Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3824:6aa4feb8a366
7069863: G1: SIGSEGV running SPECjbb2011 and -UseBiasedLocking
Summary: Align the reserved size of the heap and perm to the heap region size to get a preferred heap base that is aligned to the region size, and call the correct heap reservation constructor. Also add a check in the heap reservation code that the reserved space starts at the requested address (if any).
Reviewed-by: kvn, ysr
author | johnc |
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date | Tue, 02 Aug 2011 12:13:13 -0700 |
parents | 14a2fd14c0db |
children | f44782f04dd4 |
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" | |
31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
32 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
33 #include "runtime/arguments.hpp" | |
34 #include "runtime/java.hpp" | |
35 #include "runtime/mutexLocker.hpp" | |
36 #include "utilities/debug.hpp" | |
342 | 37 |
38 #define PREDICTIONS_VERBOSE 0 | |
39 | |
40 // <NEW PREDICTION> | |
41 | |
42 // Different defaults for different number of GC threads | |
43 // They were chosen by running GCOld and SPECjbb on debris with different | |
44 // numbers of GC threads and choosing them based on the results | |
45 | |
46 // all the same | |
47 static double rs_length_diff_defaults[] = { | |
48 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
49 }; | |
50 | |
51 static double cost_per_card_ms_defaults[] = { | |
52 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
53 }; | |
54 | |
55 // all the same | |
56 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
57 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
58 }; | |
59 | |
60 static double cost_per_entry_ms_defaults[] = { | |
61 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
62 }; | |
63 | |
64 static double cost_per_byte_ms_defaults[] = { | |
65 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
66 }; | |
67 | |
68 // these should be pretty consistent | |
69 static double constant_other_time_ms_defaults[] = { | |
70 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
71 }; | |
72 | |
73 | |
74 static double young_other_cost_per_region_ms_defaults[] = { | |
75 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
76 }; | |
77 | |
78 static double non_young_other_cost_per_region_ms_defaults[] = { | |
79 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
80 }; | |
81 | |
82 // </NEW PREDICTION> | |
83 | |
2363
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84 // Help class for avoiding interleaved logging |
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85 class LineBuffer: public StackObj { |
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86 |
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87 private: |
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88 static const int BUFFER_LEN = 1024; |
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89 static const int INDENT_CHARS = 3; |
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90 char _buffer[BUFFER_LEN]; |
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91 int _indent_level; |
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92 int _cur; |
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93 |
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94 void vappend(const char* format, va_list ap) { |
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95 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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96 if (res != -1) { |
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97 _cur += res; |
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98 } else { |
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99 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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100 _buffer[BUFFER_LEN -1] = 0; |
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101 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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102 } |
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103 } |
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104 |
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105 public: |
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106 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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107 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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108 _buffer[_cur] = ' '; |
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109 } |
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110 } |
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111 |
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112 #ifndef PRODUCT |
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113 ~LineBuffer() { |
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114 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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115 } |
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116 #endif |
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117 |
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118 void append(const char* format, ...) { |
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119 va_list ap; |
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120 va_start(ap, format); |
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121 vappend(format, ap); |
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122 va_end(ap); |
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123 } |
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124 |
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125 void append_and_print_cr(const char* format, ...) { |
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126 va_list ap; |
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127 va_start(ap, format); |
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128 vappend(format, ap); |
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129 va_end(ap); |
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130 gclog_or_tty->print_cr("%s", _buffer); |
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131 _cur = _indent_level * INDENT_CHARS; |
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132 } |
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133 }; |
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134 |
342 | 135 G1CollectorPolicy::G1CollectorPolicy() : |
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136 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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137 ? ParallelGCThreads : 1), |
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138 |
342 | 139 _n_pauses(0), |
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140 _recent_rs_scan_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
342 | 141 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
142 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
143 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
144 _all_pause_times_ms(new NumberSeq()), | |
145 _stop_world_start(0.0), | |
146 _all_stop_world_times_ms(new NumberSeq()), | |
147 _all_yield_times_ms(new NumberSeq()), | |
148 | |
149 _all_mod_union_times_ms(new NumberSeq()), | |
150 | |
677 | 151 _summary(new Summary()), |
342 | 152 |
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153 #ifndef PRODUCT |
342 | 154 _cur_clear_ct_time_ms(0.0), |
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155 _min_clear_cc_time_ms(-1.0), |
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156 _max_clear_cc_time_ms(-1.0), |
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157 _cur_clear_cc_time_ms(0.0), |
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158 _cum_clear_cc_time_ms(0.0), |
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159 _num_cc_clears(0L), |
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160 #endif |
342 | 161 |
162 _region_num_young(0), | |
163 _region_num_tenured(0), | |
164 _prev_region_num_young(0), | |
165 _prev_region_num_tenured(0), | |
166 | |
167 _aux_num(10), | |
168 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
169 _cur_aux_start_times_ms(new double[_aux_num]), | |
170 _cur_aux_times_ms(new double[_aux_num]), | |
171 _cur_aux_times_set(new bool[_aux_num]), | |
172 | |
173 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
174 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
175 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
176 | |
177 // <NEW PREDICTION> | |
178 | |
179 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
180 _prev_collection_pause_end_ms(0.0), | |
181 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
182 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
184 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
185 _partially_young_cards_per_entry_ratio_seq( | |
186 new TruncatedSeq(TruncatedSeqLength)), | |
187 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
188 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
189 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
190 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
191 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
192 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
193 _non_young_other_cost_per_region_ms_seq( | |
194 new TruncatedSeq(TruncatedSeqLength)), | |
195 | |
196 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
197 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
198 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
199 | |
751 | 200 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 201 |
202 // </NEW PREDICTION> | |
203 | |
204 _in_young_gc_mode(false), | |
205 _full_young_gcs(true), | |
206 _full_young_pause_num(0), | |
207 _partial_young_pause_num(0), | |
208 | |
209 _during_marking(false), | |
210 _in_marking_window(false), | |
211 _in_marking_window_im(false), | |
212 | |
213 _known_garbage_ratio(0.0), | |
214 _known_garbage_bytes(0), | |
215 | |
216 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
217 | |
218 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
219 | |
220 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
221 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
222 | |
223 _recent_avg_pause_time_ratio(0.0), | |
224 _num_markings(0), | |
225 _n_marks(0), | |
226 _n_pauses_at_mark_end(0), | |
227 | |
228 _all_full_gc_times_ms(new NumberSeq()), | |
229 | |
230 // G1PausesBtwnConcMark defaults to -1 | |
231 // so the hack is to do the cast QQQ FIXME | |
232 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
233 _n_marks_since_last_pause(0), | |
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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 | |
276 _gc_overhead_perc(0.0) | |
545 | 277 |
342 | 278 { |
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279 // Set up the region size and associated fields. Given that the |
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280 // policy is created before the heap, we have to set this up here, |
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281 // so it's done as soon as possible. |
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282 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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283 HeapRegionRemSet::setup_remset_size(); |
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284 |
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285 // Verify PLAB sizes |
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286 const uint region_size = HeapRegion::GrainWords; |
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287 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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288 char buffer[128]; |
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289 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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290 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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291 vm_exit_during_initialization(buffer); |
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292 } |
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293 |
342 | 294 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
295 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
296 | |
1611 | 297 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 298 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
299 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
300 | |
301 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
302 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
303 | |
304 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
305 | |
306 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
307 | |
308 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 309 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
310 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 311 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
342 | 312 |
313 // start conservatively | |
751 | 314 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 315 |
316 // <NEW PREDICTION> | |
317 | |
318 int index; | |
319 if (ParallelGCThreads == 0) | |
320 index = 0; | |
321 else if (ParallelGCThreads > 8) | |
322 index = 7; | |
323 else | |
324 index = ParallelGCThreads - 1; | |
325 | |
326 _pending_card_diff_seq->add(0.0); | |
327 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
328 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
329 _fully_young_cards_per_entry_ratio_seq->add( | |
330 fully_young_cards_per_entry_ratio_defaults[index]); | |
331 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
332 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
333 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
334 _young_other_cost_per_region_ms_seq->add( | |
335 young_other_cost_per_region_ms_defaults[index]); | |
336 _non_young_other_cost_per_region_ms_seq->add( | |
337 non_young_other_cost_per_region_ms_defaults[index]); | |
338 | |
339 // </NEW PREDICTION> | |
340 | |
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341 // Below, we might need to calculate the pause time target based on |
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342 // the pause interval. When we do so we are going to give G1 maximum |
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343 // flexibility and allow it to do pauses when it needs to. So, we'll |
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344 // arrange that the pause interval to be pause time target + 1 to |
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345 // ensure that a) the pause time target is maximized with respect to |
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346 // the pause interval and b) we maintain the invariant that pause |
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347 // time target < pause interval. If the user does not want this |
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348 // maximum flexibility, they will have to set the pause interval |
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349 // explicitly. |
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350 |
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351 // First make sure that, if either parameter is set, its value is |
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352 // reasonable. |
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353 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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354 if (MaxGCPauseMillis < 1) { |
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355 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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356 "greater than 0"); |
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357 } |
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358 } |
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359 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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360 if (GCPauseIntervalMillis < 1) { |
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361 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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362 "greater than 0"); |
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363 } |
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364 } |
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365 |
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366 // Then, if the pause time target parameter was not set, set it to |
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367 // the default value. |
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368 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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369 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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370 // The default pause time target in G1 is 200ms |
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371 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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372 } else { |
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373 // We do not allow the pause interval to be set without the |
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374 // pause time target |
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375 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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376 "without setting MaxGCPauseMillis"); |
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377 } |
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378 } |
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379 |
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380 // Then, if the interval parameter was not set, set it according to |
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381 // the pause time target (this will also deal with the case when the |
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382 // pause time target is the default value). |
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383 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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384 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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385 } |
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386 |
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387 // Finally, make sure that the two parameters are consistent. |
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388 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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389 char buffer[256]; |
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390 jio_snprintf(buffer, 256, |
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391 "MaxGCPauseMillis (%u) should be less than " |
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392 "GCPauseIntervalMillis (%u)", |
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393 MaxGCPauseMillis, GCPauseIntervalMillis); |
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394 vm_exit_during_initialization(buffer); |
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395 } |
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396 |
751 | 397 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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398 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 399 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 400 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 401 |
