Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 8039:5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
Summary: In do_marking_step(), we should always give up current region after scanning the object, if the region is humongous.
Reviewed-by: brutisso, jwilhelm, tamao
author | johnc |
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date | Mon, 11 Feb 2013 15:24:48 -0800 |
parents | 37f7535e5f18 |
children | f1fb03a251e9 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
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33 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 34 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
35 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
36 #include "runtime/arguments.hpp" | |
37 #include "runtime/java.hpp" | |
38 #include "runtime/mutexLocker.hpp" | |
39 #include "utilities/debug.hpp" | |
342 | 40 |
41 // Different defaults for different number of GC threads | |
42 // They were chosen by running GCOld and SPECjbb on debris with different | |
43 // numbers of GC threads and choosing them based on the results | |
44 | |
45 // all the same | |
46 static double rs_length_diff_defaults[] = { | |
47 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
48 }; | |
49 | |
50 static double cost_per_card_ms_defaults[] = { | |
51 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
52 }; | |
53 | |
54 // all the same | |
4710 | 55 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 56 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
57 }; | |
58 | |
59 static double cost_per_entry_ms_defaults[] = { | |
60 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
61 }; | |
62 | |
63 static double cost_per_byte_ms_defaults[] = { | |
64 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
65 }; | |
66 | |
67 // these should be pretty consistent | |
68 static double constant_other_time_ms_defaults[] = { | |
69 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
70 }; | |
71 | |
72 | |
73 static double young_other_cost_per_region_ms_defaults[] = { | |
74 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
75 }; | |
76 | |
77 static double non_young_other_cost_per_region_ms_defaults[] = { | |
78 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
79 }; | |
80 | |
81 G1CollectorPolicy::G1CollectorPolicy() : | |
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82 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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83 ? ParallelGCThreads : 1), |
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84 |
342 | 85 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
86 _stop_world_start(0.0), | |
87 | |
88 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
89 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
90 | |
91 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
92 _prev_collection_pause_end_ms(0.0), | |
93 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
94 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 95 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
96 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 97 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 98 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 99 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
100 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
101 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
102 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
103 _non_young_other_cost_per_region_ms_seq( | |
104 new TruncatedSeq(TruncatedSeqLength)), | |
105 | |
106 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
107 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
108 | |
751 | 109 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 110 |
4710 | 111 _gcs_are_young(true), |
342 | 112 |
113 _during_marking(false), | |
114 _in_marking_window(false), | |
115 _in_marking_window_im(false), | |
116 | |
4710 | 117 _recent_prev_end_times_for_all_gcs_sec( |
118 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 119 |
120 _recent_avg_pause_time_ratio(0.0), | |
121 | |
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122 _initiate_conc_mark_if_possible(false), |
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123 _during_initial_mark_pause(false), |
4710 | 124 _last_young_gc(false), |
125 _last_gc_was_young(false), | |
342 | 126 |
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127 _eden_bytes_before_gc(0), |
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128 _survivor_bytes_before_gc(0), |
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129 _capacity_before_gc(0), |
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130 |
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131 _eden_cset_region_length(0), |
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132 _survivor_cset_region_length(0), |
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133 _old_cset_region_length(0), |
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134 |
342 | 135 _collection_set(NULL), |
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136 _collection_set_bytes_used_before(0), |
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137 |
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138 // Incremental CSet attributes |
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139 _inc_cset_build_state(Inactive), |
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140 _inc_cset_head(NULL), |
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141 _inc_cset_tail(NULL), |
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142 _inc_cset_bytes_used_before(0), |
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143 _inc_cset_max_finger(NULL), |
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144 _inc_cset_recorded_rs_lengths(0), |
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145 _inc_cset_recorded_rs_lengths_diffs(0), |
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146 _inc_cset_predicted_elapsed_time_ms(0.0), |
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147 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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148 |
342 | 149 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
150 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
151 #endif // _MSC_VER | |
152 | |
153 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
154 G1YoungSurvRateNumRegionsSummary)), | |
155 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 156 G1YoungSurvRateNumRegionsSummary)), |
342 | 157 // add here any more surv rate groups |
545 | 158 _recorded_survivor_regions(0), |
159 _recorded_survivor_head(NULL), | |
160 _recorded_survivor_tail(NULL), | |
1356 | 161 _survivors_age_table(true), |
162 | |
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163 _gc_overhead_perc(0.0) { |
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164 |
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165 // Set up the region size and associated fields. Given that the |
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166 // policy is created before the heap, we have to set this up here, |
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167 // so it's done as soon as possible. |
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168 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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169 HeapRegionRemSet::setup_remset_size(); |
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170 |
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171 G1ErgoVerbose::initialize(); |
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172 if (PrintAdaptiveSizePolicy) { |
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173 // Currently, we only use a single switch for all the heuristics. |
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174 G1ErgoVerbose::set_enabled(true); |
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175 // Given that we don't currently have a verboseness level |
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176 // parameter, we'll hardcode this to high. This can be easily |
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177 // changed in the future. |
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178 G1ErgoVerbose::set_level(ErgoHigh); |
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179 } else { |
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180 G1ErgoVerbose::set_enabled(false); |
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181 } |
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182 |
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183 // Verify PLAB sizes |
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184 const size_t region_size = HeapRegion::GrainWords; |
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185 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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186 char buffer[128]; |
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187 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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188 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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189 vm_exit_during_initialization(buffer); |
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190 } |
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191 |
342 | 192 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
193 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
194 | |
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195 _phase_times = new G1GCPhaseTimes(_parallel_gc_threads); |
342 | 196 |
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197 int index = MIN2(_parallel_gc_threads - 1, 7); |
342 | 198 |
199 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
200 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 201 _young_cards_per_entry_ratio_seq->add( |
202 young_cards_per_entry_ratio_defaults[index]); | |
342 | 203 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
204 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
205 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
206 _young_other_cost_per_region_ms_seq->add( | |
207 young_other_cost_per_region_ms_defaults[index]); | |
208 _non_young_other_cost_per_region_ms_seq->add( | |
209 non_young_other_cost_per_region_ms_defaults[index]); | |
210 | |
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211 // Below, we might need to calculate the pause time target based on |
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212 // the pause interval. When we do so we are going to give G1 maximum |
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213 // flexibility and allow it to do pauses when it needs to. So, we'll |
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214 // arrange that the pause interval to be pause time target + 1 to |
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215 // ensure that a) the pause time target is maximized with respect to |
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216 // the pause interval and b) we maintain the invariant that pause |
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217 // time target < pause interval. If the user does not want this |
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218 // maximum flexibility, they will have to set the pause interval |
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219 // explicitly. |
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220 |
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221 // First make sure that, if either parameter is set, its value is |
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222 // reasonable. |
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223 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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224 if (MaxGCPauseMillis < 1) { |
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225 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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226 "greater than 0"); |
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227 } |
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228 } |
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229 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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230 if (GCPauseIntervalMillis < 1) { |
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231 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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232 "greater than 0"); |
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233 } |
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234 } |
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235 |
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236 // Then, if the pause time target parameter was not set, set it to |
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237 // the default value. |
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238 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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239 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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240 // The default pause time target in G1 is 200ms |
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241 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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242 } else { |
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243 // We do not allow the pause interval to be set without the |
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244 // pause time target |
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245 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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246 "without setting MaxGCPauseMillis"); |
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247 } |
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248 } |
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249 |
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250 // Then, if the interval parameter was not set, set it according to |
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251 // the pause time target (this will also deal with the case when the |
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252 // pause time target is the default value). |
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253 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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254 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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255 } |
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256 |
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257 // Finally, make sure that the two parameters are consistent. |
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258 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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259 char buffer[256]; |
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260 jio_snprintf(buffer, 256, |
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261 "MaxGCPauseMillis (%u) should be less than " |
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262 "GCPauseIntervalMillis (%u)", |
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263 MaxGCPauseMillis, GCPauseIntervalMillis); |
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264 vm_exit_during_initialization(buffer); |
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265 } |
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266 |
751 | 267 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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268 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 269 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 270 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 271 |
272 // start conservatively (around 50ms is about right) | |
273 _concurrent_mark_remark_times_ms->add(0.05); | |
274 _concurrent_mark_cleanup_times_ms->add(0.20); | |
275 _tenuring_threshold = MaxTenuringThreshold; | |
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276 // _max_survivor_regions will be calculated by |
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277 // update_young_list_target_length() during initialization. |
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278 _max_survivor_regions = 0; |
545 | 279 |
1356 | 280 assert(GCTimeRatio > 0, |
281 "we should have set it to a default value set_g1_gc_flags() " | |
282 "if a user set it to 0"); | |
283 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
284 | |
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285 uintx reserve_perc = G1ReservePercent; |
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286 // Put an artificial ceiling on this so that it's not set to a silly value. |
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287 if (reserve_perc > 50) { |
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288 reserve_perc = 50; |
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289 warning("G1ReservePercent is set to a value that is too large, " |
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290 "it's been updated to %u", reserve_perc); |
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291 } |
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292 _reserve_factor = (double) reserve_perc / 100.0; |
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293 // This will be set when the heap is expanded |
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294 // for the first time during initialization. |
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295 _reserve_regions = 0; |
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296 |
342 | 297 initialize_all(); |
4013 | 298 _collectionSetChooser = new CollectionSetChooser(); |
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299 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 300 } |
301 | |
302 void G1CollectorPolicy::initialize_flags() { | |
303 set_min_alignment(HeapRegion::GrainBytes); | |
304 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
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305 if (SurvivorRatio < 1) { |
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306 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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307 } |
342 | 308 CollectorPolicy::initialize_flags(); |
309 } | |
310 | |
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311 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
7449 | 312 assert(G1NewSizePercent <= G1MaxNewSizePercent, "Min larger than max"); |
313 assert(G1NewSizePercent > 0 && G1NewSizePercent < 100, "Min out of bounds"); | |
314 assert(G1MaxNewSizePercent > 0 && G1MaxNewSizePercent < 100, "Max out of bounds"); | |
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315 |
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316 if (FLAG_IS_CMDLINE(NewRatio)) { |
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317 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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318 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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319 } else { |
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320 _sizer_kind = SizerNewRatio; |
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321 _adaptive_size = false; |
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322 return; |
