc_mark_if_possible(); |
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1208 } else { |
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1209 ergo_verbose2(ErgoConcCycles, |
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1210 "do not request concurrent cycle initiation", |
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1211 ergo_format_reason("occupancy lower than previous occupancy") |
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1212 ergo_format_byte("occupancy") |
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1213 ergo_format_byte("previous occupancy"), |
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1214 cur_used_bytes, |
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1215 _prev_collection_pause_used_at_end_bytes); |
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1216 } |
342 | 1217 } |
1218 } | |
1219 | |
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1220 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1221 |
342 | 1222 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1223 end_time_sec, false); | |
1224 | |
1225 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1226 collection_set_size(), | |
1227 "Negative RS size?"); | |
1228 | |
1229 // This assert is exempted when we're doing parallel collection pauses, | |
1230 // because the fragmentation caused by the parallel GC allocation buffers | |
1231 // can lead to more memory being used during collection than was used | |
1232 // before. Best leave this out until the fragmentation problem is fixed. | |
1233 // Pauses in which evacuation failed can also lead to negative | |
1234 // collections, since no space is reclaimed from a region containing an | |
1235 // object whose evacuation failed. | |
1236 // Further, we're now always doing parallel collection. But I'm still | |
1237 // leaving this here as a placeholder for a more precise assertion later. | |
1238 // (DLD, 10/05.) | |
1239 assert((true || parallel) // Always using GC LABs now. | |
1240 || _g1->evacuation_failed() | |
1241 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1242 "Negative collection"); | |
1243 | |
1244 size_t freed_bytes = | |
1245 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1246 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1247 |
342 | 1248 double survival_fraction = |
1249 (double)surviving_bytes/ | |
1250 (double)_collection_set_bytes_used_before; | |
1251 | |
1252 _n_pauses++; | |
1253 | |
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1254 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1255 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1256 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1257 double update_rs_processed_buffers = |
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1258 sum_of_values(_par_last_update_rs_processed_buffers); |
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1259 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1260 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1261 double termination_time = avg_value(_par_last_termination_times_ms); |
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1262 |
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1263 double parallel_known_time = update_rs_time + |
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1264 ext_root_scan_time + |
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1265 mark_stack_scan_time + |
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1266 scan_rs_time + |
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1267 obj_copy_time + |
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1268 termination_time; |
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1269 |
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1270 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; |
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1271 |
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1272 PauseSummary* summary = _summary; |
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1273 |
595
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1274 if (update_stats) { |
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1275 _recent_rs_scan_times_ms->add(scan_rs_time); |
342 | 1276 _recent_pause_times_ms->add(elapsed_ms); |
1277 _recent_rs_sizes->add(rs_size); | |
1278 | |
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1279 MainBodySummary* body_summary = summary->main_body_summary(); |
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1280 guarantee(body_summary != NULL, "should not be null!"); |
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1281 |
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1282 if (_satb_drain_time_set) |
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1283 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
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1284 else |
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1285 body_summary->record_satb_drain_time_ms(0.0); |
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1286 |
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1287 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1288 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1289 body_summary->record_update_rs_time_ms(update_rs_time); |
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1290 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1291 body_summary->record_obj_copy_time_ms(obj_copy_time); |
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1292 if (parallel) { |
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1293 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1294 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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1295 body_summary->record_termination_time_ms(termination_time); |
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1296 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1297 } |
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1298 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
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1299 |
342 | 1300 // We exempt parallel collection from this check because Alloc Buffer |
1301 // fragmentation can produce negative collections. Same with evac | |
1302 // failure. | |
1303 // Further, we're now always doing parallel collection. But I'm still | |
1304 // leaving this here as a placeholder for a more precise assertion later. | |
1305 // (DLD, 10/05. | |
1306 assert((true || parallel) | |
1307 || _g1->evacuation_failed() | |
1308 || surviving_bytes <= _collection_set_bytes_used_before, | |
1309 "Or else negative collection!"); | |
1310 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1311 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1312 | |
1313 // this is where we update the allocation rate of the application | |
1314 double app_time_ms = | |
1315 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1316 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1317 // This usually happens due to the timer not having the required | |
1318 // granularity. Some Linuxes are the usual culprits. | |
1319 // We'll just set it to something (arbitrarily) small. | |
1320 app_time_ms = 1.0; | |
1321 } | |
1322 size_t regions_allocated = | |
1323 (_region_num_young - _prev_region_num_young) + | |
1324 (_region_num_tenured - _prev_region_num_tenured); | |
1325 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1326 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1327 _prev_region_num_young = _region_num_young; | |
1328 _prev_region_num_tenured = _region_num_tenured; | |
1329 | |
1330 double interval_ms = | |
1331 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1332 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1333 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1334 if (recent_avg_pause_time_ratio() < 0.0 || |
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1335 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1336 #ifndef PRODUCT |
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1337 // Dump info to allow post-facto debugging |
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1338 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1339 gclog_or_tty->print_cr("-------------------------------------------"); |
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1340 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1341 _recent_gc_times_ms->dump(); |
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1342 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1343 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1344 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1345 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1346 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1347 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1348 #endif // !PRODUCT |
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1349 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1350 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1351 if (_recent_avg_pause_time_ratio < 0.0) { |
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1352 _recent_avg_pause_time_ratio = 0.0; |
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1353 } else { |
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1354 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1355 _recent_avg_pause_time_ratio = 1.0; |
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1356 } |
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1357 } |
342 | 1358 } |
1359 | |
1360 if (G1PolicyVerbose > 1) { | |
1361 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1362 } | |
1363 | |
1364 if (G1PolicyVerbose > 1) { | |
1365 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1366 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1367 " |RS|: " SIZE_FORMAT, | |
1368 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
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1369 scan_rs_time, recent_avg_time_for_rs_scan_ms(), |
342 | 1370 rs_size); |
1371 | |
1372 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1373 " At end " SIZE_FORMAT "K\n" | |
1374 " garbage : " SIZE_FORMAT "K" | |
1375 " of " SIZE_FORMAT "K\n" | |
1376 " survival : %6.2f%% (%6.2f%% avg)", | |
1377 _cur_collection_pause_used_at_start_bytes/K, | |
1378 _g1->used()/K, freed_bytes/K, | |
1379 _collection_set_bytes_used_before/K, | |
1380 survival_fraction*100.0, | |
1381 recent_avg_survival_fraction()*100.0); | |
1382 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1383 recent_avg_pause_time_ratio() * 100.0); | |
1384 } | |
1385 | |
1386 double other_time_ms = elapsed_ms; | |
1387 | |
1707 | 1388 if (_satb_drain_time_set) { |
1389 other_time_ms -= _cur_satb_drain_time_ms; | |
1390 } | |
1391 | |
1392 if (parallel) { | |
1393 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1394 } else { | |
1395 other_time_ms -= | |
1396 update_rs_time + | |
1397 ext_root_scan_time + mark_stack_scan_time + | |
1398 scan_rs_time + obj_copy_time; | |
342 | 1399 } |
1400 | |
1401 if (PrintGCDetails) { | |
1707 | 1402 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1403 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1404 elapsed_ms / 1000.0); | |
1405 | |
1707 | 1406 if (_satb_drain_time_set) { |
1407 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1408 } | |
1409 if (_last_satb_drain_processed_buffers >= 0) { | |
1410 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1411 } | |
1412 if (parallel) { | |
1413 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
2430 | 1414 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
1707 | 1415 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1416 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1417 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1418 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1707 | 1419 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1420 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1421 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1422 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1423 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
1424 | |
1425 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1426 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
1427 } | |
1428 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
1429 | |
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1430 print_stats(2, "Parallel Other", parallel_other_time); |
1707 | 1431 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
1432 } else { | |
1433 print_stats(1, "Update RS", update_rs_time); | |
1434 print_stats(2, "Processed Buffers", | |
1435 (int)update_rs_processed_buffers); | |
1436 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1437 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1438 print_stats(1, "Scan RS", scan_rs_time); | |
1439 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1440 } |
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|
1441 #ifndef PRODUCT |
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1442 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1443 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1444 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1445 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1446 if (_num_cc_clears > 0) { |
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|
1447 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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|
1448 } |
