Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 6219:922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
Summary: Also reviewed by: vitalyd@gmail.com. Move the timing out of G1CollectorPolicy into the G1GCPhaseTimes class
Reviewed-by: johnc
author | brutisso |
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date | Wed, 11 Jul 2012 22:47:38 +0200 |
parents | bbc900c2482a |
children | a2f7274eb6ef |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
94 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
95 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 96 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
97 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 98 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 99 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 100 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
101 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
102 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
103 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
104 _non_young_other_cost_per_region_ms_seq( | |
105 new TruncatedSeq(TruncatedSeqLength)), | |
106 | |
107 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
108 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
109 | |
751 | 110 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 111 |
4710 | 112 _gcs_are_young(true), |
342 | 113 |
114 _during_marking(false), | |
115 _in_marking_window(false), | |
116 _in_marking_window_im(false), | |
117 | |
4710 | 118 _recent_prev_end_times_for_all_gcs_sec( |
119 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 120 |
121 _recent_avg_pause_time_ratio(0.0), | |
122 | |
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123 _initiate_conc_mark_if_possible(false), |
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124 _during_initial_mark_pause(false), |
4710 | 125 _last_young_gc(false), |
126 _last_gc_was_young(false), | |
342 | 127 |
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128 _eden_bytes_before_gc(0), |
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129 _survivor_bytes_before_gc(0), |
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130 _capacity_before_gc(0), |
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131 |
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132 _eden_cset_region_length(0), |
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133 _survivor_cset_region_length(0), |
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134 _old_cset_region_length(0), |
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135 |
342 | 136 _collection_set(NULL), |
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137 _collection_set_bytes_used_before(0), |
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138 |
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139 // Incremental CSet attributes |
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140 _inc_cset_build_state(Inactive), |
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141 _inc_cset_head(NULL), |
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142 _inc_cset_tail(NULL), |
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143 _inc_cset_bytes_used_before(0), |
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144 _inc_cset_max_finger(NULL), |
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145 _inc_cset_recorded_rs_lengths(0), |
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146 _inc_cset_recorded_rs_lengths_diffs(0), |
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147 _inc_cset_predicted_elapsed_time_ms(0.0), |
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148 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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149 |
342 | 150 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
151 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
152 #endif // _MSC_VER | |
153 | |
154 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
155 G1YoungSurvRateNumRegionsSummary)), | |
156 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 157 G1YoungSurvRateNumRegionsSummary)), |
342 | 158 // add here any more surv rate groups |
545 | 159 _recorded_survivor_regions(0), |
160 _recorded_survivor_head(NULL), | |
161 _recorded_survivor_tail(NULL), | |
1356 | 162 _survivors_age_table(true), |
163 | |
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164 _gc_overhead_perc(0.0) { |
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165 |
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166 // Set up the region size and associated fields. Given that the |
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167 // policy is created before the heap, we have to set this up here, |
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168 // so it's done as soon as possible. |
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169 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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170 HeapRegionRemSet::setup_remset_size(); |
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171 |
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172 G1ErgoVerbose::initialize(); |
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173 if (PrintAdaptiveSizePolicy) { |
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174 // Currently, we only use a single switch for all the heuristics. |
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175 G1ErgoVerbose::set_enabled(true); |
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176 // Given that we don't currently have a verboseness level |
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177 // parameter, we'll hardcode this to high. This can be easily |
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178 // changed in the future. |
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179 G1ErgoVerbose::set_level(ErgoHigh); |
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180 } else { |
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181 G1ErgoVerbose::set_enabled(false); |
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182 } |
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183 |
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184 // Verify PLAB sizes |
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185 const size_t region_size = HeapRegion::GrainWords; |
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186 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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187 char buffer[128]; |
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188 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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189 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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190 vm_exit_during_initialization(buffer); |
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191 } |
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192 |
342 | 193 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
194 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
195 | |
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196 _phase_times = new G1GCPhaseTimes(_parallel_gc_threads); |
342 | 197 |
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198 int index = MIN2(_parallel_gc_threads - 1, 7); |
342 | 199 |
200 _pending_card_diff_seq->add(0.0); | |
201 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
202 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 203 _young_cards_per_entry_ratio_seq->add( |
204 young_cards_per_entry_ratio_defaults[index]); | |
342 | 205 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
206 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
207 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
208 _young_other_cost_per_region_ms_seq->add( | |
209 young_other_cost_per_region_ms_defaults[index]); | |
210 _non_young_other_cost_per_region_ms_seq->add( | |
211 non_young_other_cost_per_region_ms_defaults[index]); | |
212 | |
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213 // Below, we might need to calculate the pause time target based on |
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214 // the pause interval. When we do so we are going to give G1 maximum |
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215 // flexibility and allow it to do pauses when it needs to. So, we'll |
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216 // arrange that the pause interval to be pause time target + 1 to |
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217 // ensure that a) the pause time target is maximized with respect to |
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218 // the pause interval and b) we maintain the invariant that pause |
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219 // time target < pause interval. If the user does not want this |
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220 // maximum flexibility, they will have to set the pause interval |
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221 // explicitly. |
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222 |
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223 // First make sure that, if either parameter is set, its value is |
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224 // reasonable. |
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225 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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226 if (MaxGCPauseMillis < 1) { |
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227 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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228 "greater than 0"); |
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229 } |
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230 } |
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231 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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232 if (GCPauseIntervalMillis < 1) { |
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233 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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234 "greater than 0"); |
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235 } |
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236 } |
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237 |
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238 // Then, if the pause time target parameter was not set, set it to |
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239 // the default value. |
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240 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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241 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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242 // The default pause time target in G1 is 200ms |
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243 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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244 } else { |
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245 // We do not allow the pause interval to be set without the |
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246 // pause time target |
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247 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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248 "without setting MaxGCPauseMillis"); |
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249 } |
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250 } |
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251 |
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252 // Then, if the interval parameter was not set, set it according to |
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253 // the pause time target (this will also deal with the case when the |
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254 // pause time target is the default value). |
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255 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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256 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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257 } |
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258 |
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259 // Finally, make sure that the two parameters are consistent. |
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260 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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261 char buffer[256]; |
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262 jio_snprintf(buffer, 256, |
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263 "MaxGCPauseMillis (%u) should be less than " |
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264 "GCPauseIntervalMillis (%u)", |
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265 MaxGCPauseMillis, GCPauseIntervalMillis); |
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266 vm_exit_during_initialization(buffer); |
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267 } |
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268 |
751 | 269 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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270 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 271 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 272 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 273 |
274 // start conservatively (around 50ms is about right) | |
275 _concurrent_mark_remark_times_ms->add(0.05); | |
276 _concurrent_mark_cleanup_times_ms->add(0.20); | |
277 _tenuring_threshold = MaxTenuringThreshold; | |
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278 // _max_survivor_regions will be calculated by |
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279 // update_young_list_target_length() during initialization. |
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280 _max_survivor_regions = 0; |
545 | 281 |
1356 | 282 assert(GCTimeRatio > 0, |
283 "we should have set it to a default value set_g1_gc_flags() " | |
284 "if a user set it to 0"); | |
285 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
286 | |
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287 uintx reserve_perc = G1ReservePercent; |
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288 // Put an artificial ceiling on this so that it's not set to a silly value. |
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289 if (reserve_perc > 50) { |
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290 reserve_perc = 50; |
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291 warning("G1ReservePercent is set to a value that is too large, " |
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292 "it's been updated to %u", reserve_perc); |
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293 } |
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294 _reserve_factor = (double) reserve_perc / 100.0; |
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295 // This will be set when the heap is expanded |
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296 // for the first time during initialization. |
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297 _reserve_regions = 0; |
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298 |
342 | 299 initialize_all(); |
4013 | 300 _collectionSetChooser = new CollectionSetChooser(); |
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301 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 302 } |
303 | |
304 void G1CollectorPolicy::initialize_flags() { | |
305 set_min_alignment(HeapRegion::GrainBytes); | |
306 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
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307 if (SurvivorRatio < 1) { |
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308 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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309 } |
342 | 310 CollectorPolicy::initialize_flags(); |
311 } | |
312 | |
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313 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
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314 assert(G1DefaultMinNewGenPercent <= G1DefaultMaxNewGenPercent, "Min larger than max"); |
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315 assert(G1DefaultMinNewGenPercent > 0 && G1DefaultMinNewGenPercent < 100, "Min out of bounds"); |
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316 assert(G1DefaultMaxNewGenPercent > 0 && G1DefaultMaxNewGenPercent < 100, "Max out of bounds"); |
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317 |
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318 if (FLAG_IS_CMDLINE(NewRatio)) { |
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319 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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320 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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321 } else { |
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322 _sizer_kind = SizerNewRatio; |
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323 _adaptive_size = false; |
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324 return; |
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325 } |
3976 | 326 } |
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327 |
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328 if (FLAG_IS_CMDLINE(NewSize)) { |
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329 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), |
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330 1U); |
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331 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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332 _max_desired_young_length = |
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333 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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334 1U); |
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335 _sizer_kind = SizerMaxAndNewSize; |
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336 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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337 } else { |
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338 _sizer_kind = SizerNewSizeOnly; |
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339 } |
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340 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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341 _max_desired_young_length = |
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342 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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343 1U); |
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344 _sizer_kind = SizerMaxNewSizeOnly; |
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345 } |
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346 } |
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347 |
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348 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { |
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349 uint default_value = (new_number_of_heap_regions * G1DefaultMinNewGenPercent) / 100; |
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350 return MAX2(1U, default_value); |
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351 } |
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352 |
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353 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { |
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354 uint default_value = (new_number_of_heap_regions * G1DefaultMaxNewGenPercent) / 100; |
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355 return MAX2(1U, default_value); |
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356 } |
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357 |
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358 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { |
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359 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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360 |
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361 switch (_sizer_kind) { |
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362 case SizerDefaults: |
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363 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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364 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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365 break; |
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366 case SizerNewSizeOnly: |
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367 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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368 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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369 break; |
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370 case SizerMaxNewSizeOnly: |
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371 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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372 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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373 break; |
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374 case SizerMaxAndNewSize: |
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375 // Do nothing. Values set on the command line, don't update them at runtime. |
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376 break; |
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377 case SizerNewRatio: |
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378 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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379 _max_desired_young_length = _min_desired_young_length; |
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380 break; |
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381 default: |
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382 ShouldNotReachHere(); |
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383 } |
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384 |
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385 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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386 } |
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387 |
342 | 388 void G1CollectorPolicy::init() { |
389 // Set aside an initial future to_space. | |
390 _g1 = G1CollectedHeap::heap(); | |
391 | |
392 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
393 | |
545 | 394 initialize_gc_policy_counters(); |
395 | |
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396 if (adaptive_young_list_length()) { |
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397 _young_list_fixed_length = 0; |
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398 } else { |
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399 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 400 } |
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401 _free_regions_at_end_of_collection = _g1->free_regions(); |
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402 update_young_list_target_length(); |
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403 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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404 |
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405 // We may immediately start allocating regions and placing them on the |
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406 // collection set list. Initialize the per-collection set info |
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407 start_incremental_cset_building(); |
342 | 408 } |
409 | |
545 | 410 // Create the jstat counters for the policy. |
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411 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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412 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 413 } |
414 | |
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415 bool G1CollectorPolicy::predict_will_fit(uint young_length, |
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416 double base_time_ms, |
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417 uint base_free_regions, |
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418 double target_pause_time_ms) { |
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419 if (young_length >= base_free_regions) { |
342 | 420 // end condition 1: not enough space for the young regions |
421 return false; | |
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422 } |
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423 |
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424 double accum_surv_rate = accum_yg_surv_rate_pred((int) young_length - 1); |
342 | 425 size_t bytes_to_copy = |
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426 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 427 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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428 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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429 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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430 if (pause_time_ms > target_pause_time_ms) { |
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431 // end condition 2: prediction is over the target pause time |
342 | 432 return false; |
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433 } |
342 | 434 |
435 size_t free_bytes = | |
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436 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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437 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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438 // end condition 3: out-of-space (conservatively!) |
342 | 439 return false; |
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440 } |
342 | 441 |
442 // success! | |
443 return true; | |
444 } | |
445 | |
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446 void G1CollectorPolicy::record_new_heap_size(uint new_number_of_regions) { |
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447 // re-calculate the necessary reserve |
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448 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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449 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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450 // smaller than 1.0) we'll get 1. |
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451 _reserve_regions = (uint) ceil(reserve_regions_d); |
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452 |
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453 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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454 } |
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455 |
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456 uint G1CollectorPolicy::calculate_young_list_desired_min_length( |
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457 uint base_min_length) { |
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458 uint desired_min_length = 0; |
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459 if (adaptive_young_list_length()) { |
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460 if (_alloc_rate_ms_seq->num() > 3) { |
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461 double now_sec = os::elapsedTime(); |
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462 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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463 double alloc_rate_ms = predict_alloc_rate_ms(); |
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464 desired_min_length = (uint) ceil(alloc_rate_ms * when_ms); |
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465 } else { |
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466 // otherwise we don't have enough info to make the prediction |
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467 } |
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468 } |
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469 desired_min_length += base_min_length; |
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470 // make sure we don't go below any user-defined minimum bound |
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471 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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472 } |
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473 |
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474 uint G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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475 // Here, we might want to also take into account any additional |
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476 // constraints (i.e., user-defined minimum bound). Currently, we |
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477 // effectively don't set this bound. |
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478 return _young_gen_sizer->max_desired_young_length(); |
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479 } |
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480 |
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481 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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482 if (rs_lengths == (size_t) -1) { |
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483 // if it's set to the default value (-1), we should predict it; |
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484 // otherwise, use the given value. |
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485 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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486 } |
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487 |
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488 // Calculate the absolute and desired min bounds. |
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489 |
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490 // This is how many young regions we already have (currently: the survivors). |
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491 uint base_min_length = recorded_survivor_regions(); |
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492 // This is the absolute minimum young length, which ensures that we |
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493 // can allocate one eden region in the worst-case. |
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494 uint absolute_min_length = base_min_length + 1; |
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495 uint desired_min_length = |
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496 calculate_young_list_desired_min_length(base_min_length); |
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497 if (desired_min_length < absolute_min_length) { |
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498 desired_min_length = absolute_min_length; |
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499 } |
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500 |
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501 // Calculate the absolute and desired max bounds. |
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502 |
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503 // We will try our best not to "eat" into the reserve. |
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504 uint absolute_max_length = 0; |
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505 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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506 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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507 } |
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508 uint desired_max_length = calculate_young_list_desired_max_length(); |
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509 if (desired_max_length > absolute_max_length) { |
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510 desired_max_length = absolute_max_length; |
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511 } |
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512 |
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513 uint young_list_target_length = 0; |
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514 if (adaptive_young_list_length()) { |
4710 | 515 if (gcs_are_young()) { |
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516 young_list_target_length = |
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517 calculate_young_list_target_length(rs_lengths, |
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518 base_min_length, |
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519 desired_min_length, |
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520 desired_max_length); |
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521 _rs_lengths_prediction = rs_lengths; |
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522 } else { |
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523 // Don't calculate anything and let the code below bound it to |
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524 // the desired_min_length, i.e., do the next GC as soon as |
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525 // possible to maximize how many old regions we can add to it. |
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526 } |
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527 } else { |
4912
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528 // The user asked for a fixed young gen so we'll fix the young gen |
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529 // whether the next GC is young or mixed. |
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530 young_list_target_length = _young_list_fixed_length; |
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531 } |
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532 |
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533 // Make sure we don't go over the desired max length, nor under the |
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534 // desired min length. In case they clash, desired_min_length wins |
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535 // which is why that test is second. |
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536 if (young_list_target_length > desired_max_length) { |
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537 young_list_target_length = desired_max_length; |
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538 } |
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539 if (young_list_target_length < desired_min_length) { |
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540 young_list_target_length = desired_min_length; |
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541 } |
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542 |
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543 assert(young_list_target_length > recorded_survivor_regions(), |
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544 "we should be able to allocate at least one eden region"); |
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545 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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546 _young_list_target_length = young_list_target_length; |
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547 |
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548 update_max_gc_locker_expansion(); |
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549 } |
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550 |
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551 uint |
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552 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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553 uint base_min_length, |
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554 uint desired_min_length, |
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555 uint desired_max_length) { |
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556 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 557 assert(gcs_are_young(), "only call this for young GCs"); |
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558 |
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559 // In case some edge-condition makes the desired max length too small... |
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560 if (desired_max_length <= desired_min_length) { |
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561 return desired_min_length; |
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562 } |
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563 |
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564 // We'll adjust min_young_length and max_young_length not to include |
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565 // the already allocated young regions (i.e., so they reflect the |
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566 // min and max eden regions we'll allocate). The base_min_length |
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567 // will be reflected in the predictions by the |
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568 // survivor_regions_evac_time prediction. |
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569 assert(desired_min_length > base_min_length, "invariant"); |
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570 uint min_young_length = desired_min_length - base_min_length; |
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571 assert(desired_max_length > base_min_length, "invariant"); |
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572 uint max_young_length = desired_max_length - base_min_length; |
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573 |
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574 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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575 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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576 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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577 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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578 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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579 double base_time_ms = |
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580 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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581 survivor_regions_evac_time; |
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582 uint available_free_regions = _free_regions_at_end_of_collection; |
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583 uint base_free_regions = 0; |
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584 if (available_free_regions > _reserve_regions) { |
