Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 10100:9aa8d8037ee3
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author | mgerdin |
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date | Tue, 16 Apr 2013 12:46:24 +0200 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
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33 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 34 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
35 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
36 #include "runtime/arguments.hpp" | |
37 #include "runtime/java.hpp" | |
38 #include "runtime/mutexLocker.hpp" | |
39 #include "utilities/debug.hpp" | |
342 | 40 |
41 // Different defaults for different number of GC threads | |
42 // They were chosen by running GCOld and SPECjbb on debris with different | |
43 // numbers of GC threads and choosing them based on the results | |
44 | |
45 // all the same | |
46 static double rs_length_diff_defaults[] = { | |
47 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
48 }; | |
49 | |
50 static double cost_per_card_ms_defaults[] = { | |
51 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
52 }; | |
53 | |
54 // all the same | |
4710 | 55 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 56 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
57 }; | |
58 | |
59 static double cost_per_entry_ms_defaults[] = { | |
60 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
61 }; | |
62 | |
63 static double cost_per_byte_ms_defaults[] = { | |
64 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
65 }; | |
66 | |
67 // these should be pretty consistent | |
68 static double constant_other_time_ms_defaults[] = { | |
69 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
70 }; | |
71 | |
72 | |
73 static double young_other_cost_per_region_ms_defaults[] = { | |
74 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
75 }; | |
76 | |
77 static double non_young_other_cost_per_region_ms_defaults[] = { | |
78 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
79 }; | |
80 | |
81 G1CollectorPolicy::G1CollectorPolicy() : | |
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82 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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83 ? ParallelGCThreads : 1), |
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84 |
342 | 85 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
86 _stop_world_start(0.0), | |
87 | |
88 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
89 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
90 | |
91 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
92 _prev_collection_pause_end_ms(0.0), | |
93 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
94 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 95 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
96 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 97 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 98 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 99 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
100 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
101 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
102 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
103 _non_young_other_cost_per_region_ms_seq( | |
104 new TruncatedSeq(TruncatedSeqLength)), | |
105 | |
106 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
107 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
108 | |
751 | 109 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 110 |
4710 | 111 _gcs_are_young(true), |
342 | 112 |
113 _during_marking(false), | |
114 _in_marking_window(false), | |
115 _in_marking_window_im(false), | |
116 | |
4710 | 117 _recent_prev_end_times_for_all_gcs_sec( |
118 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 119 |
120 _recent_avg_pause_time_ratio(0.0), | |
121 | |
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122 _initiate_conc_mark_if_possible(false), |
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123 _during_initial_mark_pause(false), |
4710 | 124 _last_young_gc(false), |
125 _last_gc_was_young(false), | |
342 | 126 |
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127 _eden_bytes_before_gc(0), |
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128 _survivor_bytes_before_gc(0), |
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129 _capacity_before_gc(0), |
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130 |
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131 _eden_cset_region_length(0), |
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132 _survivor_cset_region_length(0), |
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133 _old_cset_region_length(0), |
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134 |
342 | 135 _collection_set(NULL), |
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136 _collection_set_bytes_used_before(0), |
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137 |
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138 // Incremental CSet attributes |
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139 _inc_cset_build_state(Inactive), |
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140 _inc_cset_head(NULL), |
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141 _inc_cset_tail(NULL), |
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142 _inc_cset_bytes_used_before(0), |
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143 _inc_cset_max_finger(NULL), |
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144 _inc_cset_recorded_rs_lengths(0), |
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145 _inc_cset_recorded_rs_lengths_diffs(0), |
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146 _inc_cset_predicted_elapsed_time_ms(0.0), |
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147 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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148 |
342 | 149 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
150 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
151 #endif // _MSC_VER | |
152 | |
153 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
154 G1YoungSurvRateNumRegionsSummary)), | |
155 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 156 G1YoungSurvRateNumRegionsSummary)), |
342 | 157 // add here any more surv rate groups |
545 | 158 _recorded_survivor_regions(0), |
159 _recorded_survivor_head(NULL), | |
160 _recorded_survivor_tail(NULL), | |
1356 | 161 _survivors_age_table(true), |
162 | |
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163 _gc_overhead_perc(0.0) { |
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164 |
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165 // Set up the region size and associated fields. Given that the |
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166 // policy is created before the heap, we have to set this up here, |
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167 // so it's done as soon as possible. |
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168 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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169 HeapRegionRemSet::setup_remset_size(); |
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170 |
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171 G1ErgoVerbose::initialize(); |
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172 if (PrintAdaptiveSizePolicy) { |
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173 // Currently, we only use a single switch for all the heuristics. |
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174 G1ErgoVerbose::set_enabled(true); |
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175 // Given that we don't currently have a verboseness level |
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176 // parameter, we'll hardcode this to high. This can be easily |
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177 // changed in the future. |
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178 G1ErgoVerbose::set_level(ErgoHigh); |
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179 } else { |
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180 G1ErgoVerbose::set_enabled(false); |
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181 } |
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182 |
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183 // Verify PLAB sizes |
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184 const size_t region_size = HeapRegion::GrainWords; |
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185 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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186 char buffer[128]; |
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187 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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188 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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189 vm_exit_during_initialization(buffer); |
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190 } |
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191 |
342 | 192 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
193 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
194 | |
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195 _phase_times = new G1GCPhaseTimes(_parallel_gc_threads); |
342 | 196 |
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197 int index = MIN2(_parallel_gc_threads - 1, 7); |
342 | 198 |
199 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
200 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 201 _young_cards_per_entry_ratio_seq->add( |
202 young_cards_per_entry_ratio_defaults[index]); | |
342 | 203 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
204 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
205 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
206 _young_other_cost_per_region_ms_seq->add( | |
207 young_other_cost_per_region_ms_defaults[index]); | |
208 _non_young_other_cost_per_region_ms_seq->add( | |
209 non_young_other_cost_per_region_ms_defaults[index]); | |
210 | |
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211 // Below, we might need to calculate the pause time target based on |
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212 // the pause interval. When we do so we are going to give G1 maximum |
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213 // flexibility and allow it to do pauses when it needs to. So, we'll |
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214 // arrange that the pause interval to be pause time target + 1 to |
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215 // ensure that a) the pause time target is maximized with respect to |
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216 // the pause interval and b) we maintain the invariant that pause |
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217 // time target < pause interval. If the user does not want this |
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218 // maximum flexibility, they will have to set the pause interval |
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219 // explicitly. |
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220 |
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221 // First make sure that, if either parameter is set, its value is |
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222 // reasonable. |
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223 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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224 if (MaxGCPauseMillis < 1) { |
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225 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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226 "greater than 0"); |
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227 } |
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228 } |
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229 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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230 if (GCPauseIntervalMillis < 1) { |
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231 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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232 "greater than 0"); |
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233 } |
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234 } |
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235 |
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236 // Then, if the pause time target parameter was not set, set it to |
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237 // the default value. |
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238 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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239 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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240 // The default pause time target in G1 is 200ms |
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241 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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242 } else { |
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243 // We do not allow the pause interval to be set without the |
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244 // pause time target |
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245 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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246 "without setting MaxGCPauseMillis"); |
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247 } |
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248 } |
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249 |
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250 // Then, if the interval parameter was not set, set it according to |
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251 // the pause time target (this will also deal with the case when the |
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252 // pause time target is the default value). |
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253 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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254 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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255 } |
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256 |
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257 // Finally, make sure that the two parameters are consistent. |
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258 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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259 char buffer[256]; |
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260 jio_snprintf(buffer, 256, |
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261 "MaxGCPauseMillis (%u) should be less than " |
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262 "GCPauseIntervalMillis (%u)", |
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263 MaxGCPauseMillis, GCPauseIntervalMillis); |
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264 vm_exit_during_initialization(buffer); |
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265 } |
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266 |
751 | 267 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
1610
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268 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 269 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
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270 |
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271 uintx confidence_perc = G1ConfidencePercent; |
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272 // Put an artificial ceiling on this so that it's not set to a silly value. |
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273 if (confidence_perc > 100) { |
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274 confidence_perc = 100; |
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275 warning("G1ConfidencePercent is set to a value that is too large, " |
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276 "it's been updated to %u", confidence_perc); |
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277 } |
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278 _sigma = (double) confidence_perc / 100.0; |
342 | 279 |
280 // start conservatively (around 50ms is about right) | |
281 _concurrent_mark_remark_times_ms->add(0.05); | |
282 _concurrent_mark_cleanup_times_ms->add(0.20); | |
283 _tenuring_threshold = MaxTenuringThreshold; | |
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284 // _max_survivor_regions will be calculated by |
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285 // update_young_list_target_length() during initialization. |
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286 _max_survivor_regions = 0; |
545 | 287 |
1356 | 288 assert(GCTimeRatio > 0, |
289 "we should have set it to a default value set_g1_gc_flags() " | |
290 "if a user set it to 0"); | |
291 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
292 | |
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293 uintx reserve_perc = G1ReservePercent; |
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294 // Put an artificial ceiling on this so that it's not set to a silly value. |
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295 if (reserve_perc > 50) { |
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296 reserve_perc = 50; |
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297 warning("G1ReservePercent is set to a value that is too large, " |
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298 "it's been updated to %u", reserve_perc); |
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299 } |
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300 _reserve_factor = (double) reserve_perc / 100.0; |
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301 // This will be set when the heap is expanded |
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302 // for the first time during initialization. |
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303 _reserve_regions = 0; |
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304 |
342 | 305 initialize_all(); |
4013 | 306 _collectionSetChooser = new CollectionSetChooser(); |
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307 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 308 } |
309 | |
310 void G1CollectorPolicy::initialize_flags() { | |
311 set_min_alignment(HeapRegion::GrainBytes); | |
312 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
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313 if (SurvivorRatio < 1) { |
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314 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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315 } |
342 | 316 CollectorPolicy::initialize_flags(); |
317 } | |
318 | |
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319 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
7449 | 320 assert(G1NewSizePercent <= G1MaxNewSizePercent, "Min larger than max"); |
321 assert(G1NewSizePercent > 0 && G1NewSizePercent < 100, "Min out of bounds"); | |
322 assert(G1MaxNewSizePercent > 0 && G1MaxNewSizePercent < 100, "Max out of bounds"); | |
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323 |
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324 if (FLAG_IS_CMDLINE(NewRatio)) { |
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325 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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326 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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327 } else { |
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328 _sizer_kind = SizerNewRatio; |
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329 _adaptive_size = false; |
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330 return; |
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331 } |
3976 | 332 } |
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333 |
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334 if (FLAG_IS_CMDLINE(NewSize)) { |
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335 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), |
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336 1U); |
