Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp @ 4836:d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
Summary: Remove the separate counting phase of concurrent marking by tracking the amount of marked bytes and the cards spanned by marked objects in marking task/worker thread local data structures, which are updated as individual objects are marked.
Reviewed-by: brutisso, tonyp
author | johnc |
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date | Thu, 12 Jan 2012 00:06:47 -0800 |
parents | bca17e38de00 |
children | 22b8d3d181d9 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" | |
27 #include "gc_interface/gcCause.hpp" | |
28 #include "memory/collectorPolicy.hpp" | |
29 #include "runtime/timer.hpp" | |
30 #include "utilities/ostream.hpp" | |
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31 #include "utilities/workgroup.hpp" |
0 | 32 elapsedTimer AdaptiveSizePolicy::_minor_timer; |
33 elapsedTimer AdaptiveSizePolicy::_major_timer; | |
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34 bool AdaptiveSizePolicy::_debug_perturbation = false; |
0 | 35 |
36 // The throughput goal is implemented as | |
37 // _throughput_goal = 1 - ( 1 / (1 + gc_cost_ratio)) | |
38 // gc_cost_ratio is the ratio | |
39 // application cost / gc cost | |
40 // For example a gc_cost_ratio of 4 translates into a | |
41 // throughput goal of .80 | |
42 | |
43 AdaptiveSizePolicy::AdaptiveSizePolicy(size_t init_eden_size, | |
44 size_t init_promo_size, | |
45 size_t init_survivor_size, | |
46 double gc_pause_goal_sec, | |
47 uint gc_cost_ratio) : | |
48 _eden_size(init_eden_size), | |
49 _promo_size(init_promo_size), | |
50 _survivor_size(init_survivor_size), | |
51 _gc_pause_goal_sec(gc_pause_goal_sec), | |
52 _throughput_goal(1.0 - double(1.0 / (1.0 + (double) gc_cost_ratio))), | |
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53 _gc_overhead_limit_exceeded(false), |
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54 _print_gc_overhead_limit_would_be_exceeded(false), |
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55 _gc_overhead_limit_count(0), |
0 | 56 _latest_minor_mutator_interval_seconds(0), |
57 _threshold_tolerance_percent(1.0 + ThresholdTolerance/100.0), | |
58 _young_gen_change_for_minor_throughput(0), | |
59 _old_gen_change_for_major_throughput(0) { | |
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60 assert(AdaptiveSizePolicyGCTimeLimitThreshold > 0, |
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61 "No opportunity to clear SoftReferences before GC overhead limit"); |
0 | 62 _avg_minor_pause = |
63 new AdaptivePaddedAverage(AdaptiveTimeWeight, PausePadding); | |
64 _avg_minor_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
65 _avg_minor_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
66 _avg_major_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight); | |
67 | |
68 _avg_young_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); | |
69 _avg_old_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); | |
70 _avg_eden_live = new AdaptiveWeightedAverage(AdaptiveSizePolicyWeight); | |
71 | |
72 _avg_survived = new AdaptivePaddedAverage(AdaptiveSizePolicyWeight, | |
73 SurvivorPadding); | |
74 _avg_pretenured = new AdaptivePaddedNoZeroDevAverage( | |
75 AdaptiveSizePolicyWeight, | |
76 SurvivorPadding); | |
77 | |
78 _minor_pause_old_estimator = | |
79 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
80 _minor_pause_young_estimator = | |
81 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
82 _minor_collection_estimator = | |
83 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
84 _major_collection_estimator = | |
85 new LinearLeastSquareFit(AdaptiveSizePolicyWeight); | |
86 | |
87 // Start the timers | |
88 _minor_timer.start(); | |
89 | |
90 _young_gen_policy_is_ready = false; | |
91 } | |
92 | |
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93 // If the number of GC threads was set on the command line, |
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94 // use it. |
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95 // Else |
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96 // Calculate the number of GC threads based on the number of Java threads. |
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97 // Calculate the number of GC threads based on the size of the heap. |
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98 // Use the larger. |
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99 |
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100 int AdaptiveSizePolicy::calc_default_active_workers(uintx total_workers, |
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101 const uintx min_workers, |
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102 uintx active_workers, |
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103 uintx application_workers) { |
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104 // If the user has specifically set the number of |
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105 // GC threads, use them. |
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106 |
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107 // If the user has turned off using a dynamic number of GC threads |