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585 base_free_regions = available_free_regions - _reserve_regions; |
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586 } |
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587 |
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588 // Here, we will make sure that the shortest young length that |
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589 // makes sense fits within the target pause time. |
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590 |
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591 if (predict_will_fit(min_young_length, base_time_ms, |
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592 base_free_regions, target_pause_time_ms)) { |
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593 // The shortest young length will fit into the target pause time; |
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594 // we'll now check whether the absolute maximum number of young |
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595 // regions will fit in the target pause time. If not, we'll do |
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596 // a binary search between min_young_length and max_young_length. |
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597 if (predict_will_fit(max_young_length, base_time_ms, |
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598 base_free_regions, target_pause_time_ms)) { |
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599 // The maximum young length will fit into the target pause time. |
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600 // We are done so set min young length to the maximum length (as |
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601 // the result is assumed to be returned in min_young_length). |
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602 min_young_length = max_young_length; |
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603 } else { |
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604 // The maximum possible number of young regions will not fit within |
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605 // the target pause time so we'll search for the optimal |
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606 // length. The loop invariants are: |
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607 // |
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608 // min_young_length < max_young_length |
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609 // min_young_length is known to fit into the target pause time |
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610 // max_young_length is known not to fit into the target pause time |
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611 // |
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612 // Going into the loop we know the above hold as we've just |
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613 // checked them. Every time around the loop we check whether |
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614 // the middle value between min_young_length and |
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615 // max_young_length fits into the target pause time. If it |
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616 // does, it becomes the new min. If it doesn't, it becomes |
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617 // the new max. This way we maintain the loop invariants. |
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618 |
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619 assert(min_young_length < max_young_length, "invariant"); |
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620 uint diff = (max_young_length - min_young_length) / 2; |
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621 while (diff > 0) { |
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622 uint young_length = min_young_length + diff; |
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623 if (predict_will_fit(young_length, base_time_ms, |
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624 base_free_regions, target_pause_time_ms)) { |
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625 min_young_length = young_length; |
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626 } else { |
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627 max_young_length = young_length; |
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628 } |
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629 assert(min_young_length < max_young_length, "invariant"); |
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630 diff = (max_young_length - min_young_length) / 2; |
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631 } |
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632 // The results is min_young_length which, according to the |
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633 // loop invariants, should fit within the target pause time. |
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634 |
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635 // These are the post-conditions of the binary search above: |
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636 assert(min_young_length < max_young_length, |
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637 "otherwise we should have discovered that max_young_length " |
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638 "fits into the pause target and not done the binary search"); |
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639 assert(predict_will_fit(min_young_length, base_time_ms, |
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640 base_free_regions, target_pause_time_ms), |
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641 "min_young_length, the result of the binary search, should " |
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642 "fit into the pause target"); |
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643 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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644 base_free_regions, target_pause_time_ms), |
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645 "min_young_length, the result of the binary search, should be " |
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646 "optimal, so no larger length should fit into the pause target"); |
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647 } |
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648 } else { |
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649 // Even the minimum length doesn't fit into the pause time |
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650 // target, return it as the result nevertheless. |
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651 } |
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652 return base_min_length + min_young_length; |
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653 } |
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654 |
545 | 655 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
656 double survivor_regions_evac_time = 0.0; | |
657 for (HeapRegion * r = _recorded_survivor_head; | |
658 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
659 r = r->get_next_young_region()) { | |
660 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
661 } | |
662 return survivor_regions_evac_time; | |
663 } | |
664 | |
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665 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 666 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
667 | |
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668 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 669 if (rs_lengths > _rs_lengths_prediction) { |
670 // add 10% to avoid having to recalculate often | |
671 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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672 update_young_list_target_length(rs_lengths_prediction); |
342 | 673 } |
674 } | |
675 | |
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676 |
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677 |
342 | 678 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
679 bool is_tlab, | |
680 bool* gc_overhead_limit_was_exceeded) { | |
681 guarantee(false, "Not using this policy feature yet."); | |
682 return NULL; | |
683 } | |
684 | |
685 // This method controls how a collector handles one or more | |
686 // of its generations being fully allocated. | |
687 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
688 bool is_tlab) { | |
689 guarantee(false, "Not using this policy feature yet."); | |
690 return NULL; | |
691 } | |
692 | |
693 | |
694 #ifndef PRODUCT | |
695 bool G1CollectorPolicy::verify_young_ages() { | |
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696 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 697 return |
698 verify_young_ages(head, _short_lived_surv_rate_group); | |
699 // also call verify_young_ages on any additional surv rate groups | |
700 } | |
701 | |
702 bool | |
703 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
704 SurvRateGroup *surv_rate_group) { | |
705 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
706 | |
707 const char* name = surv_rate_group->name(); | |
708 bool ret = true; | |
709 int prev_age = -1; | |
710 | |
711 for (HeapRegion* curr = head; | |
712 curr != NULL; | |
713 curr = curr->get_next_young_region()) { | |
714 SurvRateGroup* group = curr->surv_rate_group(); | |
715 if (group == NULL && !curr->is_survivor()) { | |
716 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
717 ret = false; | |
718 } | |
719 | |
720 if (surv_rate_group == group) { | |
721 int age = curr->age_in_surv_rate_group(); | |
722 | |
723 if (age < 0) { | |
724 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
725 ret = false; | |
726 } | |
727 | |
728 if (age <= prev_age) { | |
729 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
730 "(%d, %d)", name, age, prev_age); | |
731 ret = false; | |
732 } | |
733 prev_age = age; | |
734 } | |
735 } | |
736 | |
737 return ret; | |
738 } | |
739 #endif // PRODUCT | |
740 | |
741 void G1CollectorPolicy::record_full_collection_start() { | |
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742 _full_collection_start_sec = os::elapsedTime(); |
342 | 743 // Release the future to-space so that it is available for compaction into. |
744 _g1->set_full_collection(); | |
745 } | |
746 | |
747 void G1CollectorPolicy::record_full_collection_end() { | |
748 // Consider this like a collection pause for the purposes of allocation | |
749 // since last pause. | |
750 double end_sec = os::elapsedTime(); | |
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751 double full_gc_time_sec = end_sec - _full_collection_start_sec; |
342 | 752 double full_gc_time_ms = full_gc_time_sec * 1000.0; |
753 | |
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754 _trace_gen1_time_data.record_full_collection(full_gc_time_ms); |
342 | 755 |
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756 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 757 |
758 _g1->clear_full_collection(); | |
759 | |
4710 | 760 // "Nuke" the heuristics that control the young/mixed GC |
761 // transitions and make sure we start with young GCs after the Full GC. | |
762 set_gcs_are_young(true); | |
763 _last_young_gc = false; | |
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764 clear_initiate_conc_mark_if_possible(); |
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765 clear_during_initial_mark_pause(); |
342 | 766 _in_marking_window = false; |
767 _in_marking_window_im = false; | |
768 | |
769 _short_lived_surv_rate_group->start_adding_regions(); | |
770 // also call this on any additional surv rate groups | |
771 | |
545 | 772 record_survivor_regions(0, NULL, NULL); |
773 | |
342 | 774 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 775 // Reset survivors SurvRateGroup. |
776 _survivor_surv_rate_group->reset(); | |
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777 update_young_list_target_length(); |
6011 | 778 _collectionSetChooser->clear(); |
1973 | 779 } |
342 | 780 |
781 void G1CollectorPolicy::record_stop_world_start() { | |
782 _stop_world_start = os::elapsedTime(); | |
783 } | |
784 | |
785 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
786 size_t start_used) { | |
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787 // We only need to do this here as the policy will only be applied |
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788 // to the GC we're about to start. so, no point is calculating this |
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789 // every time we calculate / recalculate the target young length. |
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790 update_survivors_policy(); |
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791 |
1973 | 792 assert(_g1->used() == _g1->recalculate_used(), |
793 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
794 _g1->used(), _g1->recalculate_used())); | |
342 | 795 |
796 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
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797 _trace_gen0_time_data.record_start_collection(s_w_t_ms); |
342 | 798 _stop_world_start = 0.0; |
799 | |
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800 phase_times()->_cur_collection_start_sec = start_time_sec; |
342 | 801 _cur_collection_pause_used_at_start_bytes = start_used; |
802 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
803 _pending_cards = _g1->pending_card_num(); | |
804 _max_pending_cards = _g1->max_pending_card_num(); | |
805 | |
806 _bytes_in_collection_set_before_gc = 0; | |
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807 _bytes_copied_during_gc = 0; |
342 | 808 |
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809 YoungList* young_list = _g1->young_list(); |
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810 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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811 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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812 _capacity_before_gc = _g1->capacity(); |
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813 |
4710 | 814 _last_gc_was_young = false; |
342 | 815 |
816 // do that for any other surv rate groups | |
817 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 818 _survivors_age_table.clear(); |
545 | 819 |
342 | 820 assert( verify_young_ages(), "region age verification" ); |
821 } | |
822 | |
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823 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 824 mark_init_elapsed_time_ms) { |
825 _during_marking = true; | |
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826 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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827 clear_during_initial_mark_pause(); |
342 | 828 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
829 } | |
830 | |
831 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
832 _mark_remark_start_sec = os::elapsedTime(); | |
833 _during_marking = false; | |
834 } | |
835 | |
836 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
837 double end_time_sec = os::elapsedTime(); | |
838 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
839 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
840 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
841 _prev_collection_pause_end_ms += elapsed_time_ms; | |
842 | |
843 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
844 } | |
845 | |
846 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
847 _mark_cleanup_start_sec = os::elapsedTime(); | |
848 } | |
849 | |
4013 | 850 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 851 _last_young_gc = true; |
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852 _in_marking_window = false; |
342 | 853 } |
854 | |
855 void G1CollectorPolicy::record_concurrent_pause() { | |
856 if (_stop_world_start > 0.0) { | |
857 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
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858 _trace_gen0_time_data.record_yield_time(yield_ms); |
342 | 859 } |
860 } | |
861 | |
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862 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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863 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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864 return false; |
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865 } |
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866 |
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867 size_t marking_initiating_used_threshold = |
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868 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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869 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
4834
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870 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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871 |
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872 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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873 if (gcs_are_young()) { |
4834
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874 ergo_verbose5(ErgoConcCycles, |
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875 "request concurrent cycle initiation", |
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876 ergo_format_reason("occupancy higher than threshold") |
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877 ergo_format_byte("occupancy") |
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878 ergo_format_byte("allocation request") |
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879 ergo_format_byte_perc("threshold") |
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880 ergo_format_str("source"), |
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881 cur_used_bytes, |
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882 alloc_byte_size, |
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883 marking_initiating_used_threshold, |
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884 (double) InitiatingHeapOccupancyPercent, |
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885 source); |
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|
886 return true; |
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|
887 } else { |
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888 ergo_verbose5(ErgoConcCycles, |
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889 "do not request concurrent cycle initiation", |
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890 ergo_format_reason("still doing mixed collections") |
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|
891 ergo_format_byte("occupancy") |
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892 ergo_format_byte("allocation request") |
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893 ergo_format_byte_perc("threshold") |
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894 ergo_format_str("source"), |
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|
895 cur_used_bytes, |
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|
896 alloc_byte_size, |
4829
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897 marking_initiating_used_threshold, |
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|
898 (double) InitiatingHeapOccupancyPercent, |
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|
899 source); |
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|
900 } |
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|
901 } |
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|
