Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 12178:84683e78e713
8019902: G1: Use the average heap size rather than the minimum heap size to calculate the region size
Reviewed-by: tonyp, tschatzl, sjohanss
author | brutisso |
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date | Fri, 30 Aug 2013 07:31:47 +0200 |
parents | 4c84d351cca9 |
children | 9b4d0569f2f4 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
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33 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 34 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
35 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
36 #include "runtime/arguments.hpp" | |
37 #include "runtime/java.hpp" | |
38 #include "runtime/mutexLocker.hpp" | |
39 #include "utilities/debug.hpp" | |
342 | 40 |
41 // Different defaults for different number of GC threads | |
42 // They were chosen by running GCOld and SPECjbb on debris with different | |
43 // numbers of GC threads and choosing them based on the results | |
44 | |
45 // all the same | |
46 static double rs_length_diff_defaults[] = { | |
47 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
48 }; | |
49 | |
50 static double cost_per_card_ms_defaults[] = { | |
51 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
52 }; | |
53 | |
54 // all the same | |
4710 | 55 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 56 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
57 }; | |
58 | |
59 static double cost_per_entry_ms_defaults[] = { | |
60 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
61 }; | |
62 | |
63 static double cost_per_byte_ms_defaults[] = { | |
64 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
65 }; | |
66 | |
67 // these should be pretty consistent | |
68 static double constant_other_time_ms_defaults[] = { | |
69 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
70 }; | |
71 | |
72 | |
73 static double young_other_cost_per_region_ms_defaults[] = { | |
74 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
75 }; | |
76 | |
77 static double non_young_other_cost_per_region_ms_defaults[] = { | |
78 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
79 }; | |
80 | |
81 G1CollectorPolicy::G1CollectorPolicy() : | |
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82 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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83 ? ParallelGCThreads : 1), |
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84 |
342 | 85 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
86 _stop_world_start(0.0), | |
87 | |
88 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
89 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
90 | |
91 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
92 _prev_collection_pause_end_ms(0.0), | |
93 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
94 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 95 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
96 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 97 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 98 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 99 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
100 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
101 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
102 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
103 _non_young_other_cost_per_region_ms_seq( | |
104 new TruncatedSeq(TruncatedSeqLength)), | |
105 | |
106 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
107 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
108 | |
751 | 109 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 110 |
4710 | 111 _gcs_are_young(true), |
342 | 112 |
113 _during_marking(false), | |
114 _in_marking_window(false), | |
115 _in_marking_window_im(false), | |
116 | |
4710 | 117 _recent_prev_end_times_for_all_gcs_sec( |
118 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 119 |
120 _recent_avg_pause_time_ratio(0.0), | |
121 | |
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122 _initiate_conc_mark_if_possible(false), |
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123 _during_initial_mark_pause(false), |
4710 | 124 _last_young_gc(false), |
125 _last_gc_was_young(false), | |
342 | 126 |
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127 _eden_used_bytes_before_gc(0), |
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128 _survivor_used_bytes_before_gc(0), |
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129 _heap_used_bytes_before_gc(0), |
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130 _metaspace_used_bytes_before_gc(0), |
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131 _eden_capacity_bytes_before_gc(0), |
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132 _heap_capacity_bytes_before_gc(0), |
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133 |
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134 _eden_cset_region_length(0), |
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135 _survivor_cset_region_length(0), |
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136 _old_cset_region_length(0), |
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137 |
342 | 138 _collection_set(NULL), |
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139 _collection_set_bytes_used_before(0), |
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140 |
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141 // Incremental CSet attributes |
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142 _inc_cset_build_state(Inactive), |
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143 _inc_cset_head(NULL), |
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144 _inc_cset_tail(NULL), |
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145 _inc_cset_bytes_used_before(0), |
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146 _inc_cset_max_finger(NULL), |
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147 _inc_cset_recorded_rs_lengths(0), |
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148 _inc_cset_recorded_rs_lengths_diffs(0), |
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149 _inc_cset_predicted_elapsed_time_ms(0.0), |
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150 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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151 |
342 | 152 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
153 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
154 #endif // _MSC_VER | |
155 | |
156 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
157 G1YoungSurvRateNumRegionsSummary)), | |
158 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 159 G1YoungSurvRateNumRegionsSummary)), |
342 | 160 // add here any more surv rate groups |
545 | 161 _recorded_survivor_regions(0), |
162 _recorded_survivor_head(NULL), | |
163 _recorded_survivor_tail(NULL), | |
1356 | 164 _survivors_age_table(true), |
165 | |
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166 _gc_overhead_perc(0.0) { |
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167 |
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168 // Set up the region size and associated fields. Given that the |
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169 // policy is created before the heap, we have to set this up here, |
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170 // so it's done as soon as possible. |
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171 |
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172 // It would have been natural to pass initial_heap_byte_size() and |
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173 // max_heap_byte_size() to setup_heap_region_size() but those have |
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174 // not been set up at this point since they should be aligned with |
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175 // the region size. So, there is a circular dependency here. We base |
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176 // the region size on the heap size, but the heap size should be |
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177 // aligned with the region size. To get around this we use the |
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178 // unaligned values for the heap. |
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179 HeapRegion::setup_heap_region_size(InitialHeapSize, MaxHeapSize); |
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180 HeapRegionRemSet::setup_remset_size(); |
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181 |
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182 G1ErgoVerbose::initialize(); |
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183 if (PrintAdaptiveSizePolicy) { |
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184 // Currently, we only use a single switch for all the heuristics. |
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185 G1ErgoVerbose::set_enabled(true); |
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186 // Given that we don't currently have a verboseness level |
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187 // parameter, we'll hardcode this to high. This can be easily |
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188 // changed in the future. |
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189 G1ErgoVerbose::set_level(ErgoHigh); |
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190 } else { |
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191 G1ErgoVerbose::set_enabled(false); |
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192 } |
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193 |
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194 // Verify PLAB sizes |
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195 const size_t region_size = HeapRegion::GrainWords; |
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196 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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197 char buffer[128]; |
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198 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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199 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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200 vm_exit_during_initialization(buffer); |
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201 } |
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202 |
342 | 203 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
204 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
205 | |
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206 _phase_times = new G1GCPhaseTimes(_parallel_gc_threads); |
342 | 207 |
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208 int index = MIN2(_parallel_gc_threads - 1, 7); |
342 | 209 |
210 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
211 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 212 _young_cards_per_entry_ratio_seq->add( |
213 young_cards_per_entry_ratio_defaults[index]); | |
342 | 214 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
215 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
216 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
217 _young_other_cost_per_region_ms_seq->add( | |
218 young_other_cost_per_region_ms_defaults[index]); | |
219 _non_young_other_cost_per_region_ms_seq->add( | |
220 non_young_other_cost_per_region_ms_defaults[index]); | |
221 | |
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222 // Below, we might need to calculate the pause time target based on |
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223 // the pause interval. When we do so we are going to give G1 maximum |
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224 // flexibility and allow it to do pauses when it needs to. So, we'll |
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225 // arrange that the pause interval to be pause time target + 1 to |
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226 // ensure that a) the pause time target is maximized with respect to |
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227 // the pause interval and b) we maintain the invariant that pause |
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228 // time target < pause interval. If the user does not want this |
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229 // maximum flexibility, they will have to set the pause interval |
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230 // explicitly. |
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231 |
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232 // First make sure that, if either parameter is set, its value is |
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233 // reasonable. |
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234 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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235 if (MaxGCPauseMillis < 1) { |
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236 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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237 "greater than 0"); |
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238 } |
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239 } |
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240 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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241 if (GCPauseIntervalMillis < 1) { |
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242 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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243 "greater than 0"); |
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244 } |
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245 } |
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246 |
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247 // Then, if the pause time target parameter was not set, set it to |
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248 // the default value. |
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249 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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250 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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251 // The default pause time target in G1 is 200ms |
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252 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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253 } else { |
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254 // We do not allow the pause interval to be set without the |
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255 // pause time target |
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256 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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257 "without setting MaxGCPauseMillis"); |
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258 } |
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259 } |
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260 |
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261 // Then, if the interval parameter was not set, set it according to |
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262 // the pause time target (this will also deal with the case when the |
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263 // pause time target is the default value). |
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264 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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265 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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266 } |
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267 |
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268 // Finally, make sure that the two parameters are consistent. |
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269 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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270 char buffer[256]; |
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271 jio_snprintf(buffer, 256, |
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272 "MaxGCPauseMillis (%u) should be less than " |
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273 "GCPauseIntervalMillis (%u)", |
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274 MaxGCPauseMillis, GCPauseIntervalMillis); |
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275 vm_exit_during_initialization(buffer); |
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276 } |
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277 |
751 | 278 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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279 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 280 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
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281 |
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282 uintx confidence_perc = G1ConfidencePercent; |
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283 // Put an artificial ceiling on this so that it's not set to a silly value. |
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284 if (confidence_perc > 100) { |
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285 confidence_perc = 100; |
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286 warning("G1ConfidencePercent is set to a value that is too large, " |
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287 "it's been updated to %u", confidence_perc); |
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288 } |
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289 _sigma = (double) confidence_perc / 100.0; |
342 | 290 |
291 // start conservatively (around 50ms is about right) | |
292 _concurrent_mark_remark_times_ms->add(0.05); | |
293 _concurrent_mark_cleanup_times_ms->add(0.20); | |
294 _tenuring_threshold = MaxTenuringThreshold; | |
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295 // _max_survivor_regions will be calculated by |
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296 // update_young_list_target_length() during initialization. |
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297 _max_survivor_regions = 0; |
545 | 298 |
1356 | 299 assert(GCTimeRatio > 0, |
300 "we should have set it to a default value set_g1_gc_flags() " | |
301 "if a user set it to 0"); | |
302 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
303 | |
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304 uintx reserve_perc = G1ReservePercent; |
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305 // Put an artificial ceiling on this so that it's not set to a silly value. |
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306 if (reserve_perc > 50) { |
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307 reserve_perc = 50; |
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308 warning("G1ReservePercent is set to a value that is too large, " |
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309 "it's been updated to %u", reserve_perc); |
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310 } |
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311 _reserve_factor = (double) reserve_perc / 100.0; |
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312 // This will be set when the heap is expanded |
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313 // for the first time during initialization. |
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314 _reserve_regions = 0; |
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315 |
342 | 316 initialize_all(); |
4013 | 317 _collectionSetChooser = new CollectionSetChooser(); |
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318 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 319 } |
320 | |
321 void G1CollectorPolicy::initialize_flags() { | |
322 set_min_alignment(HeapRegion::GrainBytes); | |
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323 size_t card_table_alignment = GenRemSet::max_alignment_constraint(rem_set_name()); |
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324 size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size(); |
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325 set_max_alignment(MAX3(card_table_alignment, min_alignment(), page_size)); |
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326 if (SurvivorRatio < 1) { |
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327 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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328 } |
342 | 329 CollectorPolicy::initialize_flags(); |
330 } | |
331 | |
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332 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