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108 // or the users has requested a specific number, set the active |
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109 // number of workers to all the workers. |
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110 |
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111 uintx new_active_workers = total_workers; |
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112 uintx prev_active_workers = active_workers; |
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113 uintx active_workers_by_JT = 0; |
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114 uintx active_workers_by_heap_size = 0; |
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115 |
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116 // Always use at least min_workers but use up to |
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117 // GCThreadsPerJavaThreads * application threads. |
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118 active_workers_by_JT = |
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119 MAX2((uintx) GCWorkersPerJavaThread * application_workers, |
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120 min_workers); |
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121 |
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122 // Choose a number of GC threads based on the current size |
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123 // of the heap. This may be complicated because the size of |
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124 // the heap depends on factors such as the thoughput goal. |
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125 // Still a large heap should be collected by more GC threads. |
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126 active_workers_by_heap_size = |
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127 MAX2((size_t) 2U, Universe::heap()->capacity() / HeapSizePerGCThread); |
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128 |
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129 uintx max_active_workers = |
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130 MAX2(active_workers_by_JT, active_workers_by_heap_size); |
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131 |
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132 // Limit the number of workers to the the number created, |
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133 // (workers()). |
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134 new_active_workers = MIN2(max_active_workers, |
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135 (uintx) total_workers); |
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136 |
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137 // Increase GC workers instantly but decrease them more |
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138 // slowly. |
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139 if (new_active_workers < prev_active_workers) { |
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140 new_active_workers = |
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141 MAX2(min_workers, (prev_active_workers + new_active_workers) / 2); |
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142 } |
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143 |
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144 // Check once more that the number of workers is within the limits. |
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145 assert(min_workers <= total_workers, "Minimum workers not consistent with total workers"); |
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146 assert(new_active_workers >= min_workers, "Minimum workers not observed"); |
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147 assert(new_active_workers <= total_workers, "Total workers not observed"); |
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148 |
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149 if (ForceDynamicNumberOfGCThreads) { |
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150 // Assume this is debugging and jiggle the number of GC threads. |
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151 if (new_active_workers == prev_active_workers) { |
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152 if (new_active_workers < total_workers) { |
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153 new_active_workers++; |
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154 } else if (new_active_workers > min_workers) { |
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155 new_active_workers--; |
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156 } |
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157 } |
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158 if (new_active_workers == total_workers) { |
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159 if (_debug_perturbation) { |
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160 new_active_workers = min_workers; |
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161 } |
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162 _debug_perturbation = !_debug_perturbation; |
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163 } |
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164 assert((new_active_workers <= (uintx) ParallelGCThreads) && |