402 // start conservatively (around 50ms is about right) | |
403 _concurrent_mark_init_times_ms->add(0.05); | |
404 _concurrent_mark_remark_times_ms->add(0.05); | |
405 _concurrent_mark_cleanup_times_ms->add(0.20); | |
406 _tenuring_threshold = MaxTenuringThreshold; | |
407 | |
1282 | 408 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
409 // fixed, then _max_survivor_regions will be calculated at | |
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410 // calculate_young_list_target_length during initialization |
1282 | 411 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 412 |
1356 | 413 assert(GCTimeRatio > 0, |
414 "we should have set it to a default value set_g1_gc_flags() " | |
415 "if a user set it to 0"); | |
416 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
417 | |
342 | 418 initialize_all(); |
419 } | |
420 | |
421 // Increment "i", mod "len" | |
422 static void inc_mod(int& i, int len) { | |
423 i++; if (i == len) i = 0; | |
424 } | |
425 | |
426 void G1CollectorPolicy::initialize_flags() { | |
427 set_min_alignment(HeapRegion::GrainBytes); | |
428 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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429 if (SurvivorRatio < 1) { |
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430 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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431 } |
342 | 432 CollectorPolicy::initialize_flags(); |
433 } | |
434 | |
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435 // The easiest way to deal with the parsing of the NewSize / |
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436 // MaxNewSize / etc. parameteres is to re-use the code in the |
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437 // TwoGenerationCollectorPolicy class. This is similar to what |
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438 // ParallelScavenge does with its GenerationSizer class (see |
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439 // ParallelScavengeHeap::initialize()). We might change this in the |
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440 // future, but it's a good start. |
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441 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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442 size_t size_to_region_num(size_t byte_size) { |
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443 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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444 } |
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445 |
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446 public: |
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447 G1YoungGenSizer() { |
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448 initialize_flags(); |
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449 initialize_size_info(); |
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450 } |
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451 |
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452 size_t min_young_region_num() { |
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453 return size_to_region_num(_min_gen0_size); |
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454 } |
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455 size_t initial_young_region_num() { |
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456 return size_to_region_num(_initial_gen0_size); |
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457 } |
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458 size_t max_young_region_num() { |
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459 return size_to_region_num(_max_gen0_size); |
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460 } |
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461 }; |
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462 |
342 | 463 void G1CollectorPolicy::init() { |
464 // Set aside an initial future to_space. | |
465 _g1 = G1CollectedHeap::heap(); | |
466 | |
467 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
468 | |
545 | 469 initialize_gc_policy_counters(); |
470 | |
342 | 471 if (G1Gen) { |
472 _in_young_gc_mode = true; | |
473 | |
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474 G1YoungGenSizer sizer; |
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475 size_t initial_region_num = sizer.initial_young_region_num(); |
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476 |
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477 if (UseAdaptiveSizePolicy) { |
342 | 478 set_adaptive_young_list_length(true); |
479 _young_list_fixed_length = 0; | |
480 } else { | |
481 set_adaptive_young_list_length(false); | |
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482 _young_list_fixed_length = initial_region_num; |
342 | 483 } |
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484 _free_regions_at_end_of_collection = _g1->free_regions(); |
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485 calculate_young_list_min_length(); |
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486 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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487 calculate_young_list_target_length(); |
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488 } else { |
342 | 489 _young_list_fixed_length = 0; |
490 _in_young_gc_mode = false; | |
491 } | |
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492 |
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493 // We may immediately start allocating regions and placing them on the |
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494 // collection set list. Initialize the per-collection set info |
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495 start_incremental_cset_building(); |
342 | 496 } |
497 | |
545 | 498 // Create the jstat counters for the policy. |
499 void G1CollectorPolicy::initialize_gc_policy_counters() | |
500 { | |
501 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
502 } | |
503 | |
342 | 504 void G1CollectorPolicy::calculate_young_list_min_length() { |
505 _young_list_min_length = 0; | |
506 | |
507 if (!adaptive_young_list_length()) | |
508 return; | |
509 | |
510 if (_alloc_rate_ms_seq->num() > 3) { | |
511 double now_sec = os::elapsedTime(); | |
512 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
513 double alloc_rate_ms = predict_alloc_rate_ms(); | |
1973 | 514 size_t min_regions = (size_t) ceil(alloc_rate_ms * when_ms); |
515 size_t current_region_num = _g1->young_list()->length(); | |
342 | 516 _young_list_min_length = min_regions + current_region_num; |
517 } | |
518 } | |
519 | |
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520 void G1CollectorPolicy::calculate_young_list_target_length() { |
342 | 521 if (adaptive_young_list_length()) { |
522 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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523 calculate_young_list_target_length(rs_lengths); |
342 | 524 } else { |
525 if (full_young_gcs()) | |
526 _young_list_target_length = _young_list_fixed_length; | |
527 else | |
528 _young_list_target_length = _young_list_fixed_length / 2; | |
529 } | |
1973 | 530 |
531 // Make sure we allow the application to allocate at least one | |
532 // region before we need to do a collection again. | |
533 size_t min_length = _g1->young_list()->length() + 1; | |
534 _young_list_target_length = MAX2(_young_list_target_length, min_length); | |
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535 calculate_max_gc_locker_expansion(); |
545 | 536 calculate_survivors_policy(); |
342 | 537 } |
538 | |
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539 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
342 | 540 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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541 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
342 | 542 |
543 double start_time_sec = os::elapsedTime(); | |
1282 | 544 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
342 | 545 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
546 size_t reserve_regions = | |
547 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
548 | |
549 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
550 // we are in fully-young mode and there are free regions in the heap | |
551 | |
545 | 552 double survivor_regions_evac_time = |
553 predict_survivor_regions_evac_time(); | |
554 | |
342 | 555 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
556 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
557 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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558 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
545 | 559 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
560 + survivor_regions_evac_time; | |
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561 |
342 | 562 // the result |
563 size_t final_young_length = 0; | |
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564 |
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565 size_t init_free_regions = |
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566 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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567 |
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568 // if we're still under the pause target... |
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569 if (base_time_ms <= target_pause_time_ms) { |
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570 // We make sure that the shortest young length that makes sense |
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571 // fits within the target pause time. |
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572 size_t min_young_length = 1; |
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573 |
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574 if (predict_will_fit(min_young_length, base_time_ms, |
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575 init_free_regions, target_pause_time_ms)) { |
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576 // The shortest young length will fit within the target pause time; |
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577 // we'll now check whether the absolute maximum number of young |
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578 // regions will fit in the target pause time. If not, we'll do |
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579 // a binary search between min_young_length and max_young_length |
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580 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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581 size_t max_young_length = abs_max_young_length; |
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582 |
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583 if (max_young_length > min_young_length) { |
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584 // Let's check if the initial max young length will fit within the |
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585 // target pause. If so then there is no need to search for a maximal |
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586 // young length - we'll return the initial maximum |
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587 |
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588 if (predict_will_fit(max_young_length, base_time_ms, |
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589 init_free_regions, target_pause_time_ms)) { |
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590 // The maximum young length will satisfy the target pause time. |
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591 // We are done so set min young length to this maximum length. |
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592 // The code after the loop will then set final_young_length using |
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593 // the value cached in the minimum length. |
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594 min_young_length = max_young_length; |
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595 } else { |
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596 // The maximum possible number of young regions will not fit within |
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597 // the target pause time so let's search.... |
342 | 598 |
599 size_t diff = (max_young_length - min_young_length) / 2; | |
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600 max_young_length = min_young_length + diff; |
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601 |
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602 while (max_young_length > min_young_length) { |
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603 if (predict_will_fit(max_young_length, base_time_ms, |
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604 init_free_regions, target_pause_time_ms)) { |
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605 |
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606 // The current max young length will fit within the target |
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607 // pause time. Note we do not exit the loop here. By setting |
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608 // min = max, and then increasing the max below means that |
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609 // we will continue searching for an upper bound in the |
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610 // range [max..max+diff] |
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611 min_young_length = max_young_length; |
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612 } |
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613 diff = (max_young_length - min_young_length) / 2; |
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614 max_young_length = min_young_length + diff; |
342 | 615 } |
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616 // the above loop found a maximal young length that will fit |
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617 // within the target pause time. |
342 | 618 } |
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619 assert(min_young_length <= abs_max_young_length, "just checking"); |
342 | 620 } |
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621 final_young_length = min_young_length; |
342 | 622 } |
623 } | |
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624 // and we're done! |
342 | 625 |
626 // we should have at least one region in the target young length | |
545 | 627 _young_list_target_length = |
1973 | 628 final_young_length + _recorded_survivor_regions; |
342 | 629 |
630 // let's keep an eye of how long we spend on this calculation | |
631 // right now, I assume that we'll print it when we need it; we | |
632 // should really adde it to the breakdown of a pause | |
633 double end_time_sec = os::elapsedTime(); | |
634 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
635 | |
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636 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 637 // leave this in for debugging, just in case |
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638 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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639 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
342 | 640 target_pause_time_ms, |
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641 _young_list_target_length |
342 | 642 elapsed_time_ms, |
643 full_young_gcs() ? "full" : "partial", | |
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644 during_initial_mark_pause() ? " i-m" : "", |
545 | 645 _in_marking_window, |
646 _in_marking_window_im); | |
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647 #endif // TRACE_CALC_YOUNG_LENGTH |
342 | 648 |
649 if (_young_list_target_length < _young_list_min_length) { | |
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650 // bummer; this means that, if we do a pause when the maximal |
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651 // length dictates, we'll violate the pause spacing target (the |
342 | 652 // min length was calculate based on the application's current |
653 // alloc rate); | |
654 | |
655 // so, we have to bite the bullet, and allocate the minimum | |
656 // number. We'll violate our target, but we just can't meet it. | |
657 | |
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658 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 659 // leave this in for debugging, just in case |
660 gclog_or_tty->print_cr("adjusted target length from " | |
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661 SIZE_FORMAT " to " SIZE_FORMAT, |
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662 _young_list_target_length, _young_list_min_length); |
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663 #endif // TRACE_CALC_YOUNG_LENGTH |
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664 |
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665 _young_list_target_length = _young_list_min_length; |
342 | 666 } |
667 } else { | |
668 // we are in a partially-young mode or we've run out of regions (due | |
669 // to evacuation failure) | |
670 | |
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671 #ifdef TRACE_CALC_YOUNG_LENGTH |
342 | 672 // leave this in for debugging, just in case |
673 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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674 _young_list_min_length); |
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675 #endif // TRACE_CALC_YOUNG_LENGTH |
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676 // we'll do the pause as soon as possible by choosing the minimum |
1973 | 677 _young_list_target_length = _young_list_min_length; |
342 | 678 } |
679 | |
680 _rs_lengths_prediction = rs_lengths; | |
681 } | |
682 | |
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683 // This is used by: calculate_young_list_target_length(rs_length). It |
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684 // returns true iff: |
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685 // the predicted pause time for the given young list will not overflow |
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686 // the target pause time |
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687 // and: |
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688 // the predicted amount of surviving data will not overflow the |
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689 // the amount of free space available for survivor regions. |
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690 // |
342 | 691 bool |
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692 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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693 double base_time_ms, |
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694 size_t init_free_regions, |
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695 double target_pause_time_ms) { |
342 | 696 |
697 if (young_length >= init_free_regions) | |
698 // end condition 1: not enough space for the young regions | |
699 return false; | |
700 | |
701 double accum_surv_rate_adj = 0.0; | |
702 double accum_surv_rate = | |
703 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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704 |
342 | 705 size_t bytes_to_copy = |
706 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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707 |
