Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 13037:c8fc12209830
8027616: Off by one error in putback for compressed oops nashorn performance improvement
Summary: Should compare bounds greater than or equal 4G when deciding if shift is needed or CDS area + compressed class space are within 4G of each other.
Reviewed-by: stefank, hseigel, zgu
author | coleenp |
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date | Thu, 31 Oct 2013 14:11:02 -0400 |
parents | 24f32d09a0d7 |
children | 4288e54fd145 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
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32 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
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33 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 34 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
35 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
36 #include "runtime/arguments.hpp" | |
37 #include "runtime/java.hpp" | |
38 #include "runtime/mutexLocker.hpp" | |
39 #include "utilities/debug.hpp" | |
342 | 40 |
41 // Different defaults for different number of GC threads | |
42 // They were chosen by running GCOld and SPECjbb on debris with different | |
43 // numbers of GC threads and choosing them based on the results | |
44 | |
45 // all the same | |
46 static double rs_length_diff_defaults[] = { | |
47 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
48 }; | |
49 | |
50 static double cost_per_card_ms_defaults[] = { | |
51 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
52 }; | |
53 | |
54 // all the same | |
4710 | 55 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 56 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
57 }; | |
58 | |
59 static double cost_per_entry_ms_defaults[] = { | |
60 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
61 }; | |
62 | |
63 static double cost_per_byte_ms_defaults[] = { | |
64 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
65 }; | |
66 | |
67 // these should be pretty consistent | |
68 static double constant_other_time_ms_defaults[] = { | |
69 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
70 }; | |
71 | |
72 | |
73 static double young_other_cost_per_region_ms_defaults[] = { | |
74 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
75 }; | |
76 | |
77 static double non_young_other_cost_per_region_ms_defaults[] = { | |
78 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
79 }; | |
80 | |
81 G1CollectorPolicy::G1CollectorPolicy() : | |
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82 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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83 ? ParallelGCThreads : 1), |
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84 |
342 | 85 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
86 _stop_world_start(0.0), | |
87 | |
88 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
89 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
90 | |
91 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
92 _prev_collection_pause_end_ms(0.0), | |
93 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
94 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 95 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
96 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 97 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 98 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 99 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
100 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
101 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
102 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
103 _non_young_other_cost_per_region_ms_seq( | |
104 new TruncatedSeq(TruncatedSeqLength)), | |
105 | |
106 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
107 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
108 | |
751 | 109 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 110 |
4710 | 111 _gcs_are_young(true), |
342 | 112 |
113 _during_marking(false), | |
114 _in_marking_window(false), | |
115 _in_marking_window_im(false), | |
116 | |
4710 | 117 _recent_prev_end_times_for_all_gcs_sec( |
118 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 119 |
120 _recent_avg_pause_time_ratio(0.0), | |
121 | |
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122 _initiate_conc_mark_if_possible(false), |
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123 _during_initial_mark_pause(false), |
4710 | 124 _last_young_gc(false), |
125 _last_gc_was_young(false), | |
342 | 126 |
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127 _eden_used_bytes_before_gc(0), |
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128 _survivor_used_bytes_before_gc(0), |
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129 _heap_used_bytes_before_gc(0), |
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130 _metaspace_used_bytes_before_gc(0), |
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131 _eden_capacity_bytes_before_gc(0), |
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132 _heap_capacity_bytes_before_gc(0), |
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133 |
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134 _eden_cset_region_length(0), |
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135 _survivor_cset_region_length(0), |
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136 _old_cset_region_length(0), |
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137 |
342 | 138 _collection_set(NULL), |
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139 _collection_set_bytes_used_before(0), |
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140 |
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141 // Incremental CSet attributes |
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142 _inc_cset_build_state(Inactive), |
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143 _inc_cset_head(NULL), |
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144 _inc_cset_tail(NULL), |
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145 _inc_cset_bytes_used_before(0), |
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146 _inc_cset_max_finger(NULL), |
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147 _inc_cset_recorded_rs_lengths(0), |
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148 _inc_cset_recorded_rs_lengths_diffs(0), |
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149 _inc_cset_predicted_elapsed_time_ms(0.0), |
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150 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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151 |
342 | 152 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
153 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
154 #endif // _MSC_VER | |
155 | |
156 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
157 G1YoungSurvRateNumRegionsSummary)), | |
158 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 159 G1YoungSurvRateNumRegionsSummary)), |
342 | 160 // add here any more surv rate groups |
545 | 161 _recorded_survivor_regions(0), |
162 _recorded_survivor_head(NULL), | |
163 _recorded_survivor_tail(NULL), | |
1356 | 164 _survivors_age_table(true), |
165 | |
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166 _gc_overhead_perc(0.0) { |
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167 |
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168 // Set up the region size and associated fields. Given that the |
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169 // policy is created before the heap, we have to set this up here, |
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170 // so it's done as soon as possible. |
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171 |
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172 // It would have been natural to pass initial_heap_byte_size() and |
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173 // max_heap_byte_size() to setup_heap_region_size() but those have |
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174 // not been set up at this point since they should be aligned with |
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175 // the region size. So, there is a circular dependency here. We base |
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176 // the region size on the heap size, but the heap size should be |
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177 // aligned with the region size. To get around this we use the |
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178 // unaligned values for the heap. |
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179 HeapRegion::setup_heap_region_size(InitialHeapSize, MaxHeapSize); |
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180 HeapRegionRemSet::setup_remset_size(); |
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181 |
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182 G1ErgoVerbose::initialize(); |
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183 if (PrintAdaptiveSizePolicy) { |
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184 // Currently, we only use a single switch for all the heuristics. |
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185 G1ErgoVerbose::set_enabled(true); |
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186 // Given that we don't currently have a verboseness level |
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187 // parameter, we'll hardcode this to high. This can be easily |
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188 // changed in the future. |
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189 G1ErgoVerbose::set_level(ErgoHigh); |
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190 } else { |
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191 G1ErgoVerbose::set_enabled(false); |
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192 } |
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193 |
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194 // Verify PLAB sizes |
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195 const size_t region_size = HeapRegion::GrainWords; |
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196 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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197 char buffer[128]; |
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198 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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199 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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200 vm_exit_during_initialization(buffer); |
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201 } |
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202 |
342 | 203 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
204 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
205 | |
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206 _phase_times = new G1GCPhaseTimes(_parallel_gc_threads); |
342 | 207 |
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208 int index = MIN2(_parallel_gc_threads - 1, 7); |
342 | 209 |
210 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
211 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 212 _young_cards_per_entry_ratio_seq->add( |
213 young_cards_per_entry_ratio_defaults[index]); | |
342 | 214 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
215 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
216 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
217 _young_other_cost_per_region_ms_seq->add( | |
218 young_other_cost_per_region_ms_defaults[index]); | |
219 _non_young_other_cost_per_region_ms_seq->add( | |
220 non_young_other_cost_per_region_ms_defaults[index]); | |
221 | |
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222 // Below, we might need to calculate the pause time target based on |
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223 // the pause interval. When we do so we are going to give G1 maximum |
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224 // flexibility and allow it to do pauses when it needs to. So, we'll |
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225 // arrange that the pause interval to be pause time target + 1 to |
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226 // ensure that a) the pause time target is maximized with respect to |
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227 // the pause interval and b) we maintain the invariant that pause |
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228 // time target < pause interval. If the user does not want this |
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229 // maximum flexibility, they will have to set the pause interval |
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230 // explicitly. |
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231 |
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232 // First make sure that, if either parameter is set, its value is |
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233 // reasonable. |
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234 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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235 if (MaxGCPauseMillis < 1) { |
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236 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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237 "greater than 0"); |
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238 } |
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239 } |
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240 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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241 if (GCPauseIntervalMillis < 1) { |
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242 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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243 "greater than 0"); |
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244 } |
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245 } |
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246 |
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247 // Then, if the pause time target parameter was not set, set it to |
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248 // the default value. |
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249 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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250 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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251 // The default pause time target in G1 is 200ms |
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252 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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253 } else { |
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254 // We do not allow the pause interval to be set without the |
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255 // pause time target |
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256 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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257 "without setting MaxGCPauseMillis"); |
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258 } |
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259 } |
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260 |
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261 // Then, if the interval parameter was not set, set it according to |
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262 // the pause time target (this will also deal with the case when the |
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263 // pause time target is the default value). |
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264 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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265 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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266 } |
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267 |
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268 // Finally, make sure that the two parameters are consistent. |
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269 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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270 char buffer[256]; |
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271 jio_snprintf(buffer, 256, |
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272 "MaxGCPauseMillis (%u) should be less than " |
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273 "GCPauseIntervalMillis (%u)", |
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274 MaxGCPauseMillis, GCPauseIntervalMillis); |
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275 vm_exit_during_initialization(buffer); |
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276 } |
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277 |
751 | 278 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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279 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 280 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
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281 |
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282 uintx confidence_perc = G1ConfidencePercent; |
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283 // Put an artificial ceiling on this so that it's not set to a silly value. |
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284 if (confidence_perc > 100) { |
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285 confidence_perc = 100; |
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286 warning("G1ConfidencePercent is set to a value that is too large, " |
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287 "it's been updated to %u", confidence_perc); |
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288 } |
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289 _sigma = (double) confidence_perc / 100.0; |
342 | 290 |
291 // start conservatively (around 50ms is about right) | |
292 _concurrent_mark_remark_times_ms->add(0.05); | |
293 _concurrent_mark_cleanup_times_ms->add(0.20); | |
294 _tenuring_threshold = MaxTenuringThreshold; | |
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295 // _max_survivor_regions will be calculated by |
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296 // update_young_list_target_length() during initialization. |
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297 _max_survivor_regions = 0; |
545 | 298 |
1356 | 299 assert(GCTimeRatio > 0, |
300 "we should have set it to a default value set_g1_gc_flags() " | |
301 "if a user set it to 0"); | |
302 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
303 | |
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304 uintx reserve_perc = G1ReservePercent; |
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305 // Put an artificial ceiling on this so that it's not set to a silly value. |
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306 if (reserve_perc > 50) { |
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307 reserve_perc = 50; |
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308 warning("G1ReservePercent is set to a value that is too large, " |
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309 "it's been updated to %u", reserve_perc); |
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310 } |
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311 _reserve_factor = (double) reserve_perc / 100.0; |
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312 // This will be set when the heap is expanded |
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313 // for the first time during initialization. |
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314 _reserve_regions = 0; |
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315 |
342 | 316 initialize_all(); |
4013 | 317 _collectionSetChooser = new CollectionSetChooser(); |
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318 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 319 } |
320 | |
321 void G1CollectorPolicy::initialize_flags() { | |
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322 _min_alignment = HeapRegion::GrainBytes; |
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323 size_t card_table_alignment = GenRemSet::max_alignment_constraint(rem_set_name()); |
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324 size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size(); |
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325 _max_alignment = MAX3(card_table_alignment, _min_alignment, page_size); |
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326 if (SurvivorRatio < 1) { |
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327 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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328 } |
342 | 329 CollectorPolicy::initialize_flags(); |
330 } | |
331 | |
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332 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