902 |
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|
903 return false; |
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|
904 } |
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905 |
342 | 906 // Anything below that is considered to be zero |
907 #define MIN_TIMER_GRANULARITY 0.0000001 | |
908 | |
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909 void G1CollectorPolicy::record_collection_pause_end(double pause_time_ms) { |
342 | 910 double end_time_sec = os::elapsedTime(); |
4090
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911 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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912 "otherwise, the subtraction below does not make sense"); |
342 | 913 size_t rs_size = |
4090
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914 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 915 size_t cur_used_bytes = _g1->used(); |
916 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
917 bool last_pause_included_initial_mark = false; | |
1707 | 918 bool update_stats = !_g1->evacuation_failed(); |
342 | 919 |
920 #ifndef PRODUCT | |
921 if (G1YoungSurvRateVerbose) { | |
922 gclog_or_tty->print_cr(""); | |
923 _short_lived_surv_rate_group->print(); | |
924 // do that for any other surv rate groups too | |
925 } | |
926 #endif // PRODUCT | |
927 | |
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928 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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929 if (last_pause_included_initial_mark) { |
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930 record_concurrent_mark_init_end(0.0); |
4912
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931 } else if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
4829
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932 // Note: this might have already been set, if during the last |
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933 // pause we decided to start a cycle but at the beginning of |
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934 // this pause we decided to postpone it. That's OK. |
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935 set_initiate_conc_mark_if_possible(); |
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936 } |
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937 |
6219
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938 _mmu_tracker->add_pause(end_time_sec - pause_time_ms/1000.0, |
342 | 939 end_time_sec, false); |
940 | |
941 size_t freed_bytes = | |
942 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
943 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
1316cec51b4d
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|
944 |
342 | 945 double survival_fraction = |
946 (double)surviving_bytes/ | |
947 (double)_collection_set_bytes_used_before; | |
948 | |
595
3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
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|
949 if (update_stats) { |
6219
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950 _trace_gen0_time_data.record_end_collection(pause_time_ms, phase_times()); |
342 | 951 // this is where we update the allocation rate of the application |
952 double app_time_ms = | |
6219
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953 (phase_times()->_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); |
342 | 954 if (app_time_ms < MIN_TIMER_GRANULARITY) { |
955 // This usually happens due to the timer not having the required | |
956 // granularity. Some Linuxes are the usual culprits. | |
957 // We'll just set it to something (arbitrarily) small. | |
958 app_time_ms = 1.0; | |
959 } | |
4090
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960 // We maintain the invariant that all objects allocated by mutator |
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961 // threads will be allocated out of eden regions. So, we can use |
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962 // the eden region number allocated since the previous GC to |
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963 // calculate the application's allocate rate. The only exception |
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964 // to that is humongous objects that are allocated separately. But |
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965 // given that humongous object allocations do not really affect |
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966 // either the pause's duration nor when the next pause will take |
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967 // 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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|
968 uint regions_allocated = eden_cset_region_length(); |
342 | 969 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
970 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
971 | |
972 double interval_ms = | |
973 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
6219
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974 update_recent_gc_times(end_time_sec, pause_time_ms); |
342 | 975 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
1086
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976 if (recent_avg_pause_time_ratio() < 0.0 || |
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977 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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978 #ifndef PRODUCT |
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979 // Dump info to allow post-facto debugging |
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980 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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|
981 gclog_or_tty->print_cr("-------------------------------------------"); |
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982 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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983 _recent_gc_times_ms->dump(); |
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984 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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985 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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|
986 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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|
987 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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|
988 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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989 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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990 #endif // !PRODUCT |
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991 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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992 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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993 if (_recent_avg_pause_time_ratio < 0.0) { |
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994 _recent_avg_pause_time_ratio = 0.0; |
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995 } else { |
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996 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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997 _recent_avg_pause_time_ratio = 1.0; |
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998 } |
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|
999 } |
342 | 1000 } |
1001 bool new_in_marking_window = _in_marking_window; | |
1002 bool new_in_marking_window_im = false; | |
1359
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|
1003 if (during_initial_mark_pause()) { |
342 | 1004 new_in_marking_window = true; |
1005 new_in_marking_window_im = true; | |
1006 } | |
1007 | |
4710 | 1008 if (_last_young_gc) { |
4912
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1009 // This is supposed to to be the "last young GC" before we start |
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1010 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1011 |
3982
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1012 if (!last_pause_included_initial_mark) { |
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1013 if (next_gc_should_be_mixed("start mixed GCs", |
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1014 "do not start mixed GCs")) { |
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1015 set_gcs_are_young(false); |
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1016 } |
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1017 } else { |
4710 | 1018 ergo_verbose0(ErgoMixedGCs, |
1019 "do not start mixed GCs", | |
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1020 ergo_format_reason("concurrent cycle is about to start")); |
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1021 } |
4710 | 1022 _last_young_gc = false; |
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1023 } |
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1024 |
4710 | 1025 if (!_last_gc_was_young) { |
4912
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1026 // This is a mixed GC. Here we decide whether to continue doing |
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1027 // mixed GCs or not. |
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1028 |
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1029 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1030 "do not continue mixed GCs")) { |
4710 | 1031 set_gcs_are_young(true); |
342 | 1032 } |
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1033 } |
4710 | 1034 |
342 | 1035 _short_lived_surv_rate_group->start_adding_regions(); |
1036 // do that for any other surv rate groupsx | |
1037 | |
677 | 1038 if (update_stats) { |
342 | 1039 size_t diff = 0; |
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1040 if (_max_pending_cards >= _pending_cards) { |
342 | 1041 diff = _max_pending_cards - _pending_cards; |
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1042 } |
342 | 1043 _pending_card_diff_seq->add((double) diff); |
1044 | |
1045 double cost_per_card_ms = 0.0; | |
1046 if (_pending_cards > 0) { | |
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1047 cost_per_card_ms = phase_times()->_update_rs_time / (double) _pending_cards; |
342 | 1048 _cost_per_card_ms_seq->add(cost_per_card_ms); |
1049 } | |
1050 | |
1051 size_t cards_scanned = _g1->cards_scanned(); | |
1052 | |
1053 double cost_per_entry_ms = 0.0; | |
1054 if (cards_scanned > 10) { | |
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1055 cost_per_entry_ms = phase_times()->_scan_rs_time / (double) cards_scanned; |
4710 | 1056 if (_last_gc_was_young) { |
342 | 1057 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1058 } else { |
1059 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1060 } | |
342 | 1061 } |
1062 | |
1063 if (_max_rs_lengths > 0) { | |
1064 double cards_per_entry_ratio = | |
1065 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1066 if (_last_gc_was_young) { |
1067 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1068 } else { | |
1069 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1070 } | |
342 | 1071 } |
1072 | |
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1073 // This is defensive. For a while _max_rs_lengths could get |
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1074 // smaller than _recorded_rs_lengths which was causing |
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1075 // rs_length_diff to get very large and mess up the RSet length |
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1076 // predictions. The reason was unsafe concurrent updates to the |
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1077 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1078 // against (see CR 7118202). This bug has now been fixed (see CR |
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1079 // 7119027). However, I'm still worried that |
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1080 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1081 // inaccurate. The concurrent refinement thread calculates an |
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1082 // RSet's length concurrently with other CR threads updating it |
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1083 // which might cause it to calculate the length incorrectly (if, |
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1084 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1085 // conditional below just in case. |
4130
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1086 size_t rs_length_diff = 0; |
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1087 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1088 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1089 } |
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1090 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1091 |
1092 size_t copied_bytes = surviving_bytes; | |
1093 double cost_per_byte_ms = 0.0; | |
1094 if (copied_bytes > 0) { | |
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1095 cost_per_byte_ms = phase_times()->_obj_copy_time / (double) copied_bytes; |
4710 | 1096 if (_in_marking_window) { |
342 | 1097 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1098 } else { |
342 | 1099 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1100 } |
342 | 1101 } |
1102 | |
1103 double all_other_time_ms = pause_time_ms - | |
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1104 (phase_times()->_update_rs_time + phase_times()->_scan_rs_time + phase_times()->_obj_copy_time + phase_times()->_termination_time); |
342 | 1105 |
1106 double young_other_time_ms = 0.0; | |
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1107 if (young_cset_region_length() > 0) { |
342 | 1108 young_other_time_ms = |
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1109 phase_times()->_recorded_young_cset_choice_time_ms + |
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1110 phase_times()->_recorded_young_free_cset_time_ms; |
342 | 1111 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
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1112 (double) young_cset_region_length()); |
342 | 1113 } |
1114 double non_young_other_time_ms = 0.0; | |
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1115 if (old_cset_region_length() > 0) { |
342 | 1116 non_young_other_time_ms = |
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1117 phase_times()->_recorded_non_young_cset_choice_time_ms + |
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1118 phase_times()->_recorded_non_young_free_cset_time_ms; |
342 | 1119 |
1120 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1121 (double) old_cset_region_length()); |
342 | 1122 } |
1123 | |
1124 double constant_other_time_ms = all_other_time_ms - | |
1125 (young_other_time_ms + non_young_other_time_ms); | |
1126 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1127 | |
1128 double survival_ratio = 0.0; | |
1129 if (_bytes_in_collection_set_before_gc > 0) { | |
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1130 survival_ratio = (double) _bytes_copied_during_gc / |
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1131 (double) _bytes_in_collection_set_before_gc; |
342 | 1132 } |
1133 | |
1134 _pending_cards_seq->add((double) _pending_cards); | |
1135 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1136 } | |
1137 | |
1138 _in_marking_window = new_in_marking_window; | |
1139 _in_marking_window_im = new_in_marking_window_im; | |
1140 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1141 update_young_list_target_length(); |
342 | 1142 |
1111 | 1143 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1144 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
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1145 adjust_concurrent_refinement(phase_times()->_update_rs_time, phase_times()->_update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1146 |
6011 | 1147 _collectionSetChooser->verify(); |
342 | 1148 } |
1149 | |
6059 | 1150 #define EXT_SIZE_FORMAT "%.1f%s" |
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1151 #define EXT_SIZE_PARAMS(bytes) \ |
6059 | 1152 byte_size_in_proper_unit((double)(bytes)), \ |
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1153 proper_unit_for_byte_size((bytes)) |
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1154 |
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1155 void G1CollectorPolicy::print_heap_transition() { |
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1156 if (G1Log::finer()) { |
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1157 YoungList* young_list = _g1->young_list(); |
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1158 size_t eden_bytes = young_list->eden_used_bytes(); |
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1159 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1160 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1161 size_t used = _g1->used(); |
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1162 size_t capacity = _g1->capacity(); |
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1163 size_t eden_capacity = |
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1164 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1165 |
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1166 gclog_or_tty->print_cr( |
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1167 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1168 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1169 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1170 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1171 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1172 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1173 EXT_SIZE_PARAMS(eden_bytes), |
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1174 EXT_SIZE_PARAMS(eden_capacity), |
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1175 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1176 EXT_SIZE_PARAMS(survivor_bytes), |
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1177 EXT_SIZE_PARAMS(used_before_gc), |
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1178 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1179 EXT_SIZE_PARAMS(used), |
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1180 EXT_SIZE_PARAMS(capacity)); |
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1181 |
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1182 _prev_eden_capacity = eden_capacity; |
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1183 } else if (G1Log::fine()) { |
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1184 _g1->print_size_transition(gclog_or_tty, |
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1185 _cur_collection_pause_used_at_start_bytes, |
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1186 _g1->used(), _g1->capacity()); |
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1187 } |
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1188 } |
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1189 |
1111 | 1190 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1191 double update_rs_processed_buffers, | |
1192 double goal_ms) { | |
1193 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1194 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1195 | |
1282 | 1196 if (G1UseAdaptiveConcRefinement) { |
1111 | 1197 const int k_gy = 3, k_gr = 6; |
1198 const double inc_k = 1.1, dec_k = 0.9; | |
1199 | |
1200 int g = cg1r->green_zone(); | |
1201 if (update_rs_time > goal_ms) { | |
1202 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1203 } else { | |
1204 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1205 g = (int)MAX2(g * inc_k, g + 1.0); | |