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1449 #endif |
342 | 1450 print_stats(1, "Other", other_time_ms); |
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1451 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1452 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1453 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1454 |
342 | 1455 for (int i = 0; i < _aux_num; ++i) { |
1456 if (_cur_aux_times_set[i]) { | |
1457 char buffer[96]; | |
1458 sprintf(buffer, "Aux%d", i); | |
1459 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1460 } | |
1461 } | |
1462 } | |
1463 | |
1464 _all_pause_times_ms->add(elapsed_ms); | |
648
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1465 if (update_stats) { |
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1466 summary->record_total_time_ms(elapsed_ms); |
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1467 summary->record_other_time_ms(other_time_ms); |
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1468 } |
342 | 1469 for (int i = 0; i < _aux_num; ++i) |
4013 | 1470 if (_cur_aux_times_set[i]) { |
342 | 1471 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); |
4013 | 1472 } |
342 | 1473 |
1474 // Update the efficiency-since-mark vars. | |
1475 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1476 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1477 // This usually happens due to the timer not having the required | |
1478 // granularity. Some Linuxes are the usual culprits. | |
1479 // We'll just set it to something (arbitrarily) small. | |
1480 proc_ms = 1.0; | |
1481 } | |
1482 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1483 | |
1484 bool new_in_marking_window = _in_marking_window; | |
1485 bool new_in_marking_window_im = false; | |
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1486 if (during_initial_mark_pause()) { |
342 | 1487 new_in_marking_window = true; |
1488 new_in_marking_window_im = true; | |
1489 } | |
1490 | |
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1491 if (_last_full_young_gc) { |
3982
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1492 if (!last_pause_included_initial_mark) { |
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1493 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1494 "start partially-young GCs", |
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1495 ergo_format_byte_perc("known garbage"), |
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1496 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1497 set_full_young_gcs(false); |
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1498 } else { |
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1499 ergo_verbose0(ErgoPartiallyYoungGCs, |
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1500 "do not start partially-young GCs", |
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1501 ergo_format_reason("concurrent cycle is about to start")); |
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1502 } |
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1503 _last_full_young_gc = false; |
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|
1504 } |
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1505 |
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1506 if ( !_last_young_gc_full ) { |
3914
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1507 if (_should_revert_to_full_young_gcs) { |
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1508 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1509 "end partially-young GCs", |
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1510 ergo_format_reason("partially-young GCs end requested") |
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|
1511 ergo_format_byte_perc("known garbage"), |
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1512 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1513 set_full_young_gcs(true); |
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1514 } else if (_known_garbage_ratio < 0.05) { |
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|
1515 ergo_verbose3(ErgoPartiallyYoungGCs, |
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|
1516 "end partially-young GCs", |
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|
1517 ergo_format_reason("known garbage percent lower than threshold") |
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|
1518 ergo_format_byte_perc("known garbage") |
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|
1519 ergo_format_perc("threshold"), |
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1520 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
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1521 0.05 * 100.0); |
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1522 set_full_young_gcs(true); |
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1523 } else if (adaptive_young_list_length() && |
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|
1524 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
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1525 ergo_verbose5(ErgoPartiallyYoungGCs, |
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1526 "end partially-young GCs", |
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1527 ergo_format_reason("current GC efficiency lower than " |
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1528 "predicted fully-young GC efficiency") |
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|
1529 ergo_format_double("GC efficiency factor") |
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|
1530 ergo_format_double("current GC efficiency") |
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|
1531 ergo_format_double("predicted fully-young GC efficiency") |
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|
1532 ergo_format_byte_perc("known garbage"), |
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|
1533 get_gc_eff_factor(), cur_efficiency, |
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|
1534 predict_young_gc_eff(), |
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|
1535 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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|
1536 set_full_young_gcs(true); |
342 | 1537 } |
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|
1538 } |
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1539 _should_revert_to_full_young_gcs = false; |
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1540 |
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1541 if (_last_young_gc_full && !_during_marking) { |
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1542 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1543 } |
1544 | |
1545 _short_lived_surv_rate_group->start_adding_regions(); | |
1546 // do that for any other surv rate groupsx | |
1547 | |
1548 // <NEW PREDICTION> | |
1549 | |
677 | 1550 if (update_stats) { |
342 | 1551 double pause_time_ms = elapsed_ms; |
1552 | |
1553 size_t diff = 0; | |
1554 if (_max_pending_cards >= _pending_cards) | |
1555 diff = _max_pending_cards - _pending_cards; | |
1556 _pending_card_diff_seq->add((double) diff); | |
1557 | |
1558 double cost_per_card_ms = 0.0; | |
1559 if (_pending_cards > 0) { | |
1560 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1561 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1562 } | |
1563 | |
1564 size_t cards_scanned = _g1->cards_scanned(); | |
1565 | |
1566 double cost_per_entry_ms = 0.0; | |
1567 if (cards_scanned > 10) { | |
1568 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1569 if (_last_young_gc_full) | |
1570 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1571 else | |
1572 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1573 } | |
1574 | |
1575 if (_max_rs_lengths > 0) { | |
1576 double cards_per_entry_ratio = | |
1577 (double) cards_scanned / (double) _max_rs_lengths; | |
1578 if (_last_young_gc_full) | |
1579 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1580 else | |
1581 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1582 } | |
1583 | |
1584 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1585 if (rs_length_diff >= 0) | |
1586 _rs_length_diff_seq->add((double) rs_length_diff); | |
1587 | |
1588 size_t copied_bytes = surviving_bytes; | |
1589 double cost_per_byte_ms = 0.0; | |
1590 if (copied_bytes > 0) { | |
1591 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1592 if (_in_marking_window) | |
1593 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1594 else | |
1595 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1596 } | |
1597 | |
1598 double all_other_time_ms = pause_time_ms - | |
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1599 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1600 _mark_closure_time_ms + termination_time); |
1601 | |
1602 double young_other_time_ms = 0.0; | |
1603 if (_recorded_young_regions > 0) { | |
1604 young_other_time_ms = | |
1605 _recorded_young_cset_choice_time_ms + | |
1606 _recorded_young_free_cset_time_ms; | |
1607 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1608 (double) _recorded_young_regions); | |
1609 } | |
1610 double non_young_other_time_ms = 0.0; | |
1611 if (_recorded_non_young_regions > 0) { | |
1612 non_young_other_time_ms = | |
1613 _recorded_non_young_cset_choice_time_ms + | |
1614 _recorded_non_young_free_cset_time_ms; | |
1615 | |
1616 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1617 (double) _recorded_non_young_regions); | |
1618 } | |
1619 | |
1620 double constant_other_time_ms = all_other_time_ms - | |
1621 (young_other_time_ms + non_young_other_time_ms); | |
1622 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1623 | |
1624 double survival_ratio = 0.0; | |
1625 if (_bytes_in_collection_set_before_gc > 0) { | |
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1626 survival_ratio = (double) _bytes_copied_during_gc / |
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1627 (double) _bytes_in_collection_set_before_gc; |
342 | 1628 } |
1629 | |
1630 _pending_cards_seq->add((double) _pending_cards); | |
1631 _scanned_cards_seq->add((double) cards_scanned); | |
1632 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1633 | |
1634 double expensive_region_limit_ms = | |
751 | 1635 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1636 if (expensive_region_limit_ms < 0.0) { |
1637 // this means that the other time was predicted to be longer than | |
1638 // than the max pause time | |
751 | 1639 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1640 } |
1641 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1642 | |
1643 if (PREDICTIONS_VERBOSE) { | |
1644 gclog_or_tty->print_cr(""); | |
1645 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1646 "REGIONS %d %d %d " |
342 | 1647 "PENDING_CARDS %d %d " |
1648 "CARDS_SCANNED %d %d " | |
1649 "RS_LENGTHS %d %d " | |
1650 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1651 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1652 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1653 "OTHER_YOUNG %1.6lf %1.6lf " | |
1654 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1655 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1656 "ELAPSED %1.6lf %1.6lf ", | |
1657 _cur_collection_start_sec, | |
1658 (!_last_young_gc_full) ? 2 : | |
1659 (last_pause_included_initial_mark) ? 1 : 0, | |
1660 _recorded_region_num, | |
1661 _recorded_young_regions, | |
1662 _recorded_non_young_regions, | |
1663 _predicted_pending_cards, _pending_cards, | |
1664 _predicted_cards_scanned, cards_scanned, | |
1665 _predicted_rs_lengths, _max_rs_lengths, | |
1666 _predicted_rs_update_time_ms, update_rs_time, | |
1667 _predicted_rs_scan_time_ms, scan_rs_time, | |
1668 _predicted_survival_ratio, survival_ratio, | |
1669 _predicted_object_copy_time_ms, obj_copy_time, | |
1670 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1671 _predicted_young_other_time_ms, young_other_time_ms, | |
1672 _predicted_non_young_other_time_ms, | |
1673 non_young_other_time_ms, | |
1674 _vtime_diff_ms, termination_time, | |
1675 _predicted_pause_time_ms, elapsed_ms); | |
1676 } | |
1677 | |
1678 if (G1PolicyVerbose > 0) { | |
1679 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1680 _predicted_pause_time_ms, | |
1681 (_within_target) ? "within" : "outside", | |
1682 elapsed_ms); | |
1683 } | |
1684 | |
1685 } | |
1686 | |
1687 _in_marking_window = new_in_marking_window; | |
1688 _in_marking_window_im = new_in_marking_window_im; | |
1689 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1690 update_young_list_target_length(); |
342 | 1691 |
1111 | 1692 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1693 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1694 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1695 // </NEW PREDICTION> |
4013 | 1696 |
1697 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1698 } |
1699 | |
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1700 #define EXT_SIZE_FORMAT "%d%s" |
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1701 #define EXT_SIZE_PARAMS(bytes) \ |
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1702 byte_size_in_proper_unit((bytes)), \ |
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1703 proper_unit_for_byte_size((bytes)) |
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1704 |
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1705 void G1CollectorPolicy::print_heap_transition() { |
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1706 if (PrintGCDetails) { |
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1707 YoungList* young_list = _g1->young_list(); |