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323 } |
3976 | 324 } |
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325 |
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326 if (FLAG_IS_CMDLINE(NewSize)) { |
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327 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), |
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328 1U); |
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329 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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330 _max_desired_young_length = |
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331 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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332 1U); |
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333 _sizer_kind = SizerMaxAndNewSize; |
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334 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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335 } else { |
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336 _sizer_kind = SizerNewSizeOnly; |
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337 } |
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338 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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339 _max_desired_young_length = |
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340 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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341 1U); |
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342 _sizer_kind = SizerMaxNewSizeOnly; |
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343 } |
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344 } |
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345 |
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346 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { |
7449 | 347 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100; |
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348 return MAX2(1U, default_value); |
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349 } |
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350 |
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351 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { |
7449 | 352 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100; |
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353 return MAX2(1U, default_value); |
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354 } |
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355 |
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356 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { |
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357 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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358 |
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359 switch (_sizer_kind) { |
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360 case SizerDefaults: |
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361 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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362 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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363 break; |
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364 case SizerNewSizeOnly: |
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365 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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366 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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367 break; |
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368 case SizerMaxNewSizeOnly: |
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369 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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370 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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371 break; |
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372 case SizerMaxAndNewSize: |
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373 // Do nothing. Values set on the command line, don't update them at runtime. |
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374 break; |
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375 case SizerNewRatio: |
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376 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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377 _max_desired_young_length = _min_desired_young_length; |
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378 break; |
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379 default: |
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380 ShouldNotReachHere(); |
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381 } |
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382 |
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383 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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384 } |
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385 |
342 | 386 void G1CollectorPolicy::init() { |
387 // Set aside an initial future to_space. | |
388 _g1 = G1CollectedHeap::heap(); | |
389 | |
390 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
391 | |
545 | 392 initialize_gc_policy_counters(); |
393 | |
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394 if (adaptive_young_list_length()) { |
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395 _young_list_fixed_length = 0; |
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396 } else { |
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397 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 398 } |
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399 _free_regions_at_end_of_collection = _g1->free_regions(); |
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400 update_young_list_target_length(); |
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401 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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402 |
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403 // We may immediately start allocating regions and placing them on the |
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404 // collection set list. Initialize the per-collection set info |
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405 start_incremental_cset_building(); |
342 | 406 } |
407 | |
545 | 408 // Create the jstat counters for the policy. |
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409 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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410 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 411 } |
412 | |
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413 bool G1CollectorPolicy::predict_will_fit(uint young_length, |
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414 double base_time_ms, |
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415 uint base_free_regions, |
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416 double target_pause_time_ms) { |
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417 if (young_length >= base_free_regions) { |
342 | 418 // end condition 1: not enough space for the young regions |
419 return false; | |
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420 } |
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421 |
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422 double accum_surv_rate = accum_yg_surv_rate_pred((int) young_length - 1); |
342 | 423 size_t bytes_to_copy = |
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424 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 425 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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426 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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427 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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428 if (pause_time_ms > target_pause_time_ms) { |
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429 // end condition 2: prediction is over the target pause time |
342 | 430 return false; |
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431 } |
342 | 432 |
433 size_t free_bytes = | |
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434 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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435 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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436 // end condition 3: out-of-space (conservatively!) |
342 | 437 return false; |
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438 } |
342 | 439 |
440 // success! | |
441 return true; | |
442 } | |
443 | |
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444 void G1CollectorPolicy::record_new_heap_size(uint new_number_of_regions) { |
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445 // re-calculate the necessary reserve |
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446 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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447 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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448 // smaller than 1.0) we'll get 1. |
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449 _reserve_regions = (uint) ceil(reserve_regions_d); |
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450 |
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451 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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452 } |
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453 |
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454 uint G1CollectorPolicy::calculate_young_list_desired_min_length( |
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455 uint base_min_length) { |
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456 uint desired_min_length = 0; |
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457 if (adaptive_young_list_length()) { |
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458 if (_alloc_rate_ms_seq->num() > 3) { |
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459 double now_sec = os::elapsedTime(); |
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460 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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461 double alloc_rate_ms = predict_alloc_rate_ms(); |
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462 desired_min_length = (uint) ceil(alloc_rate_ms * when_ms); |
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463 } else { |
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464 // otherwise we don't have enough info to make the prediction |
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465 } |
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466 } |
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467 desired_min_length += base_min_length; |
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468 // make sure we don't go below any user-defined minimum bound |
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469 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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470 } |
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471 |
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472 uint G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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473 // Here, we might want to also take into account any additional |
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474 // constraints (i.e., user-defined minimum bound). Currently, we |
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475 // effectively don't set this bound. |
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476 return _young_gen_sizer->max_desired_young_length(); |
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477 } |
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478 |
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479 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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480 if (rs_lengths == (size_t) -1) { |
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481 // if it's set to the default value (-1), we should predict it; |
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482 // otherwise, use the given value. |
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483 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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484 } |
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485 |
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486 // Calculate the absolute and desired min bounds. |
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487 |
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488 // This is how many young regions we already have (currently: the survivors). |
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489 uint base_min_length = recorded_survivor_regions(); |
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490 // This is the absolute minimum young length, which ensures that we |
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491 // can allocate one eden region in the worst-case. |
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492 uint absolute_min_length = base_min_length + 1; |
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493 uint desired_min_length = |
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494 calculate_young_list_desired_min_length(base_min_length); |
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495 if (desired_min_length < absolute_min_length) { |
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496 desired_min_length = absolute_min_length; |
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497 } |
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498 |
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499 // Calculate the absolute and desired max bounds. |
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500 |
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501 // We will try our best not to "eat" into the reserve. |
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502 uint absolute_max_length = 0; |
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503 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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504 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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505 } |
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506 uint desired_max_length = calculate_young_list_desired_max_length(); |
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507 if (desired_max_length > absolute_max_length) { |
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508 desired_max_length = absolute_max_length; |
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509 } |
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510 |
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511 uint young_list_target_length = 0; |
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512 if (adaptive_young_list_length()) { |
4710 | 513 if (gcs_are_young()) { |
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514 young_list_target_length = |
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515 calculate_young_list_target_length(rs_lengths, |
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516 base_min_length, |
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517 desired_min_length, |
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518 desired_max_length); |
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519 _rs_lengths_prediction = rs_lengths; |
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520 } else { |
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521 // Don't calculate anything and let the code below bound it to |
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522 // the desired_min_length, i.e., do the next GC as soon as |
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523 // possible to maximize how many old regions we can add to it. |
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524 } |
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525 } else { |
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526 // The user asked for a fixed young gen so we'll fix the young gen |
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527 // whether the next GC is young or mixed. |
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528 young_list_target_length = _young_list_fixed_length; |
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529 } |
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530 |
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531 // Make sure we don't go over the desired max length, nor under the |
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532 // desired min length. In case they clash, desired_min_length wins |
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533 // which is why that test is second. |
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534 if (young_list_target_length > desired_max_length) { |
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535 young_list_target_length = desired_max_length; |
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536 } |
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537 if (young_list_target_length < desired_min_length) { |
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538 young_list_target_length = desired_min_length; |
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539 } |
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540 |
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541 assert(young_list_target_length > recorded_survivor_regions(), |
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542 "we should be able to allocate at least one eden region"); |
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543 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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544 _young_list_target_length = young_list_target_length; |
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545 |
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546 update_max_gc_locker_expansion(); |
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547 } |
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548 |
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549 uint |
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550 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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551 uint base_min_length, |
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552 uint desired_min_length, |
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553 uint desired_max_length) { |
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554 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 555 assert(gcs_are_young(), "only call this for young GCs"); |
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556 |
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557 // In case some edge-condition makes the desired max length too small... |
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558 if (desired_max_length <= desired_min_length) { |