1206 } | |
1207 } | |
1208 // Change the refinement threads params | |
1209 cg1r->set_green_zone(g); | |
1210 cg1r->set_yellow_zone(g * k_gy); | |
1211 cg1r->set_red_zone(g * k_gr); | |
1212 cg1r->reinitialize_threads(); | |
1213 | |
1214 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1215 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1216 cg1r->yellow_zone()); | |
1217 // Change the barrier params | |
1218 dcqs.set_process_completed_threshold(processing_threshold); | |
1219 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1220 } | |
1221 | |
1222 int curr_queue_size = dcqs.completed_buffers_num(); | |
1223 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1224 dcqs.set_completed_queue_padding(curr_queue_size); | |
1225 } else { | |
1226 dcqs.set_completed_queue_padding(0); | |
1227 } | |
1228 dcqs.notify_if_necessary(); | |
1229 } | |
1230 | |
342 | 1231 double |
1232 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1233 size_t rs_length = predict_rs_length_diff(); | |
1234 size_t card_num; | |
4710 | 1235 if (gcs_are_young()) { |
342 | 1236 card_num = predict_young_card_num(rs_length); |
4710 | 1237 } else { |
342 | 1238 card_num = predict_non_young_card_num(rs_length); |
4710 | 1239 } |
342 | 1240 return predict_base_elapsed_time_ms(pending_cards, card_num); |
1241 } | |
1242 | |
1243 double | |
1244 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1245 size_t scanned_cards) { | |
1246 return | |
1247 predict_rs_update_time_ms(pending_cards) + | |
1248 predict_rs_scan_time_ms(scanned_cards) + | |
1249 predict_constant_other_time_ms(); | |
1250 } | |
1251 | |
1252 double | |
1253 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1254 bool young) { | |
1255 size_t rs_length = hr->rem_set()->occupied(); | |
1256 size_t card_num; | |
4710 | 1257 if (gcs_are_young()) { |
342 | 1258 card_num = predict_young_card_num(rs_length); |
4710 | 1259 } else { |
342 | 1260 card_num = predict_non_young_card_num(rs_length); |
4710 | 1261 } |
342 | 1262 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1263 | |
1264 double region_elapsed_time_ms = | |
1265 predict_rs_scan_time_ms(card_num) + | |
1266 predict_object_copy_time_ms(bytes_to_copy); | |
1267 | |
1268 if (young) | |
1269 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1270 else | |
1271 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1272 | |
1273 return region_elapsed_time_ms; | |
1274 } | |
1275 | |
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1276 size_t G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
342 | 1277 size_t bytes_to_copy; |
1278 if (hr->is_marked()) | |
1279 bytes_to_copy = hr->max_live_bytes(); | |
1280 else { | |
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1281 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1282 int age = hr->age_in_surv_rate_group(); |
545 | 1283 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1284 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1285 } | |
1286 return bytes_to_copy; | |
1287 } | |
1288 | |
1289 void | |
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1290 G1CollectorPolicy::init_cset_region_lengths(uint eden_cset_region_length, |
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1291 uint survivor_cset_region_length) { |
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1292 _eden_cset_region_length = eden_cset_region_length; |
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1293 _survivor_cset_region_length = survivor_cset_region_length; |
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1294 _old_cset_region_length = 0; |
1394
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1295 } |
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1296 |
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1297 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1298 _recorded_rs_lengths = rs_lengths; |
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1299 } |
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1300 |
342 | 1301 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1302 double elapsed_ms) { | |
1303 _recent_gc_times_ms->add(elapsed_ms); | |
1304 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1305 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1306 } | |
1307 | |
1308 size_t G1CollectorPolicy::expansion_amount() { | |
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1309 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1310 double threshold = _gc_overhead_perc; |
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1311 if (recent_gc_overhead > threshold) { |
751 | 1312 // We will double the existing space, or take |
1313 // G1ExpandByPercentOfAvailable % of the available expansion | |
1314 // space, whichever is smaller, bounded below by a minimum | |
1315 // expansion (unless that's all that's left.) | |
342 | 1316 const size_t min_expand_bytes = 1*M; |
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1317 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1318 size_t committed_bytes = _g1->capacity(); |
1319 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1320 size_t expand_bytes; | |
1321 size_t expand_bytes_via_pct = | |
751 | 1322 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1323 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1324 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1325 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1326 |
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1327 ergo_verbose5(ErgoHeapSizing, |
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1328 "attempt heap expansion", |
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1329 ergo_format_reason("recent GC overhead higher than " |
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1330 "threshold after GC") |
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1331 ergo_format_perc("recent GC overhead") |
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1332 ergo_format_perc("threshold") |
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1333 ergo_format_byte("uncommitted") |
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1334 ergo_format_byte_perc("calculated expansion amount"), |
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1335 recent_gc_overhead, threshold, |
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1336 uncommitted_bytes, |
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1337 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1338 |
342 | 1339 return expand_bytes; |
1340 } else { | |
1341 return 0; | |
1342 } | |
1343 } | |
1344 | |
1345 class CountCSClosure: public HeapRegionClosure { | |
1346 G1CollectorPolicy* _g1_policy; | |
1347 public: | |
1348 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1349 _g1_policy(g1_policy) {} | |
1350 bool doHeapRegion(HeapRegion* r) { | |
1351 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1352 return false; | |
1353 } | |
1354 }; | |
1355 | |
1356 void G1CollectorPolicy::count_CS_bytes_used() { | |
1357 CountCSClosure cs_closure(this); | |
1358 _g1->collection_set_iterate(&cs_closure); | |
1359 } | |
1360 | |
1361 void G1CollectorPolicy::print_tracing_info() const { | |
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1362 _trace_gen0_time_data.print(); |
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1363 _trace_gen1_time_data.print(); |
342 | 1364 } |
1365 | |
1366 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
1367 #ifndef PRODUCT | |
1368 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
1369 // add this call for any other surv rate groups | |
1370 #endif // PRODUCT | |
1371 } | |
1372 | |
1373 #ifndef PRODUCT | |
1374 // for debugging, bit of a hack... | |
1375 static char* | |
1376 region_num_to_mbs(int length) { | |
1377 static char buffer[64]; | |
1378 double bytes = (double) (length * HeapRegion::GrainBytes); | |
1379 double mbs = bytes / (double) (1024 * 1024); | |
1380 sprintf(buffer, "%7.2lfMB", mbs); | |
1381 return buffer; | |
1382 } | |
1383 #endif // PRODUCT | |
1384 | |
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1385 uint G1CollectorPolicy::max_regions(int purpose) { |
342 | 1386 switch (purpose) { |
1387 case GCAllocForSurvived: | |
545 | 1388 return _max_survivor_regions; |
342 | 1389 case GCAllocForTenured: |
545 | 1390 return REGIONS_UNLIMITED; |
342 | 1391 default: |
545 | 1392 ShouldNotReachHere(); |
1393 return REGIONS_UNLIMITED; | |
342 | 1394 }; |
1395 } | |
1396 | |
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1397 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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1398 uint expansion_region_num = 0; |
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1399 if (GCLockerEdenExpansionPercent > 0) { |
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1400 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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1401 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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1402 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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1403 // less than 1.0) we'll get 1. |
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1404 expansion_region_num = (uint) ceil(expansion_region_num_d); |
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1405 } else { |
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1406 assert(expansion_region_num == 0, "sanity"); |
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1407 } |
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1408 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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1409 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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1410 } |
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1411 |
545 | 1412 // Calculates survivor space parameters. |
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1413 void G1CollectorPolicy::update_survivors_policy() { |
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1414 double max_survivor_regions_d = |
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1415 (double) _young_list_target_length / (double) SurvivorRatio; |
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1416 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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1417 // smaller than 1.0) we'll get 1. |
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1418 _max_survivor_regions = (uint) ceil(max_survivor_regions_d); |
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1419 |
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1420 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 1421 HeapRegion::GrainWords * _max_survivor_regions); |
1422 } | |
1423 | |
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1424 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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1425 GCCause::Cause gc_cause) { |
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1426 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1427 if (!during_cycle) { |
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1428 ergo_verbose1(ErgoConcCycles, |
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1429 "request concurrent cycle initiation", |
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1430 ergo_format_reason("requested by GC cause") |
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1431 ergo_format_str("GC cause"), |
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1432 GCCause::to_string(gc_cause)); |
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1433 set_initiate_conc_mark_if_possible(); |
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1434 return true; |
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1435 } else { |
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1436 ergo_verbose1(ErgoConcCycles, |
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1437 "do not request concurrent cycle initiation", |
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1438 ergo_format_reason("concurrent cycle already in progress") |
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1439 ergo_format_str("GC cause"), |
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1440 GCCause::to_string(gc_cause)); |
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1441 return false; |
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1442 } |
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1443 } |
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1444 |
342 | 1445 void |
1359
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1446 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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1447 // We are about to decide on whether this pause will be an |
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1448 // initial-mark pause. |
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1449 |
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1450 // First, during_initial_mark_pause() should not be already set. We |
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1451 // will set it here if we have to. However, it should be cleared by |
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1452 // the end of the pause (it's only set for the duration of an |
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1453 // initial-mark pause). |
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1454 assert(!during_initial_mark_pause(), "pre-condition"); |
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1455 |
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1456 if (initiate_conc_mark_if_possible()) { |
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1457 // We had noticed on a previous pause that the heap occupancy has |
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1458 // gone over the initiating threshold and we should start a |
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1459 // concurrent marking cycle. So we might initiate one. |
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1460 |
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1461 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1462 if (!during_cycle) { |
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1463 // The concurrent marking thread is not "during a cycle", i.e., |
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1464 // it has completed the last one. So we can go ahead and |
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1465 // initiate a new cycle. |
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1466 |
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1467 set_during_initial_mark_pause(); |
4710 | 1468 // We do not allow mixed GCs during marking. |
1469 if (!gcs_are_young()) { | |
1470 set_gcs_are_young(true); | |
1471 ergo_verbose0(ErgoMixedGCs, | |
1472 "end mixed GCs", | |
3982
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1473 ergo_format_reason("concurrent cycle is about to start")); |
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1474 } |
1359
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1475 |
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1476 // And we can now clear initiate_conc_mark_if_possible() as |
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1477 // we've already acted on it. |
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1478 clear_initiate_conc_mark_if_possible(); |
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1479 |
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1480 ergo_verbose0(ErgoConcCycles, |
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1481 "initiate concurrent cycle", |
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1482 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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1483 } else { |
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1484 // The concurrent marking thread is still finishing up the |
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1485 // previous cycle. If we start one right now the two cycles |
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1486 // overlap. In particular, the concurrent marking thread might |
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1487 // be in the process of clearing the next marking bitmap (which |
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1488 // we will use for the next cycle if we start one). Starting a |
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1489 // cycle now will be bad given that parts of the marking |
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1490 // information might get cleared by the marking thread. And we |
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1491 // cannot wait for the marking thread to finish the cycle as it |
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1492 // periodically yields while clearing the next marking bitmap |
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1493 // and, if it's in a yield point, it's waiting for us to |
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1494 // finish. So, at this point we will not start a cycle and we'll |
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1495 // let the concurrent marking thread complete the last one. |
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1496 ergo_verbose0(ErgoConcCycles, |
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1497 "do not initiate concurrent cycle", |
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1498 ergo_format_reason("concurrent cycle already in progress")); |
1359
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1499 } |
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1500 } |
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1501 } |
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1502 |
342 | 1503 class KnownGarbageClosure: public HeapRegionClosure { |
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1504 G1CollectedHeap* _g1h; |
342 | 1505 CollectionSetChooser* _hrSorted; |
1506 | |
1507 public: | |
1508 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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1509 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 1510 |
1511 bool doHeapRegion(HeapRegion* r) { | |
1512 // We only include humongous regions in collection | |
1513 // sets when concurrent mark shows that their contained object is | |
1514 // unreachable. | |
1515 | |
1516 // Do we have any marking information for this region? | |
1517 if (r->is_marked()) { | |
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1518 // We will skip any region that's currently used as an old GC |
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1519 // alloc region (we should not consider those for collection |
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1520 // before we fill them up). |
6011 | 1521 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
1522 _hrSorted->add_region(r); | |
342 | 1523 } |
1524 } | |
1525 return false; | |
1526 } | |
1527 }; | |
1528 | |
1529 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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1530 G1CollectedHeap* _g1h; |
342 | 1531 CollectionSetChooser* _hrSorted; |
6011 | 1532 uint _marked_regions_added; |
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1533 size_t _reclaimable_bytes_added; |
6011 | 1534 uint _chunk_size; |
1535 uint _cur_chunk_idx; | |
1536 uint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
342 | 1537 |
1538 void get_new_chunk() { | |
6011 | 1539 _cur_chunk_idx = _hrSorted->claim_array_chunk(_chunk_size); |
342 | 1540 _cur_chunk_end = _cur_chunk_idx + _chunk_size; |
1541 } | |
1542 void add_region(HeapRegion* r) { | |