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1708 size_t eden_bytes = young_list->eden_used_bytes(); |
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1709 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1710 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1711 size_t used = _g1->used(); |
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1712 size_t capacity = _g1->capacity(); |
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1713 size_t eden_capacity = |
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1714 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1715 |
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1716 gclog_or_tty->print_cr( |
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1717 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1718 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1719 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1720 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1721 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1722 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1723 EXT_SIZE_PARAMS(eden_bytes), |
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1724 EXT_SIZE_PARAMS(eden_capacity), |
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1725 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1726 EXT_SIZE_PARAMS(survivor_bytes), |
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1727 EXT_SIZE_PARAMS(used_before_gc), |
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1728 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1729 EXT_SIZE_PARAMS(used), |
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1730 EXT_SIZE_PARAMS(capacity)); |
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1731 |
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1732 _prev_eden_capacity = eden_capacity; |
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1733 } else if (PrintGC) { |
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1734 _g1->print_size_transition(gclog_or_tty, |
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1735 _cur_collection_pause_used_at_start_bytes, |
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1736 _g1->used(), _g1->capacity()); |
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1737 } |
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1738 } |
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1739 |
342 | 1740 // <NEW PREDICTION> |
1741 | |
1111 | 1742 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1743 double update_rs_processed_buffers, | |
1744 double goal_ms) { | |
1745 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1746 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1747 | |
1282 | 1748 if (G1UseAdaptiveConcRefinement) { |
1111 | 1749 const int k_gy = 3, k_gr = 6; |
1750 const double inc_k = 1.1, dec_k = 0.9; | |
1751 | |
1752 int g = cg1r->green_zone(); | |
1753 if (update_rs_time > goal_ms) { | |
1754 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1755 } else { | |
1756 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1757 g = (int)MAX2(g * inc_k, g + 1.0); | |
1758 } | |
1759 } | |
1760 // Change the refinement threads params | |
1761 cg1r->set_green_zone(g); | |
1762 cg1r->set_yellow_zone(g * k_gy); | |
1763 cg1r->set_red_zone(g * k_gr); | |
1764 cg1r->reinitialize_threads(); | |
1765 | |
1766 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1767 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1768 cg1r->yellow_zone()); | |
1769 // Change the barrier params | |
1770 dcqs.set_process_completed_threshold(processing_threshold); | |
1771 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1772 } | |
1773 | |
1774 int curr_queue_size = dcqs.completed_buffers_num(); | |
1775 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1776 dcqs.set_completed_queue_padding(curr_queue_size); | |
1777 } else { | |
1778 dcqs.set_completed_queue_padding(0); | |
1779 } | |
1780 dcqs.notify_if_necessary(); | |
1781 } | |
1782 | |
342 | 1783 double |
1784 G1CollectorPolicy:: | |
1785 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1786 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1787 | |
1788 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1789 size_t young_num = g1h->young_list()->length(); |
342 | 1790 if (young_num == 0) |
1791 return 0.0; | |
1792 | |
1793 young_num += adjustment; | |
1794 size_t pending_cards = predict_pending_cards(); | |
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1795 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1796 predict_rs_length_diff(); |
1797 size_t card_num; | |
1798 if (full_young_gcs()) | |
1799 card_num = predict_young_card_num(rs_lengths); | |
1800 else | |
1801 card_num = predict_non_young_card_num(rs_lengths); | |
1802 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1803 double accum_yg_surv_rate = | |
1804 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1805 | |
1806 size_t bytes_to_copy = | |
1807 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1808 | |
1809 return | |
1810 predict_rs_update_time_ms(pending_cards) + | |
1811 predict_rs_scan_time_ms(card_num) + | |
1812 predict_object_copy_time_ms(bytes_to_copy) + | |
1813 predict_young_other_time_ms(young_num) + | |
1814 predict_constant_other_time_ms(); | |
1815 } | |
1816 | |
1817 double | |
1818 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1819 size_t rs_length = predict_rs_length_diff(); | |
1820 size_t card_num; | |
1821 if (full_young_gcs()) | |
1822 card_num = predict_young_card_num(rs_length); | |
1823 else | |
1824 card_num = predict_non_young_card_num(rs_length); | |
1825 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1826 } | |
1827 | |
1828 double | |
1829 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1830 size_t scanned_cards) { | |
1831 return | |
1832 predict_rs_update_time_ms(pending_cards) + | |
1833 predict_rs_scan_time_ms(scanned_cards) + | |
1834 predict_constant_other_time_ms(); | |
1835 } | |
1836 | |
1837 double | |
1838 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1839 bool young) { | |
1840 size_t rs_length = hr->rem_set()->occupied(); | |
1841 size_t card_num; | |
1842 if (full_young_gcs()) | |
1843 card_num = predict_young_card_num(rs_length); | |
1844 else | |
1845 card_num = predict_non_young_card_num(rs_length); | |
1846 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1847 | |
1848 double region_elapsed_time_ms = | |
1849 predict_rs_scan_time_ms(card_num) + | |
1850 predict_object_copy_time_ms(bytes_to_copy); | |
1851 | |
1852 if (young) | |
1853 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1854 else | |
1855 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1856 | |
1857 return region_elapsed_time_ms; | |
1858 } | |
1859 | |
1860 size_t | |
1861 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1862 size_t bytes_to_copy; | |
1863 if (hr->is_marked()) | |
1864 bytes_to_copy = hr->max_live_bytes(); | |
1865 else { | |
1866 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1867 "invariant" ); | |
1868 int age = hr->age_in_surv_rate_group(); | |
545 | 1869 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1870 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1871 } | |
1872 | |
1873 return bytes_to_copy; | |
1874 } | |
1875 | |
1876 void | |
1877 G1CollectorPolicy::start_recording_regions() { | |
1878 _recorded_rs_lengths = 0; | |
1879 _recorded_young_regions = 0; | |
1880 _recorded_non_young_regions = 0; | |
1881 | |
1882 #if PREDICTIONS_VERBOSE | |
1883 _recorded_marked_bytes = 0; | |
1884 _recorded_young_bytes = 0; | |
1885 _predicted_bytes_to_copy = 0; | |
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1886 _predicted_rs_lengths = 0; |
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1887 _predicted_cards_scanned = 0; |
342 | 1888 #endif // PREDICTIONS_VERBOSE |
1889 } | |
1890 | |
1891 void | |
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1892 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1893 #if PREDICTIONS_VERBOSE |
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1894 if (!young) { |
342 | 1895 _recorded_marked_bytes += hr->max_live_bytes(); |
1896 } | |
1897 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1898 #endif // PREDICTIONS_VERBOSE | |
1899 | |
1900 size_t rs_length = hr->rem_set()->occupied(); | |
1901 _recorded_rs_lengths += rs_length; | |
1902 } | |
1903 | |
1904 void | |
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1905 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1906 assert(!hr->is_young(), "should not call this"); |
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1907 ++_recorded_non_young_regions; |
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1908 record_cset_region_info(hr, false); |
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1909 } |
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1910 |
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1911 void |
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1912 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1913 _recorded_young_regions = n_regions; |
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1914 } |
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1915 |
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1916 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1917 #if PREDICTIONS_VERBOSE |
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1918 _recorded_young_bytes = bytes; |
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1919 #endif // PREDICTIONS_VERBOSE |
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1920 } |
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1921 |
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1922 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1923 _recorded_rs_lengths = rs_lengths; |
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1924 } |
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1925 |
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1926 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1927 _predicted_bytes_to_copy = bytes; |
342 | 1928 } |
1929 | |
1930 void | |
1931 G1CollectorPolicy::end_recording_regions() { | |
1394
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1932 // The _predicted_pause_time_ms field is referenced in code |
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1933 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1934 _predicted_pause_time_ms = -1.0; |
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1935 |
342 | 1936 #if PREDICTIONS_VERBOSE |
1937 _predicted_pending_cards = predict_pending_cards(); | |
1938 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1939 if (full_young_gcs()) | |
1940 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1941 else | |
1942 _predicted_cards_scanned += | |
1943 predict_non_young_card_num(_predicted_rs_lengths); | |
1944 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1945 | |
1946 _predicted_rs_update_time_ms = | |
1947 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1948 _predicted_rs_scan_time_ms = | |
1949 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1950 _predicted_object_copy_time_ms = | |
1951 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1952 _predicted_constant_other_time_ms = | |
1953 predict_constant_other_time_ms(); | |
1954 _predicted_young_other_time_ms = | |
1955 predict_young_other_time_ms(_recorded_young_regions); | |
1956 _predicted_non_young_other_time_ms = | |
1957 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1958 | |
1959 _predicted_pause_time_ms = | |
1960 _predicted_rs_update_time_ms + | |
1961 _predicted_rs_scan_time_ms + | |
1962 _predicted_object_copy_time_ms + | |
1963 _predicted_constant_other_time_ms + | |
1964 _predicted_young_other_time_ms + | |
1965 _predicted_non_young_other_time_ms; | |
1966 #endif // PREDICTIONS_VERBOSE | |
1967 } | |
1968 | |
1969 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1970 predicted_time_ms) { | |
1971 // I don't think we need to do this when in young GC mode since | |
1972 // marking will be initiated next time we hit the soft limit anyway... | |
1973 if (predicted_time_ms > _expensive_region_limit_ms) { | |
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1974 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1975 "request partially-young GCs end", |
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1976 ergo_format_reason("predicted region time higher than threshold") |
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1977 ergo_format_ms("predicted region time") |
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1978 ergo_format_ms("threshold"), |
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1979 predicted_time_ms, _expensive_region_limit_ms); |
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1980 // no point in doing another partial one |
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1981 _should_revert_to_full_young_gcs = true; |
342 | 1982 } |
1983 } | |
1984 | |
1985 // </NEW PREDICTION> | |
1986 | |
1987 | |
1988 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1989 double elapsed_ms) { | |
1990 _recent_gc_times_ms->add(elapsed_ms); | |
1991 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1992 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1993 } | |
1994 | |
1995 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
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1996 if (_recent_pause_times_ms->num() == 0) { |