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559 return desired_min_length; |
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560 } |
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561 |
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562 // We'll adjust min_young_length and max_young_length not to include |
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563 // the already allocated young regions (i.e., so they reflect the |
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564 // min and max eden regions we'll allocate). The base_min_length |
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565 // will be reflected in the predictions by the |
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566 // survivor_regions_evac_time prediction. |
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567 assert(desired_min_length > base_min_length, "invariant"); |
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568 uint min_young_length = desired_min_length - base_min_length; |
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569 assert(desired_max_length > base_min_length, "invariant"); |
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570 uint max_young_length = desired_max_length - base_min_length; |
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571 |
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572 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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573 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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574 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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575 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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576 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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577 double base_time_ms = |
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578 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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579 survivor_regions_evac_time; |
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580 uint available_free_regions = _free_regions_at_end_of_collection; |
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581 uint base_free_regions = 0; |
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582 if (available_free_regions > _reserve_regions) { |
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583 base_free_regions = available_free_regions - _reserve_regions; |
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584 } |
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585 |
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586 // Here, we will make sure that the shortest young length that |
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587 // makes sense fits within the target pause time. |
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588 |
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589 if (predict_will_fit(min_young_length, base_time_ms, |
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590 base_free_regions, target_pause_time_ms)) { |
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591 // The shortest young length will fit into the target pause time; |
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592 // we'll now check whether the absolute maximum number of young |
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593 // regions will fit in the target pause time. If not, we'll do |
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594 // a binary search between min_young_length and max_young_length. |
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595 if (predict_will_fit(max_young_length, base_time_ms, |
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596 base_free_regions, target_pause_time_ms)) { |
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597 // The maximum young length will fit into the target pause time. |
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598 // We are done so set min young length to the maximum length (as |
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599 // the result is assumed to be returned in min_young_length). |
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600 min_young_length = max_young_length; |
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601 } else { |
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602 // The maximum possible number of young regions will not fit within |
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603 // the target pause time so we'll search for the optimal |
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604 // length. The loop invariants are: |
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605 // |
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606 // min_young_length < max_young_length |
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607 // min_young_length is known to fit into the target pause time |
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608 // max_young_length is known not to fit into the target pause time |
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609 // |
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610 // Going into the loop we know the above hold as we've just |
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611 // checked them. Every time around the loop we check whether |
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612 // the middle value between min_young_length and |
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613 // max_young_length fits into the target pause time. If it |
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614 // does, it becomes the new min. If it doesn't, it becomes |
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615 // the new max. This way we maintain the loop invariants. |
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616 |
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617 assert(min_young_length < max_young_length, "invariant"); |
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618 uint diff = (max_young_length - min_young_length) / 2; |
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619 while (diff > 0) { |
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620 uint young_length = min_young_length + diff; |
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621 if (predict_will_fit(young_length, base_time_ms, |
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622 base_free_regions, target_pause_time_ms)) { |
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623 min_young_length = young_length; |
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624 } else { |
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625 max_young_length = young_length; |
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626 } |
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627 assert(min_young_length < max_young_length, "invariant"); |
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628 diff = (max_young_length - min_young_length) / 2; |
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629 } |
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630 // The results is min_young_length which, according to the |
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631 // loop invariants, should fit within the target pause time. |
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632 |
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633 // These are the post-conditions of the binary search above: |
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634 assert(min_young_length < max_young_length, |
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635 "otherwise we should have discovered that max_young_length " |
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636 "fits into the pause target and not done the binary search"); |
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637 assert(predict_will_fit(min_young_length, base_time_ms, |
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638 base_free_regions, target_pause_time_ms), |
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639 "min_young_length, the result of the binary search, should " |
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640 "fit into the pause target"); |
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641 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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642 base_free_regions, target_pause_time_ms), |
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643 "min_young_length, the result of the binary search, should be " |
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644 "optimal, so no larger length should fit into the pause target"); |
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645 } |
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646 } else { |
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647 // Even the minimum length doesn't fit into the pause time |
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648 // target, return it as the result nevertheless. |
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649 } |
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650 return base_min_length + min_young_length; |
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651 } |
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652 |
545 | 653 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
654 double survivor_regions_evac_time = 0.0; | |
655 for (HeapRegion * r = _recorded_survivor_head; | |
656 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
657 r = r->get_next_young_region()) { | |
6611 | 658 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, gcs_are_young()); |
545 | 659 } |
660 return survivor_regions_evac_time; | |
661 } | |
662 | |
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663 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 664 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
665 | |
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666 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 667 if (rs_lengths > _rs_lengths_prediction) { |
668 // add 10% to avoid having to recalculate often | |
669 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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670 update_young_list_target_length(rs_lengths_prediction); |
342 | 671 } |
672 } | |
673 | |
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674 |
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675 |
342 | 676 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
677 bool is_tlab, | |
678 bool* gc_overhead_limit_was_exceeded) { | |
679 guarantee(false, "Not using this policy feature yet."); | |
680 return NULL; | |
681 } | |
682 | |
683 // This method controls how a collector handles one or more | |
684 // of its generations being fully allocated. | |
685 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
686 bool is_tlab) { | |
687 guarantee(false, "Not using this policy feature yet."); | |
688 return NULL; | |
689 } | |
690 | |
691 | |
692 #ifndef PRODUCT | |
693 bool G1CollectorPolicy::verify_young_ages() { | |
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694 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 695 return |
696 verify_young_ages(head, _short_lived_surv_rate_group); | |
697 // also call verify_young_ages on any additional surv rate groups | |
698 } | |
699 | |
700 bool | |
701 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
702 SurvRateGroup *surv_rate_group) { | |
703 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
704 | |
705 const char* name = surv_rate_group->name(); | |
706 bool ret = true; | |
707 int prev_age = -1; | |
708 | |
709 for (HeapRegion* curr = head; | |
710 curr != NULL; | |
711 curr = curr->get_next_young_region()) { | |
712 SurvRateGroup* group = curr->surv_rate_group(); | |
713 if (group == NULL && !curr->is_survivor()) { | |
714 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
715 ret = false; | |
716 } | |
717 | |
718 if (surv_rate_group == group) { | |
719 int age = curr->age_in_surv_rate_group(); | |
720 | |
721 if (age < 0) { | |
722 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
723 ret = false; | |
724 } | |
725 | |
726 if (age <= prev_age) { | |
727 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
728 "(%d, %d)", name, age, prev_age); | |
729 ret = false; | |
730 } | |
731 prev_age = age; | |
732 } | |
733 } | |
734 | |
735 return ret; | |
736 } | |
737 #endif // PRODUCT | |
738 | |
739 void G1CollectorPolicy::record_full_collection_start() { | |
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740 _full_collection_start_sec = os::elapsedTime(); |
342 | 741 // Release the future to-space so that it is available for compaction into. |
742 _g1->set_full_collection(); | |
743 } | |
744 | |
745 void G1CollectorPolicy::record_full_collection_end() { | |
746 // Consider this like a collection pause for the purposes of allocation | |
747 // since last pause. | |
748 double end_sec = os::elapsedTime(); | |
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749 double full_gc_time_sec = end_sec - _full_collection_start_sec; |
342 | 750 double full_gc_time_ms = full_gc_time_sec * 1000.0; |
751 | |
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752 _trace_gen1_time_data.record_full_collection(full_gc_time_ms); |
342 | 753 |
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754 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 755 |
756 _g1->clear_full_collection(); | |
757 | |
4710 | 758 // "Nuke" the heuristics that control the young/mixed GC |
759 // transitions and make sure we start with young GCs after the Full GC. | |
760 set_gcs_are_young(true); | |
761 _last_young_gc = false; | |
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762 clear_initiate_conc_mark_if_possible(); |
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763 clear_during_initial_mark_pause(); |
342 | 764 _in_marking_window = false; |
765 _in_marking_window_im = false; | |
766 | |
767 _short_lived_surv_rate_group->start_adding_regions(); | |
768 // also call this on any additional surv rate groups | |
769 | |
545 | 770 record_survivor_regions(0, NULL, NULL); |
771 | |
342 | 772 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 773 // Reset survivors SurvRateGroup. |
774 _survivor_surv_rate_group->reset(); | |
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775 update_young_list_target_length(); |
6011 | 776 _collectionSetChooser->clear(); |
1973 | 777 } |
342 | 778 |
779 void G1CollectorPolicy::record_stop_world_start() { | |
780 _stop_world_start = os::elapsedTime(); | |
781 } | |
782 | |
783 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
784 size_t start_used) { | |
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785 // We only need to do this here as the policy will only be applied |
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786 // to the GC we're about to start. so, no point is calculating this |
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787 // every time we calculate / recalculate the target young length. |
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788 update_survivors_policy(); |
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789 |
1973 | 790 assert(_g1->used() == _g1->recalculate_used(), |
791 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
792 _g1->used(), _g1->recalculate_used())); | |
342 | 793 |
794 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
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795 _trace_gen0_time_data.record_start_collection(s_w_t_ms); |
342 | 796 _stop_world_start = 0.0; |
797 | |
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798 phase_times()->record_cur_collection_start_sec(start_time_sec); |
342 | 799 _cur_collection_pause_used_at_start_bytes = start_used; |
800 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
801 _pending_cards = _g1->pending_card_num(); | |
802 | |
6611 | 803 _collection_set_bytes_used_before = 0; |
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804 _bytes_copied_during_gc = 0; |
342 | 805 |
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806 YoungList* young_list = _g1->young_list(); |
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807 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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808 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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809 _capacity_before_gc = _g1->capacity(); |
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810 |
4710 | 811 _last_gc_was_young = false; |
342 | 812 |
813 // do that for any other surv rate groups | |
814 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 815 _survivors_age_table.clear(); |
545 | 816 |
342 | 817 assert( verify_young_ages(), "region age verification" ); |
818 } | |
819 | |
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820 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 821 mark_init_elapsed_time_ms) { |
822 _during_marking = true; | |
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823 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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824 clear_during_initial_mark_pause(); |
342 | 825 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
826 } | |
827 | |
828 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
829 _mark_remark_start_sec = os::elapsedTime(); | |
830 _during_marking = false; | |
831 } | |
832 | |
833 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
834 double end_time_sec = os::elapsedTime(); | |
835 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
836 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
837 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
838 _prev_collection_pause_end_ms += elapsed_time_ms; | |
839 | |
840 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
841 } | |
842 | |
843 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
844 _mark_cleanup_start_sec = os::elapsedTime(); | |
845 } | |
846 | |
4013 | 847 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 848 _last_young_gc = true; |
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849 _in_marking_window = false; |
342 | 850 } |
851 | |
852 void G1CollectorPolicy::record_concurrent_pause() { | |
853 if (_stop_world_start > 0.0) { | |
854 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
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855 _trace_gen0_time_data.record_yield_time(yield_ms); |
342 | 856 } |
857 } | |
858 | |
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859 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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860 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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861 return false; |
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862 } |
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863 |
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864 size_t marking_initiating_used_threshold = |
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865 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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866 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
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867 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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868 |