1543 if (_cur_chunk_idx == _cur_chunk_end) { | |
1544 get_new_chunk(); | |
1545 } | |
1546 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
6011 | 1547 _hrSorted->set_region(_cur_chunk_idx, r); |
342 | 1548 _marked_regions_added++; |
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1549 _reclaimable_bytes_added += r->reclaimable_bytes(); |
342 | 1550 _cur_chunk_idx++; |
1551 } | |
1552 | |
1553 public: | |
1554 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
6011 | 1555 uint chunk_size) : |
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1556 _g1h(G1CollectedHeap::heap()), |
6011 | 1557 _hrSorted(hrSorted), _chunk_size(chunk_size), |
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1558 _marked_regions_added(0), _reclaimable_bytes_added(0), |
6011 | 1559 _cur_chunk_idx(0), _cur_chunk_end(0) { } |
342 | 1560 |
1561 bool doHeapRegion(HeapRegion* r) { | |
1562 // Do we have any marking information for this region? | |
1563 if (r->is_marked()) { | |
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1564 // We will skip any region that's currently used as an old GC |
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1565 // alloc region (we should not consider those for collection |
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1566 // before we fill them up). |
6011 | 1567 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
342 | 1568 add_region(r); |
1569 } | |
1570 } | |
1571 return false; | |
1572 } | |
6011 | 1573 uint marked_regions_added() { return _marked_regions_added; } |
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1574 size_t reclaimable_bytes_added() { return _reclaimable_bytes_added; } |
342 | 1575 }; |
1576 | |
1577 class ParKnownGarbageTask: public AbstractGangTask { | |
1578 CollectionSetChooser* _hrSorted; | |
6011 | 1579 uint _chunk_size; |
342 | 1580 G1CollectedHeap* _g1; |
1581 public: | |
6011 | 1582 ParKnownGarbageTask(CollectionSetChooser* hrSorted, uint chunk_size) : |
342 | 1583 AbstractGangTask("ParKnownGarbageTask"), |
1584 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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1585 _g1(G1CollectedHeap::heap()) { } |
342 | 1586 |
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1587 void work(uint worker_id) { |
6011 | 1588 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size); |
1589 | |
342 | 1590 // Back to zero for the claim value. |
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1591 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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1592 _g1->workers()->active_workers(), |
355 | 1593 HeapRegion::InitialClaimValue); |
6011 | 1594 uint regions_added = parKnownGarbageCl.marked_regions_added(); |
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1595 size_t reclaimable_bytes_added = |
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1596 parKnownGarbageCl.reclaimable_bytes_added(); |
6011 | 1597 _hrSorted->update_totals(regions_added, reclaimable_bytes_added); |
342 | 1598 } |
1599 }; | |
1600 | |
1601 void | |
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1602 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
6011 | 1603 _collectionSetChooser->clear(); |
4013 | 1604 |
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1605 uint region_num = _g1->n_regions(); |
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1606 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1607 const uint OverpartitionFactor = 4; |
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1608 uint WorkUnit; |
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1609 // The use of MinChunkSize = 8 in the original code |
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1610 // causes some assertion failures when the total number of |
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1611 // region is less than 8. The code here tries to fix that. |
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1612 // Should the original code also be fixed? |
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1613 if (no_of_gc_threads > 0) { |
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1614 const uint MinWorkUnit = MAX2(region_num / no_of_gc_threads, 1U); |
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1615 WorkUnit = MAX2(region_num / (no_of_gc_threads * OverpartitionFactor), |
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1616 MinWorkUnit); |
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1617 } else { |
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1618 assert(no_of_gc_threads > 0, |
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1619 "The active gc workers should be greater than 0"); |
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1620 // In a product build do something reasonable to avoid a crash. |
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1621 const uint MinWorkUnit = MAX2(region_num / (uint) ParallelGCThreads, 1U); |
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1622 WorkUnit = |
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1623 MAX2(region_num / (uint) (ParallelGCThreads * OverpartitionFactor), |
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1624 MinWorkUnit); |
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1625 } |
6011 | 1626 _collectionSetChooser->prepare_for_par_region_addition(_g1->n_regions(), |
1627 WorkUnit); | |
342 | 1628 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
1571
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1629 (int) WorkUnit); |
342 | 1630 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 1631 |
1632 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
1633 "sanity check"); | |
342 | 1634 } else { |
1635 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
1636 _g1->heap_region_iterate(&knownGarbagecl); | |
1637 } | |
4013 | 1638 |
6011 | 1639 _collectionSetChooser->sort_regions(); |
1640 | |
4013 | 1641 double end_sec = os::elapsedTime(); |
1642 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; | |
1643 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1644 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1645 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1646 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 1647 } |
1648 | |
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1649 // Add the heap region at the head of the non-incremental collection set |
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1650 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
1394
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1651 assert(_inc_cset_build_state == Active, "Precondition"); |
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1652 assert(!hr->is_young(), "non-incremental add of young region"); |
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1653 |
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1654 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 1655 hr->set_in_collection_set(true); |
1656 hr->set_next_in_collection_set(_collection_set); | |
1657 _collection_set = hr; | |
1658 _collection_set_bytes_used_before += hr->used(); | |
526 | 1659 _g1->register_region_with_in_cset_fast_test(hr); |
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1660 size_t rs_length = hr->rem_set()->occupied(); |
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1661 _recorded_rs_lengths += rs_length; |
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1662 _old_cset_region_length += 1; |
342 | 1663 } |
1664 | |
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1665 // Initialize the per-collection-set information |
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1666 void G1CollectorPolicy::start_incremental_cset_building() { |
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1667 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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1668 |
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1669 _inc_cset_head = NULL; |
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1670 _inc_cset_tail = NULL; |
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1671 _inc_cset_bytes_used_before = 0; |
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1672 |
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1673 _inc_cset_max_finger = 0; |
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1674 _inc_cset_recorded_rs_lengths = 0; |
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1675 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1676 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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1677 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
1394
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1678 _inc_cset_build_state = Active; |
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1679 } |
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1680 |
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1681 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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1682 assert(_inc_cset_build_state == Active, "Precondition"); |
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1683 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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1684 |
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1685 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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1686 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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1687 // that adds a new region to the CSet. Further updates by the |
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1688 // concurrent refinement thread that samples the young RSet lengths |
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1689 // are accumulated in the *_diffs fields. Here we add the diffs to |
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1690 // the "main" fields. |
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1691 |
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1692 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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1693 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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1694 } else { |
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1695 // This is defensive. The diff should in theory be always positive |
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1696 // as RSets can only grow between GCs. However, given that we |
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1697 // sample their size concurrently with other threads updating them |
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1698 // it's possible that we might get the wrong size back, which |
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1699 // could make the calculations somewhat inaccurate. |
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1700 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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1701 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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1702 _inc_cset_recorded_rs_lengths -= diffs; |
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1703 } else { |
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1704 _inc_cset_recorded_rs_lengths = 0; |
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1705 } |
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1706 } |
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1707 _inc_cset_predicted_elapsed_time_ms += |
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1708 _inc_cset_predicted_elapsed_time_ms_diffs; |
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1709 |
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1710 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1711 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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1712 } |
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1713 |
1394
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1714 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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1715 // This routine is used when: |
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1716 // * adding survivor regions to the incremental cset at the end of an |
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1717 // evacuation pause, |
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1718 // * adding the current allocation region to the incremental cset |
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1719 // when it is retired, and |
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1720 // * updating existing policy information for a region in the |
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1721 // incremental cset via young list RSet sampling. |
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1722 // Therefore this routine may be called at a safepoint by the |
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1723 // VM thread, or in-between safepoints by mutator threads (when |
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|
1724 // retiring the current allocation region) or a concurrent |
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|
1725 // refine thread (RSet sampling). |
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|
1726 |
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|
1727 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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1728 size_t used_bytes = hr->used(); |
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1729 _inc_cset_recorded_rs_lengths += rs_length; |
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1730 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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1731 _inc_cset_bytes_used_before += used_bytes; |
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|
1732 |
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1733 // Cache the values we have added to the aggregated informtion |
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1734 // in the heap region in case we have to remove this region from |
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1735 // the incremental collection set, or it is updated by the |
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1736 // rset sampling code |
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1737 hr->set_recorded_rs_length(rs_length); |
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1738 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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|
1739 } |
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1740 |
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1741 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
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1742 size_t new_rs_length) { |
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1743 // Update the CSet information that is dependent on the new RS length |
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1744 assert(hr->is_young(), "Precondition"); |
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1745 assert(!SafepointSynchronize::is_at_safepoint(), |
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1746 "should not be at a safepoint"); |
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1747 |
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1748 // We could have updated _inc_cset_recorded_rs_lengths and |
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1749 // _inc_cset_predicted_elapsed_time_ms directly but we'd need to do |
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1750 // that atomically, as this code is executed by a concurrent |
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1751 // refinement thread, potentially concurrently with a mutator thread |
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1752 // allocating a new region and also updating the same fields. To |
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1753 // avoid the atomic operations we accumulate these updates on two |
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1754 // separate fields (*_diffs) and we'll just add them to the "main" |
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1755 // fields at the start of a GC. |
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1756 |
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1757 ssize_t old_rs_length = (ssize_t) hr->recorded_rs_length(); |
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1758 ssize_t rs_lengths_diff = (ssize_t) new_rs_length - old_rs_length; |
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1759 _inc_cset_recorded_rs_lengths_diffs += rs_lengths_diff; |
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|
1760 |
1394
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|
1761 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
1762 double new_region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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1763 double elapsed_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms; |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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1764 _inc_cset_predicted_elapsed_time_ms_diffs += elapsed_ms_diff; |
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|
1765 |
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1766 hr->set_recorded_rs_length(new_rs_length); |
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|
1767 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
1394
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|
1768 } |
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|
1769 |
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|
1770 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
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|
1771 assert(hr->is_young(), "invariant"); |
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|
1772 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
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|
1773 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
1774 |
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|
1775 // We need to clear and set the cached recorded/cached collection set |
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|
1776 // information in the heap region here (before the region gets added |
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|
1777 // to the collection set). An individual heap region's cached values |
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|
1778 // are calculated, aggregated with the policy collection set info, |
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|
1779 // and cached in the heap region here (initially) and (subsequently) |
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|
1780 // by the Young List sampling code. |
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|
1781 |
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|
1782 size_t rs_length = hr->rem_set()->occupied(); |
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|
1783 add_to_incremental_cset_info(hr, rs_length); |
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|
1784 |
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|
1785 HeapWord* hr_end = hr->end(); |
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|
1786 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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|
1787 |
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|
1788 assert(!hr->in_collection_set(), "invariant"); |
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|
1789 hr->set_in_collection_set(true); |