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165 (new_active_workers >= min_workers), |
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166 "Jiggled active workers too much"); |
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167 } |
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168 |
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169 if (TraceDynamicGCThreads) { |
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170 gclog_or_tty->print_cr("GCTaskManager::calc_default_active_workers() : " |
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171 "active_workers(): %d new_acitve_workers: %d " |
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172 "prev_active_workers: %d\n" |
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173 " active_workers_by_JT: %d active_workers_by_heap_size: %d", |
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174 active_workers, new_active_workers, prev_active_workers, |
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175 active_workers_by_JT, active_workers_by_heap_size); |
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176 } |
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177 assert(new_active_workers > 0, "Always need at least 1"); |
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178 return new_active_workers; |
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179 } |
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180 |
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181 int AdaptiveSizePolicy::calc_active_workers(uintx total_workers, |
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182 uintx active_workers, |
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183 uintx application_workers) { |
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184 // If the user has specifically set the number of |
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185 // GC threads, use them. |
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186 |
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187 // If the user has turned off using a dynamic number of GC threads |
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188 // or the users has requested a specific number, set the active |
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189 // number of workers to all the workers. |
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190 |
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191 int new_active_workers; |
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192 if (!UseDynamicNumberOfGCThreads || |
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193 (!FLAG_IS_DEFAULT(ParallelGCThreads) && !ForceDynamicNumberOfGCThreads)) { |
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194 new_active_workers = total_workers; |
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195 } else { |
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196 new_active_workers = calc_default_active_workers(total_workers, |
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197 2, /* Minimum number of workers */ |
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198 active_workers, |
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199 application_workers); |
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200 } |
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201 assert(new_active_workers > 0, "Always need at least 1"); |
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202 return new_active_workers; |
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203 } |
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204 |
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205 int AdaptiveSizePolicy::calc_active_conc_workers(uintx total_workers, |
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206 uintx active_workers, |
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207 uintx application_workers) { |
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208 if (!UseDynamicNumberOfGCThreads || |
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209 (!FLAG_IS_DEFAULT(ConcGCThreads) && !ForceDynamicNumberOfGCThreads)) { |
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210 return ConcGCThreads; |
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211 } else { |
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212 int no_of_gc_threads = calc_default_active_workers( |
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213 total_workers, |
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214 1, /* Minimum number of workers */ |
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215 active_workers, |
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216 application_workers); |
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217 return no_of_gc_threads; |
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218 } |
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219 } |
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220 |
0 | 221 bool AdaptiveSizePolicy::tenuring_threshold_change() const { |
222 return decrement_tenuring_threshold_for_gc_cost() || | |
223 increment_tenuring_threshold_for_gc_cost() || | |
224 decrement_tenuring_threshold_for_survivor_limit(); | |