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869 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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870 if (gcs_are_young()) { |
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871 ergo_verbose5(ErgoConcCycles, |
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872 "request concurrent cycle initiation", |
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|
873 ergo_format_reason("occupancy higher than threshold") |
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|
874 ergo_format_byte("occupancy") |
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875 ergo_format_byte("allocation request") |
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876 ergo_format_byte_perc("threshold") |
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|
877 ergo_format_str("source"), |
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|
878 cur_used_bytes, |
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879 alloc_byte_size, |
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|
880 marking_initiating_used_threshold, |
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881 (double) InitiatingHeapOccupancyPercent, |
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882 source); |
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883 return true; |
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|
884 } else { |
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|
885 ergo_verbose5(ErgoConcCycles, |
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|
886 "do not request concurrent cycle initiation", |
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887 ergo_format_reason("still doing mixed collections") |
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|
888 ergo_format_byte("occupancy") |
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|
889 ergo_format_byte("allocation request") |
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|
890 ergo_format_byte_perc("threshold") |
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891 ergo_format_str("source"), |
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|
892 cur_used_bytes, |
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|
893 alloc_byte_size, |
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|
894 marking_initiating_used_threshold, |
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|
895 (double) InitiatingHeapOccupancyPercent, |
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|
896 source); |
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|
897 } |
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|
898 } |
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|
899 |
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|
900 return false; |
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|
901 } |
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|
902 |
342 | 903 // Anything below that is considered to be zero |
904 #define MIN_TIMER_GRANULARITY 0.0000001 | |
905 | |
6219
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906 void G1CollectorPolicy::record_collection_pause_end(double pause_time_ms) { |
342 | 907 double end_time_sec = os::elapsedTime(); |
4090
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|
908 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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|
909 "otherwise, the subtraction below does not make sense"); |
342 | 910 size_t rs_size = |
4090
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|
911 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 912 size_t cur_used_bytes = _g1->used(); |
913 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
914 bool last_pause_included_initial_mark = false; | |
1707 | 915 bool update_stats = !_g1->evacuation_failed(); |
342 | 916 |
917 #ifndef PRODUCT | |
918 if (G1YoungSurvRateVerbose) { | |
919 gclog_or_tty->print_cr(""); | |
920 _short_lived_surv_rate_group->print(); | |
921 // do that for any other surv rate groups too | |
922 } | |
923 #endif // PRODUCT | |
924 | |
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925 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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926 if (last_pause_included_initial_mark) { |
3867
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927 record_concurrent_mark_init_end(0.0); |
4912
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928 } else if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
4829
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929 // Note: this might have already been set, if during the last |
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930 // pause we decided to start a cycle but at the beginning of |
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931 // this pause we decided to postpone it. That's OK. |
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932 set_initiate_conc_mark_if_possible(); |
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|
933 } |
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|
934 |
6219
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935 _mmu_tracker->add_pause(end_time_sec - pause_time_ms/1000.0, |
342 | 936 end_time_sec, false); |
937 | |
938 size_t freed_bytes = | |
939 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
940 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
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|
941 |
342 | 942 double survival_fraction = |
943 (double)surviving_bytes/ | |
944 (double)_collection_set_bytes_used_before; | |
945 | |
595
3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
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|
946 if (update_stats) { |
6219
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|
947 _trace_gen0_time_data.record_end_collection(pause_time_ms, phase_times()); |
342 | 948 // this is where we update the allocation rate of the application |
949 double app_time_ms = | |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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|
950 (phase_times()->cur_collection_start_sec() * 1000.0 - _prev_collection_pause_end_ms); |
342 | 951 if (app_time_ms < MIN_TIMER_GRANULARITY) { |
952 // This usually happens due to the timer not having the required | |
953 // granularity. Some Linuxes are the usual culprits. | |
954 // We'll just set it to something (arbitrarily) small. | |
955 app_time_ms = 1.0; | |
956 } | |
4090
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957 // We maintain the invariant that all objects allocated by mutator |
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958 // threads will be allocated out of eden regions. So, we can use |
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959 // the eden region number allocated since the previous GC to |
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|
960 // calculate the application's allocate rate. The only exception |
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|
961 // to that is humongous objects that are allocated separately. But |
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|
962 // given that humongous object allocations do not really affect |
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|
963 // either the pause's duration nor when the next pause will take |
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|
964 // place we can safely ignore them here. |
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
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|
965 uint regions_allocated = eden_cset_region_length(); |
342 | 966 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
967 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
968 | |
969 double interval_ms = | |
970 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
6219
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|
971 update_recent_gc_times(end_time_sec, pause_time_ms); |
342 | 972 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
1086
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|
973 if (recent_avg_pause_time_ratio() < 0.0 || |
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974 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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|
975 #ifndef PRODUCT |
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|
976 // Dump info to allow post-facto debugging |
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
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|
977 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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|
978 gclog_or_tty->print_cr("-------------------------------------------"); |
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|
979 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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|
980 _recent_gc_times_ms->dump(); |
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|
981 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
89f1b9ae8991
6898948: G1: forensic instrumentation for out-of-bounds recent_avg_pause_time_ratio()
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|
982 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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|
983 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
89f1b9ae8991
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|
984 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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6902701: G1: protect debugging code related to 6898948 with a debug flag
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diff
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|
985 // In debug mode, terminate the JVM if the user wants to debug at this point. |
23b9a8d315fc
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|
986 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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|
987 #endif // !PRODUCT |
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|
988 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
23b9a8d315fc
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|
989 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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|
990 if (_recent_avg_pause_time_ratio < 0.0) { |
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|
991 _recent_avg_pause_time_ratio = 0.0; |
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|
992 } else { |
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|
993 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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|
994 _recent_avg_pause_time_ratio = 1.0; |
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|
995 } |
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|
996 } |
342 | 997 } |
998 bool new_in_marking_window = _in_marking_window; | |
999 bool new_in_marking_window_im = false; | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
1000 if (during_initial_mark_pause()) { |
342 | 1001 new_in_marking_window = true; |
1002 new_in_marking_window_im = true; | |
1003 } | |
1004 | |
4710 | 1005 if (_last_young_gc) { |
4912
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|
1006 // This is supposed to to be the "last young GC" before we start |
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|
1007 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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|
1008 |
3982
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|
1009 if (!last_pause_included_initial_mark) { |
4912
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1010 if (next_gc_should_be_mixed("start mixed GCs", |
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1011 "do not start mixed GCs")) { |
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1012 set_gcs_are_young(false); |
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|
1013 } |
3982
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diff
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|
1014 } else { |
4710 | 1015 ergo_verbose0(ErgoMixedGCs, |
1016 "do not start mixed GCs", | |
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1017 ergo_format_reason("concurrent cycle is about to start")); |
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1018 } |
4710 | 1019 _last_young_gc = false; |
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1020 } |
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1021 |
4710 | 1022 if (!_last_gc_was_young) { |
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1023 // This is a mixed GC. Here we decide whether to continue doing |
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1024 // mixed GCs or not. |
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1025 |
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1026 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1027 "do not continue mixed GCs")) { |
4710 | 1028 set_gcs_are_young(true); |
342 | 1029 } |
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1030 } |
4710 | 1031 |
342 | 1032 _short_lived_surv_rate_group->start_adding_regions(); |
1033 // do that for any other surv rate groupsx | |
1034 | |
677 | 1035 if (update_stats) { |
342 | 1036 double cost_per_card_ms = 0.0; |
1037 if (_pending_cards > 0) { | |
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1038 cost_per_card_ms = phase_times()->average_last_update_rs_time() / (double) _pending_cards; |
342 | 1039 _cost_per_card_ms_seq->add(cost_per_card_ms); |
1040 } | |
1041 | |
1042 size_t cards_scanned = _g1->cards_scanned(); | |
1043 | |
1044 double cost_per_entry_ms = 0.0; | |
1045 if (cards_scanned > 10) { | |
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1046 cost_per_entry_ms = phase_times()->average_last_scan_rs_time() / (double) cards_scanned; |
4710 | 1047 if (_last_gc_was_young) { |
342 | 1048 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1049 } else { |
1050 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1051 } | |
342 | 1052 } |
1053 | |
1054 if (_max_rs_lengths > 0) { | |
1055 double cards_per_entry_ratio = | |
1056 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1057 if (_last_gc_was_young) { |
1058 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1059 } else { | |
1060 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1061 } | |
342 | 1062 } |
1063 | |
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1064 // This is defensive. For a while _max_rs_lengths could get |
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1065 // smaller than _recorded_rs_lengths which was causing |
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1066 // rs_length_diff to get very large and mess up the RSet length |
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1067 // predictions. The reason was unsafe concurrent updates to the |
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1068 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1069 // against (see CR 7118202). This bug has now been fixed (see CR |
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1070 // 7119027). However, I'm still worried that |
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1071 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1072 // inaccurate. The concurrent refinement thread calculates an |
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1073 // RSet's length concurrently with other CR threads updating it |
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1074 // which might cause it to calculate the length incorrectly (if, |
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1075 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1076 // conditional below just in case. |
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1077 size_t rs_length_diff = 0; |
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1078 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1079 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1080 } |
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1081 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1082 |
1083 size_t copied_bytes = surviving_bytes; | |
1084 double cost_per_byte_ms = 0.0; | |
1085 if (copied_bytes > 0) { | |
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1086 cost_per_byte_ms = phase_times()->average_last_obj_copy_time() / (double) copied_bytes; |
4710 | 1087 if (_in_marking_window) { |
342 | 1088 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1089 } else { |
342 | 1090 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1091 } |
342 | 1092 } |
1093 | |
1094 double all_other_time_ms = pause_time_ms - | |
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1095 (phase_times()->average_last_update_rs_time() + phase_times()->average_last_scan_rs_time() |
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1096 + phase_times()->average_last_obj_copy_time() + phase_times()->average_last_termination_time()); |
342 | 1097 |
1098 double young_other_time_ms = 0.0; | |
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1099 if (young_cset_region_length() > 0) { |
342 | 1100 young_other_time_ms = |
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1101 phase_times()->young_cset_choice_time_ms() + |
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1102 phase_times()->young_free_cset_time_ms(); |
342 | 1103 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
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1104 (double) young_cset_region_length()); |
342 | 1105 } |
1106 double non_young_other_time_ms = 0.0; | |
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1107 if (old_cset_region_length() > 0) { |
342 | 1108 non_young_other_time_ms = |
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1109 phase_times()->non_young_cset_choice_time_ms() + |
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1110 phase_times()->non_young_free_cset_time_ms(); |
342 | 1111 |
1112 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1113 (double) old_cset_region_length()); |
342 | 1114 } |
1115 | |
1116 double constant_other_time_ms = all_other_time_ms - | |
1117 (young_other_time_ms + non_young_other_time_ms); | |
1118 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1119 | |
1120 double survival_ratio = 0.0; | |
6611 | 1121 if (_collection_set_bytes_used_before > 0) { |
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1122 survival_ratio = (double) _bytes_copied_during_gc / |
6611 | 1123 (double) _collection_set_bytes_used_before; |
342 | 1124 } |
1125 | |
1126 _pending_cards_seq->add((double) _pending_cards); | |
1127 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1128 } | |
1129 | |
1130 _in_marking_window = new_in_marking_window; | |
1131 _in_marking_window_im = new_in_marking_window_im; | |
1132 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1133 update_young_list_target_length(); |
342 | 1134 |
1111 | 1135 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1136 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
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1137 adjust_concurrent_refinement(phase_times()->average_last_update_rs_time(), |
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1138 phase_times()->sum_last_update_rs_processed_buffers(), update_rs_time_goal_ms); |
4013 | 1139 |
6011 | 1140 _collectionSetChooser->verify(); |
342 | 1141 } |
1142 | |
6059 | 1143 #define EXT_SIZE_FORMAT "%.1f%s" |
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1144 #define EXT_SIZE_PARAMS(bytes) \ |
6059 | 1145 byte_size_in_proper_unit((double)(bytes)), \ |
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1146 proper_unit_for_byte_size((bytes)) |
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1147 |