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|
1790 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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|
1791 |
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diff
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|
1792 _g1->register_region_with_in_cset_fast_test(hr); |
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|
1793 } |
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diff
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|
1794 |
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diff
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|
1795 // Add the region at the RHS of the incremental cset |
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|
1796 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1797 // We should only ever be appending survivors at the end of a pause |
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|
1798 assert( hr->is_survivor(), "Logic"); |
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diff
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|
1799 |
1316cec51b4d
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diff
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|
1800 // Do the 'common' stuff |
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diff
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|
1801 add_region_to_incremental_cset_common(hr); |
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|
1802 |
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|
1803 // Now add the region at the right hand side |
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|
1804 if (_inc_cset_tail == NULL) { |
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|
1805 assert(_inc_cset_head == NULL, "invariant"); |
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|
1806 _inc_cset_head = hr; |
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|
1807 } else { |
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|
1808 _inc_cset_tail->set_next_in_collection_set(hr); |
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|
1809 } |
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|
1810 _inc_cset_tail = hr; |
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|
1811 } |
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|
1812 |
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|
1813 // Add the region to the LHS of the incremental cset |
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|
1814 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
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|
1815 // Survivors should be added to the RHS at the end of a pause |
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|
1816 assert(!hr->is_survivor(), "Logic"); |
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|
1817 |
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|
1818 // Do the 'common' stuff |
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|
1819 add_region_to_incremental_cset_common(hr); |
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|
1820 |
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diff
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|
1821 // Add the region at the left hand side |
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|
1822 hr->set_next_in_collection_set(_inc_cset_head); |
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|
1823 if (_inc_cset_head == NULL) { |
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|
1824 assert(_inc_cset_tail == NULL, "Invariant"); |
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|
1825 _inc_cset_tail = hr; |
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|
1826 } |
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|
1827 _inc_cset_head = hr; |
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|
1828 } |
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diff
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|
1829 |
1316cec51b4d
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parents:
1391
diff
changeset
|
1830 #ifndef PRODUCT |
1316cec51b4d
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parents:
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diff
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|
1831 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
1316cec51b4d
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diff
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|
1832 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
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|
1833 |
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diff
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|
1834 st->print_cr("\nCollection_set:"); |
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|
1835 HeapRegion* csr = list_head; |
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|
1836 while (csr != NULL) { |
1316cec51b4d
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diff
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|
1837 HeapRegion* next = csr->next_in_collection_set(); |
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|
1838 assert(csr->in_collection_set(), "bad CS"); |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
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|
1839 st->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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6011
diff
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|
1840 HR_FORMAT_PARAMS(csr), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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6011
diff
changeset
|
1841 csr->prev_top_at_mark_start(), csr->next_top_at_mark_start(), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
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6011
diff
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|
1842 csr->age_in_surv_rate_group_cond()); |
1394
1316cec51b4d
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diff
changeset
|
1843 csr = next; |
1316cec51b4d
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diff
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|
1844 } |
1316cec51b4d
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diff
changeset
|
1845 } |
1316cec51b4d
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diff
changeset
|
1846 #endif // !PRODUCT |
1316cec51b4d
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|
1847 |
4912
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|
1848 bool G1CollectorPolicy::next_gc_should_be_mixed(const char* true_action_str, |
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|
1849 const char* false_action_str) { |
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|
1850 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1851 if (cset_chooser->is_empty()) { |
4912
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|
1852 ergo_verbose0(ErgoMixedGCs, |
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|
1853 false_action_str, |
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|
1854 ergo_format_reason("candidate old regions not available")); |
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|
1855 return false; |
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|
1856 } |
6011 | 1857 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
4912
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|
1858 size_t capacity_bytes = _g1->capacity(); |
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|
1859 double perc = (double) reclaimable_bytes * 100.0 / (double) capacity_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
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|
1860 double threshold = (double) G1HeapWastePercent; |
4912
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|
1861 if (perc < threshold) { |
a9647476d1a4
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|
1862 ergo_verbose4(ErgoMixedGCs, |
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changeset
|
1863 false_action_str, |
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|
1864 ergo_format_reason("reclaimable percentage lower than threshold") |
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|
1865 ergo_format_region("candidate old regions") |
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|
1866 ergo_format_byte_perc("reclaimable") |
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|
1867 ergo_format_perc("threshold"), |
6011 | 1868 cset_chooser->remaining_regions(), |
4912
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|
1869 reclaimable_bytes, perc, threshold); |
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|
1870 return false; |
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|
1871 } |
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|
1872 |
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changeset
|
1873 ergo_verbose4(ErgoMixedGCs, |
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|
1874 true_action_str, |
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changeset
|
1875 ergo_format_reason("candidate old regions available") |
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|
1876 ergo_format_region("candidate old regions") |
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|
1877 ergo_format_byte_perc("reclaimable") |
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|
1878 ergo_format_perc("threshold"), |
6011 | 1879 cset_chooser->remaining_regions(), |
4912
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changeset
|
1880 reclaimable_bytes, perc, threshold); |
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1881 return true; |
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1882 } |
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1883 |
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1884 void G1CollectorPolicy::finalize_cset(double target_pause_time_ms) { |
1394
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1885 // Set this here - in case we're not doing young collections. |
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1886 double non_young_start_time_sec = os::elapsedTime(); |
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1887 |
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1888 YoungList* young_list = _g1->young_list(); |
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1889 finalize_incremental_cset_building(); |
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1890 |
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1891 guarantee(target_pause_time_ms > 0.0, |
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1892 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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1893 target_pause_time_ms)); |
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1894 guarantee(_collection_set == NULL, "Precondition"); |
342 | 1895 |
1896 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
1897 double predicted_pause_time_ms = base_time_ms; | |
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1898 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 1899 |
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1900 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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1901 "start choosing CSet", |
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1902 ergo_format_ms("predicted base time") |
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1903 ergo_format_ms("remaining time") |
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1904 ergo_format_ms("target pause time"), |
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1905 base_time_ms, time_remaining_ms, target_pause_time_ms); |
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1906 |
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1907 HeapRegion* hr; |
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1908 double young_start_time_sec = os::elapsedTime(); |
342 | 1909 |
677 | 1910 _collection_set_bytes_used_before = 0; |
4710 | 1911 _last_gc_was_young = gcs_are_young() ? true : false; |
1912 | |
1913 if (_last_gc_was_young) { | |
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1914 _trace_gen0_time_data.increment_young_collection_count(); |
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1915 } else { |
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1916 _trace_gen0_time_data.increment_mixed_collection_count(); |
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1917 } |
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1918 |
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1919 // The young list is laid with the survivor regions from the previous |
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1920 // pause are appended to the RHS of the young list, i.e. |
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1921 // [Newly Young Regions ++ Survivors from last pause]. |
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1922 |
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1923 uint survivor_region_length = young_list->survivor_length(); |
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1924 uint eden_region_length = young_list->length() - survivor_region_length; |
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1925 init_cset_region_lengths(eden_region_length, survivor_region_length); |
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1926 hr = young_list->first_survivor_region(); |
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1927 while (hr != NULL) { |
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1928 assert(hr->is_survivor(), "badly formed young list"); |
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1929 hr->set_young(); |
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1930 hr = hr->get_next_young_region(); |
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1931 } |
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1932 |
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1933 // Clear the fields that point to the survivor list - they are all young now. |
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1934 young_list->clear_survivors(); |
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1935 |
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1936 _collection_set = _inc_cset_head; |
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1937 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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1938 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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1939 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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1940 |
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1941 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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1942 "add young regions to CSet", |
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1943 ergo_format_region("eden") |
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1944 ergo_format_region("survivors") |
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1945 ergo_format_ms("predicted young region time"), |
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1946 eden_region_length, survivor_region_length, |
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1947 _inc_cset_predicted_elapsed_time_ms); |
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1948 |
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1949 // The number of recorded young regions is the incremental |
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1950 // collection set's current size |
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1951 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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1952 |
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1953 double young_end_time_sec = os::elapsedTime(); |
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1954 phase_times()->_recorded_young_cset_choice_time_ms = |
3867
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1955 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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1956 |
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1957 // We are doing young collections so reset this. |
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1958 non_young_start_time_sec = young_end_time_sec; |
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1959 |
4710 | 1960 if (!gcs_are_young()) { |
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1961 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1962 cset_chooser->verify(); |
1963 const uint min_old_cset_length = cset_chooser->calc_min_old_cset_length(); | |
1964 const uint max_old_cset_length = cset_chooser->calc_max_old_cset_length(); | |
6010
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1965 |
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1966 uint expensive_region_num = 0; |
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1967 bool check_time_remaining = adaptive_young_list_length(); |
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1968 HeapRegion* hr = cset_chooser->peek(); |
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1969 while (hr != NULL) { |
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1970 if (old_cset_region_length() >= max_old_cset_length) { |
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1971 // Added maximum number of old regions to the CSet. |
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1972 ergo_verbose2(ErgoCSetConstruction, |
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1973 "finish adding old regions to CSet", |
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1974 ergo_format_reason("old CSet region num reached max") |
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1975 ergo_format_region("old") |
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1976 ergo_format_region("max"), |
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1977 old_cset_region_length(), max_old_cset_length); |
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1978 break; |
342 | 1979 } |
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1980 |
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1981 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
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1982 if (check_time_remaining) { |
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1983 if (predicted_time_ms > time_remaining_ms) { |
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1984 // Too expensive for the current CSet. |
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1985 |
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1986 if (old_cset_region_length() >= min_old_cset_length) { |
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1987 // We have added the minimum number of old regions to the CSet, |
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1988 // we are done with this CSet. |
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1989 ergo_verbose4(ErgoCSetConstruction, |
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1990 "finish adding old regions to CSet", |
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1991 ergo_format_reason("predicted time is too high") |
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1992 ergo_format_ms("predicted time") |
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1993 ergo_format_ms("remaining time") |
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1994 ergo_format_region("old") |
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1995 ergo_format_region("min"), |
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1996 predicted_time_ms, time_remaining_ms, |
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1997 old_cset_region_length(), min_old_cset_length); |