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1997 return (double) MaxGCPauseMillis; |
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1998 } |
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1999 return _recent_pause_times_ms->avg(); |
342 | 2000 } |
2001 | |
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2002 double G1CollectorPolicy::recent_avg_time_for_rs_scan_ms() { |
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2003 if (_recent_rs_scan_times_ms->num() == 0) { |
751 | 2004 return (double)MaxGCPauseMillis/3.0; |
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2005 } |
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2006 return _recent_rs_scan_times_ms->avg(); |
342 | 2007 } |
2008 | |
2009 int G1CollectorPolicy::number_of_recent_gcs() { | |
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2010 assert(_recent_rs_scan_times_ms->num() == |
342 | 2011 _recent_pause_times_ms->num(), "Sequence out of sync"); |
2012 assert(_recent_pause_times_ms->num() == | |
2013 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
2014 assert(_recent_CS_bytes_used_before->num() == | |
2015 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
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2016 |
342 | 2017 return _recent_pause_times_ms->num(); |
2018 } | |
2019 | |
2020 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
2021 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
2022 _recent_CS_bytes_used_before); | |
2023 } | |
2024 | |
2025 double G1CollectorPolicy::last_survival_fraction() { | |
2026 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
2027 _recent_CS_bytes_used_before); | |
2028 } | |
2029 | |
2030 double | |
2031 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
2032 TruncatedSeq* before) { | |
2033 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2034 if (before->sum() > 0.0) { | |
2035 double recent_survival_rate = surviving->sum() / before->sum(); | |
2036 // We exempt parallel collection from this check because Alloc Buffer | |
2037 // fragmentation can produce negative collections. | |
2038 // Further, we're now always doing parallel collection. But I'm still | |
2039 // leaving this here as a placeholder for a more precise assertion later. | |
2040 // (DLD, 10/05.) | |
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2041 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2042 _g1->evacuation_failed() || |
2043 recent_survival_rate <= 1.0, "Or bad frac"); | |
2044 return recent_survival_rate; | |
2045 } else { | |
2046 return 1.0; // Be conservative. | |
2047 } | |
2048 } | |
2049 | |
2050 double | |
2051 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2052 TruncatedSeq* before) { | |
2053 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2054 if (surviving->num() > 0 && before->last() > 0.0) { | |
2055 double last_survival_rate = surviving->last() / before->last(); | |
2056 // We exempt parallel collection from this check because Alloc Buffer | |
2057 // fragmentation can produce negative collections. | |
2058 // Further, we're now always doing parallel collection. But I'm still | |
2059 // leaving this here as a placeholder for a more precise assertion later. | |
2060 // (DLD, 10/05.) | |
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2061 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2062 last_survival_rate <= 1.0, "Or bad frac"); |
2063 return last_survival_rate; | |
2064 } else { | |
2065 return 1.0; | |
2066 } | |
2067 } | |
2068 | |
2069 static const int survival_min_obs = 5; | |
2070 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2071 static const double min_survival_rate = 0.1; | |
2072 | |
2073 double | |
2074 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2075 double latest) { | |
2076 double res = avg; | |
2077 if (number_of_recent_gcs() < survival_min_obs) { | |
2078 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2079 } | |
2080 res = MAX2(res, latest); | |
2081 res = MAX2(res, min_survival_rate); | |
2082 // In the parallel case, LAB fragmentation can produce "negative | |
2083 // collections"; so can evac failure. Cap at 1.0 | |
2084 res = MIN2(res, 1.0); | |
2085 return res; | |
2086 } | |
2087 | |
2088 size_t G1CollectorPolicy::expansion_amount() { | |
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2089 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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2090 double threshold = _gc_overhead_perc; |
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2091 if (recent_gc_overhead > threshold) { |
751 | 2092 // We will double the existing space, or take |
2093 // G1ExpandByPercentOfAvailable % of the available expansion | |
2094 // space, whichever is smaller, bounded below by a minimum | |
2095 // expansion (unless that's all that's left.) | |
342 | 2096 const size_t min_expand_bytes = 1*M; |
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2097 size_t reserved_bytes = _g1->max_capacity(); |
342 | 2098 size_t committed_bytes = _g1->capacity(); |
2099 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2100 size_t expand_bytes; | |
2101 size_t expand_bytes_via_pct = | |
751 | 2102 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2103 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2104 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2105 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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2106 |
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2107 ergo_verbose5(ErgoHeapSizing, |
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2108 "attempt heap expansion", |
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2109 ergo_format_reason("recent GC overhead higher than " |
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2110 "threshold after GC") |
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2111 ergo_format_perc("recent GC overhead") |
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2112 ergo_format_perc("threshold") |
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2113 ergo_format_byte("uncommitted") |
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2114 ergo_format_byte_perc("calculated expansion amount"), |
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2115 recent_gc_overhead, threshold, |
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2116 uncommitted_bytes, |
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2117 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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2118 |
342 | 2119 return expand_bytes; |
2120 } else { | |
2121 return 0; | |
2122 } | |
2123 } | |
2124 | |
2125 class CountCSClosure: public HeapRegionClosure { | |
2126 G1CollectorPolicy* _g1_policy; | |
2127 public: | |
2128 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2129 _g1_policy(g1_policy) {} | |
2130 bool doHeapRegion(HeapRegion* r) { | |
2131 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2132 return false; | |
2133 } | |
2134 }; | |
2135 | |
2136 void G1CollectorPolicy::count_CS_bytes_used() { | |
2137 CountCSClosure cs_closure(this); | |
2138 _g1->collection_set_iterate(&cs_closure); | |
2139 } | |
2140 | |
2141 void G1CollectorPolicy::print_summary (int level, | |
2142 const char* str, | |
2143 NumberSeq* seq) const { | |
2144 double sum = seq->sum(); | |
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2145 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 2146 str, sum / 1000.0, seq->avg()); |
2147 } | |
2148 | |
2149 void G1CollectorPolicy::print_summary_sd (int level, | |
2150 const char* str, | |
2151 NumberSeq* seq) const { | |
2152 print_summary(level, str, seq); | |
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2153 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 2154 seq->num(), seq->sd(), seq->maximum()); |
2155 } | |
2156 | |
2157 void G1CollectorPolicy::check_other_times(int level, | |
2158 NumberSeq* other_times_ms, | |
2159 NumberSeq* calc_other_times_ms) const { | |
2160 bool should_print = false; | |
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2161 LineBuffer buf(level + 2); |
342 | 2162 |
2163 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2164 fabs(calc_other_times_ms->sum())); | |
2165 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2166 fabs(calc_other_times_ms->sum())); | |
2167 double sum_ratio = max_sum / min_sum; | |
2168 if (sum_ratio > 1.1) { | |
2169 should_print = true; | |
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2170 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 2171 } |
2172 | |
2173 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2174 fabs(calc_other_times_ms->avg())); | |
2175 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2176 fabs(calc_other_times_ms->avg())); | |
2177 double avg_ratio = max_avg / min_avg; | |
2178 if (avg_ratio > 1.1) { | |
2179 should_print = true; | |
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2180 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 2181 } |
2182 | |
2183 if (other_times_ms->sum() < -0.01) { | |
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2184 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 2185 } |
2186 | |
2187 if (other_times_ms->avg() < -0.01) { | |
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2188 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 2189 } |
2190 | |
2191 if (calc_other_times_ms->sum() < -0.01) { | |
2192 should_print = true; | |
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2193 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 2194 } |
2195 | |
2196 if (calc_other_times_ms->avg() < -0.01) { | |
2197 should_print = true; | |
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2198 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 2199 } |
2200 | |
2201 if (should_print) | |
2202 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2203 } | |
2204 | |
2205 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2206 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2207 MainBodySummary* body_summary = summary->main_body_summary(); |
2208 if (summary->get_total_seq()->num() > 0) { | |
677 | 2209 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2210 if (body_summary != NULL) { |
2211 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2212 if (parallel) { | |
2213 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2214 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2215 print_summary(2, "Ext Root Scanning", | |
2216 body_summary->get_ext_root_scan_seq()); | |
2217 print_summary(2, "Mark Stack Scanning", | |
2218 body_summary->get_mark_stack_scan_seq()); | |
2219 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2220 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2221 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2222 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2223 { | |
2224 NumberSeq* other_parts[] = { | |
2225 body_summary->get_update_rs_seq(), | |
2226 body_summary->get_ext_root_scan_seq(), | |
2227 body_summary->get_mark_stack_scan_seq(), | |
2228 body_summary->get_scan_rs_seq(), | |
2229 body_summary->get_obj_copy_seq(), | |
2230 body_summary->get_termination_seq() | |
2231 }; | |
2232 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2233 6, other_parts); |
342 | 2234 check_other_times(2, body_summary->get_parallel_other_seq(), |
2235 &calc_other_times_ms); | |
2236 } | |
2237 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2238 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2239 } else { | |
2240 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2241 print_summary(1, "Ext Root Scanning", | |
2242 body_summary->get_ext_root_scan_seq()); | |
2243 print_summary(1, "Mark Stack Scanning", | |
2244 body_summary->get_mark_stack_scan_seq()); | |
2245 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2246 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2247 } | |
2248 } | |
2249 print_summary(1, "Other", summary->get_other_seq()); | |
2250 { | |
1779 | 2251 if (body_summary != NULL) { |
2252 NumberSeq calc_other_times_ms; | |
2253 if (parallel) { | |
2254 // parallel | |
2255 NumberSeq* other_parts[] = { | |
2256 body_summary->get_satb_drain_seq(), | |
2257 body_summary->get_parallel_seq(), | |
2258 body_summary->get_clear_ct_seq() | |
2259 }; | |
2260 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2261 3, other_parts); | |
2262 } else { | |
2263 // serial | |
2264 NumberSeq* other_parts[] = { | |
2265 body_summary->get_satb_drain_seq(), | |
2266 body_summary->get_update_rs_seq(), | |
2267 body_summary->get_ext_root_scan_seq(), | |
2268 body_summary->get_mark_stack_scan_seq(), | |
2269 body_summary->get_scan_rs_seq(), | |
2270 body_summary->get_obj_copy_seq() | |
2271 }; | |
2272 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2273 6, other_parts); | |
2274 } | |
2275 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2276 } |
2277 } | |
2278 } else { | |
2363
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2279 LineBuffer(1).append_and_print_cr("none"); |
342 | 2280 } |
2363
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|
2281 LineBuffer(0).append_and_print_cr(""); |
342 | 2282 } |
2283 | |
2284 void G1CollectorPolicy::print_tracing_info() const { | |
2285 if (TraceGen0Time) { | |
2286 gclog_or_tty->print_cr("ALL PAUSES"); | |
2287 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2288 gclog_or_tty->print_cr(""); | |
2289 gclog_or_tty->print_cr(""); | |
2290 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2291 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2292 gclog_or_tty->print_cr(""); | |