225 } | |
226 | |
227 void AdaptiveSizePolicy::minor_collection_begin() { | |
228 // Update the interval time | |
229 _minor_timer.stop(); | |
230 // Save most recent collection time | |
231 _latest_minor_mutator_interval_seconds = _minor_timer.seconds(); | |
232 _minor_timer.reset(); | |
233 _minor_timer.start(); | |
234 } | |
235 | |
236 void AdaptiveSizePolicy::update_minor_pause_young_estimator( | |
237 double minor_pause_in_ms) { | |
238 double eden_size_in_mbytes = ((double)_eden_size)/((double)M); | |
239 _minor_pause_young_estimator->update(eden_size_in_mbytes, | |
240 minor_pause_in_ms); | |
241 } | |
242 | |
243 void AdaptiveSizePolicy::minor_collection_end(GCCause::Cause gc_cause) { | |
244 // Update the pause time. | |
245 _minor_timer.stop(); | |
246 | |
247 if (gc_cause != GCCause::_java_lang_system_gc || | |
248 UseAdaptiveSizePolicyWithSystemGC) { | |
249 double minor_pause_in_seconds = _minor_timer.seconds(); | |
250 double minor_pause_in_ms = minor_pause_in_seconds * MILLIUNITS; | |
251 | |
252 // Sample for performance counter | |
253 _avg_minor_pause->sample(minor_pause_in_seconds); | |
254 | |
255 // Cost of collection (unit-less) | |
256 double collection_cost = 0.0; | |
257 if ((_latest_minor_mutator_interval_seconds > 0.0) && | |
258 (minor_pause_in_seconds > 0.0)) { | |
259 double interval_in_seconds = | |
260 _latest_minor_mutator_interval_seconds + minor_pause_in_seconds; | |
261 collection_cost = | |
262 minor_pause_in_seconds / interval_in_seconds; | |
263 _avg_minor_gc_cost->sample(collection_cost); | |
264 // Sample for performance counter | |
265 _avg_minor_interval->sample(interval_in_seconds); | |
266 } | |
267 | |
268 // The policy does not have enough data until at least some | |
269 // minor collections have been done. | |
270 _young_gen_policy_is_ready = | |
271 (_avg_minor_gc_cost->count() >= AdaptiveSizePolicyReadyThreshold); | |
272 | |
273 // Calculate variables used to estimate pause time vs. gen sizes | |
274 double eden_size_in_mbytes = ((double)_eden_size)/((double)M); | |
275 update_minor_pause_young_estimator(minor_pause_in_ms); | |
276 update_minor_pause_old_estimator(minor_pause_in_ms); | |
277 | |
278 if (PrintAdaptiveSizePolicy && Verbose) { | |
279 gclog_or_tty->print("AdaptiveSizePolicy::minor_collection_end: " | |
280 "minor gc cost: %f average: %f", collection_cost, | |
281 _avg_minor_gc_cost->average()); | |
282 gclog_or_tty->print_cr(" minor pause: %f minor period %f", | |
283 minor_pause_in_ms, | |
284 _latest_minor_mutator_interval_seconds * MILLIUNITS); | |
285 } | |
286 | |
287 // Calculate variable used to estimate collection cost vs. gen sizes | |
288 assert(collection_cost >= 0.0, "Expected to be non-negative"); | |
289 _minor_collection_estimator->update(eden_size_in_mbytes, collection_cost); | |
290 } | |
291 | |
292 // Interval times use this timer to measure the mutator time. | |
293 // Reset the timer after the GC pause. | |
294 _minor_timer.reset(); | |
295 _minor_timer.start(); | |
296 } | |
297 | |
298 size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden, | |
299 uint percent_change) { | |
300 size_t eden_heap_delta; | |
301 eden_heap_delta = cur_eden / 100 * percent_change; | |
302 return eden_heap_delta; | |
303 } | |
304 | |
305 size_t AdaptiveSizePolicy::eden_increment(size_t cur_eden) { | |
306 return eden_increment(cur_eden, YoungGenerationSizeIncrement); | |
307 } | |
308 | |
309 size_t AdaptiveSizePolicy::eden_decrement(size_t cur_eden) { | |
310 size_t eden_heap_delta = eden_increment(cur_eden) / | |
311 AdaptiveSizeDecrementScaleFactor; | |
312 return eden_heap_delta; | |
313 } | |
314 | |
315 size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo, | |
316 uint percent_change) { | |
317 size_t promo_heap_delta; | |
318 promo_heap_delta = cur_promo / 100 * percent_change; | |
319 return promo_heap_delta; | |
320 } | |
321 | |
322 size_t AdaptiveSizePolicy::promo_increment(size_t cur_promo) { | |
323 return promo_increment(cur_promo, TenuredGenerationSizeIncrement); | |
324 } | |
325 | |
326 size_t AdaptiveSizePolicy::promo_decrement(size_t cur_promo) { | |
327 size_t promo_heap_delta = promo_increment(cur_promo); | |
328 promo_heap_delta = promo_heap_delta / AdaptiveSizeDecrementScaleFactor; | |
329 return promo_heap_delta; | |
330 } | |
331 | |
332 double AdaptiveSizePolicy::time_since_major_gc() const { | |
333 _major_timer.stop(); | |
334 double result = _major_timer.seconds(); | |
335 _major_timer.start(); | |
336 return result; | |
337 } | |
338 | |
339 // Linear decay of major gc cost | |
340 double AdaptiveSizePolicy::decaying_major_gc_cost() const { | |
341 double major_interval = major_gc_interval_average_for_decay(); | |
342 double major_gc_cost_average = major_gc_cost(); | |
343 double decayed_major_gc_cost = major_gc_cost_average; | |
344 if(time_since_major_gc() > 0.0) { | |
345 decayed_major_gc_cost = major_gc_cost() * | |
346 (((double) AdaptiveSizeMajorGCDecayTimeScale) * major_interval) | |
347 / time_since_major_gc(); | |
348 } | |
349 | |
350 // The decayed cost should always be smaller than the | |
351 // average cost but the vagaries of finite arithmetic could | |
352 // produce a larger value in decayed_major_gc_cost so protect | |
353 // against that. | |