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1148 void G1CollectorPolicy::print_heap_transition() { |
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1149 _g1->print_size_transition(gclog_or_tty, |
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1150 _cur_collection_pause_used_at_start_bytes, _g1->used(), _g1->capacity()); |
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1151 } |
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1152 |
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1153 void G1CollectorPolicy::print_detailed_heap_transition() { |
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1154 YoungList* young_list = _g1->young_list(); |
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1155 size_t eden_bytes = young_list->eden_used_bytes(); |
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1156 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1157 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1158 size_t used = _g1->used(); |
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1159 size_t capacity = _g1->capacity(); |
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1160 size_t eden_capacity = |
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1161 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1162 |
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1163 gclog_or_tty->print_cr( |
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1164 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1165 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1166 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1167 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1168 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1169 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1170 EXT_SIZE_PARAMS(eden_bytes), |
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1171 EXT_SIZE_PARAMS(eden_capacity), |
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1172 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1173 EXT_SIZE_PARAMS(survivor_bytes), |
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1174 EXT_SIZE_PARAMS(used_before_gc), |
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1175 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1176 EXT_SIZE_PARAMS(used), |
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1177 EXT_SIZE_PARAMS(capacity)); |
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1178 |
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1179 _prev_eden_capacity = eden_capacity; |
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1180 } |
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1181 |
1111 | 1182 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1183 double update_rs_processed_buffers, | |
1184 double goal_ms) { | |
1185 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1186 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1187 | |
1282 | 1188 if (G1UseAdaptiveConcRefinement) { |
1111 | 1189 const int k_gy = 3, k_gr = 6; |
1190 const double inc_k = 1.1, dec_k = 0.9; | |
1191 | |
1192 int g = cg1r->green_zone(); | |
1193 if (update_rs_time > goal_ms) { | |
1194 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1195 } else { | |
1196 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1197 g = (int)MAX2(g * inc_k, g + 1.0); | |
1198 } | |
1199 } | |
1200 // Change the refinement threads params | |
1201 cg1r->set_green_zone(g); | |
1202 cg1r->set_yellow_zone(g * k_gy); | |
1203 cg1r->set_red_zone(g * k_gr); | |
1204 cg1r->reinitialize_threads(); | |
1205 | |
1206 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1207 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1208 cg1r->yellow_zone()); | |
1209 // Change the barrier params | |
1210 dcqs.set_process_completed_threshold(processing_threshold); | |
1211 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1212 } | |
1213 | |
1214 int curr_queue_size = dcqs.completed_buffers_num(); | |
1215 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1216 dcqs.set_completed_queue_padding(curr_queue_size); | |
1217 } else { | |
1218 dcqs.set_completed_queue_padding(0); | |
1219 } | |
1220 dcqs.notify_if_necessary(); | |
1221 } | |
1222 | |
342 | 1223 double |
1224 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1225 size_t scanned_cards) { | |
1226 return | |
1227 predict_rs_update_time_ms(pending_cards) + | |
1228 predict_rs_scan_time_ms(scanned_cards) + | |
1229 predict_constant_other_time_ms(); | |
1230 } | |
1231 | |
1232 double | |
6611 | 1233 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { |
1234 size_t rs_length = predict_rs_length_diff(); | |
342 | 1235 size_t card_num; |
4710 | 1236 if (gcs_are_young()) { |
342 | 1237 card_num = predict_young_card_num(rs_length); |
4710 | 1238 } else { |
342 | 1239 card_num = predict_non_young_card_num(rs_length); |
4710 | 1240 } |
6611 | 1241 return predict_base_elapsed_time_ms(pending_cards, card_num); |
342 | 1242 } |
1243 | |
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1244 size_t G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
342 | 1245 size_t bytes_to_copy; |
1246 if (hr->is_marked()) | |
1247 bytes_to_copy = hr->max_live_bytes(); | |
1248 else { | |
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1249 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1250 int age = hr->age_in_surv_rate_group(); |
545 | 1251 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1252 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1253 } | |
1254 return bytes_to_copy; | |
1255 } | |
1256 | |
6611 | 1257 double |
1258 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1259 bool for_young_gc) { | |
1260 size_t rs_length = hr->rem_set()->occupied(); | |
1261 size_t card_num; | |
1262 | |
1263 // Predicting the number of cards is based on which type of GC | |
1264 // we're predicting for. | |
1265 if (for_young_gc) { | |
1266 card_num = predict_young_card_num(rs_length); | |
1267 } else { | |
1268 card_num = predict_non_young_card_num(rs_length); | |
1269 } | |
1270 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1271 | |
1272 double region_elapsed_time_ms = | |
1273 predict_rs_scan_time_ms(card_num) + | |
1274 predict_object_copy_time_ms(bytes_to_copy); | |
1275 | |
1276 // The prediction of the "other" time for this region is based | |
1277 // upon the region type and NOT the GC type. | |
1278 if (hr->is_young()) { | |
1279 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1280 } else { | |
1281 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1282 } | |
1283 return region_elapsed_time_ms; | |
1284 } | |
1285 | |
342 | 1286 void |
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1287 G1CollectorPolicy::init_cset_region_lengths(uint eden_cset_region_length, |
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1288 uint survivor_cset_region_length) { |
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1289 _eden_cset_region_length = eden_cset_region_length; |
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1290 _survivor_cset_region_length = survivor_cset_region_length; |
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1291 _old_cset_region_length = 0; |
1394
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1292 } |
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1293 |
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1294 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1295 _recorded_rs_lengths = rs_lengths; |
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1296 } |
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1297 |
342 | 1298 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1299 double elapsed_ms) { | |
1300 _recent_gc_times_ms->add(elapsed_ms); | |
1301 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1302 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1303 } | |
1304 | |
1305 size_t G1CollectorPolicy::expansion_amount() { | |
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1306 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1307 double threshold = _gc_overhead_perc; |
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1308 if (recent_gc_overhead > threshold) { |
751 | 1309 // We will double the existing space, or take |
1310 // G1ExpandByPercentOfAvailable % of the available expansion | |
1311 // space, whichever is smaller, bounded below by a minimum | |
1312 // expansion (unless that's all that's left.) | |
342 | 1313 const size_t min_expand_bytes = 1*M; |
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1314 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1315 size_t committed_bytes = _g1->capacity(); |
1316 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1317 size_t expand_bytes; | |
1318 size_t expand_bytes_via_pct = | |
751 | 1319 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1320 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1321 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1322 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1323 |
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1324 ergo_verbose5(ErgoHeapSizing, |
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1325 "attempt heap expansion", |
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1326 ergo_format_reason("recent GC overhead higher than " |
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1327 "threshold after GC") |
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1328 ergo_format_perc("recent GC overhead") |
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1329 ergo_format_perc("threshold") |
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1330 ergo_format_byte("uncommitted") |
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1331 ergo_format_byte_perc("calculated expansion amount"), |
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1332 recent_gc_overhead, threshold, |
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1333 uncommitted_bytes, |
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1334 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1335 |
342 | 1336 return expand_bytes; |
1337 } else { | |
1338 return 0; | |
1339 } | |
1340 } | |
1341 | |
1342 void G1CollectorPolicy::print_tracing_info() const { | |
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1343 _trace_gen0_time_data.print(); |
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1344 _trace_gen1_time_data.print(); |
342 | 1345 } |
1346 | |
1347 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
1348 #ifndef PRODUCT | |
1349 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
1350 // add this call for any other surv rate groups | |
1351 #endif // PRODUCT | |
1352 } | |
1353 | |
1354 #ifndef PRODUCT | |
1355 // for debugging, bit of a hack... | |
1356 static char* | |
1357 region_num_to_mbs(int length) { | |
1358 static char buffer[64]; | |
1359 double bytes = (double) (length * HeapRegion::GrainBytes); | |
1360 double mbs = bytes / (double) (1024 * 1024); | |
1361 sprintf(buffer, "%7.2lfMB", mbs); | |
1362 return buffer; | |
1363 } | |
1364 #endif // PRODUCT | |
1365 | |
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1366 uint G1CollectorPolicy::max_regions(int purpose) { |
342 | 1367 switch (purpose) { |
1368 case GCAllocForSurvived: | |
545 | 1369 return _max_survivor_regions; |
342 | 1370 case GCAllocForTenured: |
545 | 1371 return REGIONS_UNLIMITED; |
342 | 1372 default: |
545 | 1373 ShouldNotReachHere(); |
1374 return REGIONS_UNLIMITED; | |
342 | 1375 }; |
1376 } | |
1377 | |
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1378 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
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1379 uint expansion_region_num = 0; |
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1380 if (GCLockerEdenExpansionPercent > 0) { |
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1381 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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1382 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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1383 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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1384 // less than 1.0) we'll get 1. |
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1385 expansion_region_num = (uint) ceil(expansion_region_num_d); |
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1386 } else { |
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1387 assert(expansion_region_num == 0, "sanity"); |
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1388 } |
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1389 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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1390 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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1391 } |
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1392 |
545 | 1393 // Calculates survivor space parameters. |
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1394 void G1CollectorPolicy::update_survivors_policy() { |
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1395 double max_survivor_regions_d = |
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1396 (double) _young_list_target_length / (double) SurvivorRatio; |
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1397 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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1398 // smaller than 1.0) we'll get 1. |
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1399 _max_survivor_regions = (uint) ceil(max_survivor_regions_d); |
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1400 |
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1401 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 1402 HeapRegion::GrainWords * _max_survivor_regions); |
1403 } | |
1404 | |
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1405 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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1406 GCCause::Cause gc_cause) { |
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1407 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1408 if (!during_cycle) { |
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1409 ergo_verbose1(ErgoConcCycles, |
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1410 "request concurrent cycle initiation", |
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1411 ergo_format_reason("requested by GC cause") |
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1412 ergo_format_str("GC cause"), |
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1413 GCCause::to_string(gc_cause)); |
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1414 set_initiate_conc_mark_if_possible(); |
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1415 return true; |
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1416 } else { |
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1417 ergo_verbose1(ErgoConcCycles, |
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1418 "do not request concurrent cycle initiation", |
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1419 ergo_format_reason("concurrent cycle already in progress") |
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1420 ergo_format_str("GC cause"), |
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1421 GCCause::to_string(gc_cause)); |
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1422 return false; |
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1423 } |
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1424 } |
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1425 |
342 | 1426 void |
1359
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1427 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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1428 // We are about to decide on whether this pause will be an |
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1429 // initial-mark pause. |
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1430 |
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1431 // First, during_initial_mark_pause() should not be already set. We |
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1432 // will set it here if we have to. However, it should be cleared by |
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1433 // the end of the pause (it's only set for the duration of an |
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1434 // initial-mark pause). |
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1435 assert(!during_initial_mark_pause(), "pre-condition"); |
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1436 |
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1437 if (initiate_conc_mark_if_possible()) { |
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1438 // We had noticed on a previous pause that the heap occupancy has |
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1439 // gone over the initiating threshold and we should start a |
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1440 // concurrent marking cycle. So we might initiate one. |
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1441 |
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1442 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1443 if (!during_cycle) { |
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1444 // The concurrent marking thread is not "during a cycle", i.e., |
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1445 // it has completed the last one. So we can go ahead and |
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1446 // initiate a new cycle. |
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1447 |
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1448 set_during_initial_mark_pause(); |
4710 | 1449 // We do not allow mixed GCs during marking. |
1450 if (!gcs_are_young()) { | |
1451 set_gcs_are_young(true); | |
1452 ergo_verbose0(ErgoMixedGCs, | |
1453 "end mixed GCs", | |
3982
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1454 ergo_format_reason("concurrent cycle is about to start")); |
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1455 } |
1359
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1456 |
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1457 // And we can now clear initiate_conc_mark_if_possible() as |
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1458 // we've already acted on it. |
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1459 clear_initiate_conc_mark_if_possible(); |
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1460 |
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1461 ergo_verbose0(ErgoConcCycles, |
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1462 "initiate concurrent cycle", |
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1463 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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1464 } else { |
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1465 // The concurrent marking thread is still finishing up the |
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1466 // previous cycle. If we start one right now the two cycles |
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1467 // overlap. In particular, the concurrent marking thread might |
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1468 // be in the process of clearing the next marking bitmap (which |
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1469 // we will use for the next cycle if we start one). Starting a |
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1470 // cycle now will be bad given that parts of the marking |