342 | 708 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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709 |
342 | 710 double young_other_time_ms = |
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711 predict_young_other_time_ms(young_length); |
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712 |
342 | 713 double pause_time_ms = |
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714 base_time_ms + copy_time_ms + young_other_time_ms; |
342 | 715 |
716 if (pause_time_ms > target_pause_time_ms) | |
717 // end condition 2: over the target pause time | |
718 return false; | |
719 | |
720 size_t free_bytes = | |
721 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
722 | |
723 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
724 // end condition 3: out of to-space (conservatively) | |
725 return false; | |
726 | |
727 // success! | |
728 return true; | |
729 } | |
730 | |
545 | 731 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
732 double survivor_regions_evac_time = 0.0; | |
733 for (HeapRegion * r = _recorded_survivor_head; | |
734 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
735 r = r->get_next_young_region()) { | |
736 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
737 } | |
738 return survivor_regions_evac_time; | |
739 } | |
740 | |
342 | 741 void G1CollectorPolicy::check_prediction_validity() { |
742 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
743 | |
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744 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 745 if (rs_lengths > _rs_lengths_prediction) { |
746 // add 10% to avoid having to recalculate often | |
747 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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748 calculate_young_list_target_length(rs_lengths_prediction); |
342 | 749 } |
750 } | |
751 | |
752 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
753 bool is_tlab, | |
754 bool* gc_overhead_limit_was_exceeded) { | |
755 guarantee(false, "Not using this policy feature yet."); | |
756 return NULL; | |
757 } | |
758 | |
759 // This method controls how a collector handles one or more | |
760 // of its generations being fully allocated. | |
761 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
762 bool is_tlab) { | |
763 guarantee(false, "Not using this policy feature yet."); | |
764 return NULL; | |
765 } | |
766 | |
767 | |
768 #ifndef PRODUCT | |
769 bool G1CollectorPolicy::verify_young_ages() { | |
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770 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 771 return |
772 verify_young_ages(head, _short_lived_surv_rate_group); | |
773 // also call verify_young_ages on any additional surv rate groups | |
774 } | |
775 | |
776 bool | |
777 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
778 SurvRateGroup *surv_rate_group) { | |
779 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
780 | |
781 const char* name = surv_rate_group->name(); | |
782 bool ret = true; | |
783 int prev_age = -1; | |
784 | |
785 for (HeapRegion* curr = head; | |
786 curr != NULL; | |
787 curr = curr->get_next_young_region()) { | |
788 SurvRateGroup* group = curr->surv_rate_group(); | |
789 if (group == NULL && !curr->is_survivor()) { | |
790 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
791 ret = false; | |
792 } | |
793 | |
794 if (surv_rate_group == group) { | |
795 int age = curr->age_in_surv_rate_group(); | |
796 | |
797 if (age < 0) { | |
798 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
799 ret = false; | |
800 } | |
801 | |
802 if (age <= prev_age) { | |
803 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
804 "(%d, %d)", name, age, prev_age); | |
805 ret = false; | |
806 } | |
807 prev_age = age; | |
808 } | |
809 } | |
810 | |
811 return ret; | |
812 } | |
813 #endif // PRODUCT | |
814 | |
815 void G1CollectorPolicy::record_full_collection_start() { | |
816 _cur_collection_start_sec = os::elapsedTime(); | |
817 // Release the future to-space so that it is available for compaction into. | |
818 _g1->set_full_collection(); | |
819 } | |
820 | |
821 void G1CollectorPolicy::record_full_collection_end() { | |
822 // Consider this like a collection pause for the purposes of allocation | |
823 // since last pause. | |
824 double end_sec = os::elapsedTime(); | |
825 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
826 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
827 | |
828 _all_full_gc_times_ms->add(full_gc_time_ms); | |
829 | |
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830 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 831 |
832 _g1->clear_full_collection(); | |
833 | |
834 // "Nuke" the heuristics that control the fully/partially young GC | |
835 // transitions and make sure we start with fully young GCs after the | |
836 // Full GC. | |
837 set_full_young_gcs(true); | |
838 _last_full_young_gc = false; | |
839 _should_revert_to_full_young_gcs = false; | |
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840 clear_initiate_conc_mark_if_possible(); |
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841 clear_during_initial_mark_pause(); |
342 | 842 _known_garbage_bytes = 0; |
843 _known_garbage_ratio = 0.0; | |
844 _in_marking_window = false; | |
845 _in_marking_window_im = false; | |
846 | |
847 _short_lived_surv_rate_group->start_adding_regions(); | |
848 // also call this on any additional surv rate groups | |
849 | |
545 | 850 record_survivor_regions(0, NULL, NULL); |
851 | |
342 | 852 _prev_region_num_young = _region_num_young; |
853 _prev_region_num_tenured = _region_num_tenured; | |
854 | |
855 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 856 // Reset survivors SurvRateGroup. |
857 _survivor_surv_rate_group->reset(); | |
342 | 858 calculate_young_list_min_length(); |
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859 calculate_young_list_target_length(); |
1973 | 860 } |
342 | 861 |
862 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
863 _bytes_in_to_space_before_gc += bytes; | |
864 } | |
865 | |
866 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
867 _bytes_in_to_space_after_gc += bytes; | |
868 } | |
869 | |
870 void G1CollectorPolicy::record_stop_world_start() { | |
871 _stop_world_start = os::elapsedTime(); | |
872 } | |
873 | |
874 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
875 size_t start_used) { | |
876 if (PrintGCDetails) { | |
877 gclog_or_tty->stamp(PrintGCTimeStamps); | |
878 gclog_or_tty->print("[GC pause"); | |
879 if (in_young_gc_mode()) | |
880 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
881 } | |
882 | |
1973 | 883 assert(_g1->used() == _g1->recalculate_used(), |
884 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
885 _g1->used(), _g1->recalculate_used())); | |
342 | 886 |
887 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
888 _all_stop_world_times_ms->add(s_w_t_ms); | |
889 _stop_world_start = 0.0; | |
890 | |
891 _cur_collection_start_sec = start_time_sec; | |
892 _cur_collection_pause_used_at_start_bytes = start_used; | |
893 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
894 _pending_cards = _g1->pending_card_num(); | |
895 _max_pending_cards = _g1->max_pending_card_num(); | |
896 | |
897 _bytes_in_to_space_before_gc = 0; | |
898 _bytes_in_to_space_after_gc = 0; | |
899 _bytes_in_collection_set_before_gc = 0; | |
900 | |
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901 YoungList* young_list = _g1->young_list(); |
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902 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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903 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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904 _capacity_before_gc = _g1->capacity(); |
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905 |
342 | 906 #ifdef DEBUG |
907 // initialise these to something well known so that we can spot | |
908 // if they are not set properly | |
909 | |
910 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 911 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
912 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
913 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
914 _par_last_update_rs_times_ms[i] = -1234.0; | |
915 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
916 _par_last_scan_rs_times_ms[i] = -1234.0; | |
917 _par_last_obj_copy_times_ms[i] = -1234.0; | |
918 _par_last_termination_times_ms[i] = -1234.0; | |
919 _par_last_termination_attempts[i] = -1234.0; | |
920 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 921 _par_last_gc_worker_times_ms[i] = -1234.0; |
342 | 922 } |
923 #endif | |
924 | |
925 for (int i = 0; i < _aux_num; ++i) { | |
926 _cur_aux_times_ms[i] = 0.0; | |
927 _cur_aux_times_set[i] = false; | |
928 } | |
929 | |
930 _satb_drain_time_set = false; | |
931 _last_satb_drain_processed_buffers = -1; | |
932 | |
933 if (in_young_gc_mode()) | |
934 _last_young_gc_full = false; | |
935 | |
936 // do that for any other surv rate groups | |
937 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 938 _survivors_age_table.clear(); |
545 | 939 |
342 | 940 assert( verify_young_ages(), "region age verification" ); |
941 } | |
942 | |
943 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
944 _mark_closure_time_ms = mark_closure_time_ms; | |
945 } | |
946 | |
947 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
948 _mark_init_start_sec = os::elapsedTime(); | |
949 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
950 } | |
951 | |
952 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
953 mark_init_elapsed_time_ms) { | |
954 _during_marking = true; | |
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955 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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956 clear_during_initial_mark_pause(); |
342 | 957 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
958 } | |
959 | |
960 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
961 double end_time_sec = os::elapsedTime(); | |
962 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
963 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
964 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
965 | |
966 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
967 } | |
968 | |
969 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
970 _mark_remark_start_sec = os::elapsedTime(); | |
971 _during_marking = false; | |
972 } | |
973 | |
974 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
975 double end_time_sec = os::elapsedTime(); | |
976 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
977 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
978 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
979 _prev_collection_pause_end_ms += elapsed_time_ms; | |
980 | |
981 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
982 } | |
983 | |
984 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
985 _mark_cleanup_start_sec = os::elapsedTime(); | |
986 } | |
987 | |
988 void | |
989 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
990 size_t max_live_bytes) { | |
991 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
992 record_concurrent_mark_cleanup_end_work2(); | |
993 } | |
994 | |
995 void | |
996 G1CollectorPolicy:: | |
997 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
998 size_t max_live_bytes) { | |
999 if (_n_marks < 2) _n_marks++; | |
1000 if (G1PolicyVerbose > 0) | |
1001 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
1002 " (of " SIZE_FORMAT " MB heap).", | |
1003 max_live_bytes/M, _g1->capacity()/M); | |
1004 } | |
1005 | |
1006 // The important thing about this is that it includes "os::elapsedTime". | |
1007 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
1008 double end_time_sec = os::elapsedTime(); | |
1009 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
1010 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1011 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1012 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1013 | |
1014 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
1015 | |
1016 _num_markings++; | |
1017 | |
1018 // We did a marking, so reset the "since_last_mark" variables. | |
1019 double considerConcMarkCost = 1.0; | |
1020 // If there are available processors, concurrent activity is free... | |
1021 if (Threads::number_of_non_daemon_threads() * 2 < | |
1022 os::active_processor_count()) { | |
1023 considerConcMarkCost = 0.0; | |
1024 } | |
1025 _n_pauses_at_mark_end = _n_pauses; | |
1026 _n_marks_since_last_pause++; | |
1027 } | |
1028 | |
1029 void | |
1030 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
1031 if (in_young_gc_mode()) { | |
1032 _should_revert_to_full_young_gcs = false; | |
1033 _last_full_young_gc = true; | |
1034 _in_marking_window = false; | |
1035 if (adaptive_young_list_length()) | |
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1036 calculate_young_list_target_length(); |
342 | 1037 } |
1038 } | |
1039 | |
1040 void G1CollectorPolicy::record_concurrent_pause() { | |
1041 if (_stop_world_start > 0.0) { | |
1042 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1043 _all_yield_times_ms->add(yield_ms); | |
1044 } | |
1045 } | |
1046 | |
1047 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1048 } | |
1049 | |
1050 template<class T> | |
1051 T sum_of(T* sum_arr, int start, int n, int N) { | |
1052 T sum = (T)0; | |
1053 for (int i = 0; i < n; i++) { | |
1054 int j = (start + i) % N; | |
1055 sum += sum_arr[j]; | |
1056 } | |
1057 return sum; | |
1058 } | |
1059 | |
1611 | 1060 void G1CollectorPolicy::print_par_stats(int level, |
1061 const char* str, | |
2430 | 1062 double* data) { |
342 | 1063 double min = data[0], max = data[0]; |
1064 double total = 0.0; | |
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1065 LineBuffer buf(level); |
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1066 buf.append("[%s (ms):", str); |
342 | 1067 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1068 double val = data[i]; | |
1069 if (val < min) | |
1070 min = val; | |
1071 if (val > max) | |
1072 max = val; | |
1073 total += val; | |
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1074 buf.append(" %3.1lf", val); |
342 | 1075 } |
2430 | 1076 buf.append_and_print_cr(""); |
1077 double avg = total / (double) ParallelGCThreads; | |
1078 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
1079 avg, min, max, max - min); | |
342 | 1080 } |
1081 | |
1611 | 1082 void G1CollectorPolicy::print_par_sizes(int level, |
1083 const char* str, | |
2430 | 1084 double* data) { |
342 | 1085 double min = data[0], max = data[0]; |
1086 double total = 0.0; | |
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1087 LineBuffer buf(level); |
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1088 buf.append("[%s :", str); |
342 | 1089 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1090 double val = data[i]; | |
1091 if (val < min) | |
1092 min = val; | |
1093 if (val > max) | |
1094 max = val; | |
1095 total += val; | |
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1096 buf.append(" %d", (int) val); |
342 | 1097 } |
2430 | 1098 buf.append_and_print_cr(""); |
1099 double avg = total / (double) ParallelGCThreads; | |
1100 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
1101 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1102 } |
1103 | |
1104 void G1CollectorPolicy::print_stats (int level, | |
1105 const char* str, | |
1106 double value) { | |
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1107 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1108 } |
1109 | |
1110 void G1CollectorPolicy::print_stats (int level, | |
1111 const char* str, | |
1112 int value) { | |
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1113 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1114 } |
1115 | |
1116 double G1CollectorPolicy::avg_value (double* data) { | |
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1117 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1118 double ret = 0.0; |
1119 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1120 ret += data[i]; | |
1121 return ret / (double) ParallelGCThreads; | |
1122 } else { | |
1123 return data[0]; | |
1124 } | |
1125 } | |
1126 | |
1127 double G1CollectorPolicy::max_value (double* data) { | |
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1128 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1129 double ret = data[0]; |
1130 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1131 if (data[i] > ret) | |
1132 ret = data[i]; | |
1133 return ret; | |
1134 } else { | |
1135 return data[0]; | |
1136 } | |
1137 } | |
1138 | |
1139 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1140 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1141 double sum = 0.0; |
1142 for (uint i = 0; i < ParallelGCThreads; i++) | |
1143 sum += data[i]; | |
1144 return sum; | |
1145 } else { | |
1146 return data[0]; | |
1147 } | |
1148 } | |
1149 | |
1150 double G1CollectorPolicy::max_sum (double* data1, | |
1151 double* data2) { | |
1152 double ret = data1[0] + data2[0]; | |
1153 | |
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1154 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1155 for (uint i = 1; i < ParallelGCThreads; ++i) { |
1156 double data = data1[i] + data2[i]; | |
1157 if (data > ret) | |
1158 ret = data; | |
1159 } | |
1160 } | |
1161 return ret; | |
1162 } | |
1163 | |
1164 // Anything below that is considered to be zero | |
1165 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1166 | |
1707 | 1167 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1168 double end_time_sec = os::elapsedTime(); |
1169 double elapsed_ms = _last_pause_time_ms; | |
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1170 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1171 size_t rs_size = |
1172 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1173 size_t cur_used_bytes = _g1->used(); | |
1174 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1175 bool last_pause_included_initial_mark = false; | |
1707 | 1176 bool update_stats = !_g1->evacuation_failed(); |
342 | 1177 |
1178 #ifndef PRODUCT | |
1179 if (G1YoungSurvRateVerbose) { | |
1180 gclog_or_tty->print_cr(""); | |
1181 _short_lived_surv_rate_group->print(); | |
1182 // do that for any other surv rate groups too | |
1183 } | |
1184 #endif // PRODUCT | |
1185 | |
1186 if (in_young_gc_mode()) { | |
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1187 last_pause_included_initial_mark = during_initial_mark_pause(); |
342 | 1188 if (last_pause_included_initial_mark) |
1189 record_concurrent_mark_init_end_pre(0.0); | |
1190 | |
1191 size_t min_used_targ = | |
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1192 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
342 | 1193 |
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1194 |
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1195 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1196 assert(!last_pause_included_initial_mark, "invariant"); |
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1197 if (cur_used_bytes > min_used_targ && |
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1198 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1199 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1200 |
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1201 // Note: this might have already been set, if during the last |
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1202 // pause we decided to start a cycle but at the beginning of |
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1203 // this pause we decided to postpone it. That's OK. |
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1204 set_initiate_conc_mark_if_possible(); |