354 return MIN2(major_gc_cost_average, decayed_major_gc_cost); | |
355 } | |
356 | |
357 // Use a value of the major gc cost that has been decayed | |
358 // by the factor | |
359 // | |
360 // average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale / | |
361 // time-since-last-major-gc | |
362 // | |
363 // if the average-interval-between-major-gc * AdaptiveSizeMajorGCDecayTimeScale | |
364 // is less than time-since-last-major-gc. | |
365 // | |
366 // In cases where there are initial major gc's that | |
367 // are of a relatively high cost but no later major | |
368 // gc's, the total gc cost can remain high because | |
369 // the major gc cost remains unchanged (since there are no major | |
370 // gc's). In such a situation the value of the unchanging | |
371 // major gc cost can keep the mutator throughput below | |
372 // the goal when in fact the major gc cost is becoming diminishingly | |
373 // small. Use the decaying gc cost only to decide whether to | |
374 // adjust for throughput. Using it also to determine the adjustment | |
375 // to be made for throughput also seems reasonable but there is | |
376 // no test case to use to decide if it is the right thing to do | |
377 // don't do it yet. | |
378 | |
379 double AdaptiveSizePolicy::decaying_gc_cost() const { | |
380 double decayed_major_gc_cost = major_gc_cost(); | |
381 double avg_major_interval = major_gc_interval_average_for_decay(); | |
382 if (UseAdaptiveSizeDecayMajorGCCost && | |
383 (AdaptiveSizeMajorGCDecayTimeScale > 0) && | |
384 (avg_major_interval > 0.00)) { | |
385 double time_since_last_major_gc = time_since_major_gc(); | |
386 | |
387 // Decay the major gc cost? | |
388 if (time_since_last_major_gc > | |
389 ((double) AdaptiveSizeMajorGCDecayTimeScale) * avg_major_interval) { | |
390 | |
391 // Decay using the time-since-last-major-gc | |
392 decayed_major_gc_cost = decaying_major_gc_cost(); | |
393 if (PrintGCDetails && Verbose) { | |
394 gclog_or_tty->print_cr("\ndecaying_gc_cost: major interval average:" | |
395 " %f time since last major gc: %f", | |
396 avg_major_interval, time_since_last_major_gc); | |
397 gclog_or_tty->print_cr(" major gc cost: %f decayed major gc cost: %f", | |
398 major_gc_cost(), decayed_major_gc_cost); | |
399 } | |
400 } | |
401 } | |
402 double result = MIN2(1.0, decayed_major_gc_cost + minor_gc_cost()); | |
403 return result; | |
404 } | |
405 | |
406 | |
407 void AdaptiveSizePolicy::clear_generation_free_space_flags() { | |
408 set_change_young_gen_for_min_pauses(0); | |
409 set_change_old_gen_for_maj_pauses(0); | |
410 | |
411 set_change_old_gen_for_throughput(0); | |
412 set_change_young_gen_for_throughput(0); | |
413 set_decrease_for_footprint(0); | |
414 set_decide_at_full_gc(0); | |
415 } | |
416 | |
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417 void AdaptiveSizePolicy::check_gc_overhead_limit( |
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418 size_t young_live, |
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419 size_t eden_live, |
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420 size_t max_old_gen_size, |
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421 size_t max_eden_size, |
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422 bool is_full_gc, |
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423 GCCause::Cause gc_cause, |
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424 CollectorPolicy* collector_policy) { |
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425 |
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426 // Ignore explicit GC's. Exiting here does not set the flag and |
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427 // does not reset the count. Updating of the averages for system |
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428 // GC's is still controlled by UseAdaptiveSizePolicyWithSystemGC. |
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429 if (GCCause::is_user_requested_gc(gc_cause) || |
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430 GCCause::is_serviceability_requested_gc(gc_cause)) { |
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431 return; |
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432 } |
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433 // eden_limit is the upper limit on the size of eden based on |
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434 // the maximum size of the young generation and the sizes |
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435 // of the survivor space. |
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436 // The question being asked is whether the gc costs are high |
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437 // and the space being recovered by a collection is low. |
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438 // free_in_young_gen is the free space in the young generation |
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439 // after a collection and promo_live is the free space in the old |
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440 // generation after a collection. |
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441 // |
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442 // Use the minimum of the current value of the live in the |