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1471 // information might get cleared by the marking thread. And we |
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1472 // cannot wait for the marking thread to finish the cycle as it |
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1473 // periodically yields while clearing the next marking bitmap |
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1474 // and, if it's in a yield point, it's waiting for us to |
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1475 // finish. So, at this point we will not start a cycle and we'll |
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1476 // let the concurrent marking thread complete the last one. |
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1477 ergo_verbose0(ErgoConcCycles, |
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1478 "do not initiate concurrent cycle", |
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1479 ergo_format_reason("concurrent cycle already in progress")); |
1359
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1480 } |
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1481 } |
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1482 } |
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1483 |
342 | 1484 class KnownGarbageClosure: public HeapRegionClosure { |
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1485 G1CollectedHeap* _g1h; |
342 | 1486 CollectionSetChooser* _hrSorted; |
1487 | |
1488 public: | |
1489 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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1490 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 1491 |
1492 bool doHeapRegion(HeapRegion* r) { | |
1493 // We only include humongous regions in collection | |
1494 // sets when concurrent mark shows that their contained object is | |
1495 // unreachable. | |
1496 | |
1497 // Do we have any marking information for this region? | |
1498 if (r->is_marked()) { | |
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1499 // We will skip any region that's currently used as an old GC |
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1500 // alloc region (we should not consider those for collection |
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1501 // before we fill them up). |
6011 | 1502 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
1503 _hrSorted->add_region(r); | |
342 | 1504 } |
1505 } | |
1506 return false; | |
1507 } | |
1508 }; | |
1509 | |
1510 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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1511 G1CollectedHeap* _g1h; |
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1512 CSetChooserParUpdater _cset_updater; |
342 | 1513 |
1514 public: | |
1515 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
6011 | 1516 uint chunk_size) : |
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1517 _g1h(G1CollectedHeap::heap()), |
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1518 _cset_updater(hrSorted, true /* parallel */, chunk_size) { } |
342 | 1519 |
1520 bool doHeapRegion(HeapRegion* r) { | |
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). |
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1526 if (_cset_updater.should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
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1527 _cset_updater.add_region(r); |
342 | 1528 } |
1529 } | |
1530 return false; | |
1531 } | |
1532 }; | |
1533 | |
1534 class ParKnownGarbageTask: public AbstractGangTask { | |
1535 CollectionSetChooser* _hrSorted; | |
6011 | 1536 uint _chunk_size; |
342 | 1537 G1CollectedHeap* _g1; |
1538 public: | |
6011 | 1539 ParKnownGarbageTask(CollectionSetChooser* hrSorted, uint chunk_size) : |
342 | 1540 AbstractGangTask("ParKnownGarbageTask"), |
1541 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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1542 _g1(G1CollectedHeap::heap()) { } |
342 | 1543 |
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1544 void work(uint worker_id) { |
6011 | 1545 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size); |
1546 | |
342 | 1547 // Back to zero for the claim value. |
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1548 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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1549 _g1->workers()->active_workers(), |
355 | 1550 HeapRegion::InitialClaimValue); |
342 | 1551 } |
1552 }; | |
1553 | |
1554 void | |
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1555 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
6011 | 1556 _collectionSetChooser->clear(); |
4013 | 1557 |
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1558 uint region_num = _g1->n_regions(); |
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1559 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1560 const uint OverpartitionFactor = 4; |
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1561 uint WorkUnit; |
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1562 // The use of MinChunkSize = 8 in the original code |
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1563 // causes some assertion failures when the total number of |
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1564 // region is less than 8. The code here tries to fix that. |
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1565 // Should the original code also be fixed? |
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1566 if (no_of_gc_threads > 0) { |
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1567 const uint MinWorkUnit = MAX2(region_num / no_of_gc_threads, 1U); |
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1568 WorkUnit = MAX2(region_num / (no_of_gc_threads * OverpartitionFactor), |
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1569 MinWorkUnit); |
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1570 } else { |
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1571 assert(no_of_gc_threads > 0, |
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1572 "The active gc workers should be greater than 0"); |
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1573 // In a product build do something reasonable to avoid a crash. |
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1574 const uint MinWorkUnit = MAX2(region_num / (uint) ParallelGCThreads, 1U); |
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1575 WorkUnit = |
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1576 MAX2(region_num / (uint) (ParallelGCThreads * OverpartitionFactor), |
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1577 MinWorkUnit); |
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1578 } |
6011 | 1579 _collectionSetChooser->prepare_for_par_region_addition(_g1->n_regions(), |
1580 WorkUnit); | |
342 | 1581 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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1582 (int) WorkUnit); |
342 | 1583 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 1584 |
1585 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
1586 "sanity check"); | |
342 | 1587 } else { |
1588 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
1589 _g1->heap_region_iterate(&knownGarbagecl); | |
1590 } | |
4013 | 1591 |
6011 | 1592 _collectionSetChooser->sort_regions(); |
1593 | |
4013 | 1594 double end_sec = os::elapsedTime(); |
1595 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; | |
1596 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1597 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1598 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1599 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 1600 } |
1601 | |
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1602 // Add the heap region at the head of the non-incremental collection set |
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1603 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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1604 assert(_inc_cset_build_state == Active, "Precondition"); |
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1605 assert(!hr->is_young(), "non-incremental add of young region"); |
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1606 |
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1607 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 1608 hr->set_in_collection_set(true); |
1609 hr->set_next_in_collection_set(_collection_set); | |
1610 _collection_set = hr; | |
1611 _collection_set_bytes_used_before += hr->used(); | |
526 | 1612 _g1->register_region_with_in_cset_fast_test(hr); |
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1613 size_t rs_length = hr->rem_set()->occupied(); |
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1614 _recorded_rs_lengths += rs_length; |
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1615 _old_cset_region_length += 1; |
342 | 1616 } |
1617 | |
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1618 // Initialize the per-collection-set information |
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1619 void G1CollectorPolicy::start_incremental_cset_building() { |
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1620 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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1621 |
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1622 _inc_cset_head = NULL; |
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1623 _inc_cset_tail = NULL; |
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1624 _inc_cset_bytes_used_before = 0; |
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1625 |
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1626 _inc_cset_max_finger = 0; |
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1627 _inc_cset_recorded_rs_lengths = 0; |
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1628 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1629 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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1630 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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1631 _inc_cset_build_state = Active; |
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1632 } |
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1633 |
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1634 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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1635 assert(_inc_cset_build_state == Active, "Precondition"); |
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1636 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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1637 |
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1638 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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1639 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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1640 // that adds a new region to the CSet. Further updates by the |
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1641 // concurrent refinement thread that samples the young RSet lengths |
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1642 // are accumulated in the *_diffs fields. Here we add the diffs to |
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1643 // the "main" fields. |
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1644 |
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1645 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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1646 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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1647 } else { |
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1648 // This is defensive. The diff should in theory be always positive |
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1649 // as RSets can only grow between GCs. However, given that we |
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1650 // sample their size concurrently with other threads updating them |
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1651 // it's possible that we might get the wrong size back, which |
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1652 // could make the calculations somewhat inaccurate. |
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1653 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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1654 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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1655 _inc_cset_recorded_rs_lengths -= diffs; |
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1656 } else { |
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1657 _inc_cset_recorded_rs_lengths = 0; |
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1658 } |
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1659 } |
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1660 _inc_cset_predicted_elapsed_time_ms += |
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1661 _inc_cset_predicted_elapsed_time_ms_diffs; |
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1662 |
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1663 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1664 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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1665 } |
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1666 |
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1667 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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1668 // This routine is used when: |
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1669 // * adding survivor regions to the incremental cset at the end of an |
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1670 // evacuation pause, |
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1671 // * adding the current allocation region to the incremental cset |
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1672 // when it is retired, and |
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1673 // * updating existing policy information for a region in the |
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1674 // incremental cset via young list RSet sampling. |
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1675 // Therefore this routine may be called at a safepoint by the |
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1676 // VM thread, or in-between safepoints by mutator threads (when |
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1677 // retiring the current allocation region) or a concurrent |
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1678 // refine thread (RSet sampling). |
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1679 |
6611 | 1680 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
1394
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1681 size_t used_bytes = hr->used(); |
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1682 _inc_cset_recorded_rs_lengths += rs_length; |
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1683 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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1684 _inc_cset_bytes_used_before += used_bytes; |
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1685 |
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1686 // Cache the values we have added to the aggregated informtion |
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1687 // in the heap region in case we have to remove this region from |
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1688 // the incremental collection set, or it is updated by the |
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1689 // rset sampling code |
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1690 hr->set_recorded_rs_length(rs_length); |
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1691 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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1692 } |
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1693 |
4727
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1694 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
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1695 size_t new_rs_length) { |
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1696 // Update the CSet information that is dependent on the new RS length |
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1697 assert(hr->is_young(), "Precondition"); |
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1698 assert(!SafepointSynchronize::is_at_safepoint(), |
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1699 "should not be at a safepoint"); |
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1700 |
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1701 // We could have updated _inc_cset_recorded_rs_lengths and |
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1702 // _inc_cset_predicted_elapsed_time_ms directly but we'd need to do |
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1703 // that atomically, as this code is executed by a concurrent |
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1704 // refinement thread, potentially concurrently with a mutator thread |
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1705 // allocating a new region and also updating the same fields. To |
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1706 // avoid the atomic operations we accumulate these updates on two |
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1707 // separate fields (*_diffs) and we'll just add them to the "main" |
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1708 // fields at the start of a GC. |
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1709 |
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1710 ssize_t old_rs_length = (ssize_t) hr->recorded_rs_length(); |
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1711 ssize_t rs_lengths_diff = (ssize_t) new_rs_length - old_rs_length; |
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1712 _inc_cset_recorded_rs_lengths_diffs += rs_lengths_diff; |
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1713 |
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1714 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
6611 | 1715 double new_region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
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1716 double elapsed_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms; |
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1717 _inc_cset_predicted_elapsed_time_ms_diffs += elapsed_ms_diff; |
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1718 |
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1719 hr->set_recorded_rs_length(new_rs_length); |
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1720 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
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1721 } |
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1722 |
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1723 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
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1724 assert(hr->is_young(), "invariant"); |
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1725 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
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1726 assert(_inc_cset_build_state == Active, "Precondition"); |