342 | 1205 } |
1206 } | |
1207 | |
1208 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
1209 } | |
1210 | |
1211 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
1212 end_time_sec, false); | |
1213 | |
1214 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1215 collection_set_size(), | |
1216 "Negative RS size?"); | |
1217 | |
1218 // This assert is exempted when we're doing parallel collection pauses, | |
1219 // because the fragmentation caused by the parallel GC allocation buffers | |
1220 // can lead to more memory being used during collection than was used | |
1221 // before. Best leave this out until the fragmentation problem is fixed. | |
1222 // Pauses in which evacuation failed can also lead to negative | |
1223 // collections, since no space is reclaimed from a region containing an | |
1224 // object whose evacuation failed. | |
1225 // Further, we're now always doing parallel collection. But I'm still | |
1226 // leaving this here as a placeholder for a more precise assertion later. | |
1227 // (DLD, 10/05.) | |
1228 assert((true || parallel) // Always using GC LABs now. | |
1229 || _g1->evacuation_failed() | |
1230 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1231 "Negative collection"); | |
1232 | |
1233 size_t freed_bytes = | |
1234 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1235 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1236 |
342 | 1237 double survival_fraction = |
1238 (double)surviving_bytes/ | |
1239 (double)_collection_set_bytes_used_before; | |
1240 | |
1241 _n_pauses++; | |
1242 | |
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1243 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1244 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1245 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1246 double update_rs_processed_buffers = |
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1247 sum_of_values(_par_last_update_rs_processed_buffers); |
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1248 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1249 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1250 double termination_time = avg_value(_par_last_termination_times_ms); |
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1251 |
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1252 double parallel_known_time = update_rs_time + |
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1253 ext_root_scan_time + |
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1254 mark_stack_scan_time + |
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1255 scan_rs_time + |
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1256 obj_copy_time + |
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1257 termination_time; |
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1258 |
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1259 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; |
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1260 |
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1261 PauseSummary* summary = _summary; |
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1262 |
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1263 if (update_stats) { |
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1264 _recent_rs_scan_times_ms->add(scan_rs_time); |
342 | 1265 _recent_pause_times_ms->add(elapsed_ms); |
1266 _recent_rs_sizes->add(rs_size); | |
1267 | |
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1268 MainBodySummary* body_summary = summary->main_body_summary(); |
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1269 guarantee(body_summary != NULL, "should not be null!"); |
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1270 |
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1271 if (_satb_drain_time_set) |
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1272 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
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1273 else |
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1274 body_summary->record_satb_drain_time_ms(0.0); |
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1275 |
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1276 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1277 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1278 body_summary->record_update_rs_time_ms(update_rs_time); |
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1279 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1280 body_summary->record_obj_copy_time_ms(obj_copy_time); |
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1281 if (parallel) { |
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1282 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1283 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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1284 body_summary->record_termination_time_ms(termination_time); |
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1285 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1286 } |
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1287 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
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1288 |
342 | 1289 // We exempt parallel collection from this check because Alloc Buffer |
1290 // fragmentation can produce negative collections. Same with evac | |
1291 // failure. | |
1292 // Further, we're now always doing parallel collection. But I'm still | |
1293 // leaving this here as a placeholder for a more precise assertion later. | |
1294 // (DLD, 10/05. | |
1295 assert((true || parallel) | |
1296 || _g1->evacuation_failed() | |
1297 || surviving_bytes <= _collection_set_bytes_used_before, | |
1298 "Or else negative collection!"); | |
1299 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1300 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1301 | |
1302 // this is where we update the allocation rate of the application | |
1303 double app_time_ms = | |
1304 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1305 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1306 // This usually happens due to the timer not having the required | |
1307 // granularity. Some Linuxes are the usual culprits. | |
1308 // We'll just set it to something (arbitrarily) small. | |
1309 app_time_ms = 1.0; | |
1310 } | |
1311 size_t regions_allocated = | |
1312 (_region_num_young - _prev_region_num_young) + | |
1313 (_region_num_tenured - _prev_region_num_tenured); | |
1314 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1315 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1316 _prev_region_num_young = _region_num_young; | |
1317 _prev_region_num_tenured = _region_num_tenured; | |
1318 | |
1319 double interval_ms = | |
1320 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1321 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1322 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
1086
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1323 if (recent_avg_pause_time_ratio() < 0.0 || |
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1324 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1325 #ifndef PRODUCT |
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1326 // Dump info to allow post-facto debugging |
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1327 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1328 gclog_or_tty->print_cr("-------------------------------------------"); |
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1329 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1330 _recent_gc_times_ms->dump(); |
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1331 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1332 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1333 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1334 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1335 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1336 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1337 #endif // !PRODUCT |
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1338 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1339 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1340 if (_recent_avg_pause_time_ratio < 0.0) { |
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1341 _recent_avg_pause_time_ratio = 0.0; |
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1342 } else { |
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1343 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1344 _recent_avg_pause_time_ratio = 1.0; |
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1345 } |
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1346 } |
342 | 1347 } |
1348 | |
1349 if (G1PolicyVerbose > 1) { | |
1350 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1351 } | |
1352 | |
1353 if (G1PolicyVerbose > 1) { | |
1354 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1355 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1356 " |RS|: " SIZE_FORMAT, | |
1357 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
3823
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1358 scan_rs_time, recent_avg_time_for_rs_scan_ms(), |
342 | 1359 rs_size); |
1360 | |
1361 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1362 " At end " SIZE_FORMAT "K\n" | |
1363 " garbage : " SIZE_FORMAT "K" | |
1364 " of " SIZE_FORMAT "K\n" | |
1365 " survival : %6.2f%% (%6.2f%% avg)", | |
1366 _cur_collection_pause_used_at_start_bytes/K, | |
1367 _g1->used()/K, freed_bytes/K, | |
1368 _collection_set_bytes_used_before/K, | |
1369 survival_fraction*100.0, | |
1370 recent_avg_survival_fraction()*100.0); | |
1371 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1372 recent_avg_pause_time_ratio() * 100.0); | |
1373 } | |
1374 | |
1375 double other_time_ms = elapsed_ms; | |
1376 | |
1707 | 1377 if (_satb_drain_time_set) { |
1378 other_time_ms -= _cur_satb_drain_time_ms; | |
1379 } | |
1380 | |
1381 if (parallel) { | |
1382 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1383 } else { | |
1384 other_time_ms -= | |
1385 update_rs_time + | |
1386 ext_root_scan_time + mark_stack_scan_time + | |
1387 scan_rs_time + obj_copy_time; | |
342 | 1388 } |
1389 | |
1390 if (PrintGCDetails) { | |
1707 | 1391 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1392 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1393 elapsed_ms / 1000.0); | |
1394 | |
1707 | 1395 if (_satb_drain_time_set) { |
1396 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1397 } | |
1398 if (_last_satb_drain_processed_buffers >= 0) { | |
1399 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1400 } | |
1401 if (parallel) { | |
1402 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
2430 | 1403 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
1707 | 1404 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1405 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1406 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1407 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1707 | 1408 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1409 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1410 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1411 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1412 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
1413 | |
1414 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1415 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
1416 } | |
1417 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
1418 | |
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1419 print_stats(2, "Parallel Other", parallel_other_time); |
1707 | 1420 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
1421 } else { | |
1422 print_stats(1, "Update RS", update_rs_time); | |
1423 print_stats(2, "Processed Buffers", | |
1424 (int)update_rs_processed_buffers); | |
1425 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1426 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1427 print_stats(1, "Scan RS", scan_rs_time); | |
1428 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1429 } |
890
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1430 #ifndef PRODUCT |
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1431 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1432 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1433 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1434 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1435 if (_num_cc_clears > 0) { |
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1436 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1437 } |
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1438 #endif |
342 | 1439 print_stats(1, "Other", other_time_ms); |
1394
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1440 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1441 |
342 | 1442 for (int i = 0; i < _aux_num; ++i) { |
1443 if (_cur_aux_times_set[i]) { | |
1444 char buffer[96]; | |
1445 sprintf(buffer, "Aux%d", i); | |
1446 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1447 } | |
1448 } | |
1449 } | |
1450 | |
1451 _all_pause_times_ms->add(elapsed_ms); | |
648
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1452 if (update_stats) { |
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1453 summary->record_total_time_ms(elapsed_ms); |
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1454 summary->record_other_time_ms(other_time_ms); |
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1455 } |
342 | 1456 for (int i = 0; i < _aux_num; ++i) |
1457 if (_cur_aux_times_set[i]) | |
1458 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1459 | |
1460 // Reset marks-between-pauses counter. | |
1461 _n_marks_since_last_pause = 0; | |
1462 | |
1463 // Update the efficiency-since-mark vars. | |
1464 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1465 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1466 // This usually happens due to the timer not having the required | |
1467 // granularity. Some Linuxes are the usual culprits. | |
1468 // We'll just set it to something (arbitrarily) small. | |
1469 proc_ms = 1.0; | |
1470 } | |
1471 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1472 | |
1473 bool new_in_marking_window = _in_marking_window; | |
1474 bool new_in_marking_window_im = false; | |
1359
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1475 if (during_initial_mark_pause()) { |
342 | 1476 new_in_marking_window = true; |
1477 new_in_marking_window_im = true; | |
1478 } | |
1479 | |
1480 if (in_young_gc_mode()) { | |
1481 if (_last_full_young_gc) { | |
1482 set_full_young_gcs(false); | |
1483 _last_full_young_gc = false; | |
1484 } | |
1485 | |
1486 if ( !_last_young_gc_full ) { | |
1487 if ( _should_revert_to_full_young_gcs || | |
1488 _known_garbage_ratio < 0.05 || | |
1489 (adaptive_young_list_length() && | |
1490 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
1491 set_full_young_gcs(true); | |
1492 } | |
1493 } | |
1494 _should_revert_to_full_young_gcs = false; | |
1495 | |
1496 if (_last_young_gc_full && !_during_marking) | |
1497 _young_gc_eff_seq->add(cur_efficiency); | |
1498 } | |
1499 | |
1500 _short_lived_surv_rate_group->start_adding_regions(); | |
1501 // do that for any other surv rate groupsx | |
1502 | |
1503 // <NEW PREDICTION> | |
1504 | |
677 | 1505 if (update_stats) { |
342 | 1506 double pause_time_ms = elapsed_ms; |
1507 | |
1508 size_t diff = 0; | |
1509 if (_max_pending_cards >= _pending_cards) | |
1510 diff = _max_pending_cards - _pending_cards; | |
1511 _pending_card_diff_seq->add((double) diff); | |
1512 | |
1513 double cost_per_card_ms = 0.0; | |
1514 if (_pending_cards > 0) { | |
1515 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1516 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1517 } | |
1518 | |
1519 size_t cards_scanned = _g1->cards_scanned(); | |
1520 | |
1521 double cost_per_entry_ms = 0.0; | |
1522 if (cards_scanned > 10) { | |
1523 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1524 if (_last_young_gc_full) | |
1525 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1526 else | |
1527 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1528 } | |
1529 | |
1530 if (_max_rs_lengths > 0) { | |
1531 double cards_per_entry_ratio = | |
1532 (double) cards_scanned / (double) _max_rs_lengths; | |
1533 if (_last_young_gc_full) | |
1534 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1535 else | |
1536 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1537 } | |
1538 | |
1539 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1540 if (rs_length_diff >= 0) | |
1541 _rs_length_diff_seq->add((double) rs_length_diff); | |
1542 | |
1543 size_t copied_bytes = surviving_bytes; | |
1544 double cost_per_byte_ms = 0.0; | |
1545 if (copied_bytes > 0) { | |
1546 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1547 if (_in_marking_window) | |
1548 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1549 else | |
1550 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1551 } | |
1552 | |
1553 double all_other_time_ms = pause_time_ms - | |
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1554 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1555 _mark_closure_time_ms + termination_time); |
1556 | |
1557 double young_other_time_ms = 0.0; | |
1558 if (_recorded_young_regions > 0) { | |
1559 young_other_time_ms = | |
1560 _recorded_young_cset_choice_time_ms + | |
1561 _recorded_young_free_cset_time_ms; | |
1562 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1563 (double) _recorded_young_regions); | |
1564 } | |
1565 double non_young_other_time_ms = 0.0; | |
1566 if (_recorded_non_young_regions > 0) { | |
1567 non_young_other_time_ms = | |
1568 _recorded_non_young_cset_choice_time_ms + | |
1569 _recorded_non_young_free_cset_time_ms; | |
1570 | |
1571 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1572 (double) _recorded_non_young_regions); | |
1573 } | |
1574 | |
1575 double constant_other_time_ms = all_other_time_ms - | |
1576 (young_other_time_ms + non_young_other_time_ms); | |
1577 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1578 | |
1579 double survival_ratio = 0.0; | |
1580 if (_bytes_in_collection_set_before_gc > 0) { | |
1581 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
1582 (double) _bytes_in_collection_set_before_gc; | |
1583 } | |
1584 | |
1585 _pending_cards_seq->add((double) _pending_cards); | |
1586 _scanned_cards_seq->add((double) cards_scanned); | |
1587 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1588 | |
1589 double expensive_region_limit_ms = | |
751 | 1590 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1591 if (expensive_region_limit_ms < 0.0) { |
1592 // this means that the other time was predicted to be longer than | |
1593 // than the max pause time | |
751 | 1594 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1595 } |
1596 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1597 | |
1598 if (PREDICTIONS_VERBOSE) { | |
1599 gclog_or_tty->print_cr(""); | |
1600 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1601 "REGIONS %d %d %d " |
342 | 1602 "PENDING_CARDS %d %d " |
1603 "CARDS_SCANNED %d %d " | |
1604 "RS_LENGTHS %d %d " | |
1605 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1606 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1607 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1608 "OTHER_YOUNG %1.6lf %1.6lf " | |
1609 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1610 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1611 "ELAPSED %1.6lf %1.6lf ", | |
1612 _cur_collection_start_sec, | |
1613 (!_last_young_gc_full) ? 2 : | |
1614 (last_pause_included_initial_mark) ? 1 : 0, | |
1615 _recorded_region_num, | |