2293 | |
677 | 2294 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2295 print_summary(_summary); | |
342 | 2296 |
2297 gclog_or_tty->print_cr("MISC"); | |
2298 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2299 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2300 for (int i = 0; i < _aux_num; ++i) { | |
2301 if (_all_aux_times_ms[i].num() > 0) { | |
2302 char buffer[96]; | |
2303 sprintf(buffer, "Aux%d", i); | |
2304 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2305 } | |
2306 } | |
2307 | |
2308 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2309 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2310 "Tenured %8d (%6.2lf%%)", | |
2311 all_region_num, | |
2312 _region_num_young, | |
2313 (double) _region_num_young / (double) all_region_num * 100.0, | |
2314 _region_num_tenured, | |
2315 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2316 } | |
2317 if (TraceGen1Time) { | |
2318 if (_all_full_gc_times_ms->num() > 0) { | |
2319 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2320 _all_full_gc_times_ms->num(), | |
2321 _all_full_gc_times_ms->sum() / 1000.0); | |
2322 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2323 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2324 _all_full_gc_times_ms->sd(), | |
2325 _all_full_gc_times_ms->maximum()); | |
2326 } | |
2327 } | |
2328 } | |
2329 | |
2330 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2331 #ifndef PRODUCT | |
2332 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2333 // add this call for any other surv rate groups | |
2334 #endif // PRODUCT | |
2335 } | |
2336 | |
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2337 void G1CollectorPolicy::update_region_num(bool young) { |
1973 | 2338 if (young) { |
342 | 2339 ++_region_num_young; |
2340 } else { | |
2341 ++_region_num_tenured; | |
2342 } | |
2343 } | |
2344 | |
2345 #ifndef PRODUCT | |
2346 // for debugging, bit of a hack... | |
2347 static char* | |
2348 region_num_to_mbs(int length) { | |
2349 static char buffer[64]; | |
2350 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2351 double mbs = bytes / (double) (1024 * 1024); | |
2352 sprintf(buffer, "%7.2lfMB", mbs); | |
2353 return buffer; | |
2354 } | |
2355 #endif // PRODUCT | |
2356 | |
545 | 2357 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2358 switch (purpose) { |
2359 case GCAllocForSurvived: | |
545 | 2360 return _max_survivor_regions; |
342 | 2361 case GCAllocForTenured: |
545 | 2362 return REGIONS_UNLIMITED; |
342 | 2363 default: |
545 | 2364 ShouldNotReachHere(); |
2365 return REGIONS_UNLIMITED; | |
342 | 2366 }; |
2367 } | |
2368 | |
3919
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2369 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
1991
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2370 size_t expansion_region_num = 0; |
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2371 if (GCLockerEdenExpansionPercent > 0) { |
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2372 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2373 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2374 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2375 // less than 1.0) we'll get 1. |
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diff
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|
2376 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
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|
2377 } else { |
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6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
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|
2378 assert(expansion_region_num == 0, "sanity"); |
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diff
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|
2379 } |
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|
2380 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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|
2381 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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|
2382 } |
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|
2383 |
545 | 2384 // Calculates survivor space parameters. |
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2385 void G1CollectorPolicy::update_survivors_policy() { |
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7084509: G1: fix inconsistencies and mistakes in the young list target length calculations
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2386 double max_survivor_regions_d = |
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|
2387 (double) _young_list_target_length / (double) SurvivorRatio; |
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2388 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2389 // smaller than 1.0) we'll get 1. |
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2390 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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|
2391 |
3868
ae73da50be4b
7081064: G1: remove develop params G1FixedSurvivorSpaceSize, G1FixedTenuringThreshold, and G1FixedEdenSize
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3867
diff
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|
2392 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2393 HeapRegion::GrainWords * _max_survivor_regions); |
2394 } | |
2395 | |
342 | 2396 #ifndef PRODUCT |
2397 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2398 CollectionSetChooser* _chooser; | |
2399 public: | |
2400 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2401 _chooser(chooser) {} | |
2402 | |
2403 bool doHeapRegion(HeapRegion* r) { | |
2404 if (!r->continuesHumongous()) { | |
2405 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2406 } | |
2407 return false; | |
2408 } | |
2409 }; | |
2410 | |
4013 | 2411 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2412 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2413 _g1->heap_region_iterate(&cl); | |
2414 return true; | |
2415 } | |
2416 #endif | |
2417 | |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2418 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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|
2419 GCCause::Cause gc_cause) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2420 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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6944166: G1: explicit GCs are not always handled correctly
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|
2421 if (!during_cycle) { |
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|
2422 ergo_verbose1(ErgoConcCycles, |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2423 "request concurrent cycle initiation", |
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|
2424 ergo_format_reason("requested by GC cause") |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2425 ergo_format_str("GC cause"), |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2426 GCCause::to_string(gc_cause)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2427 set_initiate_conc_mark_if_possible(); |
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6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2428 return true; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2429 } else { |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
2430 ergo_verbose1(ErgoConcCycles, |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2431 "do not request concurrent cycle initiation", |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
2432 ergo_format_reason("concurrent cycle already in progress") |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2433 ergo_format_str("GC cause"), |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2434 GCCause::to_string(gc_cause)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
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|
2435 return false; |
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1611
diff
changeset
|
2436 } |
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diff
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|
2437 } |
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|
2438 |
342 | 2439 void |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2440 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2441 // We are about to decide on whether this pause will be an |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
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|
2442 // initial-mark pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2443 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2444 // First, during_initial_mark_pause() should not be already set. We |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2445 // will set it here if we have to. However, it should be cleared by |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2446 // the end of the pause (it's only set for the duration of an |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2447 // initial-mark pause). |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2448 assert(!during_initial_mark_pause(), "pre-condition"); |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2449 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2450 if (initiate_conc_mark_if_possible()) { |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2451 // We had noticed on a previous pause that the heap occupancy has |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2452 // gone over the initiating threshold and we should start a |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2453 // concurrent marking cycle. So we might initiate one. |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2454 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2455 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2456 if (!during_cycle) { |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2457 // The concurrent marking thread is not "during a cycle", i.e., |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
2458 // it has completed the last one. So we can go ahead and |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
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|
2459 // initiate a new cycle. |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2460 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2461 set_during_initial_mark_pause(); |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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3979
diff
changeset
|
2462 // We do not allow non-full young GCs during marking. |
273b46400613
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3979
diff
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|
2463 if (!full_young_gcs()) { |
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2464 set_full_young_gcs(true); |
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2465 ergo_verbose0(ErgoPartiallyYoungGCs, |
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2466 "end partially-young GCs", |
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2467 ergo_format_reason("concurrent cycle is about to start")); |
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2468 } |
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2469 |
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2470 // And we can now clear initiate_conc_mark_if_possible() as |
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2471 // we've already acted on it. |
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2472 clear_initiate_conc_mark_if_possible(); |
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2473 |
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2474 ergo_verbose0(ErgoConcCycles, |
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2475 "initiate concurrent cycle", |
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2476 ergo_format_reason("concurrent cycle initiation requested")); |
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2477 } else { |
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2478 // The concurrent marking thread is still finishing up the |
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2479 // previous cycle. If we start one right now the two cycles |
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2480 // overlap. In particular, the concurrent marking thread might |
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2481 // be in the process of clearing the next marking bitmap (which |
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2482 // we will use for the next cycle if we start one). Starting a |
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2483 // cycle now will be bad given that parts of the marking |
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2484 // information might get cleared by the marking thread. And we |
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2485 // cannot wait for the marking thread to finish the cycle as it |
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2486 // periodically yields while clearing the next marking bitmap |
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2487 // and, if it's in a yield point, it's waiting for us to |
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2488 // finish. So, at this point we will not start a cycle and we'll |
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2489 // let the concurrent marking thread complete the last one. |
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2490 ergo_verbose0(ErgoConcCycles, |