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337 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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338 _max_desired_young_length = |
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339 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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340 1U); |
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341 _sizer_kind = SizerMaxAndNewSize; |
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342 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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343 } else { |
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344 _sizer_kind = SizerNewSizeOnly; |
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345 } |
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346 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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347 _max_desired_young_length = |
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348 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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349 1U); |
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350 _sizer_kind = SizerMaxNewSizeOnly; |
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351 } |
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352 } |
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353 |
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354 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { |
7449 | 355 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100; |
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356 return MAX2(1U, default_value); |
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357 } |
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358 |
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359 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { |
7449 | 360 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100; |
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361 return MAX2(1U, default_value); |
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362 } |
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363 |
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364 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { |
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365 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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366 |
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367 switch (_sizer_kind) { |
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368 case SizerDefaults: |
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369 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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370 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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371 break; |
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372 case SizerNewSizeOnly: |
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373 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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374 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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375 break; |
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376 case SizerMaxNewSizeOnly: |
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377 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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378 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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379 break; |
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380 case SizerMaxAndNewSize: |
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381 // Do nothing. Values set on the command line, don't update them at runtime. |
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382 break; |
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383 case SizerNewRatio: |
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384 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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385 _max_desired_young_length = _min_desired_young_length; |
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386 break; |
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387 default: |
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388 ShouldNotReachHere(); |
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389 } |
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390 |
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391 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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392 } |
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393 |
342 | 394 void G1CollectorPolicy::init() { |
395 // Set aside an initial future to_space. | |
396 _g1 = G1CollectedHeap::heap(); | |
397 | |
398 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
399 | |
545 | 400 initialize_gc_policy_counters(); |
401 | |
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402 if (adaptive_young_list_length()) { |
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403 _young_list_fixed_length = 0; |
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404 } else { |
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405 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 406 } |
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407 _free_regions_at_end_of_collection = _g1->free_regions(); |
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408 update_young_list_target_length(); |
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409 |
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410 // We may immediately start allocating regions and placing them on the |
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411 // collection set list. Initialize the per-collection set info |
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412 start_incremental_cset_building(); |
342 | 413 } |
414 | |
545 | 415 // Create the jstat counters for the policy. |
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416 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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417 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 418 } |
419 | |
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420 bool G1CollectorPolicy::predict_will_fit(uint young_length, |
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421 double base_time_ms, |
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422 uint base_free_regions, |
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423 double target_pause_time_ms) { |
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424 if (young_length >= base_free_regions) { |
342 | 425 // end condition 1: not enough space for the young regions |
426 return false; | |
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427 } |
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428 |
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429 double accum_surv_rate = accum_yg_surv_rate_pred((int) young_length - 1); |
342 | 430 size_t bytes_to_copy = |
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431 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 432 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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433 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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434 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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435 if (pause_time_ms > target_pause_time_ms) { |
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436 // end condition 2: prediction is over the target pause time |
342 | 437 return false; |
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438 } |
342 | 439 |
440 size_t free_bytes = | |
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441 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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442 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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443 // end condition 3: out-of-space (conservatively!) |
342 | 444 return false; |
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445 } |
342 | 446 |
447 // success! | |
448 return true; | |
449 } | |
450 | |
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451 void G1CollectorPolicy::record_new_heap_size(uint new_number_of_regions) { |
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452 // re-calculate the necessary reserve |
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453 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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454 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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455 // smaller than 1.0) we'll get 1. |
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456 _reserve_regions = (uint) ceil(reserve_regions_d); |
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457 |
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458 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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459 } |
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460 |
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461 uint G1CollectorPolicy::calculate_young_list_desired_min_length( |
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462 uint base_min_length) { |
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463 uint desired_min_length = 0; |
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464 if (adaptive_young_list_length()) { |
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465 if (_alloc_rate_ms_seq->num() > 3) { |
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466 double now_sec = os::elapsedTime(); |
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467 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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468 double alloc_rate_ms = predict_alloc_rate_ms(); |
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469 desired_min_length = (uint) ceil(alloc_rate_ms * when_ms); |
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470 } else { |
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471 // otherwise we don't have enough info to make the prediction |
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472 } |
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473 } |
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474 desired_min_length += base_min_length; |
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475 // make sure we don't go below any user-defined minimum bound |
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476 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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477 } |
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478 |
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479 uint G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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480 // Here, we might want to also take into account any additional |
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481 // constraints (i.e., user-defined minimum bound). Currently, we |
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482 // effectively don't set this bound. |
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483 return _young_gen_sizer->max_desired_young_length(); |
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484 } |
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485 |
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486 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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487 if (rs_lengths == (size_t) -1) { |
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488 // if it's set to the default value (-1), we should predict it; |
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489 // otherwise, use the given value. |
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490 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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491 } |
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492 |
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493 // Calculate the absolute and desired min bounds. |
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494 |
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495 // This is how many young regions we already have (currently: the survivors). |
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496 uint base_min_length = recorded_survivor_regions(); |
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497 // This is the absolute minimum young length, which ensures that we |
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498 // can allocate one eden region in the worst-case. |
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499 uint absolute_min_length = base_min_length + 1; |
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500 uint desired_min_length = |
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501 calculate_young_list_desired_min_length(base_min_length); |
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502 if (desired_min_length < absolute_min_length) { |
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503 desired_min_length = absolute_min_length; |
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504 } |
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505 |
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506 // Calculate the absolute and desired max bounds. |
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507 |
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508 // We will try our best not to "eat" into the reserve. |
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509 uint absolute_max_length = 0; |
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510 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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511 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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512 } |
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513 uint desired_max_length = calculate_young_list_desired_max_length(); |
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514 if (desired_max_length > absolute_max_length) { |
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515 desired_max_length = absolute_max_length; |
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516 } |
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517 |
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518 uint young_list_target_length = 0; |
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519 if (adaptive_young_list_length()) { |
4710 | 520 if (gcs_are_young()) { |
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521 young_list_target_length = |
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522 calculate_young_list_target_length(rs_lengths, |
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523 base_min_length, |
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524 desired_min_length, |
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525 desired_max_length); |
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526 _rs_lengths_prediction = rs_lengths; |
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527 } else { |
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528 // Don't calculate anything and let the code below bound it to |
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529 // the desired_min_length, i.e., do the next GC as soon as |
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530 // possible to maximize how many old regions we can add to it. |
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531 } |
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532 } else { |
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533 // The user asked for a fixed young gen so we'll fix the young gen |
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534 // whether the next GC is young or mixed. |
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535 young_list_target_length = _young_list_fixed_length; |
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536 } |
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537 |
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538 // Make sure we don't go over the desired max length, nor under the |
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539 // desired min length. In case they clash, desired_min_length wins |
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540 // which is why that test is second. |
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541 if (young_list_target_length > desired_max_length) { |
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542 young_list_target_length = desired_max_length; |
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543 } |
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544 if (young_list_target_length < desired_min_length) { |
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545 young_list_target_length = desired_min_length; |
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546 } |
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547 |
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548 assert(young_list_target_length > recorded_survivor_regions(), |
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549 "we should be able to allocate at least one eden region"); |
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550 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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551 _young_list_target_length = young_list_target_length; |
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552 |
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553 update_max_gc_locker_expansion(); |
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554 } |
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555 |
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556 uint |
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557 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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558 uint base_min_length, |
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559 uint desired_min_length, |
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560 uint desired_max_length) { |
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561 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 562 assert(gcs_are_young(), "only call this for young GCs"); |
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563 |
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564 // In case some edge-condition makes the desired max length too small... |
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565 if (desired_max_length <= desired_min_length) { |
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566 return desired_min_length; |
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567 } |
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568 |
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569 // We'll adjust min_young_length and max_young_length not to include |
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570 // the already allocated young regions (i.e., so they reflect the |
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571 // min and max eden regions we'll allocate). The base_min_length |
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572 // will be reflected in the predictions by the |
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573 // survivor_regions_evac_time prediction. |
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574 assert(desired_min_length > base_min_length, "invariant"); |
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575 uint min_young_length = desired_min_length - base_min_length; |
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576 assert(desired_max_length > base_min_length, "invariant"); |
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577 uint max_young_length = desired_max_length - base_min_length; |
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578 |