7449 | 333 assert(G1NewSizePercent <= G1MaxNewSizePercent, "Min larger than max"); |
334 assert(G1NewSizePercent > 0 && G1NewSizePercent < 100, "Min out of bounds"); | |
335 assert(G1MaxNewSizePercent > 0 && G1MaxNewSizePercent < 100, "Max out of bounds"); | |
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336 |
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337 if (FLAG_IS_CMDLINE(NewRatio)) { |
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338 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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339 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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340 } else { |
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341 _sizer_kind = SizerNewRatio; |
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342 _adaptive_size = false; |
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343 return; |
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344 } |
3976 | 345 } |
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346 |
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347 if (FLAG_IS_CMDLINE(NewSize) && FLAG_IS_CMDLINE(MaxNewSize) && NewSize > MaxNewSize) { |
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348 vm_exit_during_initialization("Initial young gen size set larger than the maximum young gen size"); |
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349 } |
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350 |
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351 if (FLAG_IS_CMDLINE(NewSize)) { |
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352 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), |
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353 1U); |
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354 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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355 _max_desired_young_length = |
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356 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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357 1U); |
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358 _sizer_kind = SizerMaxAndNewSize; |
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359 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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360 } else { |
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361 _sizer_kind = SizerNewSizeOnly; |
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362 } |
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363 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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364 _max_desired_young_length = |
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365 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), |
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366 1U); |
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367 _sizer_kind = SizerMaxNewSizeOnly; |
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368 } |
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369 } |
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370 |
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371 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { |
7449 | 372 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100; |
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373 return MAX2(1U, default_value); |
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374 } |
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375 |
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376 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { |
7449 | 377 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100; |
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378 return MAX2(1U, default_value); |
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379 } |
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380 |
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381 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { |
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382 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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383 |
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384 switch (_sizer_kind) { |
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385 case SizerDefaults: |
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386 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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387 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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388 break; |
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389 case SizerNewSizeOnly: |
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390 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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391 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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392 break; |
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393 case SizerMaxNewSizeOnly: |
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394 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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395 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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396 break; |
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397 case SizerMaxAndNewSize: |
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398 // Do nothing. Values set on the command line, don't update them at runtime. |
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399 break; |
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400 case SizerNewRatio: |
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401 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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402 _max_desired_young_length = _min_desired_young_length; |
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403 break; |
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404 default: |
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405 ShouldNotReachHere(); |
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406 } |
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407 |
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408 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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409 } |
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410 |
342 | 411 void G1CollectorPolicy::init() { |
412 // Set aside an initial future to_space. | |
413 _g1 = G1CollectedHeap::heap(); | |
414 | |
415 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
416 | |
545 | 417 initialize_gc_policy_counters(); |
418 | |
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419 if (adaptive_young_list_length()) { |
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420 _young_list_fixed_length = 0; |
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421 } else { |
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422 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 423 } |
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424 _free_regions_at_end_of_collection = _g1->free_regions(); |
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425 update_young_list_target_length(); |
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426 |
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427 // We may immediately start allocating regions and placing them on the |
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428 // collection set list. Initialize the per-collection set info |
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429 start_incremental_cset_building(); |
342 | 430 } |
431 | |
545 | 432 // Create the jstat counters for the policy. |
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433 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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434 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 435 } |
436 | |
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437 bool G1CollectorPolicy::predict_will_fit(uint young_length, |
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438 double base_time_ms, |
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439 uint base_free_regions, |
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440 double target_pause_time_ms) { |
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441 if (young_length >= base_free_regions) { |
342 | 442 // end condition 1: not enough space for the young regions |
443 return false; | |
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444 } |
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445 |
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446 double accum_surv_rate = accum_yg_surv_rate_pred((int) young_length - 1); |
342 | 447 size_t bytes_to_copy = |
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448 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 449 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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450 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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451 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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452 if (pause_time_ms > target_pause_time_ms) { |
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453 // end condition 2: prediction is over the target pause time |
342 | 454 return false; |
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455 } |
342 | 456 |
457 size_t free_bytes = | |
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458 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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459 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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460 // end condition 3: out-of-space (conservatively!) |
342 | 461 return false; |
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462 } |
342 | 463 |
464 // success! | |
465 return true; | |
466 } | |
467 | |
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468 void G1CollectorPolicy::record_new_heap_size(uint new_number_of_regions) { |
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469 // re-calculate the necessary reserve |
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470 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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471 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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472 // smaller than 1.0) we'll get 1. |
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473 _reserve_regions = (uint) ceil(reserve_regions_d); |
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474 |
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475 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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476 } |
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477 |
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478 uint G1CollectorPolicy::calculate_young_list_desired_min_length( |
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479 uint base_min_length) { |
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480 uint desired_min_length = 0; |
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481 if (adaptive_young_list_length()) { |
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482 if (_alloc_rate_ms_seq->num() > 3) { |
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483 double now_sec = os::elapsedTime(); |
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484 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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485 double alloc_rate_ms = predict_alloc_rate_ms(); |
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486 desired_min_length = (uint) ceil(alloc_rate_ms * when_ms); |
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487 } else { |
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488 // otherwise we don't have enough info to make the prediction |
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489 } |
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490 } |
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491 desired_min_length += base_min_length; |
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492 // make sure we don't go below any user-defined minimum bound |
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493 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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494 } |
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495 |
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496 uint G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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497 // Here, we might want to also take into account any additional |
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498 // constraints (i.e., user-defined minimum bound). Currently, we |
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499 // effectively don't set this bound. |
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500 return _young_gen_sizer->max_desired_young_length(); |
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501 } |
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502 |
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503 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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504 if (rs_lengths == (size_t) -1) { |
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505 // if it's set to the default value (-1), we should predict it; |
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506 // otherwise, use the given value. |
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507 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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508 } |
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509 |
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510 // Calculate the absolute and desired min bounds. |
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511 |
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512 // This is how many young regions we already have (currently: the survivors). |
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513 uint base_min_length = recorded_survivor_regions(); |
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514 // This is the absolute minimum young length, which ensures that we |
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515 // can allocate one eden region in the worst-case. |
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516 uint absolute_min_length = base_min_length + 1; |
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517 uint desired_min_length = |
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518 calculate_young_list_desired_min_length(base_min_length); |
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519 if (desired_min_length < absolute_min_length) { |
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520 desired_min_length = absolute_min_length; |
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521 } |
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522 |
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523 // Calculate the absolute and desired max bounds. |
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524 |
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525 // We will try our best not to "eat" into the reserve. |
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526 uint absolute_max_length = 0; |
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527 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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528 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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529 } |
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530 uint desired_max_length = calculate_young_list_desired_max_length(); |
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531 if (desired_max_length > absolute_max_length) { |
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532 desired_max_length = absolute_max_length; |
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533 } |
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534 |
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535 uint young_list_target_length = 0; |
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536 if (adaptive_young_list_length()) { |
4710 | 537 if (gcs_are_young()) { |
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538 young_list_target_length = |
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539 calculate_young_list_target_length(rs_lengths, |
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540 base_min_length, |
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541 desired_min_length, |
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542 desired_max_length); |
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543 _rs_lengths_prediction = rs_lengths; |
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544 } else { |
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545 // Don't calculate anything and let the code below bound it to |
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546 // the desired_min_length, i.e., do the next GC as soon as |
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547 // possible to maximize how many old regions we can add to it. |
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548 } |
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549 } else { |
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550 // The user asked for a fixed young gen so we'll fix the young gen |
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551 // whether the next GC is young or mixed. |
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552 young_list_target_length = _young_list_fixed_length; |
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553 } |
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554 |
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555 // Make sure we don't go over the desired max length, nor under the |
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556 // desired min length. In case they clash, desired_min_length wins |
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557 // which is why that test is second. |
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558 if (young_list_target_length > desired_max_length) { |
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559 young_list_target_length = desired_max_length; |
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560 } |
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561 if (young_list_target_length < desired_min_length) { |
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562 young_list_target_length = desired_min_length; |
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563 } |
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564 |
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565 assert(young_list_target_length > recorded_survivor_regions(), |
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566 "we should be able to allocate at least one eden region"); |
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567 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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568 _young_list_target_length = young_list_target_length; |
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569 |
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570 update_max_gc_locker_expansion(); |
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571 } |
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572 |
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573 uint |
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574 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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575 uint base_min_length, |
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576 uint desired_min_length, |
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577 uint desired_max_length) { |
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578 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 579 assert(gcs_are_young(), "only call this for young GCs"); |
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580 |
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581 // In case some edge-condition makes the desired max length too small... |
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582 if (desired_max_length <= desired_min_length) { |
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583 return desired_min_length; |
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584 } |
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585 |
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586 // We'll adjust min_young_length and max_young_length not to include |
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587 // the already allocated young regions (i.e., so they reflect the |