7449 | 333 assert(G1NewSizePercent <= G1MaxNewSizePercent, "Min larger than max"); |
334 assert(G1NewSizePercent > 0 && G1NewSizePercent < 100, "Min out of bounds"); | |
335 assert(G1MaxNewSizePercent > 0 && G1MaxNewSizePercent < 100, "Max out of bounds"); | |
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336 |
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337 if (FLAG_IS_CMDLINE(NewRatio)) { |
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338 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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339 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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340 } else { |
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341 _sizer_kind = SizerNewRatio; |
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342 _adaptive_size = false; |
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343 return; |
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344 } |
3976 | 345 } |
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346 |
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347 if (FLAG_IS_CMDLINE(NewSize)) { |
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348 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), |
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349 1U); |
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350 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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351 _max_desired_young_length = |
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352 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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353 1U); |
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354 _sizer_kind = SizerMaxAndNewSize; |
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355 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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356 } else { |
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357 _sizer_kind = SizerNewSizeOnly; |
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358 } |
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359 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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360 _max_desired_young_length = |
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361 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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362 1U); |
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363 _sizer_kind = SizerMaxNewSizeOnly; |
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364 } |
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365 } |
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366 |
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367 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { |
7449 | 368 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100; |
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369 return MAX2(1U, default_value); |
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370 } |
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371 |
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372 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { |
7449 | 373 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100; |
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374 return MAX2(1U, default_value); |
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375 } |
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376 |
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377 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { |
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378 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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379 |
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380 switch (_sizer_kind) { |
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381 case SizerDefaults: |
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382 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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383 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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384 break; |
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385 case SizerNewSizeOnly: |
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386 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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387 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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388 break; |
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389 case SizerMaxNewSizeOnly: |
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390 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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391 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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392 break; |
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393 case SizerMaxAndNewSize: |
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394 // Do nothing. Values set on the command line, don't update them at runtime. |
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395 break; |
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396 case SizerNewRatio: |
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397 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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398 _max_desired_young_length = _min_desired_young_length; |
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399 break; |
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400 default: |
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401 ShouldNotReachHere(); |
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402 } |
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403 |
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404 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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405 } |
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406 |
342 | 407 void G1CollectorPolicy::init() { |
408 // Set aside an initial future to_space. | |
409 _g1 = G1CollectedHeap::heap(); | |
410 | |
411 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
412 | |
545 | 413 initialize_gc_policy_counters(); |
414 | |
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415 if (adaptive_young_list_length()) { |
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416 _young_list_fixed_length = 0; |
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417 } else { |
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418 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 419 } |
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420 _free_regions_at_end_of_collection = _g1->free_regions(); |
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421 update_young_list_target_length(); |
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422 |
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423 // We may immediately start allocating regions and placing them on the |
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424 // collection set list. Initialize the per-collection set info |
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425 start_incremental_cset_building(); |
342 | 426 } |
427 | |
545 | 428 // Create the jstat counters for the policy. |
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429 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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430 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 431 } |
432 | |
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433 bool G1CollectorPolicy::predict_will_fit(uint young_length, |
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434 double base_time_ms, |
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435 uint base_free_regions, |
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436 double target_pause_time_ms) { |
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437 if (young_length >= base_free_regions) { |
342 | 438 // end condition 1: not enough space for the young regions |
439 return false; | |
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440 } |
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441 |
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442 double accum_surv_rate = accum_yg_surv_rate_pred((int) young_length - 1); |
342 | 443 size_t bytes_to_copy = |
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444 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 445 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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446 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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447 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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448 if (pause_time_ms > target_pause_time_ms) { |
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449 // end condition 2: prediction is over the target pause time |
342 | 450 return false; |
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451 } |
342 | 452 |
453 size_t free_bytes = | |
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454 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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455 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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456 // end condition 3: out-of-space (conservatively!) |
342 | 457 return false; |
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458 } |
342 | 459 |
460 // success! | |
461 return true; | |
462 } | |
463 | |
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464 void G1CollectorPolicy::record_new_heap_size(uint new_number_of_regions) { |
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465 // re-calculate the necessary reserve |
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466 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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467 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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468 // smaller than 1.0) we'll get 1. |
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469 _reserve_regions = (uint) ceil(reserve_regions_d); |
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470 |
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471 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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472 } |
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473 |
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474 uint G1CollectorPolicy::calculate_young_list_desired_min_length( |
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475 uint base_min_length) { |
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476 uint desired_min_length = 0; |
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477 if (adaptive_young_list_length()) { |
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478 if (_alloc_rate_ms_seq->num() > 3) { |
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479 double now_sec = os::elapsedTime(); |
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480 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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481 double alloc_rate_ms = predict_alloc_rate_ms(); |
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482 desired_min_length = (uint) ceil(alloc_rate_ms * when_ms); |
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483 } else { |
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484 // otherwise we don't have enough info to make the prediction |
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485 } |
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486 } |
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487 desired_min_length += base_min_length; |
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488 // make sure we don't go below any user-defined minimum bound |
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489 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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490 } |
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491 |
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492 uint G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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493 // Here, we might want to also take into account any additional |
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494 // constraints (i.e., user-defined minimum bound). Currently, we |
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495 // effectively don't set this bound. |
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496 return _young_gen_sizer->max_desired_young_length(); |
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497 } |
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498 |
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499 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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500 if (rs_lengths == (size_t) -1) { |
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501 // if it's set to the default value (-1), we should predict it; |
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502 // otherwise, use the given value. |
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503 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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504 } |
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505 |
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506 // Calculate the absolute and desired min bounds. |
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507 |
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508 // This is how many young regions we already have (currently: the survivors). |
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509 uint base_min_length = recorded_survivor_regions(); |
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510 // This is the absolute minimum young length, which ensures that we |
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511 // can allocate one eden region in the worst-case. |
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512 uint absolute_min_length = base_min_length + 1; |
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513 uint desired_min_length = |
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514 calculate_young_list_desired_min_length(base_min_length); |
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515 if (desired_min_length < absolute_min_length) { |
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516 desired_min_length = absolute_min_length; |
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517 } |
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518 |
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519 // Calculate the absolute and desired max bounds. |
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520 |
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521 // We will try our best not to "eat" into the reserve. |
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522 uint absolute_max_length = 0; |
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523 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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524 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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525 } |
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526 uint desired_max_length = calculate_young_list_desired_max_length(); |
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527 if (desired_max_length > absolute_max_length) { |
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528 desired_max_length = absolute_max_length; |
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529 } |
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530 |
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531 uint young_list_target_length = 0; |
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532 if (adaptive_young_list_length()) { |
4710 | 533 if (gcs_are_young()) { |
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534 young_list_target_length = |
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535 calculate_young_list_target_length(rs_lengths, |
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536 base_min_length, |
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537 desired_min_length, |
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538 desired_max_length); |
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539 _rs_lengths_prediction = rs_lengths; |
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540 } else { |
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541 // Don't calculate anything and let the code below bound it to |
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542 // the desired_min_length, i.e., do the next GC as soon as |
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543 // possible to maximize how many old regions we can add to it. |
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544 } |
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545 } else { |
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546 // The user asked for a fixed young gen so we'll fix the young gen |
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547 // whether the next GC is young or mixed. |
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548 young_list_target_length = _young_list_fixed_length; |
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549 } |
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550 |
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551 // Make sure we don't go over the desired max length, nor under the |
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552 // desired min length. In case they clash, desired_min_length wins |
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553 // which is why that test is second. |
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554 if (young_list_target_length > desired_max_length) { |
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555 young_list_target_length = desired_max_length; |
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556 } |
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557 if (young_list_target_length < desired_min_length) { |
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558 young_list_target_length = desired_min_length; |
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559 } |
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560 |
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561 assert(young_list_target_length > recorded_survivor_regions(), |
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562 "we should be able to allocate at least one eden region"); |
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563 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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564 _young_list_target_length = young_list_target_length; |
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565 |
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566 update_max_gc_locker_expansion(); |
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567 } |
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568 |
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569 uint |
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570 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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571 uint base_min_length, |
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572 uint desired_min_length, |
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573 uint desired_max_length) { |
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574 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 575 assert(gcs_are_young(), "only call this for young GCs"); |
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576 |
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577 // In case some edge-condition makes the desired max length too small... |
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578 if (desired_max_length <= desired_min_length) { |
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579 return desired_min_length; |
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580 } |
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581 |
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582 // We'll adjust min_young_length and max_young_length not to include |
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583 // the already allocated young regions (i.e., so they reflect the |
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584 // min and max eden regions we'll allocate). The base_min_length |