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579 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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580 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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581 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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582 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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583 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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584 double base_time_ms = |
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585 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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586 survivor_regions_evac_time; |
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587 uint available_free_regions = _free_regions_at_end_of_collection; |
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588 uint base_free_regions = 0; |
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589 if (available_free_regions > _reserve_regions) { |
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590 base_free_regions = available_free_regions - _reserve_regions; |
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591 } |
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592 |
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593 // Here, we will make sure that the shortest young length that |
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594 // makes sense fits within the target pause time. |
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595 |
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596 if (predict_will_fit(min_young_length, base_time_ms, |
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597 base_free_regions, target_pause_time_ms)) { |
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598 // The shortest young length will fit into the target pause time; |
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599 // we'll now check whether the absolute maximum number of young |
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600 // regions will fit in the target pause time. If not, we'll do |
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601 // a binary search between min_young_length and max_young_length. |
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602 if (predict_will_fit(max_young_length, base_time_ms, |
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603 base_free_regions, target_pause_time_ms)) { |
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604 // The maximum young length will fit into the target pause time. |
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605 // We are done so set min young length to the maximum length (as |
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606 // the result is assumed to be returned in min_young_length). |
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607 min_young_length = max_young_length; |
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608 } else { |
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609 // The maximum possible number of young regions will not fit within |
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610 // the target pause time so we'll search for the optimal |
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611 // length. The loop invariants are: |
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612 // |
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613 // min_young_length < max_young_length |
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614 // min_young_length is known to fit into the target pause time |
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615 // max_young_length is known not to fit into the target pause time |
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616 // |
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617 // Going into the loop we know the above hold as we've just |
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618 // checked them. Every time around the loop we check whether |
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619 // the middle value between min_young_length and |
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620 // max_young_length fits into the target pause time. If it |
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621 // does, it becomes the new min. If it doesn't, it becomes |
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622 // the new max. This way we maintain the loop invariants. |
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623 |
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624 assert(min_young_length < max_young_length, "invariant"); |
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625 uint diff = (max_young_length - min_young_length) / 2; |
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626 while (diff > 0) { |
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627 uint young_length = min_young_length + diff; |
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628 if (predict_will_fit(young_length, base_time_ms, |
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629 base_free_regions, target_pause_time_ms)) { |
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630 min_young_length = young_length; |
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631 } else { |
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632 max_young_length = young_length; |
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633 } |
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634 assert(min_young_length < max_young_length, "invariant"); |
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635 diff = (max_young_length - min_young_length) / 2; |
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636 } |
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637 // The results is min_young_length which, according to the |
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638 // loop invariants, should fit within the target pause time. |
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639 |
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640 // These are the post-conditions of the binary search above: |
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641 assert(min_young_length < max_young_length, |
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642 "otherwise we should have discovered that max_young_length " |
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643 "fits into the pause target and not done the binary search"); |
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644 assert(predict_will_fit(min_young_length, base_time_ms, |
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645 base_free_regions, target_pause_time_ms), |
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646 "min_young_length, the result of the binary search, should " |
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647 "fit into the pause target"); |
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648 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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649 base_free_regions, target_pause_time_ms), |
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650 "min_young_length, the result of the binary search, should be " |
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651 "optimal, so no larger length should fit into the pause target"); |
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652 } |
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653 } else { |
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654 // Even the minimum length doesn't fit into the pause time |
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655 // target, return it as the result nevertheless. |
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656 } |
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657 return base_min_length + min_young_length; |
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658 } |
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659 |
545 | 660 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
661 double survivor_regions_evac_time = 0.0; | |
662 for (HeapRegion * r = _recorded_survivor_head; | |
663 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
664 r = r->get_next_young_region()) { | |
6611 | 665 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, gcs_are_young()); |
545 | 666 } |
667 return survivor_regions_evac_time; | |
668 } | |
669 | |
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670 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 671 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
672 | |
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673 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 674 if (rs_lengths > _rs_lengths_prediction) { |
675 // add 10% to avoid having to recalculate often | |
676 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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677 update_young_list_target_length(rs_lengths_prediction); |
342 | 678 } |
679 } | |
680 | |
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681 |
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682 |
342 | 683 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
684 bool is_tlab, | |
685 bool* gc_overhead_limit_was_exceeded) { | |
686 guarantee(false, "Not using this policy feature yet."); | |
687 return NULL; | |
688 } | |
689 | |
690 // This method controls how a collector handles one or more | |
691 // of its generations being fully allocated. | |
692 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
693 bool is_tlab) { | |
694 guarantee(false, "Not using this policy feature yet."); | |
695 return NULL; | |
696 } | |
697 | |
698 | |
699 #ifndef PRODUCT | |
700 bool G1CollectorPolicy::verify_young_ages() { | |
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701 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 702 return |
703 verify_young_ages(head, _short_lived_surv_rate_group); | |
704 // also call verify_young_ages on any additional surv rate groups | |
705 } | |
706 | |
707 bool | |
708 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
709 SurvRateGroup *surv_rate_group) { | |
710 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
711 | |
712 const char* name = surv_rate_group->name(); | |
713 bool ret = true; | |
714 int prev_age = -1; | |
715 | |
716 for (HeapRegion* curr = head; | |
717 curr != NULL; | |
718 curr = curr->get_next_young_region()) { | |
719 SurvRateGroup* group = curr->surv_rate_group(); | |
720 if (group == NULL && !curr->is_survivor()) { | |
721 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
722 ret = false; | |
723 } | |
724 | |
725 if (surv_rate_group == group) { | |
726 int age = curr->age_in_surv_rate_group(); | |
727 | |
728 if (age < 0) { | |
729 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
730 ret = false; | |
731 } | |
732 | |
733 if (age <= prev_age) { | |
734 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
735 "(%d, %d)", name, age, prev_age); | |
736 ret = false; | |
737 } | |
738 prev_age = age; | |
739 } | |
740 } | |
741 | |
742 return ret; | |
743 } | |
744 #endif // PRODUCT | |
745 | |
746 void G1CollectorPolicy::record_full_collection_start() { | |
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747 _full_collection_start_sec = os::elapsedTime(); |
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748 record_heap_size_info_at_start(); |
342 | 749 // Release the future to-space so that it is available for compaction into. |
750 _g1->set_full_collection(); | |
751 } | |
752 | |
753 void G1CollectorPolicy::record_full_collection_end() { | |
754 // Consider this like a collection pause for the purposes of allocation | |
755 // since last pause. | |
756 double end_sec = os::elapsedTime(); | |
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757 double full_gc_time_sec = end_sec - _full_collection_start_sec; |
342 | 758 double full_gc_time_ms = full_gc_time_sec * 1000.0; |
759 | |
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760 _trace_gen1_time_data.record_full_collection(full_gc_time_ms); |
342 | 761 |
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762 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 763 |
764 _g1->clear_full_collection(); | |
765 | |
4710 | 766 // "Nuke" the heuristics that control the young/mixed GC |
767 // transitions and make sure we start with young GCs after the Full GC. | |
768 set_gcs_are_young(true); | |
769 _last_young_gc = false; | |
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770 clear_initiate_conc_mark_if_possible(); |
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771 clear_during_initial_mark_pause(); |
342 | 772 _in_marking_window = false; |
773 _in_marking_window_im = false; | |
774 | |
775 _short_lived_surv_rate_group->start_adding_regions(); | |
776 // also call this on any additional surv rate groups | |
777 | |
545 | 778 record_survivor_regions(0, NULL, NULL); |
779 | |
342 | 780 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 781 // Reset survivors SurvRateGroup. |
782 _survivor_surv_rate_group->reset(); | |
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783 update_young_list_target_length(); |
6011 | 784 _collectionSetChooser->clear(); |
1973 | 785 } |
342 | 786 |
787 void G1CollectorPolicy::record_stop_world_start() { | |
788 _stop_world_start = os::elapsedTime(); | |
789 } | |
790 | |
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791 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec) { |
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792 // We only need to do this here as the policy will only be applied |
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793 // to the GC we're about to start. so, no point is calculating this |
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794 // every time we calculate / recalculate the target young length. |
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795 update_survivors_policy(); |
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796 |
1973 | 797 assert(_g1->used() == _g1->recalculate_used(), |
798 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
799 _g1->used(), _g1->recalculate_used())); | |
342 | 800 |
801 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
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802 _trace_gen0_time_data.record_start_collection(s_w_t_ms); |
342 | 803 _stop_world_start = 0.0; |
804 | |
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805 record_heap_size_info_at_start(); |
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806 |
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807 phase_times()->record_cur_collection_start_sec(start_time_sec); |
342 | 808 _pending_cards = _g1->pending_card_num(); |
809 | |
6611 | 810 _collection_set_bytes_used_before = 0; |
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811 _bytes_copied_during_gc = 0; |
342 | 812 |
4710 | 813 _last_gc_was_young = false; |
342 | 814 |
815 // do that for any other surv rate groups | |
816 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 817 _survivors_age_table.clear(); |
545 | 818 |
342 | 819 assert( verify_young_ages(), "region age verification" ); |
820 } | |
821 | |
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822 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 823 mark_init_elapsed_time_ms) { |
824 _during_marking = true; | |
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825 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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826 clear_during_initial_mark_pause(); |
342 | 827 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
828 } | |
829 | |
830 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
831 _mark_remark_start_sec = os::elapsedTime(); | |
832 _during_marking = false; | |
833 } | |
834 | |
835 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
836 double end_time_sec = os::elapsedTime(); | |
837 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
838 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
839 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
840 _prev_collection_pause_end_ms += elapsed_time_ms; | |
841 | |
842 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
843 } | |
844 | |
845 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
846 _mark_cleanup_start_sec = os::elapsedTime(); | |
847 } | |
848 | |
4013 | 849 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 850 _last_young_gc = true; |
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851 _in_marking_window = false; |
342 | 852 } |
853 | |
854 void G1CollectorPolicy::record_concurrent_pause() { | |
855 if (_stop_world_start > 0.0) { | |
856 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
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857 _trace_gen0_time_data.record_yield_time(yield_ms); |
342 | 858 } |
859 } | |
860 | |
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861 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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862 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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863 return false; |
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864 } |
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865 |
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866 size_t marking_initiating_used_threshold = |
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867 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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868 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
4834
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869 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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870 |
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871 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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872 if (gcs_are_young()) { |
4834
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873 ergo_verbose5(ErgoConcCycles, |
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874 "request concurrent cycle initiation", |
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875 ergo_format_reason("occupancy higher than threshold") |
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876 ergo_format_byte("occupancy") |
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877 ergo_format_byte("allocation request") |
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878 ergo_format_byte_perc("threshold") |
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879 ergo_format_str("source"), |
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880 cur_used_bytes, |
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881 alloc_byte_size, |
4829
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882 marking_initiating_used_threshold, |
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883 (double) InitiatingHeapOccupancyPercent, |
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884 source); |
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885 return true; |
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|
886 } else { |
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887 ergo_verbose5(ErgoConcCycles, |
4829
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888 "do not request concurrent cycle initiation", |
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889 ergo_format_reason("still doing mixed collections") |
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|
890 ergo_format_byte("occupancy") |
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|
891 ergo_format_byte("allocation request") |
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892 ergo_format_byte_perc("threshold") |
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893 ergo_format_str("source"), |
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|
894 cur_used_bytes, |
4834
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|
895 alloc_byte_size, |
4829
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896 marking_initiating_used_threshold, |
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|
897 (double) InitiatingHeapOccupancyPercent, |
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898 source); |
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|
899 } |
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|
900 } |
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|
901 |
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|
902 return false; |
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|