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588 // min and max eden regions we'll allocate). The base_min_length |
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589 // will be reflected in the predictions by the |
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590 // survivor_regions_evac_time prediction. |
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591 assert(desired_min_length > base_min_length, "invariant"); |
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592 uint min_young_length = desired_min_length - base_min_length; |
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593 assert(desired_max_length > base_min_length, "invariant"); |
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594 uint max_young_length = desired_max_length - base_min_length; |
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595 |
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596 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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597 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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598 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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599 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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600 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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601 double base_time_ms = |
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602 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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603 survivor_regions_evac_time; |
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604 uint available_free_regions = _free_regions_at_end_of_collection; |
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605 uint base_free_regions = 0; |
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606 if (available_free_regions > _reserve_regions) { |
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607 base_free_regions = available_free_regions - _reserve_regions; |
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608 } |
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609 |
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610 // Here, we will make sure that the shortest young length that |
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611 // makes sense fits within the target pause time. |
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612 |
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613 if (predict_will_fit(min_young_length, base_time_ms, |
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614 base_free_regions, target_pause_time_ms)) { |
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615 // The shortest young length will fit into the target pause time; |
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616 // we'll now check whether the absolute maximum number of young |
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617 // regions will fit in the target pause time. If not, we'll do |
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618 // a binary search between min_young_length and max_young_length. |
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619 if (predict_will_fit(max_young_length, base_time_ms, |
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620 base_free_regions, target_pause_time_ms)) { |
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621 // The maximum young length will fit into the target pause time. |
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622 // We are done so set min young length to the maximum length (as |
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623 // the result is assumed to be returned in min_young_length). |
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624 min_young_length = max_young_length; |
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625 } else { |
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626 // The maximum possible number of young regions will not fit within |
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627 // the target pause time so we'll search for the optimal |
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628 // length. The loop invariants are: |
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629 // |
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630 // min_young_length < max_young_length |
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631 // min_young_length is known to fit into the target pause time |
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632 // max_young_length is known not to fit into the target pause time |
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633 // |
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634 // Going into the loop we know the above hold as we've just |
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635 // checked them. Every time around the loop we check whether |
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636 // the middle value between min_young_length and |
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637 // max_young_length fits into the target pause time. If it |
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638 // does, it becomes the new min. If it doesn't, it becomes |
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639 // the new max. This way we maintain the loop invariants. |
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640 |
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641 assert(min_young_length < max_young_length, "invariant"); |
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642 uint diff = (max_young_length - min_young_length) / 2; |
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643 while (diff > 0) { |
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644 uint young_length = min_young_length + diff; |
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645 if (predict_will_fit(young_length, base_time_ms, |
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646 base_free_regions, target_pause_time_ms)) { |
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647 min_young_length = young_length; |
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648 } else { |
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649 max_young_length = young_length; |
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650 } |
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651 assert(min_young_length < max_young_length, "invariant"); |
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652 diff = (max_young_length - min_young_length) / 2; |
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653 } |
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654 // The results is min_young_length which, according to the |
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655 // loop invariants, should fit within the target pause time. |
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656 |
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657 // These are the post-conditions of the binary search above: |
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658 assert(min_young_length < max_young_length, |
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659 "otherwise we should have discovered that max_young_length " |
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660 "fits into the pause target and not done the binary search"); |
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661 assert(predict_will_fit(min_young_length, base_time_ms, |
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662 base_free_regions, target_pause_time_ms), |
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663 "min_young_length, the result of the binary search, should " |
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664 "fit into the pause target"); |
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665 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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666 base_free_regions, target_pause_time_ms), |
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667 "min_young_length, the result of the binary search, should be " |
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668 "optimal, so no larger length should fit into the pause target"); |
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669 } |
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670 } else { |
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671 // Even the minimum length doesn't fit into the pause time |
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672 // target, return it as the result nevertheless. |
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673 } |
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674 return base_min_length + min_young_length; |
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675 } |
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676 |
545 | 677 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
678 double survivor_regions_evac_time = 0.0; | |
679 for (HeapRegion * r = _recorded_survivor_head; | |
680 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
681 r = r->get_next_young_region()) { | |
6611 | 682 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, gcs_are_young()); |
545 | 683 } |
684 return survivor_regions_evac_time; | |
685 } | |
686 | |
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687 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 688 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
689 | |
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690 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 691 if (rs_lengths > _rs_lengths_prediction) { |
692 // add 10% to avoid having to recalculate often | |
693 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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694 update_young_list_target_length(rs_lengths_prediction); |
342 | 695 } |
696 } | |
697 | |
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698 |
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699 |
342 | 700 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
701 bool is_tlab, | |
702 bool* gc_overhead_limit_was_exceeded) { | |
703 guarantee(false, "Not using this policy feature yet."); | |
704 return NULL; | |
705 } | |
706 | |
707 // This method controls how a collector handles one or more | |
708 // of its generations being fully allocated. | |
709 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
710 bool is_tlab) { | |
711 guarantee(false, "Not using this policy feature yet."); | |
712 return NULL; | |
713 } | |
714 | |
715 | |
716 #ifndef PRODUCT | |
717 bool G1CollectorPolicy::verify_young_ages() { | |
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718 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 719 return |
720 verify_young_ages(head, _short_lived_surv_rate_group); | |
721 // also call verify_young_ages on any additional surv rate groups | |
722 } | |
723 | |
724 bool | |
725 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
726 SurvRateGroup *surv_rate_group) { | |
727 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
728 | |
729 const char* name = surv_rate_group->name(); | |
730 bool ret = true; | |
731 int prev_age = -1; | |
732 | |
733 for (HeapRegion* curr = head; | |
734 curr != NULL; | |
735 curr = curr->get_next_young_region()) { | |
736 SurvRateGroup* group = curr->surv_rate_group(); | |
737 if (group == NULL && !curr->is_survivor()) { | |
738 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
739 ret = false; | |
740 } | |
741 | |
742 if (surv_rate_group == group) { | |
743 int age = curr->age_in_surv_rate_group(); | |
744 | |
745 if (age < 0) { | |
746 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
747 ret = false; | |
748 } | |
749 | |
750 if (age <= prev_age) { | |
751 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
752 "(%d, %d)", name, age, prev_age); | |
753 ret = false; | |
754 } | |
755 prev_age = age; | |
756 } | |
757 } | |
758 | |
759 return ret; | |
760 } | |
761 #endif // PRODUCT | |
762 | |
763 void G1CollectorPolicy::record_full_collection_start() { | |
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764 _full_collection_start_sec = os::elapsedTime(); |
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765 record_heap_size_info_at_start(true /* full */); |
342 | 766 // Release the future to-space so that it is available for compaction into. |
767 _g1->set_full_collection(); | |
768 } | |
769 | |
770 void G1CollectorPolicy::record_full_collection_end() { | |
771 // Consider this like a collection pause for the purposes of allocation | |
772 // since last pause. | |
773 double end_sec = os::elapsedTime(); | |
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774 double full_gc_time_sec = end_sec - _full_collection_start_sec; |
342 | 775 double full_gc_time_ms = full_gc_time_sec * 1000.0; |
776 | |
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777 _trace_gen1_time_data.record_full_collection(full_gc_time_ms); |
342 | 778 |
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779 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 780 |
781 _g1->clear_full_collection(); | |
782 | |
4710 | 783 // "Nuke" the heuristics that control the young/mixed GC |
784 // transitions and make sure we start with young GCs after the Full GC. | |
785 set_gcs_are_young(true); | |
786 _last_young_gc = false; | |
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787 clear_initiate_conc_mark_if_possible(); |
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788 clear_during_initial_mark_pause(); |
342 | 789 _in_marking_window = false; |
790 _in_marking_window_im = false; | |
791 | |
792 _short_lived_surv_rate_group->start_adding_regions(); | |
793 // also call this on any additional surv rate groups | |
794 | |
545 | 795 record_survivor_regions(0, NULL, NULL); |
796 | |
342 | 797 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 798 // Reset survivors SurvRateGroup. |
799 _survivor_surv_rate_group->reset(); | |
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800 update_young_list_target_length(); |
6011 | 801 _collectionSetChooser->clear(); |
1973 | 802 } |
342 | 803 |
804 void G1CollectorPolicy::record_stop_world_start() { | |
805 _stop_world_start = os::elapsedTime(); | |
806 } | |
807 | |
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808 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec) { |
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809 // We only need to do this here as the policy will only be applied |
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810 // to the GC we're about to start. so, no point is calculating this |
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811 // every time we calculate / recalculate the target young length. |
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812 update_survivors_policy(); |
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813 |
1973 | 814 assert(_g1->used() == _g1->recalculate_used(), |
815 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
816 _g1->used(), _g1->recalculate_used())); | |
342 | 817 |
818 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
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819 _trace_gen0_time_data.record_start_collection(s_w_t_ms); |
342 | 820 _stop_world_start = 0.0; |
821 | |
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822 record_heap_size_info_at_start(false /* full */); |
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823 |
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824 phase_times()->record_cur_collection_start_sec(start_time_sec); |
342 | 825 _pending_cards = _g1->pending_card_num(); |
826 | |
6611 | 827 _collection_set_bytes_used_before = 0; |
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828 _bytes_copied_during_gc = 0; |
342 | 829 |
4710 | 830 _last_gc_was_young = false; |
342 | 831 |
832 // do that for any other surv rate groups | |
833 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 834 _survivors_age_table.clear(); |
545 | 835 |
342 | 836 assert( verify_young_ages(), "region age verification" ); |
837 } | |
838 | |
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839 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 840 mark_init_elapsed_time_ms) { |
841 _during_marking = true; | |
1359
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842 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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843 clear_during_initial_mark_pause(); |
342 | 844 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
845 } | |
846 | |
847 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
848 _mark_remark_start_sec = os::elapsedTime(); | |
849 _during_marking = false; | |
850 } | |
851 | |
852 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
853 double end_time_sec = os::elapsedTime(); | |
854 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
855 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
856 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
857 _prev_collection_pause_end_ms += elapsed_time_ms; | |
858 | |
859 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
860 } | |
861 | |
862 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
863 _mark_cleanup_start_sec = os::elapsedTime(); | |
864 } | |
865 | |
4013 | 866 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 867 _last_young_gc = true; |
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868 _in_marking_window = false; |
342 | 869 } |
870 | |
871 void G1CollectorPolicy::record_concurrent_pause() { | |
872 if (_stop_world_start > 0.0) { | |
873 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
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874 _trace_gen0_time_data.record_yield_time(yield_ms); |
342 | 875 } |
876 } | |
877 | |
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878 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source, size_t alloc_word_size) { |
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879 if (_g1->concurrent_mark()->cmThread()->during_cycle()) { |
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880 return false; |
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881 } |
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882 |
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883 size_t marking_initiating_used_threshold = |
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884 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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885 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
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886 size_t alloc_byte_size = alloc_word_size * HeapWordSize; |
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887 |
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888 if ((cur_used_bytes + alloc_byte_size) > marking_initiating_used_threshold) { |
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889 if (gcs_are_young() && !_last_young_gc) { |
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890 ergo_verbose5(ErgoConcCycles, |
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891 "request concurrent cycle initiation", |
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892 ergo_format_reason("occupancy higher than threshold") |
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893 ergo_format_byte("occupancy") |
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894 ergo_format_byte("allocation request") |
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895 ergo_format_byte_perc("threshold") |
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896 ergo_format_str("source"), |
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897 cur_used_bytes, |
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898 alloc_byte_size, |
4829
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899 marking_initiating_used_threshold, |
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900 (double) InitiatingHeapOccupancyPercent, |
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901 source); |
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902 return true; |
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903 } else { |
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|
904 ergo_verbose5(ErgoConcCycles, |
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905 "do not request concurrent cycle initiation", |
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906 ergo_format_reason("still doing mixed collections") |
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907 ergo_format_byte("occupancy") |
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908 ergo_format_byte("allocation request") |
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909 ergo_format_byte_perc("threshold") |
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910 ergo_format_str("source"), |
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|
911 cur_used_bytes, |
4834
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912 alloc_byte_size, |
4829