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585 // will be reflected in the predictions by the |
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586 // survivor_regions_evac_time prediction. |
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587 assert(desired_min_length > base_min_length, "invariant"); |
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588 uint min_young_length = desired_min_length - base_min_length; |
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589 assert(desired_max_length > base_min_length, "invariant"); |
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590 uint max_young_length = desired_max_length - base_min_length; |
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591 |
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592 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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593 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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594 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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595 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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596 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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597 double base_time_ms = |
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598 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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599 survivor_regions_evac_time; |
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600 uint available_free_regions = _free_regions_at_end_of_collection; |
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601 uint base_free_regions = 0; |
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602 if (available_free_regions > _reserve_regions) { |
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603 base_free_regions = available_free_regions - _reserve_regions; |
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604 } |
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605 |
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606 // Here, we will make sure that the shortest young length that |
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607 // makes sense fits within the target pause time. |
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608 |
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609 if (predict_will_fit(min_young_length, base_time_ms, |
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610 base_free_regions, target_pause_time_ms)) { |
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611 // The shortest young length will fit into the target pause time; |
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612 // we'll now check whether the absolute maximum number of young |
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613 // regions will fit in the target pause time. If not, we'll do |
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614 // a binary search between min_young_length and max_young_length. |
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615 if (predict_will_fit(max_young_length, base_time_ms, |
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616 base_free_regions, target_pause_time_ms)) { |
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617 // The maximum young length will fit into the target pause time. |
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618 // We are done so set min young length to the maximum length (as |
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619 // the result is assumed to be returned in min_young_length). |
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620 min_young_length = max_young_length; |
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621 } else { |
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622 // The maximum possible number of young regions will not fit within |
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623 // the target pause time so we'll search for the optimal |
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624 // length. The loop invariants are: |
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625 // |
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626 // min_young_length < max_young_length |
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627 // min_young_length is known to fit into the target pause time |
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628 // max_young_length is known not to fit into the target pause time |
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629 // |
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630 // Going into the loop we know the above hold as we've just |
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631 // checked them. Every time around the loop we check whether |
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632 // the middle value between min_young_length and |
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633 // max_young_length fits into the target pause time. If it |
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634 // does, it becomes the new min. If it doesn't, it becomes |
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635 // the new max. This way we maintain the loop invariants. |
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636 |
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637 assert(min_young_length < max_young_length, "invariant"); |
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638 uint diff = (max_young_length - min_young_length) / 2; |
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639 while (diff > 0) { |
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640 uint young_length = min_young_length + diff; |
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641 if (predict_will_fit(young_length, base_time_ms, |
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642 base_free_regions, target_pause_time_ms)) { |
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643 min_young_length = young_length; |
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644 } else { |
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645 max_young_length = young_length; |
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646 } |
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647 assert(min_young_length < max_young_length, "invariant"); |
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648 diff = (max_young_length - min_young_length) / 2; |
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649 } |
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650 // The results is min_young_length which, according to the |
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651 // loop invariants, should fit within the target pause time. |
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652 |
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653 // These are the post-conditions of the binary search above: |
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654 assert(min_young_length < max_young_length, |
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655 "otherwise we should have discovered that max_young_length " |
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656 "fits into the pause target and not done the binary search"); |
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657 assert(predict_will_fit(min_young_length, base_time_ms, |
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658 base_free_regions, target_pause_time_ms), |
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659 "min_young_length, the result of the binary search, should " |
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660 "fit into the pause target"); |
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661 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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662 base_free_regions, target_pause_time_ms), |
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663 "min_young_length, the result of the binary search, should be " |
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664 "optimal, so no larger length should fit into the pause target"); |
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665 } |
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666 } else { |
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667 // Even the minimum length doesn't fit into the pause time |
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668 // target, return it as the result nevertheless. |
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669 } |
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670 return base_min_length + min_young_length; |
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671 } |
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672 |
545 | 673 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
674 double survivor_regions_evac_time = 0.0; | |
675 for (HeapRegion * r = _recorded_survivor_head; | |
676 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
677 r = r->get_next_young_region()) { | |
6611 | 678 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, gcs_are_young()); |
545 | 679 } |
680 return survivor_regions_evac_time; | |
681 } | |
682 | |
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683 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 684 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
685 | |
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686 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 687 if (rs_lengths > _rs_lengths_prediction) { |
688 // add 10% to avoid having to recalculate often | |
689 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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690 update_young_list_target_length(rs_lengths_prediction); |
342 | 691 } |
692 } | |
693 | |
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694 |
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695 |
342 | 696 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
697 bool is_tlab, | |
698 bool* gc_overhead_limit_was_exceeded) { | |
699 guarantee(false, "Not using this policy feature yet."); | |
700 return NULL; | |
701 } | |
702 | |
703 // This method controls how a collector handles one or more | |
704 // of its generations being fully allocated. | |
705 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
706 bool is_tlab) { | |
707 guarantee(false, "Not using this policy feature yet."); | |
708 return NULL; | |
709 } | |
710 | |
711 | |
712 #ifndef PRODUCT | |
713 bool G1CollectorPolicy::verify_young_ages() { | |
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714 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 715 return |
716 verify_young_ages(head, _short_lived_surv_rate_group); | |
717 // also call verify_young_ages on any additional surv rate groups | |
718 } | |
719 | |
720 bool | |
721 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
722 SurvRateGroup *surv_rate_group) { | |
723 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
724 | |
725 const char* name = surv_rate_group->name(); | |
726 bool ret = true; | |
727 int prev_age = -1; | |
728 | |
729 for (HeapRegion* curr = head; | |
730 curr != NULL; | |
731 curr = curr->get_next_young_region()) { | |
732 SurvRateGroup* group = curr->surv_rate_group(); | |
733 if (group == NULL && !curr->is_survivor()) { | |
734 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
735 ret = false; | |
736 } | |
737 | |
738 if (surv_rate_group == group) { | |
739 int age = curr->age_in_surv_rate_group(); | |
740 | |
741 if (age < 0) { | |
742 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
743 ret = false; | |
744 } | |
745 | |
746 if (age <= prev_age) { | |
747 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
748 "(%d, %d)", name, age, prev_age); | |
749 ret = false; | |
750 } | |
751 prev_age = age; | |
752 } | |
753 } | |
754 | |
755 return ret; | |
756 } | |
757 #endif // PRODUCT | |
758 | |
759 void G1CollectorPolicy::record_full_collection_start() { | |
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760 _full_collection_start_sec = os::elapsedTime(); |
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761 record_heap_size_info_at_start(true /* full */); |
342 | 762 // Release the future to-space so that it is available for compaction into. |
763 _g1->set_full_collection(); | |
764 } | |
765 | |
766 void G1CollectorPolicy::record_full_collection_end() { | |
767 // Consider this like a collection pause for the purposes of allocation | |
768 // since last pause. | |
769 double end_sec = os::elapsedTime(); | |
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770 double full_gc_time_sec = end_sec - _full_collection_start_sec; |
342 | 771 double full_gc_time_ms = full_gc_time_sec * 1000.0; |
772 | |
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773 _trace_gen1_time_data.record_full_collection(full_gc_time_ms); |
342 | 774 |
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775 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 776 |
777 _g1->clear_full_collection(); | |
778 | |
4710 | 779 // "Nuke" the heuristics that control the young/mixed GC |
780 // transitions and make sure we start with young GCs after the Full GC. | |
781 set_gcs_are_young(true); | |
782 _last_young_gc = false; | |
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783 clear_initiate_conc_mark_if_possible(); |
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784 clear_during_initial_mark_pause(); |
342 | 785 _in_marking_window = false; |
786 _in_marking_window_im = false; | |
787 | |
788 _short_lived_surv_rate_group->start_adding_regions(); | |
789 // also call this on any additional surv rate groups | |
790 | |
545 | 791 record_survivor_regions(0, NULL, NULL); |
792 | |
342 | 793 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 794 // Reset survivors SurvRateGroup. |
795 _survivor_surv_rate_group->reset(); | |
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796 update_young_list_target_length(); |
6011 | 797 _collectionSetChooser->clear(); |
1973 | 798 } |
342 | 799 |
800 void G1CollectorPolicy::record_stop_world_start() { | |
801 _stop_world_start = os::elapsedTime(); | |
802 } | |
803 | |
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804 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec) { |
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805 // We only need to do this here as the policy will only be applied |
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806 // to the GC we're about to start. so, no point is calculating this |
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807 // every time we calculate / recalculate the target young length. |
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808 update_survivors_policy(); |
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809 |
1973 | 810 assert(_g1->used() == _g1->recalculate_used(), |
811 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
812 _g1->used(), _g1->recalculate_used())); | |
342 | 813 |
814 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
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815 _trace_gen0_time_data.record_start_collection(s_w_t_ms); |
342 | 816 _stop_world_start = 0.0; |
817 | |
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818 record_heap_size_info_at_start(false /* full */); |
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819 |
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820 phase_times()->record_cur_collection_start_sec(start_time_sec); |
342 | 821 _pending_cards = _g1->pending_card_num(); |
822 | |
6611 | 823 _collection_set_bytes_used_before = 0; |
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824 _bytes_copied_during_gc = 0; |
342 | 825 |
4710 | 826 _last_gc_was_young = false; |
342 | 827 |
828 // do that for any other surv rate groups | |
829 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 830 _survivors_age_table.clear(); |
545 | 831 |
342 | 832 assert( verify_young_ages(), "region age verification" ); |
833 } | |
834 | |
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835 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 836 mark_init_elapsed_time_ms) { |
837 _during_marking = true; | |
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838 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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839 clear_during_initial_mark_pause(); |
342 | 840 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
841 } | |
842 | |
843 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
844 _mark_remark_start_sec = os::elapsedTime(); | |
845 _during_marking = false; | |
846 } | |
847 | |
848 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
849 double end_time_sec = os::elapsedTime(); | |
850 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
851 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
852 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
853 _prev_collection_pause_end_ms += elapsed_time_ms; | |
854 | |
855 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
856 } | |
857 | |
858 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
859 _mark_cleanup_start_sec = os::elapsedTime(); | |
860 } | |
861 | |
4013 | 862 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 863 _last_young_gc = true; |
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864 _in_marking_window = false; |
342 | 865 } |
866 | |
867 void G1CollectorPolicy::record_concurrent_pause() { | |
868 if (_stop_world_start > 0.0) { | |
869 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
6109
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870 _trace_gen0_time_data.record_yield_time(yield_ms); |
342 | 871 } |
872 } | |
873 | |
4834
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874 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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875 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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876 return false; |
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877 } |
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878 |
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879 size_t marking_initiating_used_threshold = |
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880 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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881 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
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882 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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883 |
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884 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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885 if (gcs_are_young() && !_last_young_gc) { |
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886 ergo_verbose5(ErgoConcCycles, |
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887 "request concurrent cycle initiation", |
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888 ergo_format_reason("occupancy higher than threshold") |
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889 ergo_format_byte("occupancy") |
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890 ergo_format_byte("allocation request") |
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891 ergo_format_byte_perc("threshold") |
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892 ergo_format_str("source"), |
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893 cur_used_bytes, |
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894 alloc_byte_size, |
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895 marking_initiating_used_threshold, |
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896 (double) InitiatingHeapOccupancyPercent, |
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897 source); |
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898 return true; |
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|
899 } else { |
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900 ergo_verbose5(ErgoConcCycles, |
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901 "do not request concurrent cycle initiation", |
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902 ergo_format_reason("still doing mixed collections") |
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903 ergo_format_byte("occupancy") |
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904 ergo_format_byte("allocation request") |
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905 ergo_format_byte_perc("threshold") |
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906 ergo_format_str("source"), |
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907 cur_used_bytes, |
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908 alloc_byte_size, |