903 } |
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904 |
342 | 905 // Anything below that is considered to be zero |
906 #define MIN_TIMER_GRANULARITY 0.0000001 | |
907 | |
6219
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908 void G1CollectorPolicy::record_collection_pause_end(double pause_time_ms) { |
342 | 909 double end_time_sec = os::elapsedTime(); |
4090
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910 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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911 "otherwise, the subtraction below does not make sense"); |
342 | 912 size_t rs_size = |
4090
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913 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 914 size_t cur_used_bytes = _g1->used(); |
915 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
916 bool last_pause_included_initial_mark = false; | |
1707 | 917 bool update_stats = !_g1->evacuation_failed(); |
342 | 918 |
919 #ifndef PRODUCT | |
920 if (G1YoungSurvRateVerbose) { | |
921 gclog_or_tty->print_cr(""); | |
922 _short_lived_surv_rate_group->print(); | |
923 // do that for any other surv rate groups too | |
924 } | |
925 #endif // PRODUCT | |
926 | |
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927 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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928 if (last_pause_included_initial_mark) { |
3867
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929 record_concurrent_mark_init_end(0.0); |
4912
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930 } else if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
4829
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931 // Note: this might have already been set, if during the last |
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932 // pause we decided to start a cycle but at the beginning of |
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933 // this pause we decided to postpone it. That's OK. |
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934 set_initiate_conc_mark_if_possible(); |
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935 } |
3867
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936 |
6219
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937 _mmu_tracker->add_pause(end_time_sec - pause_time_ms/1000.0, |
342 | 938 end_time_sec, false); |
939 | |
940 size_t freed_bytes = | |
941 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
942 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
1316cec51b4d
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|
943 |
342 | 944 double survival_fraction = |
945 (double)surviving_bytes/ | |
946 (double)_collection_set_bytes_used_before; | |
947 | |
595
3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
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|
948 if (update_stats) { |
6219
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949 _trace_gen0_time_data.record_end_collection(pause_time_ms, phase_times()); |
342 | 950 // this is where we update the allocation rate of the application |
951 double app_time_ms = | |
6628
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952 (phase_times()->cur_collection_start_sec() * 1000.0 - _prev_collection_pause_end_ms); |
342 | 953 if (app_time_ms < MIN_TIMER_GRANULARITY) { |
954 // This usually happens due to the timer not having the required | |
955 // granularity. Some Linuxes are the usual culprits. | |
956 // We'll just set it to something (arbitrarily) small. | |
957 app_time_ms = 1.0; | |
958 } | |
4090
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959 // We maintain the invariant that all objects allocated by mutator |
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960 // threads will be allocated out of eden regions. So, we can use |
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961 // the eden region number allocated since the previous GC to |
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962 // calculate the application's allocate rate. The only exception |
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963 // to that is humongous objects that are allocated separately. But |
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964 // given that humongous object allocations do not really affect |
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965 // either the pause's duration nor when the next pause will take |
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966 // place we can safely ignore them here. |
6010
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7157073: G1: type change size_t -> uint for region counts / indexes
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967 uint regions_allocated = eden_cset_region_length(); |
342 | 968 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
969 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
970 | |
971 double interval_ms = | |
972 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
6219
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973 update_recent_gc_times(end_time_sec, pause_time_ms); |
342 | 974 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
1086
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975 if (recent_avg_pause_time_ratio() < 0.0 || |
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976 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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977 #ifndef PRODUCT |
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978 // Dump info to allow post-facto debugging |
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|
979 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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980 gclog_or_tty->print_cr("-------------------------------------------"); |
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981 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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982 _recent_gc_times_ms->dump(); |
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983 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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984 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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985 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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986 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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|
987 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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988 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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989 #endif // !PRODUCT |
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990 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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991 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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992 if (_recent_avg_pause_time_ratio < 0.0) { |
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993 _recent_avg_pause_time_ratio = 0.0; |
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994 } else { |
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995 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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996 _recent_avg_pause_time_ratio = 1.0; |
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997 } |
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|
998 } |
342 | 999 } |
1000 bool new_in_marking_window = _in_marking_window; | |
1001 bool new_in_marking_window_im = false; | |
1359
23b1b27ac76c
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|
1002 if (during_initial_mark_pause()) { |
342 | 1003 new_in_marking_window = true; |
1004 new_in_marking_window_im = true; | |
1005 } | |
1006 | |
4710 | 1007 if (_last_young_gc) { |
4912
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1008 // This is supposed to to be the "last young GC" before we start |
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1009 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1010 |
3982
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1011 if (!last_pause_included_initial_mark) { |
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1012 if (next_gc_should_be_mixed("start mixed GCs", |
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1013 "do not start mixed GCs")) { |
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1014 set_gcs_are_young(false); |
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1015 } |
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1016 } else { |
4710 | 1017 ergo_verbose0(ErgoMixedGCs, |
1018 "do not start mixed GCs", | |
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1019 ergo_format_reason("concurrent cycle is about to start")); |
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1020 } |
4710 | 1021 _last_young_gc = false; |
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1022 } |
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1023 |
4710 | 1024 if (!_last_gc_was_young) { |
4912
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1025 // This is a mixed GC. Here we decide whether to continue doing |
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1026 // mixed GCs or not. |
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1027 |
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1028 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1029 "do not continue mixed GCs")) { |
4710 | 1030 set_gcs_are_young(true); |
342 | 1031 } |
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1032 } |
4710 | 1033 |
342 | 1034 _short_lived_surv_rate_group->start_adding_regions(); |
1035 // do that for any other surv rate groupsx | |
1036 | |
677 | 1037 if (update_stats) { |
342 | 1038 double cost_per_card_ms = 0.0; |
1039 if (_pending_cards > 0) { | |
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1040 cost_per_card_ms = phase_times()->average_last_update_rs_time() / (double) _pending_cards; |
342 | 1041 _cost_per_card_ms_seq->add(cost_per_card_ms); |
1042 } | |
1043 | |
1044 size_t cards_scanned = _g1->cards_scanned(); | |
1045 | |
1046 double cost_per_entry_ms = 0.0; | |
1047 if (cards_scanned > 10) { | |
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1048 cost_per_entry_ms = phase_times()->average_last_scan_rs_time() / (double) cards_scanned; |
4710 | 1049 if (_last_gc_was_young) { |
342 | 1050 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1051 } else { |
1052 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1053 } | |
342 | 1054 } |
1055 | |
1056 if (_max_rs_lengths > 0) { | |
1057 double cards_per_entry_ratio = | |
1058 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1059 if (_last_gc_was_young) { |
1060 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1061 } else { | |
1062 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1063 } | |
342 | 1064 } |
1065 | |
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1066 // This is defensive. For a while _max_rs_lengths could get |
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1067 // smaller than _recorded_rs_lengths which was causing |
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1068 // rs_length_diff to get very large and mess up the RSet length |
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1069 // predictions. The reason was unsafe concurrent updates to the |
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1070 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1071 // against (see CR 7118202). This bug has now been fixed (see CR |
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1072 // 7119027). However, I'm still worried that |
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1073 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1074 // inaccurate. The concurrent refinement thread calculates an |
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1075 // RSet's length concurrently with other CR threads updating it |
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1076 // which might cause it to calculate the length incorrectly (if, |
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1077 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1078 // conditional below just in case. |
4130
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1079 size_t rs_length_diff = 0; |
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1080 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1081 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1082 } |
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1083 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1084 |
1085 size_t copied_bytes = surviving_bytes; | |
1086 double cost_per_byte_ms = 0.0; | |
1087 if (copied_bytes > 0) { | |
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1088 cost_per_byte_ms = phase_times()->average_last_obj_copy_time() / (double) copied_bytes; |
4710 | 1089 if (_in_marking_window) { |
342 | 1090 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1091 } else { |
342 | 1092 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1093 } |
342 | 1094 } |
1095 | |
1096 double all_other_time_ms = pause_time_ms - | |
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1097 (phase_times()->average_last_update_rs_time() + phase_times()->average_last_scan_rs_time() |
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1098 + phase_times()->average_last_obj_copy_time() + phase_times()->average_last_termination_time()); |
342 | 1099 |
1100 double young_other_time_ms = 0.0; | |
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1101 if (young_cset_region_length() > 0) { |
342 | 1102 young_other_time_ms = |
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1103 phase_times()->young_cset_choice_time_ms() + |
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1104 phase_times()->young_free_cset_time_ms(); |
342 | 1105 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
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1106 (double) young_cset_region_length()); |
342 | 1107 } |
1108 double non_young_other_time_ms = 0.0; | |
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1109 if (old_cset_region_length() > 0) { |
342 | 1110 non_young_other_time_ms = |
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1111 phase_times()->non_young_cset_choice_time_ms() + |
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1112 phase_times()->non_young_free_cset_time_ms(); |
342 | 1113 |
1114 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1115 (double) old_cset_region_length()); |
342 | 1116 } |
1117 | |
1118 double constant_other_time_ms = all_other_time_ms - | |
1119 (young_other_time_ms + non_young_other_time_ms); | |
1120 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1121 | |
1122 double survival_ratio = 0.0; | |
6611 | 1123 if (_collection_set_bytes_used_before > 0) { |
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1124 survival_ratio = (double) _bytes_copied_during_gc / |
6611 | 1125 (double) _collection_set_bytes_used_before; |
342 | 1126 } |
1127 | |
1128 _pending_cards_seq->add((double) _pending_cards); | |
1129 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1130 } | |
1131 | |
1132 _in_marking_window = new_in_marking_window; | |
1133 _in_marking_window_im = new_in_marking_window_im; | |
1134 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1135 update_young_list_target_length(); |
342 | 1136 |
1111 | 1137 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1138 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
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1139 adjust_concurrent_refinement(phase_times()->average_last_update_rs_time(), |
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1140 phase_times()->sum_last_update_rs_processed_buffers(), update_rs_time_goal_ms); |
4013 | 1141 |
6011 | 1142 _collectionSetChooser->verify(); |
342 | 1143 } |
1144 | |
6059 | 1145 #define EXT_SIZE_FORMAT "%.1f%s" |
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1146 #define EXT_SIZE_PARAMS(bytes) \ |
6059 | 1147 byte_size_in_proper_unit((double)(bytes)), \ |
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1148 proper_unit_for_byte_size((bytes)) |
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1149 |
10098
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1150 void G1CollectorPolicy::record_heap_size_info_at_start() { |
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1151 YoungList* young_list = _g1->young_list(); |
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1152 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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1153 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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1154 _capacity_before_gc = _g1->capacity(); |
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1155 |
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1156 _cur_collection_pause_used_at_start_bytes = _g1->used(); |
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1157 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); |
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1158 |
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1159 size_t eden_capacity_before_gc = |
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1160 (_young_list_target_length * HeapRegion::GrainBytes) - _survivor_bytes_before_gc; |
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1161 |
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1162 _prev_eden_capacity = eden_capacity_before_gc; |
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1163 } |
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1164 |
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1165 void G1CollectorPolicy::print_heap_transition() { |
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1166 _g1->print_size_transition(gclog_or_tty, |
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1167 _cur_collection_pause_used_at_start_bytes, _g1->used(), _g1->capacity()); |
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1168 } |
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1169 |
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1170 void G1CollectorPolicy::print_detailed_heap_transition() { |
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1171 YoungList* young_list = _g1->young_list(); |
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1172 size_t eden_bytes = young_list->eden_used_bytes(); |
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1173 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1174 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1175 size_t used = _g1->used(); |
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1176 size_t capacity = _g1->capacity(); |
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1177 size_t eden_capacity = |
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1178 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1179 |
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1180 gclog_or_tty->print_cr( |
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1181 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1182 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1183 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1184 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1185 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1186 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1187 EXT_SIZE_PARAMS(eden_bytes), |
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1188 EXT_SIZE_PARAMS(eden_capacity), |
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1189 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1190 EXT_SIZE_PARAMS(survivor_bytes), |
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1191 EXT_SIZE_PARAMS(used_before_gc), |
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1192 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1193 EXT_SIZE_PARAMS(used), |
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1194 EXT_SIZE_PARAMS(capacity)); |
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1195 } |
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1196 |
1111 | 1197 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1198 double update_rs_processed_buffers, | |
1199 double goal_ms) { | |
1200 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1201 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1202 | |
1282 | 1203 if (G1UseAdaptiveConcRefinement) { |
1111 | 1204 const int k_gy = 3, k_gr = 6; |