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1998 break; |
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1999 } |
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2000 |
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2001 // We'll add it anyway given that we haven't reached the |
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2002 // minimum number of old regions. |
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2003 expensive_region_num += 1; |
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2004 } |
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2005 } else { |
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2006 if (old_cset_region_length() >= min_old_cset_length) { |
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2007 // In the non-auto-tuning case, we'll finish adding regions |
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2008 // to the CSet if we reach the minimum. |
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2009 ergo_verbose2(ErgoCSetConstruction, |
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2010 "finish adding old regions to CSet", |
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2011 ergo_format_reason("old CSet region num reached min") |
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2012 ergo_format_region("old") |
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|
2013 ergo_format_region("min"), |
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2014 old_cset_region_length(), min_old_cset_length); |
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2015 break; |
3914
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2016 } |
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|
2017 } |
4912
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2018 |
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2019 // We will add this region to the CSet. |
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2020 time_remaining_ms -= predicted_time_ms; |
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2021 predicted_pause_time_ms += predicted_time_ms; |
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2022 cset_chooser->remove_and_move_to_next(hr); |
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2023 _g1->old_set_remove(hr); |
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2024 add_old_region_to_cset(hr); |
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2025 |
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2026 hr = cset_chooser->peek(); |
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|
2027 } |
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2028 if (hr == NULL) { |
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2029 ergo_verbose0(ErgoCSetConstruction, |
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|
2030 "finish adding old regions to CSet", |
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|
2031 ergo_format_reason("candidate old regions not available")); |
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2032 } |
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|
2033 |
4912
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2034 if (expensive_region_num > 0) { |
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2035 // We print the information once here at the end, predicated on |
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2036 // whether we added any apparently expensive regions or not, to |
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2037 // avoid generating output per region. |
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2038 ergo_verbose4(ErgoCSetConstruction, |
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|
2039 "added expensive regions to CSet", |
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|
2040 ergo_format_reason("old CSet region num not reached min") |
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|
2041 ergo_format_region("old") |
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|
2042 ergo_format_region("expensive") |
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|
2043 ergo_format_region("min") |
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|
2044 ergo_format_ms("remaining time"), |
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|
2045 old_cset_region_length(), |
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|
2046 expensive_region_num, |
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|
2047 min_old_cset_length, |
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|
2048 time_remaining_ms); |
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|
2049 } |
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|
2050 |
6011 | 2051 cset_chooser->verify(); |
342 | 2052 } |
2053 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
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|
2054 stop_incremental_cset_building(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
2055 |
342 | 2056 count_CS_bytes_used(); |
2057 | |
3914
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|
2058 ergo_verbose5(ErgoCSetConstruction, |
20213c8a3c40
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|
2059 "finish choosing CSet", |
20213c8a3c40
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|
2060 ergo_format_region("eden") |
20213c8a3c40
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|
2061 ergo_format_region("survivors") |
20213c8a3c40
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|
2062 ergo_format_region("old") |
20213c8a3c40
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|
2063 ergo_format_ms("predicted pause time") |
20213c8a3c40
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|
2064 ergo_format_ms("target pause time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4072
diff
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|
2065 eden_region_length, survivor_region_length, |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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4072
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|
2066 old_cset_region_length(), |
3914
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2067 predicted_pause_time_ms, target_pause_time_ms); |
20213c8a3c40
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|
2068 |
342 | 2069 double non_young_end_time_sec = os::elapsedTime(); |
6219
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|
2070 phase_times()->_recorded_non_young_cset_choice_time_ms = |
342 | 2071 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; |
2072 } | |
6109
bbc900c2482a
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|
2073 |
bbc900c2482a
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|
2074 void TraceGen0TimeData::record_start_collection(double time_to_stop_the_world_ms) { |
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|
2075 if(TraceGen0Time) { |
bbc900c2482a
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|
2076 _all_stop_world_times_ms.add(time_to_stop_the_world_ms); |
bbc900c2482a
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|
2077 } |
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|
2078 } |
bbc900c2482a
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|
2079 |
bbc900c2482a
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|
2080 void TraceGen0TimeData::record_yield_time(double yield_time_ms) { |
bbc900c2482a
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|
2081 if(TraceGen0Time) { |
bbc900c2482a
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|
2082 _all_yield_times_ms.add(yield_time_ms); |
bbc900c2482a
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|
2083 } |
bbc900c2482a
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|
2084 } |
bbc900c2482a
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|
2085 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2086 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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|
2087 if(TraceGen0Time) { |
6219
922993931b3d
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|
2088 _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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|
2089 _other.add(pause_time_ms - phase_times->accounted_time_ms()); |
922993931b3d
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|
2090 _root_region_scan_wait.add(phase_times->_root_region_scan_wait_time_ms); |
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|
2091 _parallel.add(phase_times->_cur_collection_par_time_ms); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2092 _ext_root_scan.add(phase_times->_ext_root_scan_time); |
922993931b3d
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brutisso
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|
2093 _satb_filtering.add(phase_times->_satb_filtering_time); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
2094 _update_rs.add(phase_times->_update_rs_time); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
2095 _scan_rs.add(phase_times->_scan_rs_time); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2096 _obj_copy.add(phase_times->_obj_copy_time); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
2097 _termination.add(phase_times->_termination_time); |
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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|
2098 |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
diff
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|
2099 double parallel_known_time = phase_times->_ext_root_scan_time + |
922993931b3d
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brutisso
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6109
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|
2100 phase_times->_satb_filtering_time + |
922993931b3d
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brutisso
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6109
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|
2101 phase_times->_update_rs_time + |
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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|
2102 phase_times->_scan_rs_time + |
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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|
2103 phase_times->_obj_copy_time + |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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6109
diff
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|
2104 + phase_times->_termination_time; |
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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|
2105 |
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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|
2106 double parallel_other_time = phase_times->_cur_collection_par_time_ms - parallel_known_time; |
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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|
2107 _parallel_other.add(parallel_other_time); |
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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|
2108 _clear_ct.add(phase_times->_cur_clear_ct_time_ms); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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diff
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|
2109 } |
bbc900c2482a
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brutisso
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6064
diff
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|
2110 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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parents:
6064
diff
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|
2111 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2112 void TraceGen0TimeData::increment_young_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2113 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2114 ++_young_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2115 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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6064
diff
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|
2116 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2117 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2118 void TraceGen0TimeData::increment_mixed_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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6064
diff
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|
2119 if(TraceGen0Time) { |
bbc900c2482a
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brutisso
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|
2120 ++_mixed_pause_num; |
bbc900c2482a
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brutisso
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6064
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|
2121 } |
bbc900c2482a
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|
2122 } |
bbc900c2482a
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brutisso
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6064
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changeset
|
2123 |
6219
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|
2124 void TraceGen0TimeData::print_summary(const char* str, |
6109
bbc900c2482a
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|
2125 const NumberSeq* seq) const { |
bbc900c2482a
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brutisso
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|
2126 double sum = seq->sum(); |
6219
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brutisso
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6109
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|
2127 gclog_or_tty->print_cr("%-27s = %8.2lf s (avg = %8.2lf ms)", |
6109
bbc900c2482a
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brutisso
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|
2128 str, sum / 1000.0, seq->avg()); |
bbc900c2482a
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brutisso
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6064
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|
2129 } |
bbc900c2482a
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brutisso
parents:
6064
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changeset
|
2130 |
6219
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brutisso
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6109
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|
2131 void TraceGen0TimeData::print_summary_sd(const char* str, |
6109
bbc900c2482a
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|
2132 const NumberSeq* seq) const { |
6219
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brutisso
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6109
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|
2133 print_summary(str, seq); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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6109
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|
2134 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
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|
2135 "(num", seq->num(), seq->sd(), seq->maximum()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2136 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2137 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2138 void TraceGen0TimeData::print() const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2139 if (!TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2140 return; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2141 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2142 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2143 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
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|
2144 print_summary_sd(" Total", &_total); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2145 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2146 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2147 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2148 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2149 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2150 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2151 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2152 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
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|
2153 if (_young_pause_num == 0 && _mixed_pause_num == 0) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
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|
2154 gclog_or_tty->print_cr("none"); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2155 } else { |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
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|
2156 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
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|
2157 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
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|
2158 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
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|
2159 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
|
2160 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
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|
2161 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
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|
2162 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
|
2163 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
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|
2164 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
|
2165 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
|
2166 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
|
2167 print_summary(" Other", &_other); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2168 } |
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 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2171 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
|
2172 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
|
2173 print_summary_sd(" Yields", &_all_yield_times_ms); |
6109
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 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2176 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
|
2177 if (TraceGen1Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
diff
changeset
|
2178 _all_full_gc_times.add(full_gc_time_ms); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2179 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2180 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2181 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2182 void TraceGen1TimeData::print() const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2183 if (!TraceGen1Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2184 return; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2185 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2186 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2187 if (_all_full_gc_times.num() > 0) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2188 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2189 _all_full_gc_times.num(), |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2190 _all_full_gc_times.sum() / 1000.0); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2191 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times.avg()); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2192 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
parents:
6064
diff
changeset
|
2193 _all_full_gc_times.sd(), |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2194 _all_full_gc_times.maximum()); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2195 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2196 } |