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909 marking_initiating_used_threshold, |
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910 (double) InitiatingHeapOccupancyPercent, |
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911 source); |
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912 } |
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|
913 } |
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|
914 |
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|
915 return false; |
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|
916 } |
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|
917 |
342 | 918 // Anything below that is considered to be zero |
919 #define MIN_TIMER_GRANULARITY 0.0000001 | |
920 | |
10405 | 921 void G1CollectorPolicy::record_collection_pause_end(double pause_time_ms, EvacuationInfo& evacuation_info) { |
342 | 922 double end_time_sec = os::elapsedTime(); |
4090
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923 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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924 "otherwise, the subtraction below does not make sense"); |
342 | 925 size_t rs_size = |
4090
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|
926 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 927 size_t cur_used_bytes = _g1->used(); |
928 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
929 bool last_pause_included_initial_mark = false; | |
1707 | 930 bool update_stats = !_g1->evacuation_failed(); |
342 | 931 |
932 #ifndef PRODUCT | |
933 if (G1YoungSurvRateVerbose) { | |
934 gclog_or_tty->print_cr(""); | |
935 _short_lived_surv_rate_group->print(); | |
936 // do that for any other surv rate groups too | |
937 } | |
938 #endif // PRODUCT | |
939 | |
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940 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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941 if (last_pause_included_initial_mark) { |
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942 record_concurrent_mark_init_end(0.0); |
11125
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943 } else if (need_to_start_conc_mark("end of GC")) { |
4829
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944 // Note: this might have already been set, if during the last |
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945 // pause we decided to start a cycle but at the beginning of |
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946 // this pause we decided to postpone it. That's OK. |
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947 set_initiate_conc_mark_if_possible(); |
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948 } |
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|
949 |
6219
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950 _mmu_tracker->add_pause(end_time_sec - pause_time_ms/1000.0, |
342 | 951 end_time_sec, false); |
952 | |
10405 | 953 evacuation_info.set_collectionset_used_before(_collection_set_bytes_used_before); |
954 evacuation_info.set_bytes_copied(_bytes_copied_during_gc); | |
955 | |
595
3698e8f47799
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956 if (update_stats) { |
6219
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957 _trace_gen0_time_data.record_end_collection(pause_time_ms, phase_times()); |
342 | 958 // this is where we update the allocation rate of the application |
959 double app_time_ms = | |
6628
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diff
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|
960 (phase_times()->cur_collection_start_sec() * 1000.0 - _prev_collection_pause_end_ms); |
342 | 961 if (app_time_ms < MIN_TIMER_GRANULARITY) { |
962 // This usually happens due to the timer not having the required | |
963 // granularity. Some Linuxes are the usual culprits. | |
964 // We'll just set it to something (arbitrarily) small. | |
965 app_time_ms = 1.0; | |
966 } | |
4090
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967 // We maintain the invariant that all objects allocated by mutator |
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968 // threads will be allocated out of eden regions. So, we can use |
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969 // the eden region number allocated since the previous GC to |
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970 // calculate the application's allocate rate. The only exception |
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971 // to that is humongous objects that are allocated separately. But |
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972 // given that humongous object allocations do not really affect |
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973 // either the pause's duration nor when the next pause will take |
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|
974 // place we can safely ignore them here. |
6010
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|
975 uint regions_allocated = eden_cset_region_length(); |
342 | 976 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
977 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
978 | |
979 double interval_ms = | |
980 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
6219
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981 update_recent_gc_times(end_time_sec, pause_time_ms); |
342 | 982 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
1086
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983 if (recent_avg_pause_time_ratio() < 0.0 || |
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984 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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985 #ifndef PRODUCT |
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986 // Dump info to allow post-facto debugging |
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|
987 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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|
988 gclog_or_tty->print_cr("-------------------------------------------"); |
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989 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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990 _recent_gc_times_ms->dump(); |
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991 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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992 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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|
993 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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|
994 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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995 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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|
996 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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997 #endif // !PRODUCT |
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998 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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999 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1000 if (_recent_avg_pause_time_ratio < 0.0) { |
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1001 _recent_avg_pause_time_ratio = 0.0; |
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1002 } else { |
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1003 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1004 _recent_avg_pause_time_ratio = 1.0; |
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1005 } |
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1006 } |
342 | 1007 } |
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1008 |
342 | 1009 bool new_in_marking_window = _in_marking_window; |
1010 bool new_in_marking_window_im = false; | |
1359
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1011 if (during_initial_mark_pause()) { |
342 | 1012 new_in_marking_window = true; |
1013 new_in_marking_window_im = true; | |
1014 } | |
1015 | |
4710 | 1016 if (_last_young_gc) { |
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1017 // This is supposed to to be the "last young GC" before we start |
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1018 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1019 |
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1020 if (!last_pause_included_initial_mark) { |
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1021 if (next_gc_should_be_mixed("start mixed GCs", |
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1022 "do not start mixed GCs")) { |
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1023 set_gcs_are_young(false); |
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1024 } |
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1025 } else { |
4710 | 1026 ergo_verbose0(ErgoMixedGCs, |
1027 "do not start mixed GCs", | |
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1028 ergo_format_reason("concurrent cycle is about to start")); |
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1029 } |
4710 | 1030 _last_young_gc = false; |
3867
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1031 } |
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1032 |
4710 | 1033 if (!_last_gc_was_young) { |
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1034 // This is a mixed GC. Here we decide whether to continue doing |
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1035 // mixed GCs or not. |
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1036 |
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1037 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1038 "do not continue mixed GCs")) { |
4710 | 1039 set_gcs_are_young(true); |
342 | 1040 } |
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1041 } |
4710 | 1042 |
342 | 1043 _short_lived_surv_rate_group->start_adding_regions(); |
1044 // do that for any other surv rate groupsx | |
1045 | |
677 | 1046 if (update_stats) { |
342 | 1047 double cost_per_card_ms = 0.0; |
1048 if (_pending_cards > 0) { | |
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1049 cost_per_card_ms = phase_times()->average_last_update_rs_time() / (double) _pending_cards; |
342 | 1050 _cost_per_card_ms_seq->add(cost_per_card_ms); |
1051 } | |
1052 | |
1053 size_t cards_scanned = _g1->cards_scanned(); | |
1054 | |
1055 double cost_per_entry_ms = 0.0; | |
1056 if (cards_scanned > 10) { | |
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1057 cost_per_entry_ms = phase_times()->average_last_scan_rs_time() / (double) cards_scanned; |
4710 | 1058 if (_last_gc_was_young) { |
342 | 1059 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1060 } else { |
1061 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1062 } | |
342 | 1063 } |
1064 | |
1065 if (_max_rs_lengths > 0) { | |
1066 double cards_per_entry_ratio = | |
1067 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1068 if (_last_gc_was_young) { |
1069 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1070 } else { | |
1071 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1072 } | |
342 | 1073 } |
1074 | |
4727
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1075 // This is defensive. For a while _max_rs_lengths could get |
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1076 // smaller than _recorded_rs_lengths which was causing |
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1077 // rs_length_diff to get very large and mess up the RSet length |
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1078 // predictions. The reason was unsafe concurrent updates to the |
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1079 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1080 // against (see CR 7118202). This bug has now been fixed (see CR |
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1081 // 7119027). However, I'm still worried that |
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1082 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1083 // inaccurate. The concurrent refinement thread calculates an |
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1084 // RSet's length concurrently with other CR threads updating it |
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1085 // which might cause it to calculate the length incorrectly (if, |
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1086 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1087 // conditional below just in case. |
4130
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1088 size_t rs_length_diff = 0; |
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1089 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1090 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1091 } |
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1092 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1093 |
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1094 size_t freed_bytes = _heap_used_bytes_before_gc - cur_used_bytes; |
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1095 size_t copied_bytes = _collection_set_bytes_used_before - freed_bytes; |
342 | 1096 double cost_per_byte_ms = 0.0; |
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1097 |
342 | 1098 if (copied_bytes > 0) { |
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1099 cost_per_byte_ms = phase_times()->average_last_obj_copy_time() / (double) copied_bytes; |
4710 | 1100 if (_in_marking_window) { |
342 | 1101 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1102 } else { |
342 | 1103 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1104 } |
342 | 1105 } |
1106 | |
1107 double all_other_time_ms = pause_time_ms - | |
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1108 (phase_times()->average_last_update_rs_time() + phase_times()->average_last_scan_rs_time() |
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1109 + phase_times()->average_last_obj_copy_time() + phase_times()->average_last_termination_time()); |
342 | 1110 |
1111 double young_other_time_ms = 0.0; | |
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1112 if (young_cset_region_length() > 0) { |
342 | 1113 young_other_time_ms = |
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1114 phase_times()->young_cset_choice_time_ms() + |
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1115 phase_times()->young_free_cset_time_ms(); |
342 | 1116 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
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1117 (double) young_cset_region_length()); |
342 | 1118 } |
1119 double non_young_other_time_ms = 0.0; | |
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1120 if (old_cset_region_length() > 0) { |
342 | 1121 non_young_other_time_ms = |
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1122 phase_times()->non_young_cset_choice_time_ms() + |
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1123 phase_times()->non_young_free_cset_time_ms(); |
342 | 1124 |
1125 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1126 (double) old_cset_region_length()); |
342 | 1127 } |
1128 | |
1129 double constant_other_time_ms = all_other_time_ms - | |
1130 (young_other_time_ms + non_young_other_time_ms); | |
1131 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1132 | |
1133 double survival_ratio = 0.0; | |
6611 | 1134 if (_collection_set_bytes_used_before > 0) { |
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1135 survival_ratio = (double) _bytes_copied_during_gc / |
6611 | 1136 (double) _collection_set_bytes_used_before; |
342 | 1137 } |
1138 | |
1139 _pending_cards_seq->add((double) _pending_cards); | |
1140 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1141 } | |
1142 | |
1143 _in_marking_window = new_in_marking_window; | |
1144 _in_marking_window_im = new_in_marking_window_im; | |
1145 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1146 update_young_list_target_length(); |
342 | 1147 |
1111 | 1148 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1149 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
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1150 adjust_concurrent_refinement(phase_times()->average_last_update_rs_time(), |
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1151 phase_times()->sum_last_update_rs_processed_buffers(), update_rs_time_goal_ms); |
4013 | 1152 |
6011 | 1153 _collectionSetChooser->verify(); |
342 | 1154 } |
1155 | |
6059 | 1156 #define EXT_SIZE_FORMAT "%.1f%s" |
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1157 #define EXT_SIZE_PARAMS(bytes) \ |
6059 | 1158 byte_size_in_proper_unit((double)(bytes)), \ |
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1159 proper_unit_for_byte_size((bytes)) |
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1160 |
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1161 void G1CollectorPolicy::record_heap_size_info_at_start(bool full) { |
10098
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1162 YoungList* young_list = _g1->young_list(); |
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1163 _eden_used_bytes_before_gc = young_list->eden_used_bytes(); |
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1164 _survivor_used_bytes_before_gc = young_list->survivor_used_bytes(); |
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1165 _heap_capacity_bytes_before_gc = _g1->capacity(); |
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1166 _heap_used_bytes_before_gc = _g1->used(); |
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1167 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); |
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1168 |
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1169 _eden_capacity_bytes_before_gc = |
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1170 (_young_list_target_length * HeapRegion::GrainBytes) - _survivor_used_bytes_before_gc; |
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1171 |
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1172 if (full) { |
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1173 _metaspace_used_bytes_before_gc = MetaspaceAux::allocated_used_bytes(); |
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1174 } |
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1175 } |
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1176 |
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1177 void G1CollectorPolicy::print_heap_transition() { |
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1178 _g1->print_size_transition(gclog_or_tty, |
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1179 _heap_used_bytes_before_gc, |
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1180 _g1->used(), |
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1181 _g1->capacity()); |
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1182 } |
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1183 |
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1184 void G1CollectorPolicy::print_detailed_heap_transition(bool full) { |
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1185 YoungList* young_list = _g1->young_list(); |
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1186 |
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1187 size_t eden_used_bytes_after_gc = young_list->eden_used_bytes(); |
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1188 size_t survivor_used_bytes_after_gc = young_list->survivor_used_bytes(); |
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1189 size_t heap_used_bytes_after_gc = _g1->used(); |
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1190 |
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1191 size_t heap_capacity_bytes_after_gc = _g1->capacity(); |
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1192 size_t eden_capacity_bytes_after_gc = |
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1193 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_used_bytes_after_gc; |
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1194 |
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1195 gclog_or_tty->print( |
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1196 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1197 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1198 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1199 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1200 EXT_SIZE_PARAMS(_eden_used_bytes_before_gc), |
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1201 EXT_SIZE_PARAMS(_eden_capacity_bytes_before_gc), |
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1202 EXT_SIZE_PARAMS(eden_used_bytes_after_gc), |
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1203 EXT_SIZE_PARAMS(eden_capacity_bytes_after_gc), |
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1204 EXT_SIZE_PARAMS(_survivor_used_bytes_before_gc), |
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1205 EXT_SIZE_PARAMS(survivor_used_bytes_after_gc), |