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443 // young gen or the average of the live in the young gen. |
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444 // If the current value drops quickly, that should be taken |
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445 // into account (i.e., don't trigger if the amount of free |
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446 // space has suddenly jumped up). If the current is much |
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447 // higher than the average, use the average since it represents |
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448 // the longer term behavor. |
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449 const size_t live_in_eden = |
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450 MIN2(eden_live, (size_t) avg_eden_live()->average()); |
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451 const size_t free_in_eden = max_eden_size > live_in_eden ? |
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452 max_eden_size - live_in_eden : 0; |
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453 const size_t free_in_old_gen = (size_t)(max_old_gen_size - avg_old_live()->average()); |
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454 const size_t total_free_limit = free_in_old_gen + free_in_eden; |
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455 const size_t total_mem = max_old_gen_size + max_eden_size; |
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456 const double mem_free_limit = total_mem * (GCHeapFreeLimit/100.0); |
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457 const double mem_free_old_limit = max_old_gen_size * (GCHeapFreeLimit/100.0); |
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458 const double mem_free_eden_limit = max_eden_size * (GCHeapFreeLimit/100.0); |
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459 const double gc_cost_limit = GCTimeLimit/100.0; |
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460 size_t promo_limit = (size_t)(max_old_gen_size - avg_old_live()->average()); |
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461 // But don't force a promo size below the current promo size. Otherwise, |
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462 // the promo size will shrink for no good reason. |
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463 promo_limit = MAX2(promo_limit, _promo_size); |
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464 |
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465 |
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466 if (PrintAdaptiveSizePolicy && (Verbose || |
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467 (free_in_old_gen < (size_t) mem_free_old_limit && |
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468 free_in_eden < (size_t) mem_free_eden_limit))) { |
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469 gclog_or_tty->print_cr( |
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470 "PSAdaptiveSizePolicy::compute_generation_free_space limits:" |
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471 " promo_limit: " SIZE_FORMAT |
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472 " max_eden_size: " SIZE_FORMAT |
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473 " total_free_limit: " SIZE_FORMAT |
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474 " max_old_gen_size: " SIZE_FORMAT |
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475 " max_eden_size: " SIZE_FORMAT |
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476 " mem_free_limit: " SIZE_FORMAT, |
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477 promo_limit, max_eden_size, total_free_limit, |
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478 max_old_gen_size, max_eden_size, |
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479 (size_t) mem_free_limit); |
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480 } |
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481 |
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482 bool print_gc_overhead_limit_would_be_exceeded = false; |
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483 if (is_full_gc) { |
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484 if (gc_cost() > gc_cost_limit && |
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485 free_in_old_gen < (size_t) mem_free_old_limit && |
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486 free_in_eden < (size_t) mem_free_eden_limit) { |
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487 // Collections, on average, are taking too much time, and |
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488 // gc_cost() > gc_cost_limit |
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489 // we have too little space available after a full gc. |
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490 // total_free_limit < mem_free_limit |
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491 // where |
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492 // total_free_limit is the free space available in |
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493 // both generations |
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494 // total_mem is the total space available for allocation |