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2491 "do not initiate concurrent cycle", |
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2492 ergo_format_reason("concurrent cycle already in progress")); |
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2493 } |
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2494 } |
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2495 } |
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2496 |
342 | 2497 class KnownGarbageClosure: public HeapRegionClosure { |
2498 CollectionSetChooser* _hrSorted; | |
2499 | |
2500 public: | |
2501 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2502 _hrSorted(hrSorted) | |
2503 {} | |
2504 | |
2505 bool doHeapRegion(HeapRegion* r) { | |
2506 // We only include humongous regions in collection | |
2507 // sets when concurrent mark shows that their contained object is | |
2508 // unreachable. | |
2509 | |
2510 // Do we have any marking information for this region? | |
2511 if (r->is_marked()) { | |
2512 // We don't include humongous regions in collection | |
2513 // sets because we collect them immediately at the end of a marking | |
2514 // cycle. We also don't include young regions because we *must* | |
2515 // include them in the next collection pause. | |
2516 if (!r->isHumongous() && !r->is_young()) { | |
2517 _hrSorted->addMarkedHeapRegion(r); | |
2518 } | |
2519 } | |
2520 return false; | |
2521 } | |
2522 }; | |
2523 | |
2524 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2525 CollectionSetChooser* _hrSorted; | |
2526 jint _marked_regions_added; | |
2527 jint _chunk_size; | |
2528 jint _cur_chunk_idx; | |
2529 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2530 int _worker; | |
2531 int _invokes; | |
2532 | |
2533 void get_new_chunk() { | |
2534 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2535 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2536 } | |
2537 void add_region(HeapRegion* r) { | |
2538 if (_cur_chunk_idx == _cur_chunk_end) { | |
2539 get_new_chunk(); | |
2540 } | |
2541 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2542 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2543 _marked_regions_added++; | |
2544 _cur_chunk_idx++; | |
2545 } | |
2546 | |
2547 public: | |
2548 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2549 jint chunk_size, | |
2550 int worker) : | |
2551 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2552 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2553 _invokes(0) | |
2554 {} | |
2555 | |
2556 bool doHeapRegion(HeapRegion* r) { | |
2557 // We only include humongous regions in collection | |
2558 // sets when concurrent mark shows that their contained object is | |
2559 // unreachable. | |
2560 _invokes++; | |
2561 | |
2562 // Do we have any marking information for this region? | |
2563 if (r->is_marked()) { | |
2564 // We don't include humongous regions in collection | |
2565 // sets because we collect them immediately at the end of a marking | |
2566 // cycle. | |
2567 // We also do not include young regions in collection sets | |
2568 if (!r->isHumongous() && !r->is_young()) { | |
2569 add_region(r); | |
2570 } | |
2571 } | |
2572 return false; | |
2573 } | |
2574 jint marked_regions_added() { return _marked_regions_added; } | |
2575 int invokes() { return _invokes; } | |
2576 }; | |
2577 | |
2578 class ParKnownGarbageTask: public AbstractGangTask { | |
2579 CollectionSetChooser* _hrSorted; | |
2580 jint _chunk_size; | |
2581 G1CollectedHeap* _g1; | |
2582 public: | |
2583 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2584 AbstractGangTask("ParKnownGarbageTask"), | |
2585 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2586 _g1(G1CollectedHeap::heap()) | |
2587 {} | |
2588 | |
2589 void work(int i) { | |
2590 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2591 // Back to zero for the claim value. | |
355 | 2592 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2593 HeapRegion::InitialClaimValue); | |
342 | 2594 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2595 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2596 if (G1PrintParCleanupStats) { | |
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2597 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2598 i, parKnownGarbageCl.invokes(), regions_added); |
2599 } | |
2600 } | |
2601 }; | |
2602 | |
2603 void | |
4013 | 2604 G1CollectorPolicy::record_concurrent_mark_cleanup_end() { |
2605 double start_sec; | |
2606 if (G1PrintParCleanupStats) { | |
2607 start_sec = os::elapsedTime(); | |
2608 } | |
342 | 2609 |
2610 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2611 double clear_marked_end_sec; |
342 | 2612 if (G1PrintParCleanupStats) { |
4013 | 2613 clear_marked_end_sec = os::elapsedTime(); |
2614 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2615 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2616 } |
4013 | 2617 |
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2618 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2619 const size_t OverpartitionFactor = 4; |
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2620 const size_t MinWorkUnit = 8; |
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2621 const size_t WorkUnit = |
342 | 2622 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2623 MinWorkUnit); |
342 | 2624 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2625 WorkUnit); |
342 | 2626 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2627 (int) WorkUnit); |
342 | 2628 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2629 |
2630 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2631 "sanity check"); | |
342 | 2632 } else { |
2633 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2634 _g1->heap_region_iterate(&knownGarbagecl); | |
2635 } | |
4013 | 2636 double known_garbage_end_sec; |
342 | 2637 if (G1PrintParCleanupStats) { |
4013 | 2638 known_garbage_end_sec = os::elapsedTime(); |
342 | 2639 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2640 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2641 } |
4013 | 2642 |
342 | 2643 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2644 double end_sec = os::elapsedTime(); |
342 | 2645 if (G1PrintParCleanupStats) { |
2646 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2647 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2648 } |
2649 | |
4013 | 2650 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2651 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2652 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2653 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2654 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2655 } |
2656 | |
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2657 // Add the heap region at the head of the non-incremental collection set |
342 | 2658 void G1CollectorPolicy:: |
2659 add_to_collection_set(HeapRegion* hr) { | |
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2660 assert(_inc_cset_build_state == Active, "Precondition"); |
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2661 assert(!hr->is_young(), "non-incremental add of young region"); |
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2662 |
342 | 2663 if (_g1->mark_in_progress()) |
2664 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2665 | |
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2666 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2667 hr->set_in_collection_set(true); |
2668 hr->set_next_in_collection_set(_collection_set); | |
2669 _collection_set = hr; | |
2670 _collection_set_size++; | |
2671 _collection_set_bytes_used_before += hr->used(); | |
526 | 2672 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2673 } |
2674 | |
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2675 // Initialize the per-collection-set information |
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2676 void G1CollectorPolicy::start_incremental_cset_building() { |
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2677 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2678 |
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2679 _inc_cset_head = NULL; |
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2680 _inc_cset_tail = NULL; |
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2681 _inc_cset_size = 0; |
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2682 _inc_cset_bytes_used_before = 0; |
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2683 |
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2684 _inc_cset_young_index = 0; |
1394
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2685 |
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2686 _inc_cset_max_finger = 0; |
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2687 _inc_cset_recorded_young_bytes = 0; |
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2688 _inc_cset_recorded_rs_lengths = 0; |
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2689 _inc_cset_predicted_elapsed_time_ms = 0; |
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2690 _inc_cset_predicted_bytes_to_copy = 0; |
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2691 _inc_cset_build_state = Active; |
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2692 } |
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2693 |
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2694 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2695 // This routine is used when: |
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2696 // * adding survivor regions to the incremental cset at the end of an |
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2697 // evacuation pause, |
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2698 // * adding the current allocation region to the incremental cset |
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2699 // when it is retired, and |
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2700 // * updating existing policy information for a region in the |
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2701 // incremental cset via young list RSet sampling. |
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2702 // Therefore this routine may be called at a safepoint by the |
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2703 // VM thread, or in-between safepoints by mutator threads (when |
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2704 // retiring the current allocation region) or a concurrent |
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|
2705 // refine thread (RSet sampling). |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2706 |
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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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|
2707 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
2708 size_t used_bytes = hr->used(); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2709 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2710 _inc_cset_recorded_rs_lengths += rs_length; |
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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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|
2711 _inc_cset_predicted_elapsed_time_ms += region_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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|
2712 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2713 _inc_cset_bytes_used_before += used_bytes; |
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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
|
2714 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2715 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2716 // in the heap region in case we have to remove this region from |
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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
|
2717 // the incremental collection set, or it is updated by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2718 // rset sampling code |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2719 hr->set_recorded_rs_length(rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2720 hr->set_predicted_elapsed_time_ms(region_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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|
2721 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2722 #if PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2723 size_t bytes_to_copy = predict_bytes_to_copy(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
|
2724 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2725 |
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changeset
|
2726 // Record the number of bytes used in this region |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2727 _inc_cset_recorded_young_bytes += used_bytes; |
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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
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|
2728 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2729 // Cache the values we have added to the aggregated informtion |
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|
2730 // in the heap region in case we have to remove this region from |
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|
2731 // the incremental collection set, or it is updated by the |
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|
2732 // rset sampling code |
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|
2733 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