1205 const double inc_k = 1.1, dec_k = 0.9; | |
1206 | |
1207 int g = cg1r->green_zone(); | |
1208 if (update_rs_time > goal_ms) { | |
1209 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1210 } else { | |
1211 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1212 g = (int)MAX2(g * inc_k, g + 1.0); | |
1213 } | |
1214 } | |
1215 // Change the refinement threads params | |
1216 cg1r->set_green_zone(g); | |
1217 cg1r->set_yellow_zone(g * k_gy); | |
1218 cg1r->set_red_zone(g * k_gr); | |
1219 cg1r->reinitialize_threads(); | |
1220 | |
1221 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1222 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1223 cg1r->yellow_zone()); | |
1224 // Change the barrier params | |
1225 dcqs.set_process_completed_threshold(processing_threshold); | |
1226 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1227 } | |
1228 | |
1229 int curr_queue_size = dcqs.completed_buffers_num(); | |
1230 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1231 dcqs.set_completed_queue_padding(curr_queue_size); | |
1232 } else { | |
1233 dcqs.set_completed_queue_padding(0); | |
1234 } | |
1235 dcqs.notify_if_necessary(); | |
1236 } | |
1237 | |
342 | 1238 double |
1239 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1240 size_t scanned_cards) { | |
1241 return | |
1242 predict_rs_update_time_ms(pending_cards) + | |
1243 predict_rs_scan_time_ms(scanned_cards) + | |
1244 predict_constant_other_time_ms(); | |
1245 } | |
1246 | |
1247 double | |
6611 | 1248 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { |
1249 size_t rs_length = predict_rs_length_diff(); | |
342 | 1250 size_t card_num; |
4710 | 1251 if (gcs_are_young()) { |
342 | 1252 card_num = predict_young_card_num(rs_length); |
4710 | 1253 } else { |
342 | 1254 card_num = predict_non_young_card_num(rs_length); |
4710 | 1255 } |
6611 | 1256 return predict_base_elapsed_time_ms(pending_cards, card_num); |
342 | 1257 } |
1258 | |
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1259 size_t G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
342 | 1260 size_t bytes_to_copy; |
1261 if (hr->is_marked()) | |
1262 bytes_to_copy = hr->max_live_bytes(); | |
1263 else { | |
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1264 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1265 int age = hr->age_in_surv_rate_group(); |
545 | 1266 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1267 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1268 } | |
1269 return bytes_to_copy; | |
1270 } | |
1271 | |
6611 | 1272 double |
1273 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1274 bool for_young_gc) { | |
1275 size_t rs_length = hr->rem_set()->occupied(); | |
1276 size_t card_num; | |
1277 | |
1278 // Predicting the number of cards is based on which type of GC | |
1279 // we're predicting for. | |
1280 if (for_young_gc) { | |
1281 card_num = predict_young_card_num(rs_length); | |
1282 } else { | |
1283 card_num = predict_non_young_card_num(rs_length); | |
1284 } | |
1285 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1286 | |
1287 double region_elapsed_time_ms = | |
1288 predict_rs_scan_time_ms(card_num) + | |
1289 predict_object_copy_time_ms(bytes_to_copy); | |
1290 | |
1291 // The prediction of the "other" time for this region is based | |
1292 // upon the region type and NOT the GC type. | |
1293 if (hr->is_young()) { | |
1294 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1295 } else { | |
1296 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1297 } | |
1298 return region_elapsed_time_ms; | |
1299 } | |
1300 | |
342 | 1301 void |
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1302 G1CollectorPolicy::init_cset_region_lengths(uint eden_cset_region_length, |
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1303 uint survivor_cset_region_length) { |
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1304 _eden_cset_region_length = eden_cset_region_length; |
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1305 _survivor_cset_region_length = survivor_cset_region_length; |
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1306 _old_cset_region_length = 0; |
1394
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1307 } |
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1308 |
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1309 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1310 _recorded_rs_lengths = rs_lengths; |
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1311 } |
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1312 |
342 | 1313 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1314 double elapsed_ms) { | |
1315 _recent_gc_times_ms->add(elapsed_ms); | |
1316 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1317 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1318 } | |
1319 | |
1320 size_t G1CollectorPolicy::expansion_amount() { | |
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1321 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1322 double threshold = _gc_overhead_perc; |
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1323 if (recent_gc_overhead > threshold) { |
751 | 1324 // We will double the existing space, or take |
1325 // G1ExpandByPercentOfAvailable % of the available expansion | |
1326 // space, whichever is smaller, bounded below by a minimum | |
1327 // expansion (unless that's all that's left.) | |
342 | 1328 const size_t min_expand_bytes = 1*M; |
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1329 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1330 size_t committed_bytes = _g1->capacity(); |
1331 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1332 size_t expand_bytes; | |
1333 size_t expand_bytes_via_pct = | |
751 | 1334 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1335 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1336 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1337 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1338 |
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1339 ergo_verbose5(ErgoHeapSizing, |
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1340 "attempt heap expansion", |
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1341 ergo_format_reason("recent GC overhead higher than " |
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1342 "threshold after GC") |
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1343 ergo_format_perc("recent GC overhead") |
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1344 ergo_format_perc("threshold") |
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1345 ergo_format_byte("uncommitted") |
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1346 ergo_format_byte_perc("calculated expansion amount"), |
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1347 recent_gc_overhead, threshold, |
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1348 uncommitted_bytes, |
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1349 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1350 |
342 | 1351 return expand_bytes; |
1352 } else { | |
1353 return 0; | |
1354 } | |
1355 } | |
1356 | |
1357 void G1CollectorPolicy::print_tracing_info() const { | |
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1358 _trace_gen0_time_data.print(); |
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1359 _trace_gen1_time_data.print(); |
342 | 1360 } |
1361 | |
1362 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
1363 #ifndef PRODUCT | |
1364 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
1365 // add this call for any other surv rate groups | |
1366 #endif // PRODUCT | |
1367 } | |
1368 | |
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1369 uint G1CollectorPolicy::max_regions(int purpose) { |
342 | 1370 switch (purpose) { |
1371 case GCAllocForSurvived: | |
545 | 1372 return _max_survivor_regions; |
342 | 1373 case GCAllocForTenured: |
545 | 1374 return REGIONS_UNLIMITED; |
342 | 1375 default: |
545 | 1376 ShouldNotReachHere(); |
1377 return REGIONS_UNLIMITED; | |
342 | 1378 }; |
1379 } | |
1380 | |
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1381 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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1382 uint expansion_region_num = 0; |
1991
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1383 if (GCLockerEdenExpansionPercent > 0) { |
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1384 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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1385 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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1386 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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1387 // less than 1.0) we'll get 1. |
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1388 expansion_region_num = (uint) ceil(expansion_region_num_d); |
1991
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1389 } else { |
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1390 assert(expansion_region_num == 0, "sanity"); |
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1391 } |
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1392 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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1393 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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1394 } |
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1395 |
545 | 1396 // Calculates survivor space parameters. |
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1397 void G1CollectorPolicy::update_survivors_policy() { |
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1398 double max_survivor_regions_d = |
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1399 (double) _young_list_target_length / (double) SurvivorRatio; |
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1400 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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1401 // smaller than 1.0) we'll get 1. |
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1402 _max_survivor_regions = (uint) ceil(max_survivor_regions_d); |
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1403 |
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1404 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 1405 HeapRegion::GrainWords * _max_survivor_regions); |
1406 } | |
1407 | |
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1408 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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1409 GCCause::Cause gc_cause) { |
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1410 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1411 if (!during_cycle) { |
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1412 ergo_verbose1(ErgoConcCycles, |
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1413 "request concurrent cycle initiation", |
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1414 ergo_format_reason("requested by GC cause") |
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1415 ergo_format_str("GC cause"), |
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1416 GCCause::to_string(gc_cause)); |
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1417 set_initiate_conc_mark_if_possible(); |
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1418 return true; |
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1419 } else { |
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1420 ergo_verbose1(ErgoConcCycles, |
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1421 "do not request concurrent cycle initiation", |
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1422 ergo_format_reason("concurrent cycle already in progress") |
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1423 ergo_format_str("GC cause"), |
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1424 GCCause::to_string(gc_cause)); |
1656
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1425 return false; |
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1426 } |
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1427 } |
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1428 |
342 | 1429 void |
1359
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1430 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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1431 // We are about to decide on whether this pause will be an |
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1432 // initial-mark pause. |
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1433 |
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1434 // First, during_initial_mark_pause() should not be already set. We |
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1435 // will set it here if we have to. However, it should be cleared by |
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1436 // the end of the pause (it's only set for the duration of an |
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1437 // initial-mark pause). |
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1438 assert(!during_initial_mark_pause(), "pre-condition"); |
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1439 |
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1440 if (initiate_conc_mark_if_possible()) { |
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1441 // We had noticed on a previous pause that the heap occupancy has |
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1442 // gone over the initiating threshold and we should start a |
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1443 // concurrent marking cycle. So we might initiate one. |
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1444 |
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1445 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1446 if (!during_cycle) { |
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1447 // The concurrent marking thread is not "during a cycle", i.e., |
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1448 // it has completed the last one. So we can go ahead and |
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1449 // initiate a new cycle. |
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1450 |
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1451 set_during_initial_mark_pause(); |
4710 | 1452 // We do not allow mixed GCs during marking. |
1453 if (!gcs_are_young()) { | |
1454 set_gcs_are_young(true); | |
1455 ergo_verbose0(ErgoMixedGCs, | |
1456 "end mixed GCs", | |
3982
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1457 ergo_format_reason("concurrent cycle is about to start")); |
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1458 } |
1359
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1459 |
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1460 // And we can now clear initiate_conc_mark_if_possible() as |
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1461 // we've already acted on it. |
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1462 clear_initiate_conc_mark_if_possible(); |
3914
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1463 |
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1464 ergo_verbose0(ErgoConcCycles, |
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1465 "initiate concurrent cycle", |
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1466 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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1467 } else { |
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1468 // The concurrent marking thread is still finishing up the |
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1469 // previous cycle. If we start one right now the two cycles |
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1470 // overlap. In particular, the concurrent marking thread might |
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1471 // be in the process of clearing the next marking bitmap (which |
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1472 // we will use for the next cycle if we start one). Starting a |
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1473 // cycle now will be bad given that parts of the marking |
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1474 // information might get cleared by the marking thread. And we |
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1475 // cannot wait for the marking thread to finish the cycle as it |
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1476 // periodically yields while clearing the next marking bitmap |
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1477 // and, if it's in a yield point, it's waiting for us to |
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1478 // finish. So, at this point we will not start a cycle and we'll |
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1479 // let the concurrent marking thread complete the last one. |
3914
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1480 ergo_verbose0(ErgoConcCycles, |
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1481 "do not initiate concurrent cycle", |
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1482 ergo_format_reason("concurrent cycle already in progress")); |
1359
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1483 } |
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1484 } |
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1485 } |
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1486 |
342 | 1487 class KnownGarbageClosure: public HeapRegionClosure { |
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1488 G1CollectedHeap* _g1h; |
342 | 1489 CollectionSetChooser* _hrSorted; |
1490 | |
1491 public: | |
1492 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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1493 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 1494 |
1495 bool doHeapRegion(HeapRegion* r) { | |
1496 // We only include humongous regions in collection | |
1497 // sets when concurrent mark shows that their contained object is | |
1498 // unreachable. | |
1499 | |
1500 // Do we have any marking information for this region? | |
1501 if (r->is_marked()) { | |
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1502 // We will skip any region that's currently used as an old GC |
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1503 // alloc region (we should not consider those for collection |
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1504 // before we fill them up). |
6011 | 1505 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
1506 _hrSorted->add_region(r); | |
342 | 1507 } |
1508 } | |
1509 return false; | |
1510 } | |
1511 }; | |
1512 | |
1513 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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1514 G1CollectedHeap* _g1h; |
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1515 CSetChooserParUpdater _cset_updater; |
342 | 1516 |
1517 public: | |
1518 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
6011 | 1519 uint chunk_size) : |
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1520 _g1h(G1CollectedHeap::heap()), |
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1521 _cset_updater(hrSorted, true /* parallel */, chunk_size) { } |
342 | 1522 |
1523 bool doHeapRegion(HeapRegion* r) { | |
1524 // Do we have any marking information for this region? | |
1525 if (r->is_marked()) { | |
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1526 // We will skip any region that's currently used as an old GC |
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1527 // alloc region (we should not consider those for collection |
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1528 // before we fill them up). |
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1529 if (_cset_updater.should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
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1530 _cset_updater.add_region(r); |
342 | 1531 } |
1532 } | |
1533 return false; | |
1534 } | |
1535 }; | |
1536 | |
1537 class ParKnownGarbageTask: public AbstractGangTask { | |
1538 CollectionSetChooser* _hrSorted; | |
6011 | 1539 uint _chunk_size; |
342 | 1540 G1CollectedHeap* _g1; |
1541 public: | |
6011 | 1542 ParKnownGarbageTask(CollectionSetChooser* hrSorted, uint chunk_size) : |
342 | 1543 AbstractGangTask("ParKnownGarbageTask"), |
1544 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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1545 _g1(G1CollectedHeap::heap()) { } |