1616 _recorded_young_regions, | |
1617 _recorded_non_young_regions, | |
1618 _predicted_pending_cards, _pending_cards, | |
1619 _predicted_cards_scanned, cards_scanned, | |
1620 _predicted_rs_lengths, _max_rs_lengths, | |
1621 _predicted_rs_update_time_ms, update_rs_time, | |
1622 _predicted_rs_scan_time_ms, scan_rs_time, | |
1623 _predicted_survival_ratio, survival_ratio, | |
1624 _predicted_object_copy_time_ms, obj_copy_time, | |
1625 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1626 _predicted_young_other_time_ms, young_other_time_ms, | |
1627 _predicted_non_young_other_time_ms, | |
1628 non_young_other_time_ms, | |
1629 _vtime_diff_ms, termination_time, | |
1630 _predicted_pause_time_ms, elapsed_ms); | |
1631 } | |
1632 | |
1633 if (G1PolicyVerbose > 0) { | |
1634 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1635 _predicted_pause_time_ms, | |
1636 (_within_target) ? "within" : "outside", | |
1637 elapsed_ms); | |
1638 } | |
1639 | |
1640 } | |
1641 | |
1642 _in_marking_window = new_in_marking_window; | |
1643 _in_marking_window_im = new_in_marking_window_im; | |
1644 _free_regions_at_end_of_collection = _g1->free_regions(); | |
1645 calculate_young_list_min_length(); | |
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1646 calculate_young_list_target_length(); |
342 | 1647 |
1111 | 1648 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1649 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1650 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1651 // </NEW PREDICTION> |
1652 } | |
1653 | |
3764
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1654 #define EXT_SIZE_FORMAT "%d%s" |
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1655 #define EXT_SIZE_PARAMS(bytes) \ |
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1656 byte_size_in_proper_unit((bytes)), \ |
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1657 proper_unit_for_byte_size((bytes)) |
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1658 |
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1659 void G1CollectorPolicy::print_heap_transition() { |
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1660 if (PrintGCDetails) { |
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1661 YoungList* young_list = _g1->young_list(); |
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1662 size_t eden_bytes = young_list->eden_used_bytes(); |
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1663 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1664 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1665 size_t used = _g1->used(); |
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1666 size_t capacity = _g1->capacity(); |
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1667 |
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1668 gclog_or_tty->print_cr( |
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1669 " [Eden: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1670 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1671 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1672 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1673 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1674 EXT_SIZE_PARAMS(eden_bytes), |
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1675 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1676 EXT_SIZE_PARAMS(survivor_bytes), |
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1677 EXT_SIZE_PARAMS(used_before_gc), |
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1678 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1679 EXT_SIZE_PARAMS(used), |
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1680 EXT_SIZE_PARAMS(capacity)); |
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1681 } else if (PrintGC) { |
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1682 _g1->print_size_transition(gclog_or_tty, |
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1683 _cur_collection_pause_used_at_start_bytes, |
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1684 _g1->used(), _g1->capacity()); |
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1685 } |
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1686 } |
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1687 |
342 | 1688 // <NEW PREDICTION> |
1689 | |
1111 | 1690 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1691 double update_rs_processed_buffers, | |
1692 double goal_ms) { | |
1693 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1694 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1695 | |
1282 | 1696 if (G1UseAdaptiveConcRefinement) { |
1111 | 1697 const int k_gy = 3, k_gr = 6; |
1698 const double inc_k = 1.1, dec_k = 0.9; | |
1699 | |
1700 int g = cg1r->green_zone(); | |
1701 if (update_rs_time > goal_ms) { | |
1702 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1703 } else { | |
1704 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1705 g = (int)MAX2(g * inc_k, g + 1.0); | |
1706 } | |
1707 } | |
1708 // Change the refinement threads params | |
1709 cg1r->set_green_zone(g); | |
1710 cg1r->set_yellow_zone(g * k_gy); | |
1711 cg1r->set_red_zone(g * k_gr); | |
1712 cg1r->reinitialize_threads(); | |
1713 | |
1714 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1715 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1716 cg1r->yellow_zone()); | |
1717 // Change the barrier params | |
1718 dcqs.set_process_completed_threshold(processing_threshold); | |
1719 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1720 } | |
1721 | |
1722 int curr_queue_size = dcqs.completed_buffers_num(); | |
1723 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1724 dcqs.set_completed_queue_padding(curr_queue_size); | |
1725 } else { | |
1726 dcqs.set_completed_queue_padding(0); | |
1727 } | |
1728 dcqs.notify_if_necessary(); | |
1729 } | |
1730 | |
342 | 1731 double |
1732 G1CollectorPolicy:: | |
1733 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1734 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1735 | |
1736 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1737 size_t young_num = g1h->young_list()->length(); |
342 | 1738 if (young_num == 0) |
1739 return 0.0; | |
1740 | |
1741 young_num += adjustment; | |
1742 size_t pending_cards = predict_pending_cards(); | |
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1743 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1744 predict_rs_length_diff(); |
1745 size_t card_num; | |
1746 if (full_young_gcs()) | |
1747 card_num = predict_young_card_num(rs_lengths); | |
1748 else | |
1749 card_num = predict_non_young_card_num(rs_lengths); | |
1750 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1751 double accum_yg_surv_rate = | |
1752 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1753 | |
1754 size_t bytes_to_copy = | |
1755 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1756 | |
1757 return | |
1758 predict_rs_update_time_ms(pending_cards) + | |
1759 predict_rs_scan_time_ms(card_num) + | |
1760 predict_object_copy_time_ms(bytes_to_copy) + | |
1761 predict_young_other_time_ms(young_num) + | |
1762 predict_constant_other_time_ms(); | |
1763 } | |
1764 | |
1765 double | |
1766 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1767 size_t rs_length = predict_rs_length_diff(); | |
1768 size_t card_num; | |
1769 if (full_young_gcs()) | |
1770 card_num = predict_young_card_num(rs_length); | |
1771 else | |
1772 card_num = predict_non_young_card_num(rs_length); | |
1773 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1774 } | |
1775 | |
1776 double | |
1777 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1778 size_t scanned_cards) { | |
1779 return | |
1780 predict_rs_update_time_ms(pending_cards) + | |
1781 predict_rs_scan_time_ms(scanned_cards) + | |
1782 predict_constant_other_time_ms(); | |
1783 } | |
1784 | |
1785 double | |
1786 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1787 bool young) { | |
1788 size_t rs_length = hr->rem_set()->occupied(); | |
1789 size_t card_num; | |
1790 if (full_young_gcs()) | |
1791 card_num = predict_young_card_num(rs_length); | |
1792 else | |
1793 card_num = predict_non_young_card_num(rs_length); | |
1794 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1795 | |
1796 double region_elapsed_time_ms = | |
1797 predict_rs_scan_time_ms(card_num) + | |
1798 predict_object_copy_time_ms(bytes_to_copy); | |
1799 | |
1800 if (young) | |
1801 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1802 else | |
1803 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1804 | |
1805 return region_elapsed_time_ms; | |
1806 } | |
1807 | |
1808 size_t | |
1809 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1810 size_t bytes_to_copy; | |
1811 if (hr->is_marked()) | |
1812 bytes_to_copy = hr->max_live_bytes(); | |
1813 else { | |
1814 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1815 "invariant" ); | |
1816 int age = hr->age_in_surv_rate_group(); | |
545 | 1817 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1818 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1819 } | |
1820 | |
1821 return bytes_to_copy; | |
1822 } | |
1823 | |
1824 void | |
1825 G1CollectorPolicy::start_recording_regions() { | |
1826 _recorded_rs_lengths = 0; | |
1827 _recorded_young_regions = 0; | |
1828 _recorded_non_young_regions = 0; | |
1829 | |
1830 #if PREDICTIONS_VERBOSE | |
1831 _recorded_marked_bytes = 0; | |
1832 _recorded_young_bytes = 0; | |
1833 _predicted_bytes_to_copy = 0; | |
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1834 _predicted_rs_lengths = 0; |
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1835 _predicted_cards_scanned = 0; |
342 | 1836 #endif // PREDICTIONS_VERBOSE |
1837 } | |
1838 | |
1839 void | |
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1840 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1841 #if PREDICTIONS_VERBOSE |
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1842 if (!young) { |
342 | 1843 _recorded_marked_bytes += hr->max_live_bytes(); |
1844 } | |
1845 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1846 #endif // PREDICTIONS_VERBOSE | |
1847 | |
1848 size_t rs_length = hr->rem_set()->occupied(); | |
1849 _recorded_rs_lengths += rs_length; | |
1850 } | |
1851 | |
1852 void | |
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1853 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1854 assert(!hr->is_young(), "should not call this"); |
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1855 ++_recorded_non_young_regions; |
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1856 record_cset_region_info(hr, false); |
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1857 } |
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1858 |
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1859 void |
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1860 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1861 _recorded_young_regions = n_regions; |
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1862 } |
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1863 |
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1864 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1865 #if PREDICTIONS_VERBOSE |
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1866 _recorded_young_bytes = bytes; |
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1867 #endif // PREDICTIONS_VERBOSE |
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1868 } |
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1869 |
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1870 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1871 _recorded_rs_lengths = rs_lengths; |
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1872 } |
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1873 |
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1874 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1875 _predicted_bytes_to_copy = bytes; |
342 | 1876 } |
1877 | |
1878 void | |
1879 G1CollectorPolicy::end_recording_regions() { | |
1394
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1880 // The _predicted_pause_time_ms field is referenced in code |
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1881 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1882 _predicted_pause_time_ms = -1.0; |
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1883 |
342 | 1884 #if PREDICTIONS_VERBOSE |
1885 _predicted_pending_cards = predict_pending_cards(); | |
1886 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1887 if (full_young_gcs()) | |
1888 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1889 else | |
1890 _predicted_cards_scanned += | |
1891 predict_non_young_card_num(_predicted_rs_lengths); | |
1892 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1893 | |
1894 _predicted_rs_update_time_ms = | |
1895 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1896 _predicted_rs_scan_time_ms = | |
1897 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1898 _predicted_object_copy_time_ms = | |
1899 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1900 _predicted_constant_other_time_ms = | |
1901 predict_constant_other_time_ms(); | |
1902 _predicted_young_other_time_ms = | |
1903 predict_young_other_time_ms(_recorded_young_regions); | |
1904 _predicted_non_young_other_time_ms = | |
1905 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1906 | |
1907 _predicted_pause_time_ms = | |
1908 _predicted_rs_update_time_ms + | |
1909 _predicted_rs_scan_time_ms + | |
1910 _predicted_object_copy_time_ms + | |
1911 _predicted_constant_other_time_ms + | |
1912 _predicted_young_other_time_ms + | |
1913 _predicted_non_young_other_time_ms; | |
1914 #endif // PREDICTIONS_VERBOSE | |
1915 } | |
1916 | |
1917 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1918 predicted_time_ms) { | |
1919 // I don't think we need to do this when in young GC mode since | |
1920 // marking will be initiated next time we hit the soft limit anyway... | |
1921 if (predicted_time_ms > _expensive_region_limit_ms) { | |
1922 if (!in_young_gc_mode()) { | |
1923 set_full_young_gcs(true); | |
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1924 // We might want to do something different here. However, |
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1925 // right now we don't support the non-generational G1 mode |
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1926 // (and in fact we are planning to remove the associated code, |
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1927 // see CR 6814390). So, let's leave it as is and this will be |
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1928 // removed some time in the future |
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1929 ShouldNotReachHere(); |
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1930 set_during_initial_mark_pause(); |
342 | 1931 } else |
1932 // no point in doing another partial one | |
1933 _should_revert_to_full_young_gcs = true; | |
1934 } | |
1935 } | |
1936 | |
1937 // </NEW PREDICTION> | |
1938 | |
1939 | |
1940 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1941 double elapsed_ms) { | |
1942 _recent_gc_times_ms->add(elapsed_ms); | |
1943 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1944 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1945 } | |
1946 | |
1947 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
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1948 if (_recent_pause_times_ms->num() == 0) { |
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1949 return (double) MaxGCPauseMillis; |
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1950 } |
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1951 return _recent_pause_times_ms->avg(); |
342 | 1952 } |
1953 | |
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1954 double G1CollectorPolicy::recent_avg_time_for_rs_scan_ms() { |
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1955 if (_recent_rs_scan_times_ms->num() == 0) { |
751 | 1956 return (double)MaxGCPauseMillis/3.0; |
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1957 } |
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1958 return _recent_rs_scan_times_ms->avg(); |
342 | 1959 } |
1960 | |
1961 int G1CollectorPolicy::number_of_recent_gcs() { | |
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1962 assert(_recent_rs_scan_times_ms->num() == |
342 | 1963 _recent_pause_times_ms->num(), "Sequence out of sync"); |
1964 assert(_recent_pause_times_ms->num() == | |
1965 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
1966 assert(_recent_CS_bytes_used_before->num() == | |
1967 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
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1968 |
342 | 1969 return _recent_pause_times_ms->num(); |
1970 } | |
1971 | |
1972 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
1973 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
1974 _recent_CS_bytes_used_before); | |
1975 } | |
1976 | |
1977 double G1CollectorPolicy::last_survival_fraction() { | |
1978 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
1979 _recent_CS_bytes_used_before); | |
1980 } | |
1981 | |
1982 double | |
1983 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
1984 TruncatedSeq* before) { | |
1985 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
1986 if (before->sum() > 0.0) { | |
1987 double recent_survival_rate = surviving->sum() / before->sum(); | |
1988 // We exempt parallel collection from this check because Alloc Buffer | |
1989 // fragmentation can produce negative collections. | |
1990 // Further, we're now always doing parallel collection. But I'm still | |
1991 // leaving this here as a placeholder for a more precise assertion later. | |
1992 // (DLD, 10/05.) | |
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1993 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 1994 _g1->evacuation_failed() || |
1995 recent_survival_rate <= 1.0, "Or bad frac"); | |
1996 return recent_survival_rate; | |
1997 } else { | |
1998 return 1.0; // Be conservative. | |
1999 } | |
2000 } | |
2001 | |
2002 double | |
2003 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2004 TruncatedSeq* before) { | |
2005 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2006 if (surviving->num() > 0 && before->last() > 0.0) { | |
2007 double last_survival_rate = surviving->last() / before->last(); | |
2008 // We exempt parallel collection from this check because Alloc Buffer | |
2009 // fragmentation can produce negative collections. | |
2010 // Further, we're now always doing parallel collection. But I'm still | |
2011 // leaving this here as a placeholder for a more precise assertion later. | |
2012 // (DLD, 10/05.) | |
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2013 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2014 last_survival_rate <= 1.0, "Or bad frac"); |
2015 return last_survival_rate; | |
2016 } else { | |
2017 return 1.0; | |
2018 } | |
2019 } | |
2020 | |
2021 static const int survival_min_obs = 5; | |
2022 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2023 static const double min_survival_rate = 0.1; | |
2024 | |
2025 double | |
2026 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2027 double latest) { | |
2028 double res = avg; | |
2029 if (number_of_recent_gcs() < survival_min_obs) { | |
2030 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2031 } | |
2032 res = MAX2(res, latest); | |
2033 res = MAX2(res, min_survival_rate); | |
2034 // In the parallel case, LAB fragmentation can produce "negative | |
2035 // collections"; so can evac failure. Cap at 1.0 | |
2036 res = MIN2(res, 1.0); | |
2037 return res; | |
2038 } | |
2039 | |
2040 size_t G1CollectorPolicy::expansion_amount() { | |