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changeset
|
2734 #endif // PREDICTIONS_VERBOSE |
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|
2735 } |
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diff
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|
2736 |
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changeset
|
2737 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2738 // This routine is currently only called as part of the updating of |
1316cec51b4d
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|
2739 // existing policy information for regions in the incremental cset that |
1316cec51b4d
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changeset
|
2740 // is performed by the concurrent refine thread(s) as part of young list |
1316cec51b4d
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parents:
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|
2741 // RSet sampling. Therefore we should not be at a safepoint. |
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|
2742 |
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changeset
|
2743 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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parents:
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|
2744 assert(hr->is_young(), "it should be"); |
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diff
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|
2745 |
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changeset
|
2746 size_t used_bytes = hr->used(); |
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|
2747 size_t old_rs_length = hr->recorded_rs_length(); |
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|
2748 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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parents:
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diff
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|
2749 |
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parents:
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diff
changeset
|
2750 // Subtract the old recorded/predicted policy information for |
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
|
2751 // the given heap region from the collection set info. |
1316cec51b4d
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parents:
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changeset
|
2752 _inc_cset_recorded_rs_lengths -= old_rs_length; |
1316cec51b4d
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parents:
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changeset
|
2753 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
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
|
2754 |
1316cec51b4d
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diff
changeset
|
2755 _inc_cset_bytes_used_before -= used_bytes; |
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parents:
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diff
changeset
|
2756 |
1316cec51b4d
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parents:
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diff
changeset
|
2757 // Clear the values cached in the heap region |
1316cec51b4d
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parents:
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diff
changeset
|
2758 hr->set_recorded_rs_length(0); |
1316cec51b4d
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|
2759 hr->set_predicted_elapsed_time_ms(0); |
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parents:
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diff
changeset
|
2760 |
1316cec51b4d
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parents:
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diff
changeset
|
2761 #if PREDICTIONS_VERBOSE |
1316cec51b4d
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parents:
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changeset
|
2762 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
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parents:
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changeset
|
2763 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
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parents:
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diff
changeset
|
2764 |
1316cec51b4d
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parents:
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diff
changeset
|
2765 // Subtract the number of bytes used in this region |
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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
|
2766 _inc_cset_recorded_young_bytes -= used_bytes; |
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parents:
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diff
changeset
|
2767 |
1316cec51b4d
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parents:
1391
diff
changeset
|
2768 // Clear the values cached in the heap region |
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
|
2769 hr->set_predicted_bytes_to_copy(0); |
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
|
2770 #endif // PREDICTIONS_VERBOSE |
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
|
2771 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2772 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2773 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2774 // Update the collection set information that is dependent on the new RS length |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2775 assert(hr->is_young(), "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2776 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2777 remove_from_incremental_cset_info(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
|
2778 add_to_incremental_cset_info(hr, new_rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2779 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2780 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2781 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2782 assert( hr->is_young(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2783 assert( hr->young_index_in_cset() == -1, "invariant" ); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2784 assert(_inc_cset_build_state == Active, "Precondition"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2785 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2786 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2787 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2788 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2789 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2790 // and cached in the heap region here (initially) and (subsequently) |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2791 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2792 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2793 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2794 add_to_incremental_cset_info(hr, rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2796 HeapWord* hr_end = hr->end(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2797 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2798 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2799 assert(!hr->in_collection_set(), "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2800 hr->set_in_collection_set(true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2801 assert( hr->next_in_collection_set() == 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
|
2802 |
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
|
2803 _inc_cset_size++; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2804 _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:
1391
diff
changeset
|
2805 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2806 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2807 ++_inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2808 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2809 |
1316cec51b4d
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parents:
1391
diff
changeset
|
2810 // 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:
1391
diff
changeset
|
2811 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:
1391
diff
changeset
|
2812 // 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:
1391
diff
changeset
|
2813 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
|
2814 |
1316cec51b4d
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parents:
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diff
changeset
|
2815 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2816 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
|
2817 |
1316cec51b4d
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parents:
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diff
changeset
|
2818 // Now add the region at the right hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2819 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:
1391
diff
changeset
|
2820 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:
1391
diff
changeset
|
2821 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2822 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2823 _inc_cset_tail->set_next_in_collection_set(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2824 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2825 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2826 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2827 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2828 // Add the region to the LHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2829 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2830 // Survivors should be added to the RHS at the end of a pause |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2831 assert(!hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2832 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2833 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2834 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2835 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2836 // Add the region at the left hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2837 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2838 if (_inc_cset_head == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2839 assert(_inc_cset_tail == NULL, "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2840 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2841 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2842 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2843 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2844 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2845 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2846 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
|
2847 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
|
2848 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2849 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
|
2850 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2851 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2852 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
|
2853 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
|
2854 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
|
2855 "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
|
2856 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2857 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2858 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
|
2859 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
|
2860 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
|
2861 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
|
2862 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2863 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2864 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2865 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2866 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2867 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2868 |
4013 | 2869 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
|
2870 // 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
|
2871 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
|
2872 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2873 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
|
2874 |
342 | 2875 start_recording_regions(); |
2876 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2877 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2878 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
|
2879 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2880 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2881 |
2882 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2883 double predicted_pause_time_ms = base_time_ms; | |
2884 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2885 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2886 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2887 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2888 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2889 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
|
2890 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2891 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
|
2892 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
|
2893 |
342 | 2894 // 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
|
2895 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
|