342 | 1546 |
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1547 void work(uint worker_id) { |
6011 | 1548 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size); |
1549 | |
342 | 1550 // Back to zero for the claim value. |
4728
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1551 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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1552 _g1->workers()->active_workers(), |
355 | 1553 HeapRegion::InitialClaimValue); |
342 | 1554 } |
1555 }; | |
1556 | |
1557 void | |
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1558 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
6011 | 1559 _collectionSetChooser->clear(); |
4013 | 1560 |
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1561 uint region_num = _g1->n_regions(); |
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1562 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6010
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1563 const uint OverpartitionFactor = 4; |
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1564 uint WorkUnit; |
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1565 // The use of MinChunkSize = 8 in the original code |
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1566 // causes some assertion failures when the total number of |
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1567 // region is less than 8. The code here tries to fix that. |
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1568 // Should the original code also be fixed? |
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1569 if (no_of_gc_threads > 0) { |
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1570 const uint MinWorkUnit = MAX2(region_num / no_of_gc_threads, 1U); |
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1571 WorkUnit = MAX2(region_num / (no_of_gc_threads * OverpartitionFactor), |
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1572 MinWorkUnit); |
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1573 } else { |
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1574 assert(no_of_gc_threads > 0, |
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1575 "The active gc workers should be greater than 0"); |
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1576 // In a product build do something reasonable to avoid a crash. |
6010
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1577 const uint MinWorkUnit = MAX2(region_num / (uint) ParallelGCThreads, 1U); |
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1578 WorkUnit = |
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1579 MAX2(region_num / (uint) (ParallelGCThreads * OverpartitionFactor), |
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1580 MinWorkUnit); |
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1581 } |
6011 | 1582 _collectionSetChooser->prepare_for_par_region_addition(_g1->n_regions(), |
1583 WorkUnit); | |
342 | 1584 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
1571
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1585 (int) WorkUnit); |
342 | 1586 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 1587 |
1588 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
1589 "sanity check"); | |
342 | 1590 } else { |
1591 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
1592 _g1->heap_region_iterate(&knownGarbagecl); | |
1593 } | |
4013 | 1594 |
6011 | 1595 _collectionSetChooser->sort_regions(); |
1596 | |
4013 | 1597 double end_sec = os::elapsedTime(); |
1598 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; | |
1599 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1600 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1601 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1602 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 1603 } |
1604 | |
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1605 // Add the heap region at the head of the non-incremental collection set |
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1606 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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1607 assert(_inc_cset_build_state == Active, "Precondition"); |
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1608 assert(!hr->is_young(), "non-incremental add of young region"); |
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1609 |
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1610 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 1611 hr->set_in_collection_set(true); |
1612 hr->set_next_in_collection_set(_collection_set); | |
1613 _collection_set = hr; | |
1614 _collection_set_bytes_used_before += hr->used(); | |
526 | 1615 _g1->register_region_with_in_cset_fast_test(hr); |
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1616 size_t rs_length = hr->rem_set()->occupied(); |
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1617 _recorded_rs_lengths += rs_length; |
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1618 _old_cset_region_length += 1; |
342 | 1619 } |
1620 | |
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1621 // Initialize the per-collection-set information |
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1622 void G1CollectorPolicy::start_incremental_cset_building() { |
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1623 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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1624 |
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1625 _inc_cset_head = NULL; |
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1626 _inc_cset_tail = NULL; |
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1627 _inc_cset_bytes_used_before = 0; |
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1628 |
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1629 _inc_cset_max_finger = 0; |
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1630 _inc_cset_recorded_rs_lengths = 0; |
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1631 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1632 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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1633 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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1634 _inc_cset_build_state = Active; |
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1635 } |
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1636 |
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1637 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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1638 assert(_inc_cset_build_state == Active, "Precondition"); |
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1639 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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1640 |
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1641 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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1642 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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1643 // that adds a new region to the CSet. Further updates by the |
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1644 // concurrent refinement thread that samples the young RSet lengths |
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1645 // are accumulated in the *_diffs fields. Here we add the diffs to |
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1646 // the "main" fields. |
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1647 |
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1648 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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1649 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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1650 } else { |
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1651 // This is defensive. The diff should in theory be always positive |
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1652 // as RSets can only grow between GCs. However, given that we |
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1653 // sample their size concurrently with other threads updating them |
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1654 // it's possible that we might get the wrong size back, which |
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1655 // could make the calculations somewhat inaccurate. |
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1656 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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1657 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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1658 _inc_cset_recorded_rs_lengths -= diffs; |
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1659 } else { |
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1660 _inc_cset_recorded_rs_lengths = 0; |
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1661 } |
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1662 } |
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1663 _inc_cset_predicted_elapsed_time_ms += |
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1664 _inc_cset_predicted_elapsed_time_ms_diffs; |
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1665 |
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1666 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1667 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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1668 } |
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1669 |
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1670 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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1671 // This routine is used when: |
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1672 // * adding survivor regions to the incremental cset at the end of an |
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1673 // evacuation pause, |
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1674 // * adding the current allocation region to the incremental cset |
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1675 // when it is retired, and |
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1676 // * updating existing policy information for a region in the |
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1677 // incremental cset via young list RSet sampling. |
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1678 // Therefore this routine may be called at a safepoint by the |
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1679 // VM thread, or in-between safepoints by mutator threads (when |
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1680 // retiring the current allocation region) or a concurrent |
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1681 // refine thread (RSet sampling). |
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1682 |
6611 | 1683 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
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1684 size_t used_bytes = hr->used(); |
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1685 _inc_cset_recorded_rs_lengths += rs_length; |
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1686 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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1687 _inc_cset_bytes_used_before += used_bytes; |
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1688 |
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1689 // Cache the values we have added to the aggregated informtion |
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1690 // in the heap region in case we have to remove this region from |
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1691 // the incremental collection set, or it is updated by the |
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1692 // rset sampling code |
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1693 hr->set_recorded_rs_length(rs_length); |
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1694 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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1695 } |
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1696 |
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1697 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
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1698 size_t new_rs_length) { |
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1699 // Update the CSet information that is dependent on the new RS length |
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1700 assert(hr->is_young(), "Precondition"); |
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1701 assert(!SafepointSynchronize::is_at_safepoint(), |
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1702 "should not be at a safepoint"); |
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1703 |
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1704 // We could have updated _inc_cset_recorded_rs_lengths and |
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1705 // _inc_cset_predicted_elapsed_time_ms directly but we'd need to do |
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1706 // that atomically, as this code is executed by a concurrent |
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1707 // refinement thread, potentially concurrently with a mutator thread |
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1708 // allocating a new region and also updating the same fields. To |
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1709 // avoid the atomic operations we accumulate these updates on two |
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1710 // separate fields (*_diffs) and we'll just add them to the "main" |
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1711 // fields at the start of a GC. |
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1712 |
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1713 ssize_t old_rs_length = (ssize_t) hr->recorded_rs_length(); |
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1714 ssize_t rs_lengths_diff = (ssize_t) new_rs_length - old_rs_length; |
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1715 _inc_cset_recorded_rs_lengths_diffs += rs_lengths_diff; |
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1716 |
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1717 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
6611 | 1718 double new_region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
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|
1719 double elapsed_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
1720 _inc_cset_predicted_elapsed_time_ms_diffs += elapsed_ms_diff; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
1721 |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
1722 hr->set_recorded_rs_length(new_rs_length); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
1723 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
1394
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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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|
1724 } |
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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|
1725 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
1726 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
1727 assert(hr->is_young(), "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
1728 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
1729 assert(_inc_cset_build_state == Active, "Precondition"); |
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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|
1730 |
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
|
1731 // We need to clear and set the cached recorded/cached collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1732 // information in the heap region here (before the region gets added |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
1733 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1734 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1735 // and cached in the heap region here (initially) and (subsequently) |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
1736 // by the Young List sampling code. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1737 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1738 size_t rs_length = hr->rem_set()->occupied(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1739 add_to_incremental_cset_info(hr, rs_length); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1740 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
1741 HeapWord* hr_end = hr->end(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1742 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1743 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1744 assert(!hr->in_collection_set(), "invariant"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1745 hr->set_in_collection_set(true); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1746 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1747 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1748 _g1->register_region_with_in_cset_fast_test(hr); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1749 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1750 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1751 // Add the region at the RHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1752 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1753 // We should only ever be appending survivors at the end of a pause |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1754 assert( hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
1755 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1756 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1757 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
|
1758 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1759 // Now add the region at the right hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1760 if (_inc_cset_tail == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1761 assert(_inc_cset_head == NULL, "invariant"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1762 _inc_cset_head = hr; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
1763 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1764 _inc_cset_tail->set_next_in_collection_set(hr); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
1765 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1766 _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
|
1767 } |
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
|
1768 |
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
|
1769 // Add the region to the LHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1770 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1771 // Survivors should be added to the RHS at the end of a pause |
1316cec51b4d
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diff
changeset
|
1772 assert(!hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1773 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
1774 // Do the 'common' stuff |
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
|
1775 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
|
1776 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1777 // Add the region at the left hand side |
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
|
1778 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1779 if (_inc_cset_head == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
1780 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
|
1781 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
1782 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1783 _inc_cset_head = 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
|
1784 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1785 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1786 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1787 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1788 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
|
1789 |
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
|
1790 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:
1391
diff
changeset
|
1791 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1792 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