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1727 |
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1728 // We need to clear and set the cached recorded/cached collection set |
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1729 // information in the heap region here (before the region gets added |
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|
1730 // to the collection set). An individual heap region's cached values |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1731 // are calculated, aggregated with the policy collection set info, |
1316cec51b4d
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|
1732 // and cached in the heap region here (initially) and (subsequently) |
1316cec51b4d
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|
1733 // by the Young List sampling code. |
1316cec51b4d
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|
1734 |
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|
1735 size_t rs_length = hr->rem_set()->occupied(); |
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|
1736 add_to_incremental_cset_info(hr, rs_length); |
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|
1737 |
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|
1738 HeapWord* hr_end = hr->end(); |
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|
1739 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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|
1740 |
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|
1741 assert(!hr->in_collection_set(), "invariant"); |
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|
1742 hr->set_in_collection_set(true); |
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|
1743 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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|
1744 |
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|
1745 _g1->register_region_with_in_cset_fast_test(hr); |
1316cec51b4d
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|
1746 } |
1316cec51b4d
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diff
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|
1747 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1748 // Add the region at the RHS of the incremental cset |
1316cec51b4d
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|
1749 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1750 // We should only ever be appending survivors at the end of a pause |
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|
1751 assert( hr->is_survivor(), "Logic"); |
1316cec51b4d
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|
1752 |
1316cec51b4d
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|
1753 // Do the 'common' stuff |
1316cec51b4d
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|
1754 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1755 |
1316cec51b4d
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|
1756 // Now add the region at the right hand side |
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|
1757 if (_inc_cset_tail == NULL) { |
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|
1758 assert(_inc_cset_head == NULL, "invariant"); |
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|
1759 _inc_cset_head = hr; |
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|
1760 } else { |
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|
1761 _inc_cset_tail->set_next_in_collection_set(hr); |
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|
1762 } |
1316cec51b4d
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|
1763 _inc_cset_tail = hr; |
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|
1764 } |
1316cec51b4d
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diff
changeset
|
1765 |
1316cec51b4d
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diff
changeset
|
1766 // Add the region to the LHS of the incremental cset |
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|
1767 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
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|
1768 // Survivors should be added to the RHS at the end of a pause |
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|
1769 assert(!hr->is_survivor(), "Logic"); |
1316cec51b4d
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diff
changeset
|
1770 |
1316cec51b4d
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diff
changeset
|
1771 // Do the 'common' stuff |
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|
1772 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1773 |
1316cec51b4d
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diff
changeset
|
1774 // Add the region at the left hand side |
1316cec51b4d
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|
1775 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1776 if (_inc_cset_head == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1777 assert(_inc_cset_tail == NULL, "Invariant"); |
1316cec51b4d
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diff
changeset
|
1778 _inc_cset_tail = hr; |
1316cec51b4d
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parents:
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diff
changeset
|
1779 } |
1316cec51b4d
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parents:
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diff
changeset
|
1780 _inc_cset_head = hr; |
1316cec51b4d
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diff
changeset
|
1781 } |
1316cec51b4d
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parents:
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diff
changeset
|
1782 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
1783 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1784 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1785 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1786 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1787 st->print_cr("\nCollection_set:"); |
1316cec51b4d
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diff
changeset
|
1788 HeapRegion* csr = list_head; |
1316cec51b4d
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diff
changeset
|
1789 while (csr != NULL) { |
1316cec51b4d
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parents:
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diff
changeset
|
1790 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
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parents:
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diff
changeset
|
1791 assert(csr->in_collection_set(), "bad CS"); |
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1792 st->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1793 HR_FORMAT_PARAMS(csr), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1794 csr->prev_top_at_mark_start(), csr->next_top_at_mark_start(), |
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1795 csr->age_in_surv_rate_group_cond()); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
1796 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
1797 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1798 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
1799 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
1800 |
4912
a9647476d1a4
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diff
changeset
|
1801 bool G1CollectorPolicy::next_gc_should_be_mixed(const char* true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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|
1802 const char* false_action_str) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1803 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1804 if (cset_chooser->is_empty()) { |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1805 ergo_verbose0(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1806 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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4837
diff
changeset
|
1807 ergo_format_reason("candidate old regions not available")); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1808 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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diff
changeset
|
1809 } |
6011 | 1810 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1811 size_t capacity_bytes = _g1->capacity(); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1812 double perc = (double) reclaimable_bytes * 100.0 / (double) capacity_bytes; |
5964
21595f05bc93
7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs
tonyp
parents:
4912
diff
changeset
|
1813 double threshold = (double) G1HeapWastePercent; |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
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|
1814 if (perc < threshold) { |
a9647476d1a4
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diff
changeset
|
1815 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1816 false_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1817 ergo_format_reason("reclaimable percentage lower than threshold") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1818 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
1819 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
1820 ergo_format_perc("threshold"), |
6011 | 1821 cset_chooser->remaining_regions(), |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1822 reclaimable_bytes, perc, threshold); |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1823 return false; |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
1824 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1825 |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1826 ergo_verbose4(ErgoMixedGCs, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1827 true_action_str, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
diff
changeset
|
1828 ergo_format_reason("candidate old regions available") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1829 ergo_format_region("candidate old regions") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
1830 ergo_format_byte_perc("reclaimable") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
diff
changeset
|
1831 ergo_format_perc("threshold"), |
6011 | 1832 cset_chooser->remaining_regions(), |
4912
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diff
changeset
|
1833 reclaimable_bytes, perc, threshold); |
a9647476d1a4
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parents:
4837
diff
changeset
|
1834 return true; |
a9647476d1a4
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parents:
4837
diff
changeset
|
1835 } |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
diff
changeset
|
1836 |
a9647476d1a4
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diff
changeset
|
1837 void G1CollectorPolicy::finalize_cset(double target_pause_time_ms) { |
6611 | 1838 double young_start_time_sec = os::elapsedTime(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
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|
1839 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
1840 YoungList* young_list = _g1->young_list(); |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
1841 finalize_incremental_cset_building(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
1842 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
1843 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1844 err_msg("target_pause_time_ms = %1.6lf should be positive", |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1845 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1846 guarantee(_collection_set == NULL, "Precondition"); |
342 | 1847 |
1848 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
1849 double predicted_pause_time_ms = base_time_ms; | |
1656
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6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1850 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 1851 |
6611 | 1852 ergo_verbose4(ErgoCSetConstruction | ErgoHigh, |
3914
20213c8a3c40
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3868
diff
changeset
|
1853 "start choosing CSet", |
6611 | 1854 ergo_format_size("_pending_cards") |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3868
diff
changeset
|
1855 ergo_format_ms("predicted base time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3868
diff
changeset
|
1856 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
1857 ergo_format_ms("target pause time"), |
6611 | 1858 _pending_cards, base_time_ms, time_remaining_ms, target_pause_time_ms); |
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1859 |
4710 | 1860 _last_gc_was_young = gcs_are_young() ? true : false; |
1861 | |
1862 if (_last_gc_was_young) { | |
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1863 _trace_gen0_time_data.increment_young_collection_count(); |
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1864 } else { |
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1865 _trace_gen0_time_data.increment_mixed_collection_count(); |
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1866 } |
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1867 |
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1868 // The young list is laid with the survivor regions from the previous |
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1869 // pause are appended to the RHS of the young list, i.e. |
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1870 // [Newly Young Regions ++ Survivors from last pause]. |
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1871 |
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1872 uint survivor_region_length = young_list->survivor_length(); |
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1873 uint eden_region_length = young_list->length() - survivor_region_length; |
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1874 init_cset_region_lengths(eden_region_length, survivor_region_length); |
6611 | 1875 |
1876 HeapRegion* hr = young_list->first_survivor_region(); | |
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1877 while (hr != NULL) { |
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1878 assert(hr->is_survivor(), "badly formed young list"); |
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1879 hr->set_young(); |
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1880 hr = hr->get_next_young_region(); |
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1881 } |
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1882 |
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1883 // Clear the fields that point to the survivor list - they are all young now. |
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1884 young_list->clear_survivors(); |
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1885 |
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1886 _collection_set = _inc_cset_head; |
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1887 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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1888 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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1889 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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1890 |
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1891 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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1892 "add young regions to CSet", |
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1893 ergo_format_region("eden") |
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1894 ergo_format_region("survivors") |
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1895 ergo_format_ms("predicted young region time"), |
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1896 eden_region_length, survivor_region_length, |
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1897 _inc_cset_predicted_elapsed_time_ms); |
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1898 |
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1899 // The number of recorded young regions is the incremental |
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1900 // collection set's current size |
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1901 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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1902 |
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1903 double young_end_time_sec = os::elapsedTime(); |
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1904 phase_times()->record_young_cset_choice_time_ms((young_end_time_sec - young_start_time_sec) * 1000.0); |
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1905 |
6611 | 1906 // Set the start of the non-young choice time. |
1907 double non_young_start_time_sec = young_end_time_sec; | |
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1908 |
4710 | 1909 if (!gcs_are_young()) { |
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1910 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1911 cset_chooser->verify(); |
1912 const uint min_old_cset_length = cset_chooser->calc_min_old_cset_length(); | |
1913 const uint max_old_cset_length = cset_chooser->calc_max_old_cset_length(); | |
6010
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1914 |
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1915 uint expensive_region_num = 0; |
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1916 bool check_time_remaining = adaptive_young_list_length(); |
6611 | 1917 |
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1918 HeapRegion* hr = cset_chooser->peek(); |
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1919 while (hr != NULL) { |
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1920 if (old_cset_region_length() >= max_old_cset_length) { |
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1921 // Added maximum number of old regions to the CSet. |
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1922 ergo_verbose2(ErgoCSetConstruction, |
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1923 "finish adding old regions to CSet", |
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1924 ergo_format_reason("old CSet region num reached max") |
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1925 ergo_format_region("old") |
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1926 ergo_format_region("max"), |
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1927 old_cset_region_length(), max_old_cset_length); |
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1928 break; |
342 | 1929 } |
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1930 |
6611 | 1931 double predicted_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
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1932 if (check_time_remaining) { |
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1933 if (predicted_time_ms > time_remaining_ms) { |
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1934 // Too expensive for the current CSet. |
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1935 |
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1936 if (old_cset_region_length() >= min_old_cset_length) { |
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1937 // We have added the minimum number of old regions to the CSet, |
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1938 // we are done with this CSet. |
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1939 ergo_verbose4(ErgoCSetConstruction, |
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1940 "finish adding old regions to CSet", |
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1941 ergo_format_reason("predicted time is too high") |