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913 marking_initiating_used_threshold, |
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914 (double) InitiatingHeapOccupancyPercent, |
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|
915 source); |
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|
916 } |
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|
917 } |
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|
918 |
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|
919 return false; |
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|
920 } |
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|
921 |
342 | 922 // Anything below that is considered to be zero |
923 #define MIN_TIMER_GRANULARITY 0.0000001 | |
924 | |
10405 | 925 void G1CollectorPolicy::record_collection_pause_end(double pause_time_ms, EvacuationInfo& evacuation_info) { |
342 | 926 double end_time_sec = os::elapsedTime(); |
4090
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927 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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928 "otherwise, the subtraction below does not make sense"); |
342 | 929 size_t rs_size = |
4090
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|
930 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 931 size_t cur_used_bytes = _g1->used(); |
932 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
933 bool last_pause_included_initial_mark = false; | |
1707 | 934 bool update_stats = !_g1->evacuation_failed(); |
342 | 935 |
936 #ifndef PRODUCT | |
937 if (G1YoungSurvRateVerbose) { | |
938 gclog_or_tty->print_cr(""); | |
939 _short_lived_surv_rate_group->print(); | |
940 // do that for any other surv rate groups too | |
941 } | |
942 #endif // PRODUCT | |
943 | |
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944 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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945 if (last_pause_included_initial_mark) { |
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946 record_concurrent_mark_init_end(0.0); |
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947 } else if (need_to_start_conc_mark("end of GC")) { |
4829
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948 // Note: this might have already been set, if during the last |
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949 // pause we decided to start a cycle but at the beginning of |
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950 // this pause we decided to postpone it. That's OK. |
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951 set_initiate_conc_mark_if_possible(); |
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952 } |
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953 |
6219
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954 _mmu_tracker->add_pause(end_time_sec - pause_time_ms/1000.0, |
342 | 955 end_time_sec, false); |
956 | |
10405 | 957 evacuation_info.set_collectionset_used_before(_collection_set_bytes_used_before); |
958 evacuation_info.set_bytes_copied(_bytes_copied_during_gc); | |
959 | |
595
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6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
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960 if (update_stats) { |
6219
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961 _trace_gen0_time_data.record_end_collection(pause_time_ms, phase_times()); |
342 | 962 // this is where we update the allocation rate of the application |
963 double app_time_ms = | |
6628
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7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
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964 (phase_times()->cur_collection_start_sec() * 1000.0 - _prev_collection_pause_end_ms); |
342 | 965 if (app_time_ms < MIN_TIMER_GRANULARITY) { |
966 // This usually happens due to the timer not having the required | |
967 // granularity. Some Linuxes are the usual culprits. | |
968 // We'll just set it to something (arbitrarily) small. | |
969 app_time_ms = 1.0; | |
970 } | |
4090
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971 // We maintain the invariant that all objects allocated by mutator |
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972 // threads will be allocated out of eden regions. So, we can use |
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973 // the eden region number allocated since the previous GC to |
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974 // calculate the application's allocate rate. The only exception |
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975 // to that is humongous objects that are allocated separately. But |
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976 // given that humongous object allocations do not really affect |
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977 // either the pause's duration nor when the next pause will take |
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978 // place we can safely ignore them here. |
6010
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979 uint regions_allocated = eden_cset_region_length(); |
342 | 980 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
981 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
982 | |
983 double interval_ms = | |
984 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
6219
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985 update_recent_gc_times(end_time_sec, pause_time_ms); |
342 | 986 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
1086
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987 if (recent_avg_pause_time_ratio() < 0.0 || |
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988 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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989 #ifndef PRODUCT |
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990 // Dump info to allow post-facto debugging |
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|
991 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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992 gclog_or_tty->print_cr("-------------------------------------------"); |
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993 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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994 _recent_gc_times_ms->dump(); |
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995 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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996 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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997 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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|
998 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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999 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1000 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1001 #endif // !PRODUCT |
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1002 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1003 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1004 if (_recent_avg_pause_time_ratio < 0.0) { |
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1005 _recent_avg_pause_time_ratio = 0.0; |
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1006 } else { |
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1007 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1008 _recent_avg_pause_time_ratio = 1.0; |
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1009 } |
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1010 } |
342 | 1011 } |
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1012 |
342 | 1013 bool new_in_marking_window = _in_marking_window; |
1014 bool new_in_marking_window_im = false; | |
1359
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1015 if (during_initial_mark_pause()) { |
342 | 1016 new_in_marking_window = true; |
1017 new_in_marking_window_im = true; | |
1018 } | |
1019 | |
4710 | 1020 if (_last_young_gc) { |
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1021 // This is supposed to to be the "last young GC" before we start |
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1022 // doing mixed GCs. Here we decide whether to start mixed GCs or not. |
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1023 |
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1024 if (!last_pause_included_initial_mark) { |
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1025 if (next_gc_should_be_mixed("start mixed GCs", |
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1026 "do not start mixed GCs")) { |
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1027 set_gcs_are_young(false); |
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1028 } |
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1029 } else { |
4710 | 1030 ergo_verbose0(ErgoMixedGCs, |
1031 "do not start mixed GCs", | |
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1032 ergo_format_reason("concurrent cycle is about to start")); |
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1033 } |
4710 | 1034 _last_young_gc = false; |
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1035 } |
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1036 |
4710 | 1037 if (!_last_gc_was_young) { |
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1038 // This is a mixed GC. Here we decide whether to continue doing |
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1039 // mixed GCs or not. |
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1040 |
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1041 if (!next_gc_should_be_mixed("continue mixed GCs", |
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1042 "do not continue mixed GCs")) { |
4710 | 1043 set_gcs_are_young(true); |
342 | 1044 } |
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1045 } |
4710 | 1046 |
342 | 1047 _short_lived_surv_rate_group->start_adding_regions(); |
1048 // do that for any other surv rate groupsx | |
1049 | |
677 | 1050 if (update_stats) { |
342 | 1051 double cost_per_card_ms = 0.0; |
1052 if (_pending_cards > 0) { | |
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1053 cost_per_card_ms = phase_times()->average_last_update_rs_time() / (double) _pending_cards; |
342 | 1054 _cost_per_card_ms_seq->add(cost_per_card_ms); |
1055 } | |
1056 | |
1057 size_t cards_scanned = _g1->cards_scanned(); | |
1058 | |
1059 double cost_per_entry_ms = 0.0; | |
1060 if (cards_scanned > 10) { | |
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1061 cost_per_entry_ms = phase_times()->average_last_scan_rs_time() / (double) cards_scanned; |
4710 | 1062 if (_last_gc_was_young) { |
342 | 1063 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1064 } else { |
1065 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1066 } | |
342 | 1067 } |
1068 | |
1069 if (_max_rs_lengths > 0) { | |
1070 double cards_per_entry_ratio = | |
1071 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1072 if (_last_gc_was_young) { |
1073 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1074 } else { | |
1075 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1076 } | |
342 | 1077 } |
1078 | |
4727
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1079 // This is defensive. For a while _max_rs_lengths could get |
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1080 // smaller than _recorded_rs_lengths which was causing |
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1081 // rs_length_diff to get very large and mess up the RSet length |
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1082 // predictions. The reason was unsafe concurrent updates to the |
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1083 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1084 // against (see CR 7118202). This bug has now been fixed (see CR |
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1085 // 7119027). However, I'm still worried that |
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1086 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1087 // inaccurate. The concurrent refinement thread calculates an |
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1088 // RSet's length concurrently with other CR threads updating it |
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1089 // which might cause it to calculate the length incorrectly (if, |
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1090 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1091 // conditional below just in case. |
4130
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1092 size_t rs_length_diff = 0; |
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1093 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1094 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1095 } |
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1096 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1097 |
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1098 size_t freed_bytes = _heap_used_bytes_before_gc - cur_used_bytes; |
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1099 size_t copied_bytes = _collection_set_bytes_used_before - freed_bytes; |
342 | 1100 double cost_per_byte_ms = 0.0; |
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1101 |
342 | 1102 if (copied_bytes > 0) { |
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1103 cost_per_byte_ms = phase_times()->average_last_obj_copy_time() / (double) copied_bytes; |
4710 | 1104 if (_in_marking_window) { |
342 | 1105 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1106 } else { |
342 | 1107 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1108 } |
342 | 1109 } |
1110 | |
1111 double all_other_time_ms = pause_time_ms - | |
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1112 (phase_times()->average_last_update_rs_time() + phase_times()->average_last_scan_rs_time() |
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1113 + phase_times()->average_last_obj_copy_time() + phase_times()->average_last_termination_time()); |
342 | 1114 |
1115 double young_other_time_ms = 0.0; | |
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1116 if (young_cset_region_length() > 0) { |
342 | 1117 young_other_time_ms = |
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1118 phase_times()->young_cset_choice_time_ms() + |
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1119 phase_times()->young_free_cset_time_ms(); |
342 | 1120 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
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1121 (double) young_cset_region_length()); |
342 | 1122 } |
1123 double non_young_other_time_ms = 0.0; | |
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1124 if (old_cset_region_length() > 0) { |
342 | 1125 non_young_other_time_ms = |
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1126 phase_times()->non_young_cset_choice_time_ms() + |
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1127 phase_times()->non_young_free_cset_time_ms(); |
342 | 1128 |
1129 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1130 (double) old_cset_region_length()); |
342 | 1131 } |
1132 | |
1133 double constant_other_time_ms = all_other_time_ms - | |
1134 (young_other_time_ms + non_young_other_time_ms); | |
1135 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1136 | |
1137 double survival_ratio = 0.0; | |
6611 | 1138 if (_collection_set_bytes_used_before > 0) { |
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1139 survival_ratio = (double) _bytes_copied_during_gc / |
6611 | 1140 (double) _collection_set_bytes_used_before; |
342 | 1141 } |
1142 | |
1143 _pending_cards_seq->add((double) _pending_cards); | |
1144 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1145 } | |
1146 | |
1147 _in_marking_window = new_in_marking_window; | |
1148 _in_marking_window_im = new_in_marking_window_im; | |
1149 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1150 update_young_list_target_length(); |
342 | 1151 |
1111 | 1152 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1153 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
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1154 adjust_concurrent_refinement(phase_times()->average_last_update_rs_time(), |
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1155 phase_times()->sum_last_update_rs_processed_buffers(), update_rs_time_goal_ms); |
4013 | 1156 |
6011 | 1157 _collectionSetChooser->verify(); |
342 | 1158 } |
1159 | |
6059 | 1160 #define EXT_SIZE_FORMAT "%.1f%s" |
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1161 #define EXT_SIZE_PARAMS(bytes) \ |
6059 | 1162 byte_size_in_proper_unit((double)(bytes)), \ |
3764
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1163 proper_unit_for_byte_size((bytes)) |
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1164 |
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1165 void G1CollectorPolicy::record_heap_size_info_at_start(bool full) { |
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1166 YoungList* young_list = _g1->young_list(); |
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1167 _eden_used_bytes_before_gc = young_list->eden_used_bytes(); |
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1168 _survivor_used_bytes_before_gc = young_list->survivor_used_bytes(); |
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1169 _heap_capacity_bytes_before_gc = _g1->capacity(); |
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1170 _heap_used_bytes_before_gc = _g1->used(); |
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1171 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); |
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1172 |
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1173 _eden_capacity_bytes_before_gc = |
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1174 (_young_list_target_length * HeapRegion::GrainBytes) - _survivor_used_bytes_before_gc; |
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1175 |
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1176 if (full) { |
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1177 _metaspace_used_bytes_before_gc = MetaspaceAux::allocated_used_bytes(); |
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1178 } |
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1179 } |
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1180 |
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1181 void G1CollectorPolicy::print_heap_transition() { |
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1182 _g1->print_size_transition(gclog_or_tty, |
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1183 _heap_used_bytes_before_gc, |
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1184 _g1->used(), |
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1185 _g1->capacity()); |
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1186 } |
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1187 |
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1188 void G1CollectorPolicy::print_detailed_heap_transition(bool full) { |
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1189 YoungList* young_list = _g1->young_list(); |
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1190 |
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1191 size_t eden_used_bytes_after_gc = young_list->eden_used_bytes(); |
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1192 size_t survivor_used_bytes_after_gc = young_list->survivor_used_bytes(); |
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1193 size_t heap_used_bytes_after_gc = _g1->used(); |
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1194 |
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1195 size_t heap_capacity_bytes_after_gc = _g1->capacity(); |
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1196 size_t eden_capacity_bytes_after_gc = |
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1197 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_used_bytes_after_gc; |
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1198 |
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1199 gclog_or_tty->print( |
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1200 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1201 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1202 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1203 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1204 EXT_SIZE_PARAMS(_eden_used_bytes_before_gc), |
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1205 EXT_SIZE_PARAMS(_eden_capacity_bytes_before_gc), |
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1206 EXT_SIZE_PARAMS(eden_used_bytes_after_gc), |
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1207 EXT_SIZE_PARAMS(eden_capacity_bytes_after_gc), |
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1208 EXT_SIZE_PARAMS(_survivor_used_bytes_before_gc), |
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1209 EXT_SIZE_PARAMS(survivor_used_bytes_after_gc), |
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1210 EXT_SIZE_PARAMS(_heap_used_bytes_before_gc), |
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1211 EXT_SIZE_PARAMS(_heap_capacity_bytes_before_gc), |