1356 | 2041 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
751 | 2042 // We will double the existing space, or take |
2043 // G1ExpandByPercentOfAvailable % of the available expansion | |
2044 // space, whichever is smaller, bounded below by a minimum | |
2045 // expansion (unless that's all that's left.) | |
342 | 2046 const size_t min_expand_bytes = 1*M; |
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2047 size_t reserved_bytes = _g1->max_capacity(); |
342 | 2048 size_t committed_bytes = _g1->capacity(); |
2049 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2050 size_t expand_bytes; | |
2051 size_t expand_bytes_via_pct = | |
751 | 2052 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2053 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2054 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2055 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
2056 if (G1PolicyVerbose > 1) { | |
2057 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
2058 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
2059 " Answer = %d.\n", | |
2060 recent_avg_pause_time_ratio(), | |
2061 byte_size_in_proper_unit(committed_bytes), | |
2062 proper_unit_for_byte_size(committed_bytes), | |
2063 byte_size_in_proper_unit(uncommitted_bytes), | |
2064 proper_unit_for_byte_size(uncommitted_bytes), | |
2065 byte_size_in_proper_unit(expand_bytes_via_pct), | |
2066 proper_unit_for_byte_size(expand_bytes_via_pct), | |
2067 byte_size_in_proper_unit(expand_bytes), | |
2068 proper_unit_for_byte_size(expand_bytes)); | |
2069 } | |
2070 return expand_bytes; | |
2071 } else { | |
2072 return 0; | |
2073 } | |
2074 } | |
2075 | |
2076 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2077 _mark_thread_startup_sec = os::elapsedTime(); | |
2078 } | |
2079 | |
2080 class CountCSClosure: public HeapRegionClosure { | |
2081 G1CollectorPolicy* _g1_policy; | |
2082 public: | |
2083 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2084 _g1_policy(g1_policy) {} | |
2085 bool doHeapRegion(HeapRegion* r) { | |
2086 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2087 return false; | |
2088 } | |
2089 }; | |
2090 | |
2091 void G1CollectorPolicy::count_CS_bytes_used() { | |
2092 CountCSClosure cs_closure(this); | |
2093 _g1->collection_set_iterate(&cs_closure); | |
2094 } | |
2095 | |
2096 void G1CollectorPolicy::print_summary (int level, | |
2097 const char* str, | |
2098 NumberSeq* seq) const { | |
2099 double sum = seq->sum(); | |
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2100 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 2101 str, sum / 1000.0, seq->avg()); |
2102 } | |
2103 | |
2104 void G1CollectorPolicy::print_summary_sd (int level, | |
2105 const char* str, | |
2106 NumberSeq* seq) const { | |
2107 print_summary(level, str, seq); | |
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2108 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 2109 seq->num(), seq->sd(), seq->maximum()); |
2110 } | |
2111 | |
2112 void G1CollectorPolicy::check_other_times(int level, | |
2113 NumberSeq* other_times_ms, | |
2114 NumberSeq* calc_other_times_ms) const { | |
2115 bool should_print = false; | |
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2116 LineBuffer buf(level + 2); |
342 | 2117 |
2118 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2119 fabs(calc_other_times_ms->sum())); | |
2120 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2121 fabs(calc_other_times_ms->sum())); | |
2122 double sum_ratio = max_sum / min_sum; | |
2123 if (sum_ratio > 1.1) { | |
2124 should_print = true; | |
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2125 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 2126 } |
2127 | |
2128 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2129 fabs(calc_other_times_ms->avg())); | |
2130 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2131 fabs(calc_other_times_ms->avg())); | |
2132 double avg_ratio = max_avg / min_avg; | |
2133 if (avg_ratio > 1.1) { | |
2134 should_print = true; | |
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2135 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 2136 } |
2137 | |
2138 if (other_times_ms->sum() < -0.01) { | |
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2139 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 2140 } |
2141 | |
2142 if (other_times_ms->avg() < -0.01) { | |
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2143 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 2144 } |
2145 | |
2146 if (calc_other_times_ms->sum() < -0.01) { | |
2147 should_print = true; | |
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2148 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 2149 } |
2150 | |
2151 if (calc_other_times_ms->avg() < -0.01) { | |
2152 should_print = true; | |
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2153 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 2154 } |
2155 | |
2156 if (should_print) | |
2157 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2158 } | |
2159 | |
2160 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2161 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2162 MainBodySummary* body_summary = summary->main_body_summary(); |
2163 if (summary->get_total_seq()->num() > 0) { | |
677 | 2164 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2165 if (body_summary != NULL) { |
2166 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2167 if (parallel) { | |
2168 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2169 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2170 print_summary(2, "Ext Root Scanning", | |
2171 body_summary->get_ext_root_scan_seq()); | |
2172 print_summary(2, "Mark Stack Scanning", | |
2173 body_summary->get_mark_stack_scan_seq()); | |
2174 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2175 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2176 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2177 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2178 { | |
2179 NumberSeq* other_parts[] = { | |
2180 body_summary->get_update_rs_seq(), | |
2181 body_summary->get_ext_root_scan_seq(), | |
2182 body_summary->get_mark_stack_scan_seq(), | |
2183 body_summary->get_scan_rs_seq(), | |
2184 body_summary->get_obj_copy_seq(), | |
2185 body_summary->get_termination_seq() | |
2186 }; | |
2187 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2188 6, other_parts); |
342 | 2189 check_other_times(2, body_summary->get_parallel_other_seq(), |
2190 &calc_other_times_ms); | |
2191 } | |
2192 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2193 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2194 } else { | |
2195 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2196 print_summary(1, "Ext Root Scanning", | |
2197 body_summary->get_ext_root_scan_seq()); | |
2198 print_summary(1, "Mark Stack Scanning", | |
2199 body_summary->get_mark_stack_scan_seq()); | |
2200 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2201 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2202 } | |
2203 } | |
2204 print_summary(1, "Other", summary->get_other_seq()); | |
2205 { | |
1779 | 2206 if (body_summary != NULL) { |
2207 NumberSeq calc_other_times_ms; | |
2208 if (parallel) { | |
2209 // parallel | |
2210 NumberSeq* other_parts[] = { | |
2211 body_summary->get_satb_drain_seq(), | |
2212 body_summary->get_parallel_seq(), | |
2213 body_summary->get_clear_ct_seq() | |
2214 }; | |
2215 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2216 3, other_parts); | |
2217 } else { | |
2218 // serial | |
2219 NumberSeq* other_parts[] = { | |
2220 body_summary->get_satb_drain_seq(), | |
2221 body_summary->get_update_rs_seq(), | |
2222 body_summary->get_ext_root_scan_seq(), | |
2223 body_summary->get_mark_stack_scan_seq(), | |
2224 body_summary->get_scan_rs_seq(), | |
2225 body_summary->get_obj_copy_seq() | |
2226 }; | |
2227 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2228 6, other_parts); | |
2229 } | |
2230 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2231 } |
2232 } | |
2233 } else { | |
2363
c93aa6caa02f
7022943: G1: improve logging to avoid interleaved numbers
brutisso
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2188
diff
changeset
|
2234 LineBuffer(1).append_and_print_cr("none"); |
342 | 2235 } |
2363
c93aa6caa02f
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2188
diff
changeset
|
2236 LineBuffer(0).append_and_print_cr(""); |
342 | 2237 } |
2238 | |
2239 void G1CollectorPolicy::print_tracing_info() const { | |
2240 if (TraceGen0Time) { | |
2241 gclog_or_tty->print_cr("ALL PAUSES"); | |
2242 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2243 gclog_or_tty->print_cr(""); | |
2244 gclog_or_tty->print_cr(""); | |
2245 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2246 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2247 gclog_or_tty->print_cr(""); | |
2248 | |
677 | 2249 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2250 print_summary(_summary); | |
342 | 2251 |
2252 gclog_or_tty->print_cr("MISC"); | |
2253 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2254 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2255 for (int i = 0; i < _aux_num; ++i) { | |
2256 if (_all_aux_times_ms[i].num() > 0) { | |
2257 char buffer[96]; | |
2258 sprintf(buffer, "Aux%d", i); | |
2259 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2260 } | |
2261 } | |
2262 | |
2263 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2264 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2265 "Tenured %8d (%6.2lf%%)", | |
2266 all_region_num, | |
2267 _region_num_young, | |
2268 (double) _region_num_young / (double) all_region_num * 100.0, | |
2269 _region_num_tenured, | |
2270 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2271 } | |
2272 if (TraceGen1Time) { | |
2273 if (_all_full_gc_times_ms->num() > 0) { | |
2274 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2275 _all_full_gc_times_ms->num(), | |
2276 _all_full_gc_times_ms->sum() / 1000.0); | |
2277 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2278 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2279 _all_full_gc_times_ms->sd(), | |
2280 _all_full_gc_times_ms->maximum()); | |
2281 } | |
2282 } | |
2283 } | |
2284 | |
2285 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2286 #ifndef PRODUCT | |
2287 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2288 // add this call for any other surv rate groups | |
2289 #endif // PRODUCT | |
2290 } | |
2291 | |
1973 | 2292 void |
2293 G1CollectorPolicy::update_region_num(bool young) { | |
2294 if (young) { | |
342 | 2295 ++_region_num_young; |
2296 } else { | |
2297 ++_region_num_tenured; | |
2298 } | |
2299 } | |
2300 | |
2301 #ifndef PRODUCT | |
2302 // for debugging, bit of a hack... | |
2303 static char* | |
2304 region_num_to_mbs(int length) { | |
2305 static char buffer[64]; | |
2306 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2307 double mbs = bytes / (double) (1024 * 1024); | |
2308 sprintf(buffer, "%7.2lfMB", mbs); | |
2309 return buffer; | |
2310 } | |
2311 #endif // PRODUCT | |
2312 | |
545 | 2313 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2314 switch (purpose) { |
2315 case GCAllocForSurvived: | |
545 | 2316 return _max_survivor_regions; |
342 | 2317 case GCAllocForTenured: |
545 | 2318 return REGIONS_UNLIMITED; |
342 | 2319 default: |
545 | 2320 ShouldNotReachHere(); |
2321 return REGIONS_UNLIMITED; | |
342 | 2322 }; |
2323 } | |
2324 | |
1991
016a3628c885
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|
2325 void G1CollectorPolicy::calculate_max_gc_locker_expansion() { |
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|
2326 size_t expansion_region_num = 0; |
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diff
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|
2327 if (GCLockerEdenExpansionPercent > 0) { |
016a3628c885
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diff
changeset
|
2328 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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diff
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|
2329 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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diff
changeset
|
2330 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
tonyp
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1973
diff
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|
2331 // less than 1.0) we'll get 1. |
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
changeset
|
2332 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
016a3628c885
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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|
2333 } else { |
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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parents:
1973
diff
changeset
|
2334 assert(expansion_region_num == 0, "sanity"); |
016a3628c885
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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|
2335 } |
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diff
changeset
|
2336 _young_list_max_length = _young_list_target_length + expansion_region_num; |
016a3628c885
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diff
changeset
|
2337 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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diff
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|
2338 } |
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diff
changeset
|
2339 |
545 | 2340 // Calculates survivor space parameters. |
2341 void G1CollectorPolicy::calculate_survivors_policy() | |
2342 { | |
2343 if (G1FixedSurvivorSpaceSize == 0) { | |
2344 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
2345 } else { | |
547
1e458753107d
6802413: G1: G1FixedSurvivorSpaceSize should be converted into regions in calculate_survivors_policy()
apetrusenko
parents:
545
diff
changeset
|
2346 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
545 | 2347 } |
2348 | |
2349 if (G1FixedTenuringThreshold) { | |
2350 _tenuring_threshold = MaxTenuringThreshold; | |
2351 } else { | |
2352 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
2353 HeapRegion::GrainWords * _max_survivor_regions); | |
2354 } | |
2355 } | |
2356 | |
342 | 2357 #ifndef PRODUCT |
2358 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2359 CollectionSetChooser* _chooser; | |
2360 public: | |
2361 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2362 _chooser(chooser) {} | |
2363 | |
2364 bool doHeapRegion(HeapRegion* r) { | |
2365 if (!r->continuesHumongous()) { | |
2366 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2367 } | |
2368 return false; | |
2369 } | |
2370 }; | |
2371 | |
2372 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2373 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2374 _g1->heap_region_iterate(&cl); | |
2375 return true; | |
2376 } | |
2377 #endif | |
2378 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2379 bool |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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diff
changeset
|
2380 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2381 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2382 if (!during_cycle) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2383 set_initiate_conc_mark_if_possible(); |
4e5661ba9d98
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tonyp
parents:
1611
diff
changeset
|
2384 return true; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2385 } else { |
4e5661ba9d98
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1611
diff
changeset
|
2386 return false; |
4e5661ba9d98
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1611
diff
changeset
|
2387 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2388 } |
4e5661ba9d98
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diff
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|
2389 |
342 | 2390 void |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
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|
2391 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2392 // We are about to decide on whether this pause will be an |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
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|
2393 // initial-mark pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
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|
2394 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2395 // First, during_initial_mark_pause() should not be already set. We |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2396 // will set it here if we have to. However, it should be cleared by |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
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|
2397 // the end of the pause (it's only set for the duration of an |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
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|
2398 // initial-mark pause). |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
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|
2399 assert(!during_initial_mark_pause(), "pre-condition"); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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|
2400 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2401 if (initiate_conc_mark_if_possible()) { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
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|
2402 // We had noticed on a previous pause that the heap occupancy has |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2403 // gone over the initiating threshold and we should start a |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2404 // concurrent marking cycle. So we might initiate one. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2405 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2406 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2407 if (!during_cycle) { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2408 // The concurrent marking thread is not "during a cycle", i.e., |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2409 // it has completed the last one. So we can go ahead and |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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|
2410 // initiate a new cycle. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2411 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2412 set_during_initial_mark_pause(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2413 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2414 // And we can now clear initiate_conc_mark_if_possible() as |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
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|
2415 // we've already acted on it. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
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|
2416 clear_initiate_conc_mark_if_possible(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2417 } else { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2418 // The concurrent marking thread is still finishing up the |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2419 // previous cycle. If we start one right now the two cycles |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
2420 // overlap. In particular, the concurrent marking thread might |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2421 // be in the process of clearing the next marking bitmap (which |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2422 // we will use for the next cycle if we start one). Starting a |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2423 // cycle now will be bad given that parts of the marking |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