2896 if (time_remaining_ms < threshold) { |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2897 double prev_time_remaining_ms = time_remaining_ms; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2898 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2899 _within_target = false; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2900 ergo_verbose3(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2901 "adjust remaining time", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2902 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
|
2903 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2904 ergo_format_ms("threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2905 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
|
2906 prev_time_remaining_ms, threshold, time_remaining_ms); |
342 | 2907 } else { |
2908 _within_target = true; | |
2909 } | |
2910 | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2911 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
|
2912 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2913 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2914 double young_start_time_sec = os::elapsedTime(); |
342 | 2915 |
677 | 2916 _collection_set_bytes_used_before = 0; |
2917 _collection_set_size = 0; | |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2918 _young_cset_length = 0; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2919 _last_young_gc_full = full_young_gcs() ? true : false; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2920 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2921 if (_last_young_gc_full) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2922 ++_full_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2923 } else { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2924 ++_partial_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2925 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2926 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2927 // 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
|
2928 // 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
|
2929 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2930 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2931 size_t survivor_region_num = young_list->survivor_length(); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2932 size_t eden_region_num = young_list->length() - survivor_region_num; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2933 size_t old_region_num = 0; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2934 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2935 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2936 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2937 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2938 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2939 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2940 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2941 // Clear the fields that point to the survivor list - they are all young now. |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2942 young_list->clear_survivors(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2943 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2944 if (_g1->mark_in_progress()) |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2945 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2946 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2947 _young_cset_length = _inc_cset_young_index; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2948 _collection_set = _inc_cset_head; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2949 _collection_set_size = _inc_cset_size; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2950 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2951 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2952 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2953 |
3914
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2954 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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2955 "add young regions to CSet", |
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2956 ergo_format_region("eden") |
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2957 ergo_format_region("survivors") |
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2958 ergo_format_ms("predicted young region time"), |
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2959 eden_region_num, survivor_region_num, |
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2960 _inc_cset_predicted_elapsed_time_ms); |
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2961 |
3867
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2962 // The number of recorded young regions is the incremental |
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2963 // collection set's current size |
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2964 set_recorded_young_regions(_inc_cset_size); |
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2965 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2966 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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2967 #if PREDICTIONS_VERBOSE |
3867
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2968 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
1394
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2969 #endif // PREDICTIONS_VERBOSE |
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|
2970 |
3914
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2971 assert(_inc_cset_size == young_list->length(), "Invariant"); |
3867
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2972 |
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2973 double young_end_time_sec = os::elapsedTime(); |
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2974 _recorded_young_cset_choice_time_ms = |
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2975 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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2976 |
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2977 // We are doing young collections so reset this. |
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2978 non_young_start_time_sec = young_end_time_sec; |
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2979 |
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2980 if (!full_young_gcs()) { |
342 | 2981 bool should_continue = true; |
2982 NumberSeq seq; | |
2983 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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2984 |
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2985 size_t prev_collection_set_size = _collection_set_size; |
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2986 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
342 | 2987 do { |
2988 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2989 avg_prediction); | |
677 | 2990 if (hr != NULL) { |
342 | 2991 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2992 time_remaining_ms -= predicted_time_ms; | |
2993 predicted_pause_time_ms += predicted_time_ms; | |
2994 add_to_collection_set(hr); | |
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2995 record_non_young_cset_region(hr); |
342 | 2996 seq.add(predicted_time_ms); |
2997 avg_prediction = seq.avg() + seq.sd(); | |
2998 } | |
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|
2999 |
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|
3000 should_continue = true; |
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3001 if (hr == NULL) { |
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3002 // No need for an ergo verbose message here, |
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3003 // getNextMarkRegion() does this when it returns NULL. |
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3004 should_continue = false; |
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3005 } else { |
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|
3006 if (adaptive_young_list_length()) { |
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|
3007 if (time_remaining_ms < 0.0) { |
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|
3008 ergo_verbose1(ErgoCSetConstruction, |
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|
3009 "stop adding old regions to CSet", |
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|
3010 ergo_format_reason("remaining time is lower than 0") |
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|
3011 ergo_format_ms("remaining time"), |
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|
3012 time_remaining_ms); |
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|
3013 should_continue = false; |
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|
3014 } |
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|
3015 } else { |
3927
f1b4e0e0bdad
7089625: G1: policy for how many old regions to add to the CSet (when young gen is fixed) is broken
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3920
diff
changeset
|
3016 if (_collection_set_size >= _young_list_fixed_length) { |
3914
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|
3017 ergo_verbose2(ErgoCSetConstruction, |
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|
3018 "stop adding old regions to CSet", |
3927
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3920
diff
changeset
|
3019 ergo_format_reason("CSet length reached target") |
3914
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|
3020 ergo_format_region("CSet") |
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|
3021 ergo_format_region("young target"), |
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|
3022 _collection_set_size, _young_list_fixed_length); |
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|
3023 should_continue = false; |
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|
3024 } |
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changeset
|
3025 } |
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|
3026 } |
342 | 3027 } while (should_continue); |
3028 | |
3029 if (!adaptive_young_list_length() && | |
3914
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|
3030 _collection_set_size < _young_list_fixed_length) { |
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|
3031 ergo_verbose2(ErgoCSetConstruction, |
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changeset
|
3032 "request partially-young GCs end", |
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|
3033 ergo_format_reason("CSet length lower than target") |
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|
3034 ergo_format_region("CSet") |
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changeset
|
3035 ergo_format_region("young target"), |
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changeset
|
3036 _collection_set_size, _young_list_fixed_length); |
342 | 3037 _should_revert_to_full_young_gcs = true; |
3914
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|
3038 } |
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diff
changeset
|
3039 |
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changeset
|
3040 old_region_num = _collection_set_size - prev_collection_set_size; |
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|
3041 |
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changeset
|
3042 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
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diff
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|
3043 "add old regions to CSet", |
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diff
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|
3044 ergo_format_region("old") |
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diff
changeset
|
3045 ergo_format_ms("predicted old region time"), |
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|
3046 old_region_num, |
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changeset
|
3047 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
342 | 3048 } |
3049 | |
1394
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|
3050 stop_incremental_cset_building(); |
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diff
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|
3051 |
342 | 3052 count_CS_bytes_used(); |
3053 | |
3054 end_recording_regions(); | |
3055 | |
3914
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|
3056 ergo_verbose5(ErgoCSetConstruction, |
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diff
changeset
|
3057 "finish choosing CSet", |
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|
3058 ergo_format_region("eden") |
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changeset
|
3059 ergo_format_region("survivors") |
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diff
changeset
|
3060 ergo_format_region("old") |
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diff
changeset
|
3061 ergo_format_ms("predicted pause time") |
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diff
changeset
|
3062 ergo_format_ms("target pause time"), |
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|
3063 eden_region_num, survivor_region_num, old_region_num, |
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|
3064 predicted_pause_time_ms, target_pause_time_ms); |
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|
3065 |
342 | 3066 double non_young_end_time_sec = os::elapsedTime(); |
3067 _recorded_non_young_cset_choice_time_ms = | |
3068 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3069 } |