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1212 EXT_SIZE_PARAMS(heap_used_bytes_after_gc), |
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1213 EXT_SIZE_PARAMS(heap_capacity_bytes_after_gc)); |
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1214 |
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1215 if (full) { |
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1216 MetaspaceAux::print_metaspace_change(_metaspace_used_bytes_before_gc); |
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1217 } |
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1218 |
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1219 gclog_or_tty->cr(); |
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1220 } |
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1221 |
1111 | 1222 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1223 double update_rs_processed_buffers, | |
1224 double goal_ms) { | |
1225 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1226 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1227 | |
1282 | 1228 if (G1UseAdaptiveConcRefinement) { |
1111 | 1229 const int k_gy = 3, k_gr = 6; |
1230 const double inc_k = 1.1, dec_k = 0.9; | |
1231 | |
1232 int g = cg1r->green_zone(); | |
1233 if (update_rs_time > goal_ms) { | |
1234 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1235 } else { | |
1236 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1237 g = (int)MAX2(g * inc_k, g + 1.0); | |
1238 } | |
1239 } | |
1240 // Change the refinement threads params | |
1241 cg1r->set_green_zone(g); | |
1242 cg1r->set_yellow_zone(g * k_gy); | |
1243 cg1r->set_red_zone(g * k_gr); | |
1244 cg1r->reinitialize_threads(); | |
1245 | |
1246 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1247 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1248 cg1r->yellow_zone()); | |
1249 // Change the barrier params | |
1250 dcqs.set_process_completed_threshold(processing_threshold); | |
1251 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1252 } | |
1253 | |
1254 int curr_queue_size = dcqs.completed_buffers_num(); | |
1255 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1256 dcqs.set_completed_queue_padding(curr_queue_size); | |
1257 } else { | |
1258 dcqs.set_completed_queue_padding(0); | |
1259 } | |
1260 dcqs.notify_if_necessary(); | |
1261 } | |
1262 | |
342 | 1263 double |
1264 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1265 size_t scanned_cards) { | |
1266 return | |
1267 predict_rs_update_time_ms(pending_cards) + | |
1268 predict_rs_scan_time_ms(scanned_cards) + | |
1269 predict_constant_other_time_ms(); | |
1270 } | |
1271 | |
1272 double | |
6611 | 1273 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { |
1274 size_t rs_length = predict_rs_length_diff(); | |
342 | 1275 size_t card_num; |
4710 | 1276 if (gcs_are_young()) { |
342 | 1277 card_num = predict_young_card_num(rs_length); |
4710 | 1278 } else { |
342 | 1279 card_num = predict_non_young_card_num(rs_length); |
4710 | 1280 } |
6611 | 1281 return predict_base_elapsed_time_ms(pending_cards, card_num); |
342 | 1282 } |
1283 | |
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1284 size_t G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
342 | 1285 size_t bytes_to_copy; |
1286 if (hr->is_marked()) | |
1287 bytes_to_copy = hr->max_live_bytes(); | |
1288 else { | |
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1289 assert(hr->is_young() && hr->age_in_surv_rate_group() != -1, "invariant"); |
342 | 1290 int age = hr->age_in_surv_rate_group(); |
545 | 1291 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1292 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1293 } | |
1294 return bytes_to_copy; | |
1295 } | |
1296 | |
6611 | 1297 double |
1298 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1299 bool for_young_gc) { | |
1300 size_t rs_length = hr->rem_set()->occupied(); | |
1301 size_t card_num; | |
1302 | |
1303 // Predicting the number of cards is based on which type of GC | |
1304 // we're predicting for. | |
1305 if (for_young_gc) { | |
1306 card_num = predict_young_card_num(rs_length); | |
1307 } else { | |
1308 card_num = predict_non_young_card_num(rs_length); | |
1309 } | |
1310 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1311 | |
1312 double region_elapsed_time_ms = | |
1313 predict_rs_scan_time_ms(card_num) + | |
1314 predict_object_copy_time_ms(bytes_to_copy); | |
1315 | |
1316 // The prediction of the "other" time for this region is based | |
1317 // upon the region type and NOT the GC type. | |
1318 if (hr->is_young()) { | |
1319 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1320 } else { | |
1321 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1322 } | |
1323 return region_elapsed_time_ms; | |
1324 } | |
1325 | |
342 | 1326 void |
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1327 G1CollectorPolicy::init_cset_region_lengths(uint eden_cset_region_length, |
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1328 uint survivor_cset_region_length) { |
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1329 _eden_cset_region_length = eden_cset_region_length; |
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1330 _survivor_cset_region_length = survivor_cset_region_length; |
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1331 _old_cset_region_length = 0; |
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1332 } |
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1333 |
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1334 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1335 _recorded_rs_lengths = rs_lengths; |
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1336 } |
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1337 |
342 | 1338 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
1339 double elapsed_ms) { | |
1340 _recent_gc_times_ms->add(elapsed_ms); | |
1341 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1342 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1343 } | |
1344 | |
1345 size_t G1CollectorPolicy::expansion_amount() { | |
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1346 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1347 double threshold = _gc_overhead_perc; |
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1348 if (recent_gc_overhead > threshold) { |
751 | 1349 // We will double the existing space, or take |
1350 // G1ExpandByPercentOfAvailable % of the available expansion | |
1351 // space, whichever is smaller, bounded below by a minimum | |
1352 // expansion (unless that's all that's left.) | |
342 | 1353 const size_t min_expand_bytes = 1*M; |
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1354 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1355 size_t committed_bytes = _g1->capacity(); |
1356 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1357 size_t expand_bytes; | |
1358 size_t expand_bytes_via_pct = | |
751 | 1359 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1360 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1361 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1362 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1363 |
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1364 ergo_verbose5(ErgoHeapSizing, |
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1365 "attempt heap expansion", |
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1366 ergo_format_reason("recent GC overhead higher than " |
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1367 "threshold after GC") |
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1368 ergo_format_perc("recent GC overhead") |
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1369 ergo_format_perc("threshold") |
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1370 ergo_format_byte("uncommitted") |
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1371 ergo_format_byte_perc("calculated expansion amount"), |
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1372 recent_gc_overhead, threshold, |
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1373 uncommitted_bytes, |
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1374 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1375 |
342 | 1376 return expand_bytes; |
1377 } else { | |
1378 return 0; | |
1379 } | |
1380 } | |
1381 | |
1382 void G1CollectorPolicy::print_tracing_info() const { | |
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1383 _trace_gen0_time_data.print(); |
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1384 _trace_gen1_time_data.print(); |
342 | 1385 } |
1386 | |
1387 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
1388 #ifndef PRODUCT | |
1389 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
1390 // add this call for any other surv rate groups | |
1391 #endif // PRODUCT | |
1392 } | |
1393 | |
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1394 uint G1CollectorPolicy::max_regions(int purpose) { |
342 | 1395 switch (purpose) { |
1396 case GCAllocForSurvived: | |
545 | 1397 return _max_survivor_regions; |
342 | 1398 case GCAllocForTenured: |
545 | 1399 return REGIONS_UNLIMITED; |
342 | 1400 default: |
545 | 1401 ShouldNotReachHere(); |
1402 return REGIONS_UNLIMITED; | |
342 | 1403 }; |
1404 } | |
1405 | |
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1406 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
6010
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1407 uint expansion_region_num = 0; |
1991
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1408 if (GCLockerEdenExpansionPercent > 0) { |
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1409 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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1410 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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1411 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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1412 // less than 1.0) we'll get 1. |
6010
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1413 expansion_region_num = (uint) ceil(expansion_region_num_d); |
1991
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1414 } else { |
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1415 assert(expansion_region_num == 0, "sanity"); |
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1416 } |
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1417 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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1418 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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1419 } |
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1420 |
545 | 1421 // Calculates survivor space parameters. |
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1422 void G1CollectorPolicy::update_survivors_policy() { |
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1423 double max_survivor_regions_d = |
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1424 (double) _young_list_target_length / (double) SurvivorRatio; |
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1425 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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1426 // smaller than 1.0) we'll get 1. |
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1427 _max_survivor_regions = (uint) ceil(max_survivor_regions_d); |
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1428 |
3868
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1429 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 1430 HeapRegion::GrainWords * _max_survivor_regions); |
1431 } | |
1432 | |
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1433 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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1434 GCCause::Cause gc_cause) { |
1656
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1435 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1436 if (!during_cycle) { |
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1437 ergo_verbose1(ErgoConcCycles, |
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1438 "request concurrent cycle initiation", |
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1439 ergo_format_reason("requested by GC cause") |
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1440 ergo_format_str("GC cause"), |
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1441 GCCause::to_string(gc_cause)); |
1656
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|
1442 set_initiate_conc_mark_if_possible(); |
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|
1443 return true; |
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|
1444 } else { |
3914
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1445 ergo_verbose1(ErgoConcCycles, |
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1446 "do not request concurrent cycle initiation", |
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1447 ergo_format_reason("concurrent cycle already in progress") |
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1448 ergo_format_str("GC cause"), |
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1449 GCCause::to_string(gc_cause)); |
1656
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|
1450 return false; |
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|
1451 } |
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|
1452 } |
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|
1453 |
342 | 1454 void |
1359
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1455 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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1456 // We are about to decide on whether this pause will be an |
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1457 // initial-mark pause. |
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1458 |
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1459 // First, during_initial_mark_pause() should not be already set. We |
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1460 // will set it here if we have to. However, it should be cleared by |
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1461 // the end of the pause (it's only set for the duration of an |
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1462 // initial-mark pause). |
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1463 assert(!during_initial_mark_pause(), "pre-condition"); |
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1464 |
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1465 if (initiate_conc_mark_if_possible()) { |
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1466 // We had noticed on a previous pause that the heap occupancy has |
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1467 // gone over the initiating threshold and we should start a |
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1468 // concurrent marking cycle. So we might initiate one. |
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1469 |
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|
1470 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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1471 if (!during_cycle) { |
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1472 // The concurrent marking thread is not "during a cycle", i.e., |
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1473 // it has completed the last one. So we can go ahead and |
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1474 // initiate a new cycle. |
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1475 |
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|
1476 set_during_initial_mark_pause(); |
4710 | 1477 // We do not allow mixed GCs during marking. |
1478 if (!gcs_are_young()) { | |
1479 set_gcs_are_young(true); | |
1480 ergo_verbose0(ErgoMixedGCs, | |
1481 "end mixed GCs", | |
3982
273b46400613
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|
1482 ergo_format_reason("concurrent cycle is about to start")); |
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|
1483 } |
1359
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1484 |
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1485 // And we can now clear initiate_conc_mark_if_possible() as |
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1486 // we've already acted on it. |
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|
1487 clear_initiate_conc_mark_if_possible(); |
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1488 |
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1489 ergo_verbose0(ErgoConcCycles, |
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1490 "initiate concurrent cycle", |
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|
1491 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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1492 } else { |
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1493 // The concurrent marking thread is still finishing up the |
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1494 // previous cycle. If we start one right now the two cycles |
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1495 // overlap. In particular, the concurrent marking thread might |
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1496 // be in the process of clearing the next marking bitmap (which |
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1497 // we will use for the next cycle if we start one). Starting a |
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1498 // cycle now will be bad given that parts of the marking |
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1499 // information might get cleared by the marking thread. And we |
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1500 // cannot wait for the marking thread to finish the cycle as it |
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1501 // periodically yields while clearing the next marking bitmap |
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1502 // and, if it's in a yield point, it's waiting for us to |
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1503 // finish. So, at this point we will not start a cycle and we'll |
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1504 // let the concurrent marking thread complete the last one. |
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1505 ergo_verbose0(ErgoConcCycles, |
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1506 "do not initiate concurrent cycle", |
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|
1507 ergo_format_reason("concurrent cycle already in progress")); |
1359
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1508 } |
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1509 } |
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1510 } |
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1511 |
342 | 1512 class KnownGarbageClosure: public HeapRegionClosure { |
4912
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1513 G1CollectedHeap* _g1h; |
342 | 1514 CollectionSetChooser* _hrSorted; |
1515 | |
1516 public: | |
1517 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
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|
1518 _g1h(G1CollectedHeap::heap()), _hrSorted(hrSorted) { } |
342 | 1519 |
1520 bool doHeapRegion(HeapRegion* r) { | |
1521 // We only include humongous regions in collection | |
1522 // sets when concurrent mark shows that their contained object is | |
1523 // unreachable. | |
1524 | |
1525 // Do we have any marking information for this region? | |
1526 if (r->is_marked()) { | |
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1527 // We will skip any region that's currently used as an old GC |
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1528 // alloc region (we should not consider those for collection |
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|
1529 // before we fill them up). |
6011 | 1530 if (_hrSorted->should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
1531 _hrSorted->add_region(r); | |
342 | 1532 } |
1533 } | |
1534 return false; | |
1535 } | |
1536 }; | |
1537 | |
1538 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
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1539 G1CollectedHeap* _g1h; |
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1540 CSetChooserParUpdater _cset_updater; |
342 | 1541 |
1542 public: | |
1543 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
6011 | 1544 uint chunk_size) : |
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1545 _g1h(G1CollectedHeap::heap()), |
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1546 _cset_updater(hrSorted, true /* parallel */, chunk_size) { } |
342 | 1547 |
1548 bool doHeapRegion(HeapRegion* r) { | |
1549 // Do we have any marking information for this region? | |
1550 if (r->is_marked()) { | |
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1551 // We will skip any region that's currently used as an old GC |
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1552 // alloc region (we should not consider those for collection |
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1553 // before we fill them up). |
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1554 if (_cset_updater.should_add(r) && !_g1h->is_old_gc_alloc_region(r)) { |