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1206 EXT_SIZE_PARAMS(_heap_used_bytes_before_gc), |
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1207 EXT_SIZE_PARAMS(_heap_capacity_bytes_before_gc), |
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1208 EXT_SIZE_PARAMS(heap_used_bytes_after_gc), |
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1209 EXT_SIZE_PARAMS(heap_capacity_bytes_after_gc)); |
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1210 |
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1211 if (full) { |
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1212 MetaspaceAux::print_metaspace_change(_metaspace_used_bytes_before_gc); |
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1213 } |
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1214 |
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1215 gclog_or_tty->cr(); |
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1216 } |
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1217 |
1111 | 1218 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1219 double update_rs_processed_buffers, | |
1220 double goal_ms) { | |
1221 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1222 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1223 | |
1282 | 1224 if (G1UseAdaptiveConcRefinement) { |
1111 | 1225 const int k_gy = 3, k_gr = 6; |
1226 const double inc_k = 1.1, dec_k = 0.9; | |
1227 | |
1228 int g = cg1r->green_zone(); | |
1229 if (update_rs_time > goal_ms) { | |
1230 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1231 } else { | |
1232 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1233 g = (int)MAX2(g * inc_k, g + 1.0); | |
1234 } | |
1235 } | |
1236 // Change the refinement threads params | |
1237 cg1r->set_green_zone(g); | |
1238 cg1r->set_yellow_zone(g * k_gy); | |
1239 cg1r->set_red_zone(g * k_gr); | |
1240 cg1r->reinitialize_threads(); | |
1241 | |
1242 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1243 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1244 cg1r->yellow_zone()); | |
1245 // Change the barrier params | |
1246 dcqs.set_process_completed_threshold(processing_threshold); | |
1247 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1248 } | |
1249 | |
1250 int curr_queue_size = dcqs.completed_buffers_num(); | |
1251 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1252 dcqs.set_completed_queue_padding(curr_queue_size); | |
1253 } else { | |
1254 dcqs.set_completed_queue_padding(0); | |
1255 } | |
1256 dcqs.notify_if_necessary(); | |
1257 } | |
1258 | |
342 | 1259 double |
1260 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1261 size_t scanned_cards) { | |
1262 return | |
1263 predict_rs_update_time_ms(pending_cards) + | |
1264 predict_rs_scan_time_ms(scanned_cards) + | |
1265 predict_constant_other_time_ms(); | |
1266 } | |
1267 | |
1268 double | |
6611 | 1269 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { |
1270 size_t rs_length = predict_rs_length_diff(); | |
342 | 1271 size_t card_num; |
4710 | 1272 if (gcs_are_young()) { |
342 | 1273 card_num = predict_young_card_num(rs_length); |
4710 | 1274 } else { |
342 | 1275 card_num = predict_non_young_card_num(rs_length); |
4710 | 1276 } |
6611 | 1277 return predict_base_elapsed_time_ms(pending_cards, card_num); |
342 | 1278 } |
1279 | |
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1280 size_t G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
342 | 1281 size_t bytes_to_copy; |
1282 if (hr->is_marked()) | |
1283 bytes_to_copy = hr->max_live_bytes(); | |
1284 else { | |
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1285 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1286 int age = hr->age_in_surv_rate_group(); |
545 | 1287 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1288 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1289 } | |
1290 return bytes_to_copy; | |
1291 } | |
1292 | |
6611 | 1293 double |
1294 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1295 bool for_young_gc) { | |
1296 size_t rs_length = hr->rem_set()->occupied(); | |
1297 size_t card_num; | |
1298 | |
1299 // Predicting the number of cards is based on which type of GC | |
1300 // we're predicting for. | |
1301 if (for_young_gc) { | |
1302 card_num = predict_young_card_num(rs_length); | |
1303 } else { | |
1304 card_num = predict_non_young_card_num(rs_length); | |
1305 } | |
1306 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1307 | |
1308 double region_elapsed_time_ms = | |
1309 predict_rs_scan_time_ms(card_num) + | |
1310 predict_object_copy_time_ms(bytes_to_copy); | |
1311 | |
1312 // The prediction of the "other" time for this region is based | |
1313 // upon the region type and NOT the GC type. | |
1314 if (hr->is_young()) { | |
1315 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1316 } else { | |
1317 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1318 } | |
1319 return region_elapsed_time_ms; | |
1320 } | |
1321 | |
342 | 1322 void |
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1323 G1CollectorPolicy::init_cset_region_lengths(uint eden_cset_region_length, |
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1324 uint survivor_cset_region_length) { |
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1325 _eden_cset_region_length = eden_cset_region_length; |
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1326 _survivor_cset_region_length = survivor_cset_region_length; |
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1327 _old_cset_region_length = 0; |
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1328 } |
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1329 |
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1330 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1331 _recorded_rs_lengths = rs_lengths; |
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1332 } |
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1333 |
342 | 1334 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1335 double elapsed_ms) { | |
1336 _recent_gc_times_ms->add(elapsed_ms); | |
1337 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1338 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1339 } | |
1340 | |
1341 size_t G1CollectorPolicy::expansion_amount() { | |
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1342 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1343 double threshold = _gc_overhead_perc; |
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1344 if (recent_gc_overhead > threshold) { |
751 | 1345 // We will double the existing space, or take |
1346 // G1ExpandByPercentOfAvailable % of the available expansion | |
1347 // space, whichever is smaller, bounded below by a minimum | |
1348 // expansion (unless that's all that's left.) | |
342 | 1349 const size_t min_expand_bytes = 1*M; |
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1350 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1351 size_t committed_bytes = _g1->capacity(); |
1352 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1353 size_t expand_bytes; | |
1354 size_t expand_bytes_via_pct = | |
751 | 1355 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1356 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1357 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1358 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1359 |
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1360 ergo_verbose5(ErgoHeapSizing, |
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1361 "attempt heap expansion", |
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1362 ergo_format_reason("recent GC overhead higher than " |
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1363 "threshold after GC") |
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1364 ergo_format_perc("recent GC overhead") |
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1365 ergo_format_perc("threshold") |
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1366 ergo_format_byte("uncommitted") |
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1367 ergo_format_byte_perc("calculated expansion amount"), |
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1368 recent_gc_overhead, threshold, |
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1369 uncommitted_bytes, |
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1370 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1371 |
342 | 1372 return expand_bytes; |
1373 } else { | |
1374 return 0; | |
1375 } | |
1376 } | |
1377 | |
1378 void G1CollectorPolicy::print_tracing_info() const { | |
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1379 _trace_gen0_time_data.print(); |
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1380 _trace_gen1_time_data.print(); |
342 | 1381 } |
1382 | |
1383 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
1384 #ifndef PRODUCT | |
1385 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
1386 // add this call for any other surv rate groups | |
1387 #endif // PRODUCT | |
1388 } | |
1389 | |
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1390 uint G1CollectorPolicy::max_regions(int purpose) { |
342 | 1391 switch (purpose) { |
1392 case GCAllocForSurvived: | |
545 | 1393 return _max_survivor_regions; |
342 | 1394 case GCAllocForTenured: |
545 | 1395 return REGIONS_UNLIMITED; |
342 | 1396 default: |
545 | 1397 ShouldNotReachHere(); |
1398 return REGIONS_UNLIMITED; | |
342 | 1399 }; |
1400 } | |
1401 | |
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1402 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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1403 uint expansion_region_num = 0; |
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1404 if (GCLockerEdenExpansionPercent > 0) { |
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1405 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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1406 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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|
1407 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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|
1408 // less than 1.0) we'll get 1. |
6010
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1409 expansion_region_num = (uint) ceil(expansion_region_num_d); |
1991
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|
1410 } else { |
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|
1411 assert(expansion_region_num == 0, "sanity"); |
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|
1412 } |
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|
1413 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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|
1414 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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1415 } |
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|
1416 |
545 | 1417 // Calculates survivor space parameters. |
3919
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1418 void G1CollectorPolicy::update_survivors_policy() { |
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1419 double max_survivor_regions_d = |
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1420 (double) _young_list_target_length / (double) SurvivorRatio; |
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1421 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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1422 // smaller than 1.0) we'll get 1. |
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1423 _max_survivor_regions = (uint) ceil(max_survivor_regions_d); |
3919
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1424 |
3868
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|
1425 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 1426 HeapRegion::GrainWords * _max_survivor_regions); |
1427 } | |
1428 | |
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1429 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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1430 GCCause::Cause gc_cause) { |
1656
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|
1431 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1432 if (!during_cycle) { |
3914
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1433 ergo_verbose1(ErgoConcCycles, |
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1434 "request concurrent cycle initiation", |
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|
1435 ergo_format_reason("requested by GC cause") |
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1436 ergo_format_str("GC cause"), |
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|
1437 GCCause::to_string(gc_cause)); |
1656
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|
1438 set_initiate_conc_mark_if_possible(); |
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|
1439 return true; |
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|
1440 } else { |
3914
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1441 ergo_verbose1(ErgoConcCycles, |
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1442 "do not request concurrent cycle initiation", |
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1443 ergo_format_reason("concurrent cycle already in progress") |
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|
1444 ergo_format_str("GC cause"), |
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|
1445 GCCause::to_string(gc_cause)); |
1656
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|
1446 return false; |
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|
1447 } |
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|
1448 } |
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|
1449 |
342 | 1450 void |
1359
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|
1451 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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1452 // We are about to decide on whether this pause will be an |
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1453 // initial-mark pause. |
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1454 |
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1455 // First, during_initial_mark_pause() should not be already set. We |
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|
1456 // will set it here if we have to. However, it should be cleared by |
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1457 // the end of the pause (it's only set for the duration of an |
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|
1458 // initial-mark pause). |
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|
1459 assert(!during_initial_mark_pause(), "pre-condition"); |
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1460 |
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|
1461 if (initiate_conc_mark_if_possible()) { |
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1462 // We had noticed on a previous pause that the heap occupancy has |
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1463 // gone over the initiating threshold and we should start a |
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|
1464 // concurrent marking cycle. So we might initiate one. |
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|
1465 |
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|
1466 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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|
1467 if (!during_cycle) { |
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|
1468 // The concurrent marking thread is not "during a cycle", i.e., |
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|
1469 // it has completed the last one. So we can go ahead and |
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|
1470 // initiate a new cycle. |
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|
1471 |
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|
1472 set_during_initial_mark_pause(); |
4710 | 1473 // We do not allow mixed GCs during marking. |
1474 if (!gcs_are_young()) { | |
1475 set_gcs_are_young(true); | |
1476 ergo_verbose0(ErgoMixedGCs, | |
1477 "end mixed GCs", | |
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
johnc
parents:
3979
diff
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|
1478 ergo_format_reason("concurrent cycle is about to start")); |
273b46400613
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|
1479 } |
1359
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|
1480 |
23b1b27ac76c
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|
1481 // And we can now clear initiate_conc_mark_if_possible() as |
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|
1482 // we've already acted on it. |
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|
1483 clear_initiate_conc_mark_if_possible(); |
3914
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|
1484 |
20213c8a3c40
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|
1485 ergo_verbose0(ErgoConcCycles, |
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|
1486 "initiate concurrent cycle", |
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|
1487 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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|
1488 } else { |
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|
1489 // The concurrent marking thread is still finishing up the |
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|
1490 // previous cycle. If we start one right now the two cycles |
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1491 // overlap. In particular, the concurrent marking thread might |
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1492 // be in the process of clearing the next marking bitmap (which |
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|
1493 // we will use for the next cycle if we start one). Starting a |
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1494 // cycle now will be bad given that parts of the marking |
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1495 // information might get cleared by the marking thread. And we |
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1496 // cannot wait for the marking thread to finish the cycle as it |
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|
1497 // periodically yields while clearing the next marking bitmap |
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1498 // and, if it's in a yield point, it's waiting for us to |
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1499 // finish. So, at this point we will not start a cycle and we'll |
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|
1500 // let the concurrent marking thread complete the last one. |
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1501 ergo_verbose0(ErgoConcCycles, |
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|
1502 "do not initiate concurrent cycle", |
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|
1503 ergo_format_reason("concurrent cycle already in progress")); |
1359
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1504 } |
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1505 } |
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1506 } |
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|
1507 |
342 | 1508 class KnownGarbageClosure: public HeapRegionClosure { |
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|
1509 G1CollectedHeap* _g1h; |
342 | 1510 CollectionSetChooser* _hrSorted; |
1511 | |
1512 public: | |
1513 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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1514 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 1515 |
1516 bool doHeapRegion(HeapRegion* r) { | |
1517 // We only include humongous regions in collection | |
1518 // sets when concurrent mark shows that their contained object is | |
1519 // unreachable. | |
1520 | |
1521 // Do we have any marking information for this region? | |
1522 if (r->is_marked()) { | |
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1523 // We will skip any region that's currently used as an old GC |
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1524 // alloc region (we should not consider those for collection |
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|
1525 // before we fill them up). |
6011 | 1526 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
1527 _hrSorted->add_region(r); | |
342 | 1528 } |
1529 } | |
1530 return false; | |
1531 } | |
1532 }; | |
1533 | |
1534 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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1535 G1CollectedHeap* _g1h; |
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1536 CSetChooserParUpdater _cset_updater; |
342 | 1537 |
1538 public: | |
1539 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
6011 | 1540 uint chunk_size) : |
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1541 _g1h(G1CollectedHeap::heap()), |
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1542 _cset_updater(hrSorted, true /* parallel */, chunk_size) { } |