1793 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1794 assert(csr->in_collection_set(), "bad CS"); |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1795 st->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1796 HR_FORMAT_PARAMS(csr), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1797 csr->prev_top_at_mark_start(), csr->next_top_at_mark_start(), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1798 csr->age_in_surv_rate_group_cond()); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1799 csr = next; |
1316cec51b4d
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parents:
1391
diff
changeset
|
1800 } |
1316cec51b4d
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parents:
1391
diff
changeset
|
1801 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1802 #endif // !PRODUCT |
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
|
1803 |
8681
27714220e50e
8007036: G1: Too many old regions added to last mixed GC
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parents:
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diff
changeset
|
1804 double G1CollectorPolicy::reclaimable_bytes_perc(size_t reclaimable_bytes) { |
27714220e50e
8007036: G1: Too many old regions added to last mixed GC
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diff
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|
1805 // Returns the given amount of reclaimable bytes (that represents |
27714220e50e
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diff
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|
1806 // the amount of reclaimable space still to be collected) as a |
27714220e50e
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diff
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|
1807 // percentage of the current heap capacity. |
27714220e50e
8007036: G1: Too many old regions added to last mixed GC
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diff
changeset
|
1808 size_t capacity_bytes = _g1->capacity(); |
27714220e50e
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diff
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|
1809 return (double) reclaimable_bytes * 100.0 / (double) capacity_bytes; |
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8007036: G1: Too many old regions added to last mixed GC
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diff
changeset
|
1810 } |
27714220e50e
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diff
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|
1811 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1812 bool G1CollectorPolicy::next_gc_should_be_mixed(const char* true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
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|
1813 const char* false_action_str) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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diff
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|
1814 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1815 if (cset_chooser->is_empty()) { |
4912
a9647476d1a4
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diff
changeset
|
1816 ergo_verbose0(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1817 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1818 ergo_format_reason("candidate old regions not available")); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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|
1819 return false; |
a9647476d1a4
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diff
changeset
|
1820 } |
8681
27714220e50e
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diff
changeset
|
1821 |
27714220e50e
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8094
diff
changeset
|
1822 // Is the amount of uncollected reclaimable space above G1HeapWastePercent? |
6011 | 1823 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
8681
27714220e50e
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parents:
8094
diff
changeset
|
1824 double reclaimable_perc = reclaimable_bytes_perc(reclaimable_bytes); |
5964
21595f05bc93
7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs
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4912
diff
changeset
|
1825 double threshold = (double) G1HeapWastePercent; |
8681
27714220e50e
8007036: G1: Too many old regions added to last mixed GC
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8094
diff
changeset
|
1826 if (reclaimable_perc <= threshold) { |
4912
a9647476d1a4
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diff
changeset
|
1827 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1828 false_action_str, |
8681
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8007036: G1: Too many old regions added to last mixed GC
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parents:
8094
diff
changeset
|
1829 ergo_format_reason("reclaimable percentage not over threshold") |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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changeset
|
1830 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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changeset
|
1831 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
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changeset
|
1832 ergo_format_perc("threshold"), |
6011 | 1833 cset_chooser->remaining_regions(), |
8681
27714220e50e
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parents:
8094
diff
changeset
|
1834 reclaimable_bytes, |
27714220e50e
8007036: G1: Too many old regions added to last mixed GC
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parents:
8094
diff
changeset
|
1835 reclaimable_perc, threshold); |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
1836 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
1837 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
1838 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
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|
1839 ergo_verbose4(ErgoMixedGCs, |
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1840 true_action_str, |
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1841 ergo_format_reason("candidate old regions available") |
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1842 ergo_format_region("candidate old regions") |
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1843 ergo_format_byte_perc("reclaimable") |
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1844 ergo_format_perc("threshold"), |
6011 | 1845 cset_chooser->remaining_regions(), |
8681
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1846 reclaimable_bytes, |
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1847 reclaimable_perc, threshold); |
4912
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1848 return true; |
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|
1849 } |
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1850 |
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1851 uint G1CollectorPolicy::calc_min_old_cset_length() { |
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1852 // The min old CSet region bound is based on the maximum desired |
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1853 // number of mixed GCs after a cycle. I.e., even if some old regions |
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1854 // look expensive, we should add them to the CSet anyway to make |
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1855 // sure we go through the available old regions in no more than the |
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1856 // maximum desired number of mixed GCs. |
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1857 // |
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1858 // The calculation is based on the number of marked regions we added |
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1859 // to the CSet chooser in the first place, not how many remain, so |
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1860 // that the result is the same during all mixed GCs that follow a cycle. |
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1861 |
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1862 const size_t region_num = (size_t) _collectionSetChooser->length(); |
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1863 const size_t gc_num = (size_t) MAX2(G1MixedGCCountTarget, (uintx) 1); |
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1864 size_t result = region_num / gc_num; |
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1865 // emulate ceiling |
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1866 if (result * gc_num < region_num) { |
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1867 result += 1; |
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1868 } |
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1869 return (uint) result; |
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1870 } |
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1871 |
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1872 uint G1CollectorPolicy::calc_max_old_cset_length() { |
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1873 // The max old CSet region bound is based on the threshold expressed |
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1874 // as a percentage of the heap size. I.e., it should bound the |
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1875 // number of old regions added to the CSet irrespective of how many |
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1876 // of them are available. |
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1877 |
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1878 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1879 const size_t region_num = g1h->n_regions(); |
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1880 const size_t perc = (size_t) G1OldCSetRegionThresholdPercent; |
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1881 size_t result = region_num * perc / 100; |
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1882 // emulate ceiling |
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1883 if (100 * result < region_num * perc) { |
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1884 result += 1; |
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1885 } |
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1886 return (uint) result; |
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1887 } |
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1888 |
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1889 |
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1890 void G1CollectorPolicy::finalize_cset(double target_pause_time_ms) { |
6611 | 1891 double young_start_time_sec = os::elapsedTime(); |
1394
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1892 |
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1893 YoungList* young_list = _g1->young_list(); |
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1894 finalize_incremental_cset_building(); |
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1895 |
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1896 guarantee(target_pause_time_ms > 0.0, |
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1897 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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1898 target_pause_time_ms)); |
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1899 guarantee(_collection_set == NULL, "Precondition"); |
342 | 1900 |
1901 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
1902 double predicted_pause_time_ms = base_time_ms; | |
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1903 double time_remaining_ms = MAX2(target_pause_time_ms - base_time_ms, 0.0); |
342 | 1904 |
6611 | 1905 ergo_verbose4(ErgoCSetConstruction | ErgoHigh, |
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1906 "start choosing CSet", |
6611 | 1907 ergo_format_size("_pending_cards") |
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1908 ergo_format_ms("predicted base time") |
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1909 ergo_format_ms("remaining time") |
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1910 ergo_format_ms("target pause time"), |
6611 | 1911 _pending_cards, base_time_ms, time_remaining_ms, target_pause_time_ms); |
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1912 |
4710 | 1913 _last_gc_was_young = gcs_are_young() ? true : false; |
1914 | |
1915 if (_last_gc_was_young) { | |
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1916 _trace_gen0_time_data.increment_young_collection_count(); |
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1917 } else { |
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1918 _trace_gen0_time_data.increment_mixed_collection_count(); |
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1919 } |
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1920 |
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1921 // The young list is laid with the survivor regions from the previous |
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1922 // pause are appended to the RHS of the young list, i.e. |
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1923 // [Newly Young Regions ++ Survivors from last pause]. |
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1924 |
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1925 uint survivor_region_length = young_list->survivor_length(); |
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1926 uint eden_region_length = young_list->length() - survivor_region_length; |
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1927 init_cset_region_lengths(eden_region_length, survivor_region_length); |
6611 | 1928 |
1929 HeapRegion* hr = young_list->first_survivor_region(); | |
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1930 while (hr != NULL) { |
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1931 assert(hr->is_survivor(), "badly formed young list"); |
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1932 hr->set_young(); |
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1933 hr = hr->get_next_young_region(); |
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1934 } |
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1935 |
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1936 // Clear the fields that point to the survivor list - they are all young now. |
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1937 young_list->clear_survivors(); |
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1938 |
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1939 _collection_set = _inc_cset_head; |
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1940 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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1941 time_remaining_ms = MAX2(time_remaining_ms - _inc_cset_predicted_elapsed_time_ms, 0.0); |
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1942 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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1943 |
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1944 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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1945 "add young regions to CSet", |
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1946 ergo_format_region("eden") |
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1947 ergo_format_region("survivors") |
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1948 ergo_format_ms("predicted young region time"), |
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1949 eden_region_length, survivor_region_length, |
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1950 _inc_cset_predicted_elapsed_time_ms); |
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1951 |
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1952 // The number of recorded young regions is the incremental |
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1953 // collection set's current size |
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1954 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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1955 |
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1956 double young_end_time_sec = os::elapsedTime(); |
6628
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1957 phase_times()->record_young_cset_choice_time_ms((young_end_time_sec - young_start_time_sec) * 1000.0); |
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1958 |
6611 | 1959 // Set the start of the non-young choice time. |
1960 double non_young_start_time_sec = young_end_time_sec; | |
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1961 |
4710 | 1962 if (!gcs_are_young()) { |
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1963 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1964 cset_chooser->verify(); |
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1965 const uint min_old_cset_length = calc_min_old_cset_length(); |
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1966 const uint max_old_cset_length = calc_max_old_cset_length(); |
6010
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1967 |
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1968 uint expensive_region_num = 0; |
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1969 bool check_time_remaining = adaptive_young_list_length(); |
6611 | 1970 |
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1971 HeapRegion* hr = cset_chooser->peek(); |
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1972 while (hr != NULL) { |
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1973 if (old_cset_region_length() >= max_old_cset_length) { |
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|
1974 // Added maximum number of old regions to the CSet. |
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1975 ergo_verbose2(ErgoCSetConstruction, |
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1976 "finish adding old regions to CSet", |
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1977 ergo_format_reason("old CSet region num reached max") |
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1978 ergo_format_region("old") |
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1979 ergo_format_region("max"), |
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1980 old_cset_region_length(), max_old_cset_length); |
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1981 break; |
342 | 1982 } |
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1983 |
8681
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1984 |
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1985 // Stop adding regions if the remaining reclaimable space is |
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1986 // not above G1HeapWastePercent. |
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|
1987 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
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1988 double reclaimable_perc = reclaimable_bytes_perc(reclaimable_bytes); |
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1989 double threshold = (double) G1HeapWastePercent; |
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1990 if (reclaimable_perc <= threshold) { |
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1991 // We've added enough old regions that the amount of uncollected |
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1992 // reclaimable space is at or below the waste threshold. Stop |
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1993 // adding old regions to the CSet. |
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1994 ergo_verbose5(ErgoCSetConstruction, |
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1995 "finish adding old regions to CSet", |
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1996 ergo_format_reason("reclaimable percentage not over threshold") |
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1997 ergo_format_region("old") |
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1998 ergo_format_region("max") |
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1999 ergo_format_byte_perc("reclaimable") |
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2000 ergo_format_perc("threshold"), |
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2001 old_cset_region_length(), |
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2002 max_old_cset_length, |
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2003 reclaimable_bytes, |
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|
2004 reclaimable_perc, threshold); |
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parents:
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|
2005 break; |
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changeset
|
2006 } |
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|
2007 |
6611 | 2008 double predicted_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
4912
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2009 if (check_time_remaining) { |
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2010 if (predicted_time_ms > time_remaining_ms) { |
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2011 // Too expensive for the current CSet. |
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|
2012 |
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2013 if (old_cset_region_length() >= min_old_cset_length) { |
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2014 // We have added the minimum number of old regions to the CSet, |
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2015 // we are done with this CSet. |
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2016 ergo_verbose4(ErgoCSetConstruction, |
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2017 "finish adding old regions to CSet", |
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2018 ergo_format_reason("predicted time is too high") |
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|
2019 ergo_format_ms("predicted time") |
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2020 ergo_format_ms("remaining time") |
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2021 ergo_format_region("old") |
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|
2022 ergo_format_region("min"), |
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|
2023 predicted_time_ms, time_remaining_ms, |
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2024 old_cset_region_length(), min_old_cset_length); |
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|
2025 break; |
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|
2026 } |
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|
2027 |
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2028 // We'll add it anyway given that we haven't reached the |
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2029 // minimum number of old regions. |
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|
2030 expensive_region_num += 1; |
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|
2031 } |
3914
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|
2032 } else { |
4912
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2033 if (old_cset_region_length() >= min_old_cset_length) { |
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2034 // In the non-auto-tuning case, we'll finish adding regions |
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2035 // to the CSet if we reach the minimum. |
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|
2036 ergo_verbose2(ErgoCSetConstruction, |
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|
2037 "finish adding old regions to CSet", |
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|
2038 ergo_format_reason("old CSet region num reached min") |
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|
2039 ergo_format_region("old") |
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|
2040 ergo_format_region("min"), |
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2041 old_cset_region_length(), min_old_cset_length); |
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|
2042 break; |
3914
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parents:
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|
2043 } |
20213c8a3c40
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tonyp
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|
2044 } |
4912
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|
2045 |
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|
2046 // We will add this region to the CSet. |
8681
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|
2047 time_remaining_ms = MAX2(time_remaining_ms - predicted_time_ms, 0.0); |
4912
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|
2048 predicted_pause_time_ms += predicted_time_ms; |
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|
2049 cset_chooser->remove_and_move_to_next(hr); |
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|
2050 _g1->old_set_remove(hr); |
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|
2051 add_old_region_to_cset(hr); |
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|
2052 |
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|
2053 hr = cset_chooser->peek(); |
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|
2054 } |
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|
2055 if (hr == NULL) { |
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|
2056 ergo_verbose0(ErgoCSetConstruction, |
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diff
changeset
|
2057 "finish adding old regions to CSet", |
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diff
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|
2058 ergo_format_reason("candidate old regions not available")); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
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diff
changeset
|
2059 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2060 |
4912
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|
2061 if (expensive_region_num > 0) { |
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|
2062 // We print the information once here at the end, predicated on |
a9647476d1a4
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changeset
|
2063 // whether we added any apparently expensive regions or not, to |
a9647476d1a4
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diff
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|
2064 // avoid generating output per region. |
a9647476d1a4
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parents:
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changeset
|
2065 ergo_verbose4(ErgoCSetConstruction, |
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diff
changeset
|
2066 "added expensive regions to CSet", |
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parents:
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diff
changeset
|
2067 ergo_format_reason("old CSet region num not reached min") |
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diff
changeset
|
2068 ergo_format_region("old") |
a9647476d1a4
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parents:
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diff
changeset
|
2069 ergo_format_region("expensive") |
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changeset
|
2070 ergo_format_region("min") |
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changeset
|
2071 ergo_format_ms("remaining time"), |
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diff
changeset
|
2072 old_cset_region_length(), |
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parents:
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diff
changeset
|
2073 expensive_region_num, |
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diff
changeset
|
2074 min_old_cset_length, |
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diff
changeset
|
2075 time_remaining_ms); |
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changeset
|
2076 } |
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changeset
|
2077 |
6011 | 2078 cset_chooser->verify(); |
342 | 2079 } |
2080 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2081 stop_incremental_cset_building(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2082 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2083 ergo_verbose5(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2084 "finish choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2085 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2086 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2087 ergo_format_region("old") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2088 ergo_format_ms("predicted pause time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2089 ergo_format_ms("target pause time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2090 eden_region_length, survivor_region_length, |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2091 old_cset_region_length(), |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2092 predicted_pause_time_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2093 |
342 | 2094 double non_young_end_time_sec = os::elapsedTime(); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2095 phase_times()->record_non_young_cset_choice_time_ms((non_young_end_time_sec - non_young_start_time_sec) * 1000.0); |
342 | 2096 } |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2097 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2098 void TraceGen0TimeData::record_start_collection(double time_to_stop_the_world_ms) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2099 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2100 _all_stop_world_times_ms.add(time_to_stop_the_world_ms); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2101 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2102 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2103 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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2104 void TraceGen0TimeData::record_yield_time(double yield_time_ms) { |
bbc900c2482a
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|
2105 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2106 _all_yield_times_ms.add(yield_time_ms); |
bbc900c2482a
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|
2107 } |
bbc900c2482a
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brutisso
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6064
diff
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|
2108 } |
bbc900c2482a
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brutisso
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6064
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|
2109 |
6219
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7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2110 void TraceGen0TimeData::record_end_collection(double pause_time_ms, G1GCPhaseTimes* phase_times) { |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2111 if(TraceGen0Time) { |
6219
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7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2112 _total.add(pause_time_ms); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2113 _other.add(pause_time_ms - phase_times->accounted_time_ms()); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2114 _root_region_scan_wait.add(phase_times->root_region_scan_wait_time_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2115 _parallel.add(phase_times->cur_collection_par_time_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2116 _ext_root_scan.add(phase_times->average_last_ext_root_scan_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2117 _satb_filtering.add(phase_times->average_last_satb_filtering_times_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2118 _update_rs.add(phase_times->average_last_update_rs_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2119 _scan_rs.add(phase_times->average_last_scan_rs_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2120 _obj_copy.add(phase_times->average_last_obj_copy_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2121 _termination.add(phase_times->average_last_termination_time()); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
2122 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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changeset
|
2123 double parallel_known_time = phase_times->average_last_ext_root_scan_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2124 phase_times->average_last_satb_filtering_times_ms() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2125 phase_times->average_last_update_rs_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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changeset
|
2126 phase_times->average_last_scan_rs_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2127 phase_times->average_last_obj_copy_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2128 + phase_times->average_last_termination_time(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
2129 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
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changeset
|
2130 double parallel_other_time = phase_times->cur_collection_par_time_ms() - parallel_known_time; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2131 _parallel_other.add(parallel_other_time); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2132 _clear_ct.add(phase_times->cur_clear_ct_time_ms()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2133 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2134 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
diff
changeset
|
2135 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2136 void TraceGen0TimeData::increment_young_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2137 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2138 ++_young_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2139 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2140 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2141 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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changeset
|
2142 void TraceGen0TimeData::increment_mixed_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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changeset
|
2143 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2144 ++_mixed_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2145 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2146 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2147 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2148 void TraceGen0TimeData::print_summary(const char* str, |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2149 const NumberSeq* seq) const { |
bbc900c2482a
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brutisso
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|
2150 double sum = seq->sum(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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changeset
|
2151 gclog_or_tty->print_cr("%-27s = %8.2lf s (avg = %8.2lf ms)", |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2152 str, sum / 1000.0, seq->avg()); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2153 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2154 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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changeset
|
2155 void TraceGen0TimeData::print_summary_sd(const char* str, |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2156 const NumberSeq* seq) const { |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2157 print_summary(str, seq); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2158 gclog_or_tty->print_cr("%+45s = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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changeset
|
2159 "(num", seq->num(), seq->sd(), seq->maximum()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2160 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2161 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2162 void TraceGen0TimeData::print() const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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changeset
|
2163 if (!TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2164 return; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2165 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2166 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2167 gclog_or_tty->print_cr("ALL PAUSES"); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2168 print_summary_sd(" Total", &_total); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2169 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2170 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2171 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2172 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2173 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2174 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2175 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2176 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2177 if (_young_pause_num == 0 && _mixed_pause_num == 0) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2178 gclog_or_tty->print_cr("none"); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2179 } else { |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2180 print_summary_sd(" Evacuation Pauses", &_total); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2181 print_summary(" Root Region Scan Wait", &_root_region_scan_wait); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2182 print_summary(" Parallel Time", &_parallel); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2183 print_summary(" Ext Root Scanning", &_ext_root_scan); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2184 print_summary(" SATB Filtering", &_satb_filtering); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2185 print_summary(" Update RS", &_update_rs); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2186 print_summary(" Scan RS", &_scan_rs); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2187 print_summary(" Object Copy", &_obj_copy); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2188 print_summary(" Termination", &_termination); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2189 print_summary(" Parallel Other", &_parallel_other); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2190 print_summary(" Clear CT", &_clear_ct); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2191 print_summary(" Other", &_other); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2192 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2193 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2194 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2195 gclog_or_tty->print_cr("MISC"); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2196 print_summary_sd(" Stop World", &_all_stop_world_times_ms); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2197 print_summary_sd(" Yields", &_all_yield_times_ms); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2198 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2199 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2200 void TraceGen1TimeData::record_full_collection(double full_gc_time_ms) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2201 if (TraceGen1Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2202 _all_full_gc_times.add(full_gc_time_ms); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2203 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2204 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2205 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2206 void TraceGen1TimeData::print() const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2207 if (!TraceGen1Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2208 return; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2209 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2210 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2211 if (_all_full_gc_times.num() > 0) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2212 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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2213 _all_full_gc_times.num(), |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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2214 _all_full_gc_times.sum() / 1000.0); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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2215 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times.avg()); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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2216 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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2217 _all_full_gc_times.sd(), |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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2218 _all_full_gc_times.maximum()); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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2219 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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2220 } |