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1555 _cset_updater.add_region(r); |
342 | 1556 } |
1557 } | |
1558 return false; | |
1559 } | |
1560 }; | |
1561 | |
1562 class ParKnownGarbageTask: public AbstractGangTask { | |
1563 CollectionSetChooser* _hrSorted; | |
6011 | 1564 uint _chunk_size; |
342 | 1565 G1CollectedHeap* _g1; |
1566 public: | |
6011 | 1567 ParKnownGarbageTask(CollectionSetChooser* hrSorted, uint chunk_size) : |
342 | 1568 AbstractGangTask("ParKnownGarbageTask"), |
1569 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
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1570 _g1(G1CollectedHeap::heap()) { } |
342 | 1571 |
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1572 void work(uint worker_id) { |
6011 | 1573 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size); |
1574 | |
342 | 1575 // Back to zero for the claim value. |
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1576 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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1577 _g1->workers()->active_workers(), |
355 | 1578 HeapRegion::InitialClaimValue); |
342 | 1579 } |
1580 }; | |
1581 | |
1582 void | |
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1583 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
6011 | 1584 _collectionSetChooser->clear(); |
4013 | 1585 |
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1586 uint region_num = _g1->n_regions(); |
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1587 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1588 const uint OverpartitionFactor = 4; |
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1589 uint WorkUnit; |
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1590 // The use of MinChunkSize = 8 in the original code |
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1591 // causes some assertion failures when the total number of |
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1592 // region is less than 8. The code here tries to fix that. |
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1593 // Should the original code also be fixed? |
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1594 if (no_of_gc_threads > 0) { |
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1595 const uint MinWorkUnit = MAX2(region_num / no_of_gc_threads, 1U); |
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1596 WorkUnit = MAX2(region_num / (no_of_gc_threads * OverpartitionFactor), |
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1597 MinWorkUnit); |
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1598 } else { |
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1599 assert(no_of_gc_threads > 0, |
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1600 "The active gc workers should be greater than 0"); |
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1601 // In a product build do something reasonable to avoid a crash. |
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1602 const uint MinWorkUnit = MAX2(region_num / (uint) ParallelGCThreads, 1U); |
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1603 WorkUnit = |
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1604 MAX2(region_num / (uint) (ParallelGCThreads * OverpartitionFactor), |
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1605 MinWorkUnit); |
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1606 } |
6011 | 1607 _collectionSetChooser->prepare_for_par_region_addition(_g1->n_regions(), |
1608 WorkUnit); | |
342 | 1609 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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1610 (int) WorkUnit); |
342 | 1611 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 1612 |
1613 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
1614 "sanity check"); | |
342 | 1615 } else { |
1616 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
1617 _g1->heap_region_iterate(&knownGarbagecl); | |
1618 } | |
4013 | 1619 |
6011 | 1620 _collectionSetChooser->sort_regions(); |
1621 | |
4013 | 1622 double end_sec = os::elapsedTime(); |
1623 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; | |
1624 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1625 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1626 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1627 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 1628 } |
1629 | |
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1630 // Add the heap region at the head of the non-incremental collection set |
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1631 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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1632 assert(_inc_cset_build_state == Active, "Precondition"); |
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1633 assert(!hr->is_young(), "non-incremental add of young region"); |
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1634 |
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1635 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 1636 hr->set_in_collection_set(true); |
1637 hr->set_next_in_collection_set(_collection_set); | |
1638 _collection_set = hr; | |
1639 _collection_set_bytes_used_before += hr->used(); | |
526 | 1640 _g1->register_region_with_in_cset_fast_test(hr); |
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1641 size_t rs_length = hr->rem_set()->occupied(); |
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1642 _recorded_rs_lengths += rs_length; |
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1643 _old_cset_region_length += 1; |
342 | 1644 } |
1645 | |
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1646 // Initialize the per-collection-set information |
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1647 void G1CollectorPolicy::start_incremental_cset_building() { |
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1648 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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1649 |
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1650 _inc_cset_head = NULL; |
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1651 _inc_cset_tail = NULL; |
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1652 _inc_cset_bytes_used_before = 0; |
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1653 |
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1654 _inc_cset_max_finger = 0; |
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1655 _inc_cset_recorded_rs_lengths = 0; |
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1656 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1657 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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1658 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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1659 _inc_cset_build_state = Active; |
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1660 } |
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1661 |
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1662 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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1663 assert(_inc_cset_build_state == Active, "Precondition"); |
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1664 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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1665 |
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1666 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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1667 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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1668 // that adds a new region to the CSet. Further updates by the |
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1669 // concurrent refinement thread that samples the young RSet lengths |
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1670 // are accumulated in the *_diffs fields. Here we add the diffs to |
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1671 // the "main" fields. |
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1672 |
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1673 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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1674 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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1675 } else { |
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1676 // This is defensive. The diff should in theory be always positive |
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1677 // as RSets can only grow between GCs. However, given that we |
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1678 // sample their size concurrently with other threads updating them |
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1679 // it's possible that we might get the wrong size back, which |
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1680 // could make the calculations somewhat inaccurate. |
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1681 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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1682 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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1683 _inc_cset_recorded_rs_lengths -= diffs; |
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1684 } else { |
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1685 _inc_cset_recorded_rs_lengths = 0; |
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1686 } |
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1687 } |
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1688 _inc_cset_predicted_elapsed_time_ms += |
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1689 _inc_cset_predicted_elapsed_time_ms_diffs; |
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1690 |
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1691 _inc_cset_recorded_rs_lengths_diffs = 0; |
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1692 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
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1693 } |
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1694 |
1394
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1695 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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1696 // This routine is used when: |
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1697 // * adding survivor regions to the incremental cset at the end of an |
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1698 // evacuation pause, |
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1699 // * adding the current allocation region to the incremental cset |
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1700 // when it is retired, and |
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1701 // * updating existing policy information for a region in the |
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1702 // incremental cset via young list RSet sampling. |
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|
1703 // Therefore this routine may be called at a safepoint by the |
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|
1704 // VM thread, or in-between safepoints by mutator threads (when |
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|
1705 // retiring the current allocation region) or a concurrent |
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|
1706 // refine thread (RSet sampling). |
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|
1707 |
6611 | 1708 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
1394
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1709 size_t used_bytes = hr->used(); |
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|
1710 _inc_cset_recorded_rs_lengths += rs_length; |
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|
1711 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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|
1712 _inc_cset_bytes_used_before += used_bytes; |
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|
1713 |
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|
1714 // Cache the values we have added to the aggregated informtion |
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1715 // in the heap region in case we have to remove this region from |
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1716 // the incremental collection set, or it is updated by the |
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|
1717 // rset sampling code |
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|
1718 hr->set_recorded_rs_length(rs_length); |
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1719 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
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|
1720 } |
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|
1721 |
4727
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1722 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
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1723 size_t new_rs_length) { |
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1724 // Update the CSet information that is dependent on the new RS length |
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1725 assert(hr->is_young(), "Precondition"); |
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|
1726 assert(!SafepointSynchronize::is_at_safepoint(), |
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|
1727 "should not be at a safepoint"); |
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|
1728 |
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1729 // We could have updated _inc_cset_recorded_rs_lengths and |
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1730 // _inc_cset_predicted_elapsed_time_ms directly but we'd need to do |
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1731 // that atomically, as this code is executed by a concurrent |
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1732 // refinement thread, potentially concurrently with a mutator thread |
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1733 // allocating a new region and also updating the same fields. To |
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|
1734 // avoid the atomic operations we accumulate these updates on two |
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1735 // separate fields (*_diffs) and we'll just add them to the "main" |
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|
1736 // fields at the start of a GC. |
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|
1737 |
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|
1738 ssize_t old_rs_length = (ssize_t) hr->recorded_rs_length(); |
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|
1739 ssize_t rs_lengths_diff = (ssize_t) new_rs_length - old_rs_length; |
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1740 _inc_cset_recorded_rs_lengths_diffs += rs_lengths_diff; |
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|
1741 |
1394
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1742 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
6611 | 1743 double new_region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
4727
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1744 double elapsed_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms; |
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1745 _inc_cset_predicted_elapsed_time_ms_diffs += elapsed_ms_diff; |
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|
1746 |
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|
1747 hr->set_recorded_rs_length(new_rs_length); |
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|
1748 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
1394
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|
1749 } |
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|
1750 |
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|
1751 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
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|
1752 assert(hr->is_young(), "invariant"); |
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|
1753 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
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|
1754 assert(_inc_cset_build_state == Active, "Precondition"); |
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|
1755 |
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|
1756 // We need to clear and set the cached recorded/cached collection set |
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|
1757 // information in the heap region here (before the region gets added |
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|
1758 // to the collection set). An individual heap region's cached values |
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1759 // are calculated, aggregated with the policy collection set info, |
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|
1760 // and cached in the heap region here (initially) and (subsequently) |
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|
1761 // by the Young List sampling code. |
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|
1762 |
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|
1763 size_t rs_length = hr->rem_set()->occupied(); |
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|
1764 add_to_incremental_cset_info(hr, rs_length); |
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|
1765 |
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|
1766 HeapWord* hr_end = hr->end(); |
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|
1767 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
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|
1768 |
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|
1769 assert(!hr->in_collection_set(), "invariant"); |
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|
1770 hr->set_in_collection_set(true); |
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|
1771 assert( hr->next_in_collection_set() == NULL, "invariant"); |
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|
1772 |
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|
1773 _g1->register_region_with_in_cset_fast_test(hr); |
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|
1774 } |
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|
1775 |
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|
1776 // Add the region at the RHS of the incremental cset |
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|
1777 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
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|
1778 // We should only ever be appending survivors at the end of a pause |
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|
1779 assert( hr->is_survivor(), "Logic"); |
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|
1780 |
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|
1781 // Do the 'common' stuff |
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|
1782 add_region_to_incremental_cset_common(hr); |
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|
1783 |
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|
1784 // Now add the region at the right hand side |
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|
1785 if (_inc_cset_tail == NULL) { |
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|
1786 assert(_inc_cset_head == NULL, "invariant"); |
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|
1787 _inc_cset_head = hr; |
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|
1788 } else { |
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|
1789 _inc_cset_tail->set_next_in_collection_set(hr); |
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|
1790 } |
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|
1791 _inc_cset_tail = hr; |
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|
1792 } |
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|
1793 |
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|
1794 // Add the region to the LHS of the incremental cset |
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|
1795 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
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|
1796 // Survivors should be added to the RHS at the end of a pause |
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|
1797 assert(!hr->is_survivor(), "Logic"); |
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|
1798 |
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|
1799 // Do the 'common' stuff |
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|
1800 add_region_to_incremental_cset_common(hr); |
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|
1801 |
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|
1802 // Add the region at the left hand side |
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|
1803 hr->set_next_in_collection_set(_inc_cset_head); |
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1804 if (_inc_cset_head == NULL) { |
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|
1805 assert(_inc_cset_tail == NULL, "Invariant"); |
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|