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|
2424 // information might get cleared by the marking thread. And we |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
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diff
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|
2425 // cannot wait for the marking thread to finish the cycle as it |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
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|
2426 // periodically yields while clearing the next marking bitmap |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2427 // and, if it's in a yield point, it's waiting for us to |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2428 // finish. So, at this point we will not start a cycle and we'll |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2429 // let the concurrent marking thread complete the last one. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
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|
2430 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2431 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
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|
2432 } |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
2433 |
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2434 void |
342 | 2435 G1CollectorPolicy_BestRegionsFirst:: |
2436 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2437 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2438 } | |
2439 | |
2440 class KnownGarbageClosure: public HeapRegionClosure { | |
2441 CollectionSetChooser* _hrSorted; | |
2442 | |
2443 public: | |
2444 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2445 _hrSorted(hrSorted) | |
2446 {} | |
2447 | |
2448 bool doHeapRegion(HeapRegion* r) { | |
2449 // We only include humongous regions in collection | |
2450 // sets when concurrent mark shows that their contained object is | |
2451 // unreachable. | |
2452 | |
2453 // Do we have any marking information for this region? | |
2454 if (r->is_marked()) { | |
2455 // We don't include humongous regions in collection | |
2456 // sets because we collect them immediately at the end of a marking | |
2457 // cycle. We also don't include young regions because we *must* | |
2458 // include them in the next collection pause. | |
2459 if (!r->isHumongous() && !r->is_young()) { | |
2460 _hrSorted->addMarkedHeapRegion(r); | |
2461 } | |
2462 } | |
2463 return false; | |
2464 } | |
2465 }; | |
2466 | |
2467 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2468 CollectionSetChooser* _hrSorted; | |
2469 jint _marked_regions_added; | |
2470 jint _chunk_size; | |
2471 jint _cur_chunk_idx; | |
2472 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2473 int _worker; | |
2474 int _invokes; | |
2475 | |
2476 void get_new_chunk() { | |
2477 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2478 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2479 } | |
2480 void add_region(HeapRegion* r) { | |
2481 if (_cur_chunk_idx == _cur_chunk_end) { | |
2482 get_new_chunk(); | |
2483 } | |
2484 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2485 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2486 _marked_regions_added++; | |
2487 _cur_chunk_idx++; | |
2488 } | |
2489 | |
2490 public: | |
2491 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2492 jint chunk_size, | |
2493 int worker) : | |
2494 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2495 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2496 _invokes(0) | |
2497 {} | |
2498 | |
2499 bool doHeapRegion(HeapRegion* r) { | |
2500 // We only include humongous regions in collection | |
2501 // sets when concurrent mark shows that their contained object is | |
2502 // unreachable. | |
2503 _invokes++; | |
2504 | |
2505 // Do we have any marking information for this region? | |
2506 if (r->is_marked()) { | |
2507 // We don't include humongous regions in collection | |
2508 // sets because we collect them immediately at the end of a marking | |
2509 // cycle. | |
2510 // We also do not include young regions in collection sets | |
2511 if (!r->isHumongous() && !r->is_young()) { | |
2512 add_region(r); | |
2513 } | |
2514 } | |
2515 return false; | |
2516 } | |
2517 jint marked_regions_added() { return _marked_regions_added; } | |
2518 int invokes() { return _invokes; } | |
2519 }; | |
2520 | |
2521 class ParKnownGarbageTask: public AbstractGangTask { | |
2522 CollectionSetChooser* _hrSorted; | |
2523 jint _chunk_size; | |
2524 G1CollectedHeap* _g1; | |
2525 public: | |
2526 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2527 AbstractGangTask("ParKnownGarbageTask"), | |
2528 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2529 _g1(G1CollectedHeap::heap()) | |
2530 {} | |
2531 | |
2532 void work(int i) { | |
2533 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2534 // Back to zero for the claim value. | |
355 | 2535 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2536 HeapRegion::InitialClaimValue); | |
342 | 2537 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2538 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2539 if (G1PrintParCleanupStats) { | |
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2540 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2541 i, parKnownGarbageCl.invokes(), regions_added); |
2542 } | |
2543 } | |
2544 }; | |
2545 | |
2546 void | |
2547 G1CollectorPolicy_BestRegionsFirst:: | |
2548 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2549 size_t max_live_bytes) { | |
2550 double start; | |
2551 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2552 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2553 | |
2554 _collectionSetChooser->clearMarkedHeapRegions(); | |
2555 double clear_marked_end; | |
2556 if (G1PrintParCleanupStats) { | |
2557 clear_marked_end = os::elapsedTime(); | |
2558 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2559 (clear_marked_end - start)*1000.0); | |
2560 } | |
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2561 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2562 const size_t OverpartitionFactor = 4; |
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2563 const size_t MinWorkUnit = 8; |
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2564 const size_t WorkUnit = |
342 | 2565 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2566 MinWorkUnit); |
342 | 2567 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2568 WorkUnit); |
342 | 2569 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2570 (int) WorkUnit); |
342 | 2571 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2572 |
2573 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2574 "sanity check"); | |
342 | 2575 } else { |
2576 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2577 _g1->heap_region_iterate(&knownGarbagecl); | |
2578 } | |
2579 double known_garbage_end; | |
2580 if (G1PrintParCleanupStats) { | |
2581 known_garbage_end = os::elapsedTime(); | |
2582 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2583 (known_garbage_end - clear_marked_end)*1000.0); | |
2584 } | |
2585 _collectionSetChooser->sortMarkedHeapRegions(); | |
2586 double sort_end; | |
2587 if (G1PrintParCleanupStats) { | |
2588 sort_end = os::elapsedTime(); | |
2589 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2590 (sort_end - known_garbage_end)*1000.0); | |
2591 } | |
2592 | |
2593 record_concurrent_mark_cleanup_end_work2(); | |
2594 double work2_end; | |
2595 if (G1PrintParCleanupStats) { | |
2596 work2_end = os::elapsedTime(); | |
2597 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2598 (work2_end - sort_end)*1000.0); | |
2599 } | |
2600 } | |
2601 | |
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2602 // Add the heap region at the head of the non-incremental collection set |
342 | 2603 void G1CollectorPolicy:: |
2604 add_to_collection_set(HeapRegion* hr) { | |
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2605 assert(_inc_cset_build_state == Active, "Precondition"); |
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2606 assert(!hr->is_young(), "non-incremental add of young region"); |
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2607 |
342 | 2608 if (_g1->mark_in_progress()) |
2609 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2610 | |
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2611 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2612 hr->set_in_collection_set(true); |
2613 hr->set_next_in_collection_set(_collection_set); | |
2614 _collection_set = hr; | |
2615 _collection_set_size++; | |
2616 _collection_set_bytes_used_before += hr->used(); | |
526 | 2617 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2618 } |
2619 | |
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2620 // Initialize the per-collection-set information |
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2621 void G1CollectorPolicy::start_incremental_cset_building() { |
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2622 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2623 |
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2624 _inc_cset_head = NULL; |
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2625 _inc_cset_tail = NULL; |
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2626 _inc_cset_size = 0; |
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2627 _inc_cset_bytes_used_before = 0; |
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2628 |
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2629 if (in_young_gc_mode()) { |
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2630 _inc_cset_young_index = 0; |
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2631 } |
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2632 |
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2633 _inc_cset_max_finger = 0; |
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2634 _inc_cset_recorded_young_bytes = 0; |
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2635 _inc_cset_recorded_rs_lengths = 0; |
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2636 _inc_cset_predicted_elapsed_time_ms = 0; |
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2637 _inc_cset_predicted_bytes_to_copy = 0; |
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2638 _inc_cset_build_state = Active; |
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2639 } |
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2640 |
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2641 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2642 // This routine is used when: |
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2643 // * adding survivor regions to the incremental cset at the end of an |
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2644 // evacuation pause, |
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2645 // * adding the current allocation region to the incremental cset |
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2646 // when it is retired, and |
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2647 // * updating existing policy information for a region in the |
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2648 // incremental cset via young list RSet sampling. |
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2649 // Therefore this routine may be called at a safepoint by the |
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2650 // VM thread, or in-between safepoints by mutator threads (when |
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2651 // retiring the current allocation region) or a concurrent |
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2652 // refine thread (RSet sampling). |
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2653 |
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2654 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2655 size_t used_bytes = hr->used(); |
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2656 |
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2657 _inc_cset_recorded_rs_lengths += rs_length; |
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2658 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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2659 |
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2660 _inc_cset_bytes_used_before += used_bytes; |
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2661 |
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2662 // Cache the values we have added to the aggregated informtion |
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2663 // in the heap region in case we have to remove this region from |
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2664 // the incremental collection set, or it is updated by the |
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2665 // rset sampling code |
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2666 hr->set_recorded_rs_length(rs_length); |
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2667 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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2668 |
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2669 #if PREDICTIONS_VERBOSE |
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2670 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
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2671 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
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2672 |
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2673 // Record the number of bytes used in this region |
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2674 _inc_cset_recorded_young_bytes += used_bytes; |
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2675 |
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2676 // Cache the values we have added to the aggregated informtion |
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2677 // in the heap region in case we have to remove this region from |
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2678 // the incremental collection set, or it is updated by the |
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2679 // rset sampling code |
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2680 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
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2681 #endif // PREDICTIONS_VERBOSE |
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2682 } |
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2683 |
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2684 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
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|
2685 // This routine is currently only called as part of the updating of |
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2686 // existing policy information for regions in the incremental cset that |
1316cec51b4d
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|
2687 // is performed by the concurrent refine thread(s) as part of young list |
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|
2688 // RSet sampling. Therefore we should not be at a safepoint. |
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|
2689 |
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changeset
|
2690 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
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|
2691 assert(hr->is_young(), "it should be"); |
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|
2692 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2693 size_t used_bytes = hr->used(); |
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|
2694 size_t old_rs_length = hr->recorded_rs_length(); |
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|
2695 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
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|
2696 |
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|
2697 // Subtract the old recorded/predicted policy information for |
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|
2698 // the given heap region from the collection set info. |
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|
2699 _inc_cset_recorded_rs_lengths -= old_rs_length; |
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|
2700 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
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|
2701 |
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|
2702 _inc_cset_bytes_used_before -= used_bytes; |
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|
2703 |
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|
2704 // Clear the values cached in the heap region |
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|
2705 hr->set_recorded_rs_length(0); |
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|
2706 hr->set_predicted_elapsed_time_ms(0); |
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|
2707 |
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|
2708 #if PREDICTIONS_VERBOSE |
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|
2709 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
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|
2710 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
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|
2711 |
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|
2712 // Subtract the number of bytes used in this region |
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|
2713 _inc_cset_recorded_young_bytes -= used_bytes; |
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|
2714 |
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|
2715 // Clear the values cached in the heap region |
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|
2716 hr->set_predicted_bytes_to_copy(0); |
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|
2717 #endif // PREDICTIONS_VERBOSE |
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|
2718 } |
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|
2719 |
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|
2720 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
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2721 // Update the collection set information that is dependent on the new RS length |
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|
2722 assert(hr->is_young(), "Precondition"); |
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|
2723 |
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|
2724 remove_from_incremental_cset_info(hr); |
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|
2725 add_to_incremental_cset_info(hr, new_rs_length); |
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|
2726 } |
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|
2727 |
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|
2728 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
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|
2729 assert( hr->is_young(), "invariant"); |
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|
2730 assert( hr->young_index_in_cset() == -1, "invariant" ); |
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|
2731 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
2732 |
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changeset
|
2733 // We need to clear and set the cached recorded/cached collection set |
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|
2734 // information in the heap region here (before the region gets added |
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|
2735 // to the collection set). An individual heap region's cached values |
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|