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1942 ergo_format_ms("predicted time") |
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1943 ergo_format_ms("remaining time") |
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1944 ergo_format_region("old") |
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1945 ergo_format_region("min"), |
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1946 predicted_time_ms, time_remaining_ms, |
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1947 old_cset_region_length(), min_old_cset_length); |
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1948 break; |
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1949 } |
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1950 |
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1951 // We'll add it anyway given that we haven't reached the |
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1952 // minimum number of old regions. |
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1953 expensive_region_num += 1; |
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1954 } |
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1955 } else { |
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1956 if (old_cset_region_length() >= min_old_cset_length) { |
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1957 // In the non-auto-tuning case, we'll finish adding regions |
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1958 // to the CSet if we reach the minimum. |
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1959 ergo_verbose2(ErgoCSetConstruction, |
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1960 "finish adding old regions to CSet", |
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1961 ergo_format_reason("old CSet region num reached min") |
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1962 ergo_format_region("old") |
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1963 ergo_format_region("min"), |
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1964 old_cset_region_length(), min_old_cset_length); |
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1965 break; |
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1966 } |
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1967 } |
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1968 |
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1969 // We will add this region to the CSet. |
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1970 time_remaining_ms -= predicted_time_ms; |
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1971 predicted_pause_time_ms += predicted_time_ms; |
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1972 cset_chooser->remove_and_move_to_next(hr); |
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1973 _g1->old_set_remove(hr); |
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1974 add_old_region_to_cset(hr); |
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1975 |
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1976 hr = cset_chooser->peek(); |
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1977 } |
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1978 if (hr == NULL) { |
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1979 ergo_verbose0(ErgoCSetConstruction, |
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1980 "finish adding old regions to CSet", |
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1981 ergo_format_reason("candidate old regions not available")); |
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1982 } |
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1983 |
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1984 if (expensive_region_num > 0) { |
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1985 // We print the information once here at the end, predicated on |
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1986 // whether we added any apparently expensive regions or not, to |
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1987 // avoid generating output per region. |
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1988 ergo_verbose4(ErgoCSetConstruction, |
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1989 "added expensive regions to CSet", |
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1990 ergo_format_reason("old CSet region num not reached min") |
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1991 ergo_format_region("old") |
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|
1992 ergo_format_region("expensive") |
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|
1993 ergo_format_region("min") |
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|
1994 ergo_format_ms("remaining time"), |
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1995 old_cset_region_length(), |
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1996 expensive_region_num, |
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1997 min_old_cset_length, |
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1998 time_remaining_ms); |
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|
1999 } |
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2000 |
6011 | 2001 cset_chooser->verify(); |
342 | 2002 } |
2003 | |
1394
1316cec51b4d
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|
2004 stop_incremental_cset_building(); |
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|
2005 |
3914
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2006 ergo_verbose5(ErgoCSetConstruction, |
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2007 "finish choosing CSet", |
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|
2008 ergo_format_region("eden") |
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|
2009 ergo_format_region("survivors") |
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|
2010 ergo_format_region("old") |
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|
2011 ergo_format_ms("predicted pause time") |
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|
2012 ergo_format_ms("target pause time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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|
2013 eden_region_length, survivor_region_length, |
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|
2014 old_cset_region_length(), |
3914
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|
2015 predicted_pause_time_ms, target_pause_time_ms); |
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|
2016 |
342 | 2017 double non_young_end_time_sec = os::elapsedTime(); |
6628
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2018 phase_times()->record_non_young_cset_choice_time_ms((non_young_end_time_sec - non_young_start_time_sec) * 1000.0); |
342 | 2019 } |
6109
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2020 |
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2021 void TraceGen0TimeData::record_start_collection(double time_to_stop_the_world_ms) { |
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2022 if(TraceGen0Time) { |
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|
2023 _all_stop_world_times_ms.add(time_to_stop_the_world_ms); |
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|
2024 } |
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|
2025 } |
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|
2026 |
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2027 void TraceGen0TimeData::record_yield_time(double yield_time_ms) { |
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|
2028 if(TraceGen0Time) { |
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|
2029 _all_yield_times_ms.add(yield_time_ms); |
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|
2030 } |
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|
2031 } |
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|
2032 |
6219
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|
2033 void TraceGen0TimeData::record_end_collection(double pause_time_ms, G1GCPhaseTimes* phase_times) { |
6109
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|
2034 if(TraceGen0Time) { |
6219
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2035 _total.add(pause_time_ms); |
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2036 _other.add(pause_time_ms - phase_times->accounted_time_ms()); |
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|
2037 _root_region_scan_wait.add(phase_times->root_region_scan_wait_time_ms()); |
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2038 _parallel.add(phase_times->cur_collection_par_time_ms()); |
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|
2039 _ext_root_scan.add(phase_times->average_last_ext_root_scan_time()); |
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|
2040 _satb_filtering.add(phase_times->average_last_satb_filtering_times_ms()); |
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|
2041 _update_rs.add(phase_times->average_last_update_rs_time()); |
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|
2042 _scan_rs.add(phase_times->average_last_scan_rs_time()); |
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|
2043 _obj_copy.add(phase_times->average_last_obj_copy_time()); |
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|
2044 _termination.add(phase_times->average_last_termination_time()); |
6219
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|
2045 |
6628
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|
2046 double parallel_known_time = phase_times->average_last_ext_root_scan_time() + |
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|
2047 phase_times->average_last_satb_filtering_times_ms() + |
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|
2048 phase_times->average_last_update_rs_time() + |
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|
2049 phase_times->average_last_scan_rs_time() + |
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|
2050 phase_times->average_last_obj_copy_time() + |
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|
2051 + phase_times->average_last_termination_time(); |
6219
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|
2052 |
6628
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|
2053 double parallel_other_time = phase_times->cur_collection_par_time_ms() - parallel_known_time; |
6219
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|
2054 _parallel_other.add(parallel_other_time); |
6628
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brutisso
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|
2055 _clear_ct.add(phase_times->cur_clear_ct_time_ms()); |
6109
bbc900c2482a
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brutisso
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diff
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|
2056 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2057 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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diff
changeset
|
2058 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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changeset
|
2059 void TraceGen0TimeData::increment_young_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2060 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2061 ++_young_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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diff
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|
2062 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2063 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2064 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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changeset
|
2065 void TraceGen0TimeData::increment_mixed_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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changeset
|
2066 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2067 ++_mixed_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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diff
changeset
|
2068 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2069 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2070 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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changeset
|
2071 void TraceGen0TimeData::print_summary(const char* str, |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2072 const NumberSeq* seq) const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2073 double sum = seq->sum(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2074 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:
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|
2075 str, sum / 1000.0, seq->avg()); |
bbc900c2482a
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brutisso
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|
2076 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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diff
changeset
|
2077 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
2078 void TraceGen0TimeData::print_summary_sd(const char* str, |
6109
bbc900c2482a
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brutisso
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|
2079 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
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|
2080 print_summary(str, seq); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2081 gclog_or_tty->print_cr("%+45s = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2082 "(num", seq->num(), seq->sd(), seq->maximum()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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changeset
|
2083 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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diff
changeset
|
2084 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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changeset
|
2085 void TraceGen0TimeData::print() const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2086 if (!TraceGen0Time) { |
bbc900c2482a
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brutisso
parents:
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changeset
|
2087 return; |
bbc900c2482a
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brutisso
parents:
6064
diff
changeset
|
2088 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2089 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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changeset
|
2090 gclog_or_tty->print_cr("ALL PAUSES"); |
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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|
2091 print_summary_sd(" Total", &_total); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2092 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2093 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2094 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
bbc900c2482a
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|
2095 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); |
bbc900c2482a
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brutisso
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|
2096 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2097 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2098 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
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changeset
|
2099 |
bbc900c2482a
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|
2100 if (_young_pause_num == 0 && _mixed_pause_num == 0) { |
bbc900c2482a
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|
2101 gclog_or_tty->print_cr("none"); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2102 } else { |
6219
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7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
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|
2103 print_summary_sd(" Evacuation Pauses", &_total); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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|
2104 print_summary(" Root Region Scan Wait", &_root_region_scan_wait); |
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2105 print_summary(" Parallel Time", &_parallel); |
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2106 print_summary(" Ext Root Scanning", &_ext_root_scan); |
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2107 print_summary(" SATB Filtering", &_satb_filtering); |
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2108 print_summary(" Update RS", &_update_rs); |
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2109 print_summary(" Scan RS", &_scan_rs); |
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2110 print_summary(" Object Copy", &_obj_copy); |
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2111 print_summary(" Termination", &_termination); |
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2112 print_summary(" Parallel Other", &_parallel_other); |
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2113 print_summary(" Clear CT", &_clear_ct); |
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2114 print_summary(" Other", &_other); |
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2115 } |
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2116 gclog_or_tty->print_cr(""); |
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2117 |
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2118 gclog_or_tty->print_cr("MISC"); |
6219
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2119 print_summary_sd(" Stop World", &_all_stop_world_times_ms); |
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2120 print_summary_sd(" Yields", &_all_yield_times_ms); |
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2121 } |
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2122 |
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2123 void TraceGen1TimeData::record_full_collection(double full_gc_time_ms) { |
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2124 if (TraceGen1Time) { |
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2125 _all_full_gc_times.add(full_gc_time_ms); |
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2126 } |
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2127 } |
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2128 |
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2129 void TraceGen1TimeData::print() const { |
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2130 if (!TraceGen1Time) { |
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2131 return; |
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2132 } |
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2133 |
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2134 if (_all_full_gc_times.num() > 0) { |
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2135 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
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2136 _all_full_gc_times.num(), |
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2137 _all_full_gc_times.sum() / 1000.0); |
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2138 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times.avg()); |
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2139 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", |
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2140 _all_full_gc_times.sd(), |
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2141 _all_full_gc_times.maximum()); |
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2142 } |
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2143 } |