1806 _inc_cset_tail = hr; |
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|
1807 } |
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|
1808 _inc_cset_head = hr; |
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|
1809 } |
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|
1810 |
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|
1811 #ifndef PRODUCT |
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|
1812 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
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|
1813 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
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|
1814 |
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|
1815 st->print_cr("\nCollection_set:"); |
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|
1816 HeapRegion* csr = list_head; |
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|
1817 while (csr != NULL) { |
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|
1818 HeapRegion* next = csr->next_in_collection_set(); |
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1819 assert(csr->in_collection_set(), "bad CS"); |
6027
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1820 st->print_cr(" "HR_FORMAT", P: "PTR_FORMAT "N: "PTR_FORMAT", age: %4d", |
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1821 HR_FORMAT_PARAMS(csr), |
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1822 csr->prev_top_at_mark_start(), csr->next_top_at_mark_start(), |
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1823 csr->age_in_surv_rate_group_cond()); |
1394
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1824 csr = next; |
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1825 } |
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1826 } |
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|
1827 #endif // !PRODUCT |
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|
1828 |
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1829 double G1CollectorPolicy::reclaimable_bytes_perc(size_t reclaimable_bytes) { |
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1830 // Returns the given amount of reclaimable bytes (that represents |
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1831 // the amount of reclaimable space still to be collected) as a |
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1832 // percentage of the current heap capacity. |
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1833 size_t capacity_bytes = _g1->capacity(); |
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1834 return (double) reclaimable_bytes * 100.0 / (double) capacity_bytes; |
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1835 } |
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1836 |
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1837 bool G1CollectorPolicy::next_gc_should_be_mixed(const char* true_action_str, |
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1838 const char* false_action_str) { |
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1839 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1840 if (cset_chooser->is_empty()) { |
4912
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1841 ergo_verbose0(ErgoMixedGCs, |
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1842 false_action_str, |
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1843 ergo_format_reason("candidate old regions not available")); |
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1844 return false; |
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1845 } |
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1846 |
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1847 // Is the amount of uncollected reclaimable space above G1HeapWastePercent? |
6011 | 1848 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
8681
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1849 double reclaimable_perc = reclaimable_bytes_perc(reclaimable_bytes); |
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1850 double threshold = (double) G1HeapWastePercent; |
8681
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1851 if (reclaimable_perc <= threshold) { |
4912
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1852 ergo_verbose4(ErgoMixedGCs, |
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1853 false_action_str, |
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1854 ergo_format_reason("reclaimable percentage not over threshold") |
4912
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1855 ergo_format_region("candidate old regions") |
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1856 ergo_format_byte_perc("reclaimable") |
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1857 ergo_format_perc("threshold"), |
6011 | 1858 cset_chooser->remaining_regions(), |
8681
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1859 reclaimable_bytes, |
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1860 reclaimable_perc, threshold); |
4912
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1861 return false; |
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1862 } |
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1863 |
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1864 ergo_verbose4(ErgoMixedGCs, |
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1865 true_action_str, |
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1866 ergo_format_reason("candidate old regions available") |
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1867 ergo_format_region("candidate old regions") |
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1868 ergo_format_byte_perc("reclaimable") |
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1869 ergo_format_perc("threshold"), |
6011 | 1870 cset_chooser->remaining_regions(), |
8681
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1871 reclaimable_bytes, |
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1872 reclaimable_perc, threshold); |
4912
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1873 return true; |
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1874 } |
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1875 |
8681
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1876 uint G1CollectorPolicy::calc_min_old_cset_length() { |
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1877 // The min old CSet region bound is based on the maximum desired |
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1878 // number of mixed GCs after a cycle. I.e., even if some old regions |
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1879 // look expensive, we should add them to the CSet anyway to make |
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1880 // sure we go through the available old regions in no more than the |
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1881 // maximum desired number of mixed GCs. |
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1882 // |
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1883 // The calculation is based on the number of marked regions we added |
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1884 // to the CSet chooser in the first place, not how many remain, so |
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1885 // that the result is the same during all mixed GCs that follow a cycle. |
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1886 |
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1887 const size_t region_num = (size_t) _collectionSetChooser->length(); |
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1888 const size_t gc_num = (size_t) MAX2(G1MixedGCCountTarget, (uintx) 1); |
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1889 size_t result = region_num / gc_num; |
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1890 // emulate ceiling |
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1891 if (result * gc_num < region_num) { |
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1892 result += 1; |
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|
1893 } |
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|
1894 return (uint) result; |
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|
1895 } |
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|
1896 |
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1897 uint G1CollectorPolicy::calc_max_old_cset_length() { |
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1898 // The max old CSet region bound is based on the threshold expressed |
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1899 // as a percentage of the heap size. I.e., it should bound the |
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1900 // number of old regions added to the CSet irrespective of how many |
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|
1901 // of them are available. |
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|
1902 |
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1903 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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1904 const size_t region_num = g1h->n_regions(); |
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1905 const size_t perc = (size_t) G1OldCSetRegionThresholdPercent; |
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1906 size_t result = region_num * perc / 100; |
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1907 // emulate ceiling |
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1908 if (100 * result < region_num * perc) { |
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1909 result += 1; |
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|
1910 } |
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1911 return (uint) result; |
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|
1912 } |
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|
1913 |
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1914 |
10405 | 1915 void G1CollectorPolicy::finalize_cset(double target_pause_time_ms, EvacuationInfo& evacuation_info) { |
6611 | 1916 double young_start_time_sec = os::elapsedTime(); |
1394
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1917 |
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1918 YoungList* young_list = _g1->young_list(); |
4727
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|
1919 finalize_incremental_cset_building(); |
3914
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1920 |
1656
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1921 guarantee(target_pause_time_ms > 0.0, |
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1922 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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|
1923 target_pause_time_ms)); |
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|
1924 guarantee(_collection_set == NULL, "Precondition"); |
342 | 1925 |
1926 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
1927 double predicted_pause_time_ms = base_time_ms; | |
8681
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|
1928 double time_remaining_ms = MAX2(target_pause_time_ms - base_time_ms, 0.0); |
342 | 1929 |
6611 | 1930 ergo_verbose4(ErgoCSetConstruction | ErgoHigh, |
3914
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1931 "start choosing CSet", |
6611 | 1932 ergo_format_size("_pending_cards") |
3914
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1933 ergo_format_ms("predicted base time") |
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1934 ergo_format_ms("remaining time") |
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1935 ergo_format_ms("target pause time"), |
6611 | 1936 _pending_cards, base_time_ms, time_remaining_ms, target_pause_time_ms); |
3914
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1937 |
4710 | 1938 _last_gc_was_young = gcs_are_young() ? true : false; |
1939 | |
1940 if (_last_gc_was_young) { | |
6109
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1941 _trace_gen0_time_data.increment_young_collection_count(); |
3914
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|
1942 } else { |
6109
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|
1943 _trace_gen0_time_data.increment_mixed_collection_count(); |
3914
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|
1944 } |
3867
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|
1945 |
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|
1946 // The young list is laid with the survivor regions from the previous |
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1947 // pause are appended to the RHS of the young list, i.e. |
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1948 // [Newly Young Regions ++ Survivors from last pause]. |
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|
1949 |
6010
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|
1950 uint survivor_region_length = young_list->survivor_length(); |
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|
1951 uint eden_region_length = young_list->length() - survivor_region_length; |
4090
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|
1952 init_cset_region_lengths(eden_region_length, survivor_region_length); |
6611 | 1953 |
1954 HeapRegion* hr = young_list->first_survivor_region(); | |
3867
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1955 while (hr != NULL) { |
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1956 assert(hr->is_survivor(), "badly formed young list"); |
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1957 hr->set_young(); |
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1958 hr = hr->get_next_young_region(); |
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1959 } |
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1960 |
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1961 // Clear the fields that point to the survivor list - they are all young now. |
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1962 young_list->clear_survivors(); |
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1963 |
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1964 _collection_set = _inc_cset_head; |
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1965 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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1966 time_remaining_ms = MAX2(time_remaining_ms - _inc_cset_predicted_elapsed_time_ms, 0.0); |
3867
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1967 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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1968 |
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1969 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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1970 "add young regions to CSet", |
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1971 ergo_format_region("eden") |
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1972 ergo_format_region("survivors") |
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1973 ergo_format_ms("predicted young region time"), |
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1974 eden_region_length, survivor_region_length, |
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1975 _inc_cset_predicted_elapsed_time_ms); |
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1976 |
3867
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1977 // The number of recorded young regions is the incremental |
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1978 // collection set's current size |
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1979 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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1980 |
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1981 double young_end_time_sec = os::elapsedTime(); |
6628
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1982 phase_times()->record_young_cset_choice_time_ms((young_end_time_sec - young_start_time_sec) * 1000.0); |
3867
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1983 |
6611 | 1984 // Set the start of the non-young choice time. |
1985 double non_young_start_time_sec = young_end_time_sec; | |
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1986 |
4710 | 1987 if (!gcs_are_young()) { |
4912
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1988 CollectionSetChooser* cset_chooser = _collectionSetChooser; |
6011 | 1989 cset_chooser->verify(); |
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1990 const uint min_old_cset_length = calc_min_old_cset_length(); |
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1991 const uint max_old_cset_length = calc_max_old_cset_length(); |
6010
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|
1992 |
720b6a76dd9d
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1993 uint expensive_region_num = 0; |
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1994 bool check_time_remaining = adaptive_young_list_length(); |
6611 | 1995 |
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1996 HeapRegion* hr = cset_chooser->peek(); |
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1997 while (hr != NULL) { |
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1998 if (old_cset_region_length() >= max_old_cset_length) { |
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1999 // Added maximum number of old regions to the CSet. |
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2000 ergo_verbose2(ErgoCSetConstruction, |
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2001 "finish adding old regions to CSet", |
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2002 ergo_format_reason("old CSet region num reached max") |
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2003 ergo_format_region("old") |
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2004 ergo_format_region("max"), |
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|
2005 old_cset_region_length(), max_old_cset_length); |
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2006 break; |
342 | 2007 } |
3914
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|
2008 |
8681
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|
2009 |
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|
2010 // Stop adding regions if the remaining reclaimable space is |
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|
2011 // not above G1HeapWastePercent. |
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|
2012 size_t reclaimable_bytes = cset_chooser->remaining_reclaimable_bytes(); |
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2013 double reclaimable_perc = reclaimable_bytes_perc(reclaimable_bytes); |
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|
2014 double threshold = (double) G1HeapWastePercent; |
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|
2015 if (reclaimable_perc <= threshold) { |
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|
2016 // We've added enough old regions that the amount of uncollected |
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|
2017 // reclaimable space is at or below the waste threshold. Stop |
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|
2018 // adding old regions to the CSet. |
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|
2019 ergo_verbose5(ErgoCSetConstruction, |
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|
2020 "finish adding old regions to CSet", |
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|
2021 ergo_format_reason("reclaimable percentage not over threshold") |
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|
2022 ergo_format_region("old") |
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|
2023 ergo_format_region("max") |
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|
2024 ergo_format_byte_perc("reclaimable") |
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|
2025 ergo_format_perc("threshold"), |
27714220e50e
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|
2026 old_cset_region_length(), |
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changeset
|
2027 max_old_cset_length, |
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changeset
|
2028 reclaimable_bytes, |
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diff
changeset
|
2029 reclaimable_perc, threshold); |
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diff
changeset
|
2030 break; |
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changeset
|
2031 } |
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|
2032 |
6611 | 2033 double predicted_time_ms = predict_region_elapsed_time_ms(hr, gcs_are_young()); |
4912
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|
2034 if (check_time_remaining) { |
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|
2035 if (predicted_time_ms > time_remaining_ms) { |
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changeset
|
2036 // Too expensive for the current CSet. |
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changeset
|
2037 |
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|
2038 if (old_cset_region_length() >= min_old_cset_length) { |
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|
2039 // We have added the minimum number of old regions to the CSet, |
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|