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495 // in both generations (survivor spaces are not included |
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496 // just as they are not included in eden_limit). |
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497 // mem_free_limit is a fraction of total_mem judged to be an |
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498 // acceptable amount that is still unused. |
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499 // The heap can ask for the value of this variable when deciding |
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500 // whether to thrown an OutOfMemory error. |
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501 // Note that the gc time limit test only works for the collections |
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502 // of the young gen + tenured gen and not for collections of the |
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503 // permanent gen. That is because the calculation of the space |
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504 // freed by the collection is the free space in the young gen + |
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505 // tenured gen. |
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506 // At this point the GC overhead limit is being exceeded. |
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507 inc_gc_overhead_limit_count(); |
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508 if (UseGCOverheadLimit) { |
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509 if (gc_overhead_limit_count() >= |
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510 AdaptiveSizePolicyGCTimeLimitThreshold){ |
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511 // All conditions have been met for throwing an out-of-memory |
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512 set_gc_overhead_limit_exceeded(true); |
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513 // Avoid consecutive OOM due to the gc time limit by resetting |
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514 // the counter. |
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515 reset_gc_overhead_limit_count(); |
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516 } else { |
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517 // The required consecutive collections which exceed the |
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518 // GC time limit may or may not have been reached. We |
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519 // are approaching that condition and so as not to |
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520 // throw an out-of-memory before all SoftRef's have been |
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521 // cleared, set _should_clear_all_soft_refs in CollectorPolicy. |
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522 // The clearing will be done on the next GC. |
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523 bool near_limit = gc_overhead_limit_near(); |
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524 if (near_limit) { |
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525 collector_policy->set_should_clear_all_soft_refs(true); |
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526 if (PrintGCDetails && Verbose) { |
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527 gclog_or_tty->print_cr(" Nearing GC overhead limit, " |
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528 "will be clearing all SoftReference"); |
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529 } |
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530 } |
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531 } |
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532 } |
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533 // Set this even when the overhead limit will not |
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534 // cause an out-of-memory. Diagnostic message indicating |
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535 // that the overhead limit is being exceeded is sometimes |
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536 // printed. |
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537 print_gc_overhead_limit_would_be_exceeded = true; |
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538 |
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539 } else { |
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540 // Did not exceed overhead limits |
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541 reset_gc_overhead_limit_count(); |
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542 } |
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543 } |
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544 |
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545 if (UseGCOverheadLimit && PrintGCDetails && Verbose) { |
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546 if (gc_overhead_limit_exceeded()) { |
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547 gclog_or_tty->print_cr(" GC is exceeding overhead limit " |
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548 "of %d%%", GCTimeLimit); |