342 | 1543 |
1544 bool doHeapRegion(HeapRegion* r) { | |
1545 // Do we have any marking information for this region? | |
1546 if (r->is_marked()) { | |
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1547 // We will skip any region that's currently used as an old GC |
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1548 // alloc region (we should not consider those for collection |
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1549 // before we fill them up). |
6254
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1550 if (_cset_updater.should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
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1551 _cset_updater.add_region(r); |
342 | 1552 } |
1553 } | |
1554 return false; | |
1555 } | |
1556 }; | |
1557 | |
1558 class ParKnownGarbageTask: public AbstractGangTask { | |
1559 CollectionSetChooser* _hrSorted; | |
6011 | 1560 uint _chunk_size; |
342 | 1561 G1CollectedHeap* _g1; |
1562 public: | |
6011 | 1563 ParKnownGarbageTask(CollectionSetChooser* hrSorted, uint chunk_size) : |
342 | 1564 AbstractGangTask("ParKnownGarbageTask"), |
1565 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
4912
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1566 _g1(G1CollectedHeap::heap()) { } |
342 | 1567 |
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1568 void work(uint worker_id) { |
6011 | 1569 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size); |
1570 | |
342 | 1571 // Back to zero for the claim value. |
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1572 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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1573 _g1->workers()->active_workers(), |
355 | 1574 HeapRegion::InitialClaimValue); |
342 | 1575 } |
1576 }; | |
1577 | |
1578 void | |
4095
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1579 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
6011 | 1580 _collectionSetChooser->clear(); |
4013 | 1581 |
6010
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1582 uint region_num = _g1->n_regions(); |
1833
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|
1583 if (G1CollectedHeap::use_parallel_gc_threads()) { |
6010
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1584 const uint OverpartitionFactor = 4; |
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1585 uint WorkUnit; |
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1586 // The use of MinChunkSize = 8 in the original code |
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1587 // causes some assertion failures when the total number of |
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1588 // region is less than 8. The code here tries to fix that. |
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1589 // Should the original code also be fixed? |
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1590 if (no_of_gc_threads > 0) { |
6010
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1591 const uint MinWorkUnit = MAX2(region_num / no_of_gc_threads, 1U); |
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1592 WorkUnit = MAX2(region_num / (no_of_gc_threads * OverpartitionFactor), |
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1593 MinWorkUnit); |
4095
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|
1594 } else { |
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|
1595 assert(no_of_gc_threads > 0, |
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|
1596 "The active gc workers should be greater than 0"); |
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|
1597 // In a product build do something reasonable to avoid a crash. |
6010
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|
1598 const uint MinWorkUnit = MAX2(region_num / (uint) ParallelGCThreads, 1U); |
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1599 WorkUnit = |
6010
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1600 MAX2(region_num / (uint) (ParallelGCThreads * OverpartitionFactor), |
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|
1601 MinWorkUnit); |
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|
1602 } |
6011 | 1603 _collectionSetChooser->prepare_for_par_region_addition(_g1->n_regions(), |
1604 WorkUnit); | |
342 | 1605 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
1571
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|
1606 (int) WorkUnit); |
342 | 1607 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 1608 |
1609 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
1610 "sanity check"); | |
342 | 1611 } else { |
1612 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
1613 _g1->heap_region_iterate(&knownGarbagecl); | |
1614 } | |
4013 | 1615 |
6011 | 1616 _collectionSetChooser->sort_regions(); |
1617 | |
4013 | 1618 double end_sec = os::elapsedTime(); |
1619 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; | |
1620 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1621 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1622 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1623 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 1624 } |
1625 | |
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1626 // Add the heap region at the head of the non-incremental collection set |
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|
1627 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
1394
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|
1628 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
1629 assert(!hr->is_young(), "non-incremental add of young region"); |
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|
1630 |
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|
1631 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 1632 hr->set_in_collection_set(true); |
1633 hr->set_next_in_collection_set(_collection_set); | |
1634 _collection_set = hr; | |
1635 _collection_set_bytes_used_before += hr->used(); | |
526 | 1636 _g1->register_region_with_in_cset_fast_test(hr); |
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|
1637 size_t rs_length = hr->rem_set()->occupied(); |
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|
1638 _recorded_rs_lengths += rs_length; |
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|
1639 _old_cset_region_length += 1; |
342 | 1640 } |
1641 | |
1394
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|
1642 // Initialize the per-collection-set information |
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|
1643 void G1CollectorPolicy::start_incremental_cset_building() { |
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|
1644 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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|
1645 |
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|
1646 _inc_cset_head = NULL; |
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|
1647 _inc_cset_tail = NULL; |
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|
1648 _inc_cset_bytes_used_before = 0; |
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|
1649 |
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|
1650 _inc_cset_max_finger = 0; |
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|
1651 _inc_cset_recorded_rs_lengths = 0; |
4727
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|
1652 _inc_cset_recorded_rs_lengths_diffs = 0; |
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|
1653 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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|
1654 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
1394
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|
1655 _inc_cset_build_state = Active; |
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|
1656 } |
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|
1657 |
4727
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|
1658 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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|
1659 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
1660 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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|
1661 |
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|
1662 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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|
1663 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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|
1664 // that adds a new region to the CSet. Further updates by the |
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|
1665 // concurrent refinement thread that samples the young RSet lengths |
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|
1666 // are accumulated in the *_diffs fields. Here we add the diffs to |
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|
1667 // the "main" fields. |
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|
1668 |
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|
1669 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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|
1670 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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|
1671 } else { |
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|
1672 // This is defensive. The diff should in theory be always positive |
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|
1673 // as RSets can only grow between GCs. However, given that we |
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|
1674 // sample their size concurrently with other threads updating them |
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|
1675 // it's possible that we might get the wrong size back, which |
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|
1676 // could make the calculations somewhat inaccurate. |
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|
1677 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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|
1678 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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|
1679 _inc_cset_recorded_rs_lengths -= diffs; |
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|
1680 } else { |
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|
1681 _inc_cset_recorded_rs_lengths = 0; |
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|
1682 } |
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|
1683 } |
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1684 _inc_cset_predicted_elapsed_time_ms += |
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|
1685 _inc_cset_predicted_elapsed_time_ms_diffs; |
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|
1686 |
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|
1687 _inc_cset_recorded_rs_lengths_diffs = 0; |
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|
1688 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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|
1689 } |
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|
1690 |
1394
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|
1691 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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|
1692 // This routine is used when: |
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|
1693 // * adding survivor regions to the incremental cset at the end of an |
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|
1694 // evacuation pause, |
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|
1695 // * adding the current allocation region to the incremental cset |
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|
1696 // when it is retired, and |
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|
1697 // * updating existing policy information for a region in the |
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|
1698 // incremental cset via young list RSet sampling. |
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|
1699 // Therefore this routine may be called at a safepoint by the |
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|
1700 // VM thread, or in-between safepoints by mutator threads (when |
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|
1701 // retiring the current allocation region) or a concurrent |
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|
1702 // refine thread (RSet sampling). |
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|
1703 |
6611 | 1704 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
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1705 size_t used_bytes = hr->used(); |
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1706 _inc_cset_recorded_rs_lengths += rs_length; |
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|
1707 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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|
1708 _inc_cset_bytes_used_before += used_bytes; |
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|
1709 |
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|
1710 // Cache the values we have added to the aggregated informtion |
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|
1711 // in the heap region in case we have to remove this region from |
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|
1712 // the incremental collection set, or it is updated by the |
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|
1713 // rset sampling code |
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|
1714 hr->set_recorded_rs_length(rs_length); |
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|
1715 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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|
1716 } |
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|
1717 |
4727
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1718 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
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1719 size_t new_rs_length) { |
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1720 // Update the CSet information that is dependent on the new RS length |
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|
1721 assert(hr->is_young(), "Precondition"); |
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|
1722 assert(!SafepointSynchronize::is_at_safepoint(), |
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|
1723 "should not be at a safepoint"); |
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|
1724 |
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1725 // We could have updated _inc_cset_recorded_rs_lengths and |
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1726 // _inc_cset_predicted_elapsed_time_ms directly but we'd need to do |
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1727 // that atomically, as this code is executed by a concurrent |
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1728 // refinement thread, potentially concurrently with a mutator thread |
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1729 // allocating a new region and also updating the same fields. To |
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1730 // avoid the atomic operations we accumulate these updates on two |
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1731 // separate fields (*_diffs) and we'll just add them to the "main" |
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1732 // fields at the start of a GC. |
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|
1733 |
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1734 ssize_t old_rs_length = (ssize_t) hr->recorded_rs_length(); |
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1735 ssize_t rs_lengths_diff = (ssize_t) new_rs_length - old_rs_length; |
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1736 _inc_cset_recorded_rs_lengths_diffs += rs_lengths_diff; |
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|
1737 |
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1738 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
6611 | 1739 double new_region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
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1740 double elapsed_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms; |
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1741 _inc_cset_predicted_elapsed_time_ms_diffs += elapsed_ms_diff; |
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|
1742 |
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|
1743 hr->set_recorded_rs_length(new_rs_length); |
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|
1744 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
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|
1745 } |
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|
1746 |
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|
1747 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
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|
1748 assert(hr->is_young(), "invariant"); |
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|
1749 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
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|
1750 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
1751 |
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|
1752 // We need to clear and set the cached recorded/cached collection set |
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|
1753 // information in the heap region here (before the region gets added |
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|
1754 // to the collection set). An individual heap region's cached values |
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1755 // are calculated, aggregated with the policy collection set info, |
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|
1756 // and cached in the heap region here (initially) and (subsequently) |
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|
1757 // by the Young List sampling code. |
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|
1758 |
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|
1759 size_t rs_length = hr->rem_set()->occupied(); |
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|
1760 add_to_incremental_cset_info(hr, rs_length); |
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|
1761 |
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|
1762 HeapWord* hr_end = hr->end(); |
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|
1763 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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|
1764 |
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|
1765 assert(!hr->in_collection_set(), "invariant"); |
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|
1766 hr->set_in_collection_set(true); |
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|
1767 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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|
1768 |
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|
1769 _g1->register_region_with_in_cset_fast_test(hr); |
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|
1770 } |
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|
1771 |
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|
1772 // Add the region at the RHS of the incremental cset |
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|
1773 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
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|
1774 // We should only ever be appending survivors at the end of a pause |
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|
1775 assert( hr->is_survivor(), "Logic"); |
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|
1776 |
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|
1777 // Do the 'common' stuff |
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|
1778 add_region_to_incremental_cset_common(hr); |
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|
1779 |
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|
1780 // Now add the region at the right hand side |
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|
1781 if (_inc_cset_tail == NULL) { |
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|
1782 assert(_inc_cset_head == NULL, "invariant"); |
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|
1783 _inc_cset_head = hr; |
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|
1784 } else { |
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|
1785 _inc_cset_tail->set_next_in_collection_set(hr); |
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|
1786 } |
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|
1787 _inc_cset_tail = hr; |
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|
1788 } |
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|
1789 |
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|
1790 // Add the region to the LHS of the incremental cset |
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|
1791 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