2040 // we are done with this CSet. |
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changeset
|
2041 ergo_verbose4(ErgoCSetConstruction, |
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changeset
|
2042 "finish adding old regions to CSet", |
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|
2043 ergo_format_reason("predicted time is too high") |
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|
2044 ergo_format_ms("predicted time") |
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|
2045 ergo_format_ms("remaining time") |
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|
2046 ergo_format_region("old") |
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|
2047 ergo_format_region("min"), |
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|
2048 predicted_time_ms, time_remaining_ms, |
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|
2049 old_cset_region_length(), min_old_cset_length); |
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|
2050 break; |
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diff
changeset
|
2051 } |
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|
2052 |
a9647476d1a4
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|
2053 // We'll add it anyway given that we haven't reached the |
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|
2054 // minimum number of old regions. |
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changeset
|
2055 expensive_region_num += 1; |
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|
2056 } |
3914
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|
2057 } else { |
4912
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|
2058 if (old_cset_region_length() >= min_old_cset_length) { |
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|
2059 // In the non-auto-tuning case, we'll finish adding regions |
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|
2060 // to the CSet if we reach the minimum. |
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|
2061 ergo_verbose2(ErgoCSetConstruction, |
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changeset
|
2062 "finish adding old regions to CSet", |
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|
2063 ergo_format_reason("old CSet region num reached min") |
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changeset
|
2064 ergo_format_region("old") |
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|
2065 ergo_format_region("min"), |
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|
2066 old_cset_region_length(), min_old_cset_length); |
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|
2067 break; |
3914
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|
2068 } |
20213c8a3c40
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diff
changeset
|
2069 } |
4912
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|
2070 |
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|
2071 // We will add this region to the CSet. |
8681
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|
2072 time_remaining_ms = MAX2(time_remaining_ms - predicted_time_ms, 0.0); |
4912
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|
2073 predicted_pause_time_ms += predicted_time_ms; |
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|
2074 cset_chooser->remove_and_move_to_next(hr); |
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|
2075 _g1->old_set_remove(hr); |
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changeset
|
2076 add_old_region_to_cset(hr); |
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changeset
|
2077 |
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changeset
|
2078 hr = cset_chooser->peek(); |
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changeset
|
2079 } |
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changeset
|
2080 if (hr == NULL) { |
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changeset
|
2081 ergo_verbose0(ErgoCSetConstruction, |
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changeset
|
2082 "finish adding old regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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4837
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|
2083 ergo_format_reason("candidate old regions not available")); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3868
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|
2084 } |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3868
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|
2085 |
4912
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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|
2086 if (expensive_region_num > 0) { |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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4837
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|
2087 // We print the information once here at the end, predicated on |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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|
2088 // whether we added any apparently expensive regions or not, to |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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|
2089 // avoid generating output per region. |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
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|
2090 ergo_verbose4(ErgoCSetConstruction, |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
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|
2091 "added expensive regions to CSet", |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
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|
2092 ergo_format_reason("old CSet region num not reached min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
4837
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|
2093 ergo_format_region("old") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
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|
2094 ergo_format_region("expensive") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
4837
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changeset
|
2095 ergo_format_region("min") |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
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|
2096 ergo_format_ms("remaining time"), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
tonyp
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|
2097 old_cset_region_length(), |
a9647476d1a4
7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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|
2098 expensive_region_num, |
a9647476d1a4
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tonyp
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|
2099 min_old_cset_length, |
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parents:
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|
2100 time_remaining_ms); |
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7132029: G1: mixed GC phase lasts for longer than it should
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|
2101 } |
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|
2102 |
6011 | 2103 cset_chooser->verify(); |
342 | 2104 } |
2105 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2106 stop_incremental_cset_building(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
2107 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2108 ergo_verbose5(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2109 "finish choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2110 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2111 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
2112 ergo_format_region("old") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2113 ergo_format_ms("predicted pause time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2114 ergo_format_ms("target pause time"), |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
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|
2115 eden_region_length, survivor_region_length, |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
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4072
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|
2116 old_cset_region_length(), |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2117 predicted_pause_time_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2118 |
342 | 2119 double non_young_end_time_sec = os::elapsedTime(); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2120 phase_times()->record_non_young_cset_choice_time_ms((non_young_end_time_sec - non_young_start_time_sec) * 1000.0); |
10405 | 2121 evacuation_info.set_collectionset_regions(cset_region_length()); |
342 | 2122 } |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2123 |
bbc900c2482a
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|
2124 void TraceGen0TimeData::record_start_collection(double time_to_stop_the_world_ms) { |
bbc900c2482a
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|
2125 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2126 _all_stop_world_times_ms.add(time_to_stop_the_world_ms); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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|
2127 } |
bbc900c2482a
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brutisso
parents:
6064
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|
2128 } |
bbc900c2482a
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brutisso
parents:
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|
2129 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2130 void TraceGen0TimeData::record_yield_time(double yield_time_ms) { |
bbc900c2482a
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|
2131 if(TraceGen0Time) { |
bbc900c2482a
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|
2132 _all_yield_times_ms.add(yield_time_ms); |
bbc900c2482a
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brutisso
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|
2133 } |
bbc900c2482a
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brutisso
parents:
6064
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changeset
|
2134 } |
bbc900c2482a
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brutisso
parents:
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|
2135 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
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|
2136 void TraceGen0TimeData::record_end_collection(double pause_time_ms, G1GCPhaseTimes* phase_times) { |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
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|
2137 if(TraceGen0Time) { |
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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|
2138 _total.add(pause_time_ms); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
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6109
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|
2139 _other.add(pause_time_ms - phase_times->accounted_time_ms()); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2140 _root_region_scan_wait.add(phase_times->root_region_scan_wait_time_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2141 _parallel.add(phase_times->cur_collection_par_time_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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|
2142 _ext_root_scan.add(phase_times->average_last_ext_root_scan_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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6611
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|
2143 _satb_filtering.add(phase_times->average_last_satb_filtering_times_ms()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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6611
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|
2144 _update_rs.add(phase_times->average_last_update_rs_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
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6611
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|
2145 _scan_rs.add(phase_times->average_last_scan_rs_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2146 _obj_copy.add(phase_times->average_last_obj_copy_time()); |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2147 _termination.add(phase_times->average_last_termination_time()); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2148 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2149 double parallel_known_time = phase_times->average_last_ext_root_scan_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2150 phase_times->average_last_satb_filtering_times_ms() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2151 phase_times->average_last_update_rs_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2152 phase_times->average_last_scan_rs_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2153 phase_times->average_last_obj_copy_time() + |
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2154 + phase_times->average_last_termination_time(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2155 |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2156 double parallel_other_time = phase_times->cur_collection_par_time_ms() - parallel_known_time; |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2157 _parallel_other.add(parallel_other_time); |
6628
bb3f6194fedb
7178363: G1: Remove the serial code for PrintGCDetails and make it a special case of the parallel code
brutisso
parents:
6611
diff
changeset
|
2158 _clear_ct.add(phase_times->cur_clear_ct_time_ms()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2159 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2160 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2161 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2162 void TraceGen0TimeData::increment_young_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2163 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2164 ++_young_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2165 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2166 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2167 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2168 void TraceGen0TimeData::increment_mixed_collection_count() { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2169 if(TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2170 ++_mixed_pause_num; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2171 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2172 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2173 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2174 void TraceGen0TimeData::print_summary(const char* str, |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2175 const NumberSeq* seq) const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2176 double sum = seq->sum(); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2177 gclog_or_tty->print_cr("%-27s = %8.2lf s (avg = %8.2lf ms)", |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2178 str, sum / 1000.0, seq->avg()); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2179 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2180 |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2181 void TraceGen0TimeData::print_summary_sd(const char* str, |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
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6064
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|
2182 const NumberSeq* seq) const { |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2183 print_summary(str, seq); |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2184 gclog_or_tty->print_cr("%+45s = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2185 "(num", seq->num(), seq->sd(), seq->maximum()); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2186 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2187 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2188 void TraceGen0TimeData::print() const { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2189 if (!TraceGen0Time) { |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2190 return; |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2191 } |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2192 |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2193 gclog_or_tty->print_cr("ALL PAUSES"); |
6219
922993931b3d
7178361: G1: Make sure that PrintGC and PrintGCDetails use the same timing for the GC pause
brutisso
parents:
6109
diff
changeset
|
2194 print_summary_sd(" Total", &_total); |
6109
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2195 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2196 gclog_or_tty->print_cr(""); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2197 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
bbc900c2482a
7172279: G1: Clean up TraceGen0Time and TraceGen1Time data gathering
brutisso
parents:
6064
diff
changeset
|
2198 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); |
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2199 gclog_or_tty->print_cr(""); |
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2200 |
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2201 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
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2202 |
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2203 if (_young_pause_num == 0 && _mixed_pause_num == 0) { |
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2204 gclog_or_tty->print_cr("none"); |
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2205 } else { |
6219
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2206 print_summary_sd(" Evacuation Pauses", &_total); |
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2207 print_summary(" Root Region Scan Wait", &_root_region_scan_wait); |
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2208 print_summary(" Parallel Time", &_parallel); |
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2209 print_summary(" Ext Root Scanning", &_ext_root_scan); |
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2210 print_summary(" SATB Filtering", &_satb_filtering); |
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2211 print_summary(" Update RS", &_update_rs); |
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2212 print_summary(" Scan RS", &_scan_rs); |
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2213 print_summary(" Object Copy", &_obj_copy); |
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2214 print_summary(" Termination", &_termination); |
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2215 print_summary(" Parallel Other", &_parallel_other); |
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2216 print_summary(" Clear CT", &_clear_ct); |
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2217 print_summary(" Other", &_other); |
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2218 } |
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2219 gclog_or_tty->print_cr(""); |
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2220 |
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2221 gclog_or_tty->print_cr("MISC"); |
6219
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2222 print_summary_sd(" Stop World", &_all_stop_world_times_ms); |
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2223 print_summary_sd(" Yields", &_all_yield_times_ms); |
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2224 } |
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2225 |
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2226 void TraceGen1TimeData::record_full_collection(double full_gc_time_ms) { |
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2227 if (TraceGen1Time) { |
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2228 _all_full_gc_times.add(full_gc_time_ms); |
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2229 } |
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2230 } |
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2231 |
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2232 void TraceGen1TimeData::print() const { |
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2233 if (!TraceGen1Time) { |
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2234 return; |
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2235 } |
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2236 |
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2237 if (_all_full_gc_times.num() > 0) { |
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2238 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
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2239 _all_full_gc_times.num(), |
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2240 _all_full_gc_times.sum() / 1000.0); |
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2241 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times.avg()); |
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2242 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", |
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2243 _all_full_gc_times.sd(), |
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2244 _all_full_gc_times.maximum()); |
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2245 } |
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2246 } |