2736 // are calculated, aggregated with the policy collection set info, |
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|
2737 // and cached in the heap region here (initially) and (subsequently) |
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|
2738 // by the Young List sampling code. |
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|
2739 |
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|
2740 size_t rs_length = hr->rem_set()->occupied(); |
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changeset
|
2741 add_to_incremental_cset_info(hr, rs_length); |
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|
2742 |
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|
2743 HeapWord* hr_end = hr->end(); |
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changeset
|
2744 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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|
2745 |
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diff
changeset
|
2746 assert(!hr->in_collection_set(), "invariant"); |
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|
2747 hr->set_in_collection_set(true); |
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changeset
|
2748 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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|
2749 |
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diff
changeset
|
2750 _inc_cset_size++; |
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diff
changeset
|
2751 _g1->register_region_with_in_cset_fast_test(hr); |
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parents:
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diff
changeset
|
2752 |
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diff
changeset
|
2753 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
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parents:
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diff
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|
2754 ++_inc_cset_young_index; |
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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
|
2755 } |
1316cec51b4d
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parents:
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diff
changeset
|
2756 |
1316cec51b4d
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diff
changeset
|
2757 // Add the region at the RHS of the incremental cset |
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diff
changeset
|
2758 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
1316cec51b4d
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diff
changeset
|
2759 // We should only ever be appending survivors at the end of a pause |
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diff
changeset
|
2760 assert( hr->is_survivor(), "Logic"); |
1316cec51b4d
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parents:
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diff
changeset
|
2761 |
1316cec51b4d
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diff
changeset
|
2762 // Do the 'common' stuff |
1316cec51b4d
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diff
changeset
|
2763 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2764 |
1316cec51b4d
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diff
changeset
|
2765 // Now add the region at the right hand side |
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diff
changeset
|
2766 if (_inc_cset_tail == NULL) { |
1316cec51b4d
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diff
changeset
|
2767 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
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diff
changeset
|
2768 _inc_cset_head = hr; |
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diff
changeset
|
2769 } else { |
1316cec51b4d
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diff
changeset
|
2770 _inc_cset_tail->set_next_in_collection_set(hr); |
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parents:
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diff
changeset
|
2771 } |
1316cec51b4d
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diff
changeset
|
2772 _inc_cset_tail = hr; |
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parents:
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diff
changeset
|
2773 } |
1316cec51b4d
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parents:
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diff
changeset
|
2774 |
1316cec51b4d
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diff
changeset
|
2775 // Add the region to the LHS of the incremental cset |
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parents:
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diff
changeset
|
2776 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
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diff
changeset
|
2777 // Survivors should be added to the RHS at the end of a pause |
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diff
changeset
|
2778 assert(!hr->is_survivor(), "Logic"); |
1316cec51b4d
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parents:
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diff
changeset
|
2779 |
1316cec51b4d
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diff
changeset
|
2780 // Do the 'common' stuff |
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diff
changeset
|
2781 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2782 |
1316cec51b4d
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diff
changeset
|
2783 // Add the region at the left hand side |
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parents:
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diff
changeset
|
2784 hr->set_next_in_collection_set(_inc_cset_head); |
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diff
changeset
|
2785 if (_inc_cset_head == NULL) { |
1316cec51b4d
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parents:
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diff
changeset
|
2786 assert(_inc_cset_tail == NULL, "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2787 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2788 } |
1316cec51b4d
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parents:
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diff
changeset
|
2789 _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
|
2790 } |
1316cec51b4d
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parents:
1391
diff
changeset
|
2791 |
1316cec51b4d
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parents:
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diff
changeset
|
2792 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2793 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
1316cec51b4d
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parents:
1391
diff
changeset
|
2794 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
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parents:
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diff
changeset
|
2795 |
1316cec51b4d
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parents:
1391
diff
changeset
|
2796 st->print_cr("\nCollection_set:"); |
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
|
2797 HeapRegion* csr = list_head; |
1316cec51b4d
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parents:
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diff
changeset
|
2798 while (csr != NULL) { |
1316cec51b4d
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parents:
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diff
changeset
|
2799 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
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parents:
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diff
changeset
|
2800 assert(csr->in_collection_set(), "bad CS"); |
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parents:
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diff
changeset
|
2801 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
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diff
changeset
|
2802 "age: %4d, y: %d, surv: %d", |
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diff
changeset
|
2803 csr->bottom(), csr->end(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2804 csr->top(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2805 csr->prev_top_at_mark_start(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2806 csr->next_top_at_mark_start(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2807 csr->top_at_conc_mark_count(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2808 csr->age_in_surv_rate_group_cond(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2809 csr->is_young(), |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2810 csr->is_survivor()); |
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|
2811 csr = next; |
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|
2812 } |
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|
2813 } |
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|
2814 #endif // !PRODUCT |
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|
2815 |
1707 | 2816 void |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2817 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2818 double target_pause_time_ms) { |
1394
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2819 // Set this here - in case we're not doing young collections. |
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2820 double non_young_start_time_sec = os::elapsedTime(); |
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2821 |
342 | 2822 start_recording_regions(); |
2823 | |
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
2824 guarantee(target_pause_time_ms > 0.0, |
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|
2825 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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|
2826 target_pause_time_ms)); |
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|
2827 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2828 |
2829 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2830 double predicted_pause_time_ms = base_time_ms; | |
2831 | |
1656
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|
2832 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2833 |
2834 // the 10% and 50% values are arbitrary... | |
1656
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changeset
|
2835 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
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|
2836 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2837 _within_target = false; |
2838 } else { | |
2839 _within_target = true; | |
2840 } | |
2841 | |
2842 // We figure out the number of bytes available for future to-space. | |
2843 // For new regions without marking information, we must assume the | |
2844 // worst-case of complete survival. If we have marking information for a | |
2845 // region, we can bound the amount of live data. We can add a number of | |
2846 // such regions, as long as the sum of the live data bounds does not | |
2847 // exceed the available evacuation space. | |
2848 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
2849 | |
2850 size_t expansion_bytes = | |
2851 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
2852 | |
677 | 2853 _collection_set_bytes_used_before = 0; |
2854 _collection_set_size = 0; | |
342 | 2855 |
2856 // Adjust for expansion and slop. | |
2857 max_live_bytes = max_live_bytes + expansion_bytes; | |
2858 | |
2859 HeapRegion* hr; | |
2860 if (in_young_gc_mode()) { | |
2861 double young_start_time_sec = os::elapsedTime(); | |
2862 | |
2863 if (G1PolicyVerbose > 0) { | |
2864 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
1394
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|
2865 _g1->young_list()->length()); |
342 | 2866 } |
1394
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|
2867 |
342 | 2868 _young_cset_length = 0; |
2869 _last_young_gc_full = full_young_gcs() ? true : false; | |
1394
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|
2870 |
342 | 2871 if (_last_young_gc_full) |
2872 ++_full_young_pause_num; | |
2873 else | |
2874 ++_partial_young_pause_num; | |
1394
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|
2875 |
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|
2876 // The young list is laid with the survivor regions from the previous |
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|
2877 // pause are appended to the RHS of the young list, i.e. |
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|
2878 // [Newly Young Regions ++ Survivors from last pause]. |
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|
2879 |
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changeset
|
2880 hr = _g1->young_list()->first_survivor_region(); |
342 | 2881 while (hr != NULL) { |
1394
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|
2882 assert(hr->is_survivor(), "badly formed young list"); |
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|
2883 hr->set_young(); |
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diff
changeset
|
2884 hr = hr->get_next_young_region(); |
342 | 2885 } |
2886 | |
1394
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
|
2887 // Clear the fields that point to the survivor list - they are |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2888 // all young now. |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2889 _g1->young_list()->clear_survivors(); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2890 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2891 if (_g1->mark_in_progress()) |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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changeset
|
2892 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
1316cec51b4d
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johnc
parents:
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diff
changeset
|
2893 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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diff
changeset
|
2894 _young_cset_length = _inc_cset_young_index; |
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
|
2895 _collection_set = _inc_cset_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2896 _collection_set_size = _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
|
2897 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2898 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2899 // For young regions in the collection set, we assume the worst |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2900 // case of complete survival |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2901 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2902 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2903 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2904 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2905 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2906 // The number of recorded young regions is the incremental |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2907 // collection set's current size |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2908 set_recorded_young_regions(_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
|
2909 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2910 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2911 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2912 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2913 #endif // PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2914 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2915 if (G1PolicyVerbose > 0) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2916 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2917 _inc_cset_size); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2918 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
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
|
2919 max_live_bytes/K); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2920 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2921 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2922 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
342 | 2923 |
2924 double young_end_time_sec = os::elapsedTime(); | |
2925 _recorded_young_cset_choice_time_ms = | |
2926 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
2927 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2928 // We are doing young collections so reset this. |
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
|
2929 non_young_start_time_sec = young_end_time_sec; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2930 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2931 // Note we can use either _collection_set_size or |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2932 // _young_cset_length here |
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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
|
2933 if (_collection_set_size > 0 && _last_young_gc_full) { |
342 | 2934 // don't bother adding more regions... |
2935 goto choose_collection_set_end; | |
2936 } | |
2937 } | |
2938 | |
2939 if (!in_young_gc_mode() || !full_young_gcs()) { | |
2940 bool should_continue = true; | |
2941 NumberSeq seq; | |
2942 double avg_prediction = 100000000000000000.0; // something very large | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
2943 |
342 | 2944 do { |
2945 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
2946 avg_prediction); | |
677 | 2947 if (hr != NULL) { |
342 | 2948 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2949 time_remaining_ms -= predicted_time_ms; | |
2950 predicted_pause_time_ms += predicted_time_ms; | |
2951 add_to_collection_set(hr); | |
1394
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
|
2952 record_non_young_cset_region(hr); |
342 | 2953 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
2954 if (G1PolicyVerbose > 0) { | |
2955 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
2956 max_live_bytes/K); | |
2957 } | |
2958 seq.add(predicted_time_ms); | |
2959 avg_prediction = seq.avg() + seq.sd(); | |
2960 } | |
2961 should_continue = | |
2962 ( hr != NULL) && | |
2963 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
2964 : _collection_set_size < _young_list_fixed_length ); | |
2965 } while (should_continue); | |
2966 | |
2967 if (!adaptive_young_list_length() && | |
2968 _collection_set_size < _young_list_fixed_length) | |
2969 _should_revert_to_full_young_gcs = true; | |
2970 } | |
2971 | |
2972 choose_collection_set_end: | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
2973 stop_incremental_cset_building(); |
1316cec51b4d
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diff
changeset
|
2974 |
342 | 2975 count_CS_bytes_used(); |
2976 | |
2977 end_recording_regions(); | |
2978 | |
2979 double non_young_end_time_sec = os::elapsedTime(); | |
2980 _recorded_non_young_cset_choice_time_ms = | |
2981 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2982 } | |
2983 | |
2984 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
2985 G1CollectorPolicy::record_full_collection_end(); | |
2986 _collectionSetChooser->updateAfterFullCollection(); | |
2987 } | |
2988 | |
2989 void G1CollectorPolicy_BestRegionsFirst:: | |
2990 expand_if_possible(size_t numRegions) { | |
2991 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
2992 _g1->expand(expansion_bytes); | |
2993 } | |
2994 | |
2995 void G1CollectorPolicy_BestRegionsFirst:: | |
1707 | 2996 record_collection_pause_end() { |
2997 G1CollectorPolicy::record_collection_pause_end(); | |
342 | 2998 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
2999 } |