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|
1792 // Survivors should be added to the RHS at the end of a pause |
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|
1793 assert(!hr->is_survivor(), "Logic"); |
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|
1794 |
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|
1795 // Do the 'common' stuff |
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|
1796 add_region_to_incremental_cset_common(hr); |
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|
1797 |
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|
1798 // Add the region at the left hand side |
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|
1799 hr->set_next_in_collection_set(_inc_cset_head); |
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1800 if (_inc_cset_head == NULL) { |
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|
1801 assert(_inc_cset_tail == NULL, "Invariant"); |
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|
1802 _inc_cset_tail = hr; |
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|
1803 } |
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|
1804 _inc_cset_head = hr; |
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|
1805 } |
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|
1806 |
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|
1807 #ifndef PRODUCT |
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|
1808 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
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|
1809 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
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|
1810 |
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|
1811 st->print_cr("\nCollection_set:"); |
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|
1812 HeapRegion* csr = list_head; |
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|
1813 while (csr != NULL) { |
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|
1814 HeapRegion* next = csr->next_in_collection_set(); |
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|
1815 assert(csr->in_collection_set(), "bad CS"); |
6027
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|
1816 st->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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|
1817 HR_FORMAT_PARAMS(csr), |
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|
1818 csr->prev_top_at_mark_start(), csr->next_top_at_mark_start(), |
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|
1819 csr->age_in_surv_rate_group_cond()); |
1394
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1820 csr = next; |
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1821 } |
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1822 } |
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|
1823 #endif // !PRODUCT |
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1824 |
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1825 double G1CollectorPolicy::reclaimable_bytes_perc(size_t reclaimable_bytes) { |
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1826 // Returns the given amount of reclaimable bytes (that represents |
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1827 // the amount of reclaimable space still to be collected) as a |
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1828 // percentage of the current heap capacity. |
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1829 size_t capacity_bytes = _g1->capacity(); |
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1830 return (double) reclaimable_bytes * 100.0 / (double) capacity_bytes; |
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1831 } |
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1832 |
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1833 bool G1CollectorPolicy::next_gc_should_be_mixed(const char* true_action_str, |
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1834 const char* false_action_str) { |
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1835 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1836 if (cset_chooser->is_empty()) { |
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1837 ergo_verbose0(ErgoMixedGCs, |
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1838 false_action_str, |
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1839 ergo_format_reason("candidate old regions not available")); |
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1840 return false; |
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1841 } |
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1842 |
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1843 // Is the amount of uncollected reclaimable space above G1HeapWastePercent? |
6011 | 1844 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
8681
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1845 double reclaimable_perc = reclaimable_bytes_perc(reclaimable_bytes); |
5964
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1846 double threshold = (double) G1HeapWastePercent; |
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1847 if (reclaimable_perc <= threshold) { |
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1848 ergo_verbose4(ErgoMixedGCs, |
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1849 false_action_str, |
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1850 ergo_format_reason("reclaimable percentage not over threshold") |
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1851 ergo_format_region("candidate old regions") |
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1852 ergo_format_byte_perc("reclaimable") |
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1853 ergo_format_perc("threshold"), |
6011 | 1854 cset_chooser->remaining_regions(), |
8681
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1855 reclaimable_bytes, |
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1856 reclaimable_perc, threshold); |
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1857 return false; |
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1858 } |
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1859 |
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1860 ergo_verbose4(ErgoMixedGCs, |
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1861 true_action_str, |
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1862 ergo_format_reason("candidate old regions available") |
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1863 ergo_format_region("candidate old regions") |
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1864 ergo_format_byte_perc("reclaimable") |
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1865 ergo_format_perc("threshold"), |
6011 | 1866 cset_chooser->remaining_regions(), |
8681
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1867 reclaimable_bytes, |
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1868 reclaimable_perc, threshold); |
4912
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1869 return true; |
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1870 } |
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1871 |
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1872 uint G1CollectorPolicy::calc_min_old_cset_length() { |
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1873 // The min old CSet region bound is based on the maximum desired |
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1874 // number of mixed GCs after a cycle. I.e., even if some old regions |
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1875 // look expensive, we should add them to the CSet anyway to make |
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1876 // sure we go through the available old regions in no more than the |
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1877 // maximum desired number of mixed GCs. |
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1878 // |
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1879 // The calculation is based on the number of marked regions we added |
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1880 // to the CSet chooser in the first place, not how many remain, so |
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1881 // that the result is the same during all mixed GCs that follow a cycle. |
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1882 |
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1883 const size_t region_num = (size_t) _collectionSetChooser->length(); |
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1884 const size_t gc_num = (size_t) MAX2(G1MixedGCCountTarget, (uintx) 1); |
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1885 size_t result = region_num / gc_num; |
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1886 // emulate ceiling |
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1887 if (result * gc_num < region_num) { |
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1888 result += 1; |
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1889 } |
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1890 return (uint) result; |
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1891 } |
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1892 |
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1893 uint G1CollectorPolicy::calc_max_old_cset_length() { |
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1894 // The max old CSet region bound is based on the threshold expressed |
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1895 // as a percentage of the heap size. I.e., it should bound the |
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1896 // number of old regions added to the CSet irrespective of how many |
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1897 // of them are available. |
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1898 |
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1899 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1900 const size_t region_num = g1h->n_regions(); |
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1901 const size_t perc = (size_t) G1OldCSetRegionThresholdPercent; |
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1902 size_t result = region_num * perc / 100; |
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1903 // emulate ceiling |
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1904 if (100 * result < region_num * perc) { |
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1905 result += 1; |
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1906 } |
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1907 return (uint) result; |
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|
1908 } |
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1909 |
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1910 |
10405 | 1911 void G1CollectorPolicy::finalize_cset(double target_pause_time_ms, EvacuationInfo& evacuation_info) { |
6611 | 1912 double young_start_time_sec = os::elapsedTime(); |
1394
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1913 |
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1914 YoungList* young_list = _g1->young_list(); |
4727
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|
1915 finalize_incremental_cset_building(); |
3914
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1916 |
1656
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1917 guarantee(target_pause_time_ms > 0.0, |
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1918 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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|
1919 target_pause_time_ms)); |
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1920 guarantee(_collection_set == NULL, "Precondition"); |
342 | 1921 |
1922 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
1923 double predicted_pause_time_ms = base_time_ms; | |
8681
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1924 double time_remaining_ms = MAX2(target_pause_time_ms - base_time_ms, 0.0); |
342 | 1925 |
6611 | 1926 ergo_verbose4(ErgoCSetConstruction | ErgoHigh, |
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1927 "start choosing CSet", |
6611 | 1928 ergo_format_size("_pending_cards") |
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1929 ergo_format_ms("predicted base time") |
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1930 ergo_format_ms("remaining time") |
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1931 ergo_format_ms("target pause time"), |
6611 | 1932 _pending_cards, base_time_ms, time_remaining_ms, target_pause_time_ms); |
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1933 |
4710 | 1934 _last_gc_was_young = gcs_are_young() ? true : false; |
1935 | |
1936 if (_last_gc_was_young) { | |
6109
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|
1937 _trace_gen0_time_data.increment_young_collection_count(); |
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1938 } else { |
6109
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|
1939 _trace_gen0_time_data.increment_mixed_collection_count(); |
3914
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|
1940 } |
3867
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|
1941 |
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1942 // The young list is laid with the survivor regions from the previous |
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1943 // pause are appended to the RHS of the young list, i.e. |
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1944 // [Newly Young Regions ++ Survivors from last pause]. |
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|
1945 |
6010
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|
1946 uint survivor_region_length = young_list->survivor_length(); |
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|
1947 uint eden_region_length = young_list->length() - survivor_region_length; |
4090
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1948 init_cset_region_lengths(eden_region_length, survivor_region_length); |
6611 | 1949 |
1950 HeapRegion* hr = young_list->first_survivor_region(); | |
3867
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1951 while (hr != NULL) { |
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1952 assert(hr->is_survivor(), "badly formed young list"); |
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|
1953 hr->set_young(); |
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1954 hr = hr->get_next_young_region(); |
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|
1955 } |
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|
1956 |
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1957 // Clear the fields that point to the survivor list - they are all young now. |
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1958 young_list->clear_survivors(); |
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1959 |
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1960 _collection_set = _inc_cset_head; |
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1961 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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1962 time_remaining_ms = MAX2(time_remaining_ms - _inc_cset_predicted_elapsed_time_ms, 0.0); |
3867
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1963 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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1964 |
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1965 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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1966 "add young regions to CSet", |
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1967 ergo_format_region("eden") |
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1968 ergo_format_region("survivors") |
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1969 ergo_format_ms("predicted young region time"), |
4090
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1970 eden_region_length, survivor_region_length, |
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1971 _inc_cset_predicted_elapsed_time_ms); |
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1972 |
3867
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1973 // The number of recorded young regions is the incremental |
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1974 // collection set's current size |
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1975 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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1976 |
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1977 double young_end_time_sec = os::elapsedTime(); |
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1978 phase_times()->record_young_cset_choice_time_ms((young_end_time_sec - young_start_time_sec) * 1000.0); |
3867
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1979 |
6611 | 1980 // Set the start of the non-young choice time. |
1981 double non_young_start_time_sec = young_end_time_sec; | |
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1982 |
4710 | 1983 if (!gcs_are_young()) { |
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1984 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1985 cset_chooser->verify(); |
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1986 const uint min_old_cset_length = calc_min_old_cset_length(); |
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1987 const uint max_old_cset_length = calc_max_old_cset_length(); |
6010
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1988 |
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1989 uint expensive_region_num = 0; |
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1990 bool check_time_remaining = adaptive_young_list_length(); |
6611 | 1991 |
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1992 HeapRegion* hr = cset_chooser->peek(); |
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1993 while (hr != NULL) { |
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1994 if (old_cset_region_length() >= max_old_cset_length) { |
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1995 // Added maximum number of old regions to the CSet. |
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1996 ergo_verbose2(ErgoCSetConstruction, |
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1997 "finish adding old regions to CSet", |
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1998 ergo_format_reason("old CSet region num reached max") |
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1999 ergo_format_region("old") |
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2000 ergo_format_region("max"), |
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2001 old_cset_region_length(), max_old_cset_length); |
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2002 break; |
342 | 2003 } |
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|
2004 |
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|
2005 |
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|
2006 // Stop adding regions if the remaining reclaimable space is |
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|
2007 // not above G1HeapWastePercent. |
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|
2008 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
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2009 double reclaimable_perc = reclaimable_bytes_perc(reclaimable_bytes); |
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|
2010 double threshold = (double) G1HeapWastePercent; |
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|
2011 if (reclaimable_perc <= threshold) { |
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|
2012 // We've added enough old regions that the amount of uncollected |
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|
2013 // reclaimable space is at or below the waste threshold. Stop |
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|
2014 // adding old regions to the CSet. |
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|
2015 ergo_verbose5(ErgoCSetConstruction, |
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|
2016 "finish adding old regions to CSet", |
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|
2017 ergo_format_reason("reclaimable percentage not over threshold") |
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|
2018 ergo_format_region("old") |
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|
2019 ergo_format_region("max") |
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2020 ergo_format_byte_perc("reclaimable") |
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|
2021 ergo_format_perc("threshold"), |
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|
2022 old_cset_region_length(), |
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|
2023 max_old_cset_length, |
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|
2024 reclaimable_bytes, |
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|