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549 reset_gc_overhead_limit_count(); |
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550 } else if (print_gc_overhead_limit_would_be_exceeded) { |
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551 assert(gc_overhead_limit_count() > 0, "Should not be printing"); |
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552 gclog_or_tty->print_cr(" GC would exceed overhead limit " |
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553 "of %d%% %d consecutive time(s)", |
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554 GCTimeLimit, gc_overhead_limit_count()); |
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555 } |
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556 } |
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557 } |
0 | 558 // Printing |
559 | |
560 bool AdaptiveSizePolicy::print_adaptive_size_policy_on(outputStream* st) const { | |
561 | |
562 // Should only be used with adaptive size policy turned on. | |
563 // Otherwise, there may be variables that are undefined. | |
564 if (!UseAdaptiveSizePolicy) return false; | |
565 | |
566 // Print goal for which action is needed. | |
567 char* action = NULL; | |
568 bool change_for_pause = false; | |
569 if ((change_old_gen_for_maj_pauses() == | |
570 decrease_old_gen_for_maj_pauses_true) || | |
571 (change_young_gen_for_min_pauses() == | |
572 decrease_young_gen_for_min_pauses_true)) { | |
573 action = (char*) " *** pause time goal ***"; | |
574 change_for_pause = true; | |
575 } else if ((change_old_gen_for_throughput() == | |
576 increase_old_gen_for_throughput_true) || | |
577 (change_young_gen_for_throughput() == | |
578 increase_young_gen_for_througput_true)) { | |
579 action = (char*) " *** throughput goal ***"; | |
580 } else if (decrease_for_footprint()) { | |
581 action = (char*) " *** reduced footprint ***"; | |
582 } else { | |
583 // No actions were taken. This can legitimately be the | |
584 // situation if not enough data has been gathered to make | |
585 // decisions. | |
586 return false; | |
587 } | |
588 | |
589 // Pauses | |
590 // Currently the size of the old gen is only adjusted to | |
591 // change the major pause times. | |
592 char* young_gen_action = NULL; | |
593 char* tenured_gen_action = NULL; | |
594 | |
595 char* shrink_msg = (char*) "(attempted to shrink)"; | |
596 char* grow_msg = (char*) "(attempted to grow)"; | |
597 char* no_change_msg = (char*) "(no change)"; | |
598 if (change_young_gen_for_min_pauses() == | |
599 decrease_young_gen_for_min_pauses_true) { | |
600 young_gen_action = shrink_msg; | |
601 } else if (change_for_pause) { | |
602 young_gen_action = no_change_msg; | |
603 } | |
604 | |
605 if (change_old_gen_for_maj_pauses() == decrease_old_gen_for_maj_pauses_true) { | |
606 tenured_gen_action = shrink_msg; | |
607 } else if (change_for_pause) { | |
608 tenured_gen_action = no_change_msg; | |
609 } | |
610 | |
611 // Throughput | |
612 if (change_old_gen_for_throughput() == increase_old_gen_for_throughput_true) { | |
613 assert(change_young_gen_for_throughput() == | |
614 increase_young_gen_for_througput_true, | |
615 "Both generations should be growing"); | |
616 young_gen_action = grow_msg; | |
617 tenured_gen_action = grow_msg; | |
618 } else if (change_young_gen_for_throughput() == | |
619 increase_young_gen_for_througput_true) { | |
620 // Only the young generation may grow at start up (before | |
621 // enough full collections have been done to grow the old generation). | |
622 young_gen_action = grow_msg; | |
623 tenured_gen_action = no_change_msg; | |
624 } | |
625 | |
626 // Minimum footprint | |
627 if (decrease_for_footprint() != 0) { | |
628 young_gen_action = shrink_msg; | |
629 tenured_gen_action = shrink_msg; | |
630 } | |
631 | |
632 st->print_cr(" UseAdaptiveSizePolicy actions to meet %s", action); | |
633 st->print_cr(" GC overhead (%%)"); | |
634 st->print_cr(" Young generation: %7.2f\t %s", | |
635 100.0 * avg_minor_gc_cost()->average(), | |
636 young_gen_action); | |
637 st->print_cr(" Tenured generation: %7.2f\t %s", | |
638 100.0 * avg_major_gc_cost()->average(), | |
639 tenured_gen_action); | |
640 return true; | |
641 } | |
642 | |
643 bool AdaptiveSizePolicy::print_adaptive_size_policy_on( | |
644 outputStream* st, | |
645 int tenuring_threshold_arg) const { | |
646 if (!AdaptiveSizePolicy::print_adaptive_size_policy_on(st)) { | |
647 return false; | |
648 } | |
649 | |
650 // Tenuring threshold | |
651 bool tenuring_threshold_changed = true; | |
652 if (decrement_tenuring_threshold_for_survivor_limit()) { | |
653 st->print(" Tenuring threshold: (attempted to decrease to avoid" | |
654 " survivor space overflow) = "); | |
655 } else if (decrement_tenuring_threshold_for_gc_cost()) { | |
656 st->print(" Tenuring threshold: (attempted to decrease to balance" | |
657 " GC costs) = "); | |
658 } else if (increment_tenuring_threshold_for_gc_cost()) { | |
659 st->print(" Tenuring threshold: (attempted to increase to balance" | |
660 " GC costs) = "); | |
661 } else { | |
662 tenuring_threshold_changed = false; | |
663 assert(!tenuring_threshold_change(), "(no change was attempted)"); | |
664 } | |
665 if (tenuring_threshold_changed) { | |
666 st->print_cr("%d", tenuring_threshold_arg); | |
667 } | |
668 return true; | |
669 } |