2025 reclaimable_perc, threshold); |
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changeset
|
2026 break; |
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changeset
|
2027 } |
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|
2028 |
6611 | 2029 double predicted_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
4912
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|
2030 if (check_time_remaining) { |
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|
2031 if (predicted_time_ms > time_remaining_ms) { |
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|
2032 // Too expensive for the current CSet. |
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|
2033 |
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2034 if (old_cset_region_length() >= min_old_cset_length) { |
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|
2035 // We have added the minimum number of old regions to the CSet, |
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|
2036 // we are done with this CSet. |
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|
2037 ergo_verbose4(ErgoCSetConstruction, |
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changeset
|
2038 "finish adding old regions to CSet", |
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|
2039 ergo_format_reason("predicted time is too high") |
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|
2040 ergo_format_ms("predicted time") |
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|
2041 ergo_format_ms("remaining time") |
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|
2042 ergo_format_region("old") |
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|
2043 ergo_format_region("min"), |
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|
2044 predicted_time_ms, time_remaining_ms, |
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|
2045 old_cset_region_length(), min_old_cset_length); |
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|
2046 break; |
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changeset
|
2047 } |
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|
2048 |
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|
2049 // We'll add it anyway given that we haven't reached the |
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|
2050 // minimum number of old regions. |
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|
2051 expensive_region_num += 1; |
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|
2052 } |
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|
2053 } else { |
4912
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|
2054 if (old_cset_region_length() >= min_old_cset_length) { |
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|
2055 // In the non-auto-tuning case, we'll finish adding regions |
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|
2056 // to the CSet if we reach the minimum. |
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|
2057 ergo_verbose2(ErgoCSetConstruction, |
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changeset
|
2058 "finish adding old regions to CSet", |
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|
2059 ergo_format_reason("old CSet region num reached min") |
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|
2060 ergo_format_region("old") |
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|
2061 ergo_format_region("min"), |
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|
2062 old_cset_region_length(), min_old_cset_length); |
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|
2063 break; |
3914
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|
2064 } |
20213c8a3c40
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|
2065 } |
4912
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|
2066 |
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|
2067 // We will add this region to the CSet. |
8681
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|
2068 time_remaining_ms = MAX2(time_remaining_ms - predicted_time_ms, 0.0); |
4912
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|
2069 predicted_pause_time_ms += predicted_time_ms; |
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|
2070 cset_chooser->remove_and_move_to_next(hr); |
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|
2071 _g1->old_set_remove(hr); |
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|
2072 add_old_region_to_cset(hr); |
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|
2073 |
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|
2074 hr = cset_chooser->peek(); |
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|
2075 } |
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changeset
|
2076 if (hr == NULL) { |
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|
2077 ergo_verbose0(ErgoCSetConstruction, |
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changeset
|
2078 "finish adding old regions to CSet", |
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changeset
|
2079 ergo_format_reason("candidate old regions not available")); |
3914
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changeset
|
2080 } |
20213c8a3c40
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changeset
|
2081 |
4912
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|
2082 if (expensive_region_num > 0) { |
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changeset
|
2083 // We print the information once here at the end, predicated on |
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changeset
|
2084 // whether we added any apparently expensive regions or not, to |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
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|
2085 // avoid generating output per region. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
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|
2086 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2087 "added expensive regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
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|
2088 ergo_format_reason("old CSet region num not reached min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
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|
2089 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
2090 ergo_format_region("expensive") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
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|
2091 ergo_format_region("min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
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|
2092 ergo_format_ms("remaining time"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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4837
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|
2093 old_cset_region_length(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
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|
2094 expensive_region_num, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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|
2095 min_old_cset_length, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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4837
diff
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|
2096 time_remaining_ms); |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2097 } |
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|
2098 |
6011 | 2099 cset_chooser->verify(); |
342 | 2100 } |
2101 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2102 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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|
2103 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2104 ergo_verbose5(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2105 "finish choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2106 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2107 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2108 ergo_format_region("old") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2109 ergo_format_ms("predicted pause time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2110 ergo_format_ms("target pause time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
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|
2111 eden_region_length, survivor_region_length, |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4072
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|
2112 old_cset_region_length(), |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2113 predicted_pause_time_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2114 |
342 | 2115 double non_young_end_time_sec = os::elapsedTime(); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2116 phase_times()->record_non_young_cset_choice_time_ms((non_young_end_time_sec - non_young_start_time_sec) * 1000.0); |
10405 | 2117 evacuation_info.set_collectionset_regions(cset_region_length()); |
342 | 2118 } |
6109
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|
2119 |
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|
2120 void TraceGen0TimeData::record_start_collection(double time_to_stop_the_world_ms) { |
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|
2121 if(TraceGen0Time) { |
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|
2122 _all_stop_world_times_ms.add(time_to_stop_the_world_ms); |
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|
2123 } |
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|
2124 } |
bbc900c2482a
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|
2125 |
bbc900c2482a
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|
2126 void TraceGen0TimeData::record_yield_time(double yield_time_ms) { |
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|
2127 if(TraceGen0Time) { |
bbc900c2482a
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|
2128 _all_yield_times_ms.add(yield_time_ms); |
bbc900c2482a
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brutisso
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|
2129 } |
bbc900c2482a
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|
2130 } |
bbc900c2482a
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|
2131 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2132 void TraceGen0TimeData::record_end_collection(double pause_time_ms, G1GCPhaseTimes* phase_times) { |
6109
bbc900c2482a
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|
2133 if(TraceGen0Time) { |
6219
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|
2134 _total.add(pause_time_ms); |
922993931b3d
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brutisso
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|
2135 _other.add(pause_time_ms - phase_times->accounted_time_ms()); |
6628
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7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2136 _root_region_scan_wait.add(phase_times->root_region_scan_wait_time_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
2137 _parallel.add(phase_times->cur_collection_par_time_ms()); |
bb3f6194fedb
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|
2138 _ext_root_scan.add(phase_times->average_last_ext_root_scan_time()); |
bb3f6194fedb
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|
2139 _satb_filtering.add(phase_times->average_last_satb_filtering_times_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2140 _update_rs.add(phase_times->average_last_update_rs_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2141 _scan_rs.add(phase_times->average_last_scan_rs_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2142 _obj_copy.add(phase_times->average_last_obj_copy_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2143 _termination.add(phase_times->average_last_termination_time()); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
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|
2144 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
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changeset
|
2145 double parallel_known_time = phase_times->average_last_ext_root_scan_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2146 phase_times->average_last_satb_filtering_times_ms() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2147 phase_times->average_last_update_rs_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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6611
diff
changeset
|
2148 phase_times->average_last_scan_rs_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
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|
2149 phase_times->average_last_obj_copy_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
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|
2150 + phase_times->average_last_termination_time(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2151 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2152 double parallel_other_time = phase_times->cur_collection_par_time_ms() - parallel_known_time; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
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|
2153 _parallel_other.add(parallel_other_time); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2154 _clear_ct.add(phase_times->cur_clear_ct_time_ms()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2155 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2156 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2157 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2158 void TraceGen0TimeData::increment_young_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2159 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2160 ++_young_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2161 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2162 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2163 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2164 void TraceGen0TimeData::increment_mixed_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2165 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2166 ++_mixed_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2167 } |
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 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2170 void TraceGen0TimeData::print_summary(const char* str, |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2171 const NumberSeq* seq) const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
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|
2172 double sum = seq->sum(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2173 gclog_or_tty->print_cr("%-27s = %8.2lf s (avg = %8.2lf ms)", |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2174 str, sum / 1000.0, seq->avg()); |
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 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2177 void TraceGen0TimeData::print_summary_sd(const char* str, |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2178 const NumberSeq* seq) const { |
6219
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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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|
2179 print_summary(str, seq); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2180 gclog_or_tty->print_cr("%+45s = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2181 "(num", seq->num(), seq->sd(), seq->maximum()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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|
2182 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2183 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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changeset
|
2184 void TraceGen0TimeData::print() const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2185 if (!TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2186 return; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2187 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2188 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2189 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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6109
diff
changeset
|
2190 print_summary_sd(" Total", &_total); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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changeset
|
2191 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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changeset
|
2192 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
diff
changeset
|
2193 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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6064
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changeset
|
2194 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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6064
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changeset
|
2195 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2196 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2197 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
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changeset
|
2198 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2199 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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2200 gclog_or_tty->print_cr("none"); |
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2201 } else { |
6219
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2202 print_summary_sd(" Evacuation Pauses", &_total); |
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2203 print_summary(" Root Region Scan Wait", &_root_region_scan_wait); |
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2204 print_summary(" Parallel Time", &_parallel); |
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2205 print_summary(" Ext Root Scanning", &_ext_root_scan); |
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2206 print_summary(" SATB Filtering", &_satb_filtering); |
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2207 print_summary(" Update RS", &_update_rs); |
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2208 print_summary(" Scan RS", &_scan_rs); |
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2209 print_summary(" Object Copy", &_obj_copy); |
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2210 print_summary(" Termination", &_termination); |
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2211 print_summary(" Parallel Other", &_parallel_other); |
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2212 print_summary(" Clear CT", &_clear_ct); |
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2213 print_summary(" Other", &_other); |
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2214 } |
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2215 gclog_or_tty->print_cr(""); |
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2216 |
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2217 gclog_or_tty->print_cr("MISC"); |
6219
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2218 print_summary_sd(" Stop World", &_all_stop_world_times_ms); |
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2219 print_summary_sd(" Yields", &_all_yield_times_ms); |
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2220 } |
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2221 |
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2222 void TraceGen1TimeData::record_full_collection(double full_gc_time_ms) { |
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2223 if (TraceGen1Time) { |
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2224 _all_full_gc_times.add(full_gc_time_ms); |
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2225 } |
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2226 } |
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2227 |
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2228 void TraceGen1TimeData::print() const { |
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2229 if (!TraceGen1Time) { |
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2230 return; |
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2231 } |
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2232 |
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2233 if (_all_full_gc_times.num() > 0) { |
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2234 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
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2235 _all_full_gc_times.num(), |
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2236 _all_full_gc_times.sum() / 1000.0); |
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2237 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times.avg()); |
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2238 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", |
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2239 _all_full_gc_times.sd(), |
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2240 _all_full_gc_times.maximum()); |
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2241 } |
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2242 } |