Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 12873:4e7f99b70d9d
Merge
author | adlertz |
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date | Wed, 09 Oct 2013 05:03:34 -0700 |
parents | ab68fc0101ce |
children | 9b4d0569f2f4 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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_implementation/shared/gcPolicyCounters.hpp" | |
28 #include "gc_implementation/shared/vmGCOperations.hpp" | |
29 #include "memory/cardTableRS.hpp" | |
30 #include "memory/collectorPolicy.hpp" | |
31 #include "memory/gcLocker.inline.hpp" | |
32 #include "memory/genCollectedHeap.hpp" | |
33 #include "memory/generationSpec.hpp" | |
34 #include "memory/space.hpp" | |
35 #include "memory/universe.hpp" | |
36 #include "runtime/arguments.hpp" | |
37 #include "runtime/globals_extension.hpp" | |
38 #include "runtime/handles.inline.hpp" | |
39 #include "runtime/java.hpp" | |
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40 #include "runtime/thread.inline.hpp" |
1972 | 41 #include "runtime/vmThread.hpp" |
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42 #include "utilities/macros.hpp" |
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43 #if INCLUDE_ALL_GCS |
1972 | 44 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" |
45 #include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp" | |
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46 #endif // INCLUDE_ALL_GCS |
0 | 47 |
48 // CollectorPolicy methods. | |
49 | |
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50 // Align down. If the aligning result in 0, return 'alignment'. |
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51 static size_t restricted_align_down(size_t size, size_t alignment) { |
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52 return MAX2(alignment, align_size_down_(size, alignment)); |
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53 } |
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54 |
0 | 55 void CollectorPolicy::initialize_flags() { |
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56 assert(max_alignment() >= min_alignment(), |
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57 err_msg("max_alignment: " SIZE_FORMAT " less than min_alignment: " SIZE_FORMAT, |
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58 max_alignment(), min_alignment())); |
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59 assert(max_alignment() % min_alignment() == 0, |
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60 err_msg("max_alignment: " SIZE_FORMAT " not aligned by min_alignment: " SIZE_FORMAT, |
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61 max_alignment(), min_alignment())); |
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62 |
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63 if (MaxHeapSize < InitialHeapSize) { |
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64 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
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65 } |
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66 |
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67 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will |
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68 // override if MaxMetaspaceSize was set on the command line or not. |
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69 // This information is needed later to conform to the specification of the |
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70 // java.lang.management.MemoryUsage API. |
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71 // |
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72 // Ideally, we would be able to set the default value of MaxMetaspaceSize in |
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73 // globals.hpp to the aligned value, but this is not possible, since the |
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74 // alignment depends on other flags being parsed. |
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75 MaxMetaspaceSize = restricted_align_down(MaxMetaspaceSize, max_alignment()); |
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76 |
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77 if (MetaspaceSize > MaxMetaspaceSize) { |
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78 MetaspaceSize = MaxMetaspaceSize; |
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79 } |
0 | 80 |
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81 MetaspaceSize = restricted_align_down(MetaspaceSize, min_alignment()); |
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82 |
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83 assert(MetaspaceSize <= MaxMetaspaceSize, "Must be"); |
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84 |
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85 MinMetaspaceExpansion = restricted_align_down(MinMetaspaceExpansion, min_alignment()); |
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86 MaxMetaspaceExpansion = restricted_align_down(MaxMetaspaceExpansion, min_alignment()); |
0 | 87 |
88 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
89 | |
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90 assert(MetaspaceSize % min_alignment() == 0, "metapace alignment"); |
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91 assert(MaxMetaspaceSize % max_alignment() == 0, "maximum metaspace alignment"); |
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92 if (MetaspaceSize < 256*K) { |
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93 vm_exit_during_initialization("Too small initial Metaspace size"); |
0 | 94 } |
95 } | |
96 | |
97 void CollectorPolicy::initialize_size_info() { | |
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98 // User inputs from -mx and ms must be aligned |
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99 set_min_heap_byte_size(align_size_up(Arguments::min_heap_size(), min_alignment())); |
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100 set_initial_heap_byte_size(align_size_up(InitialHeapSize, min_alignment())); |
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101 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
0 | 102 |
103 // Check heap parameter properties | |
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104 if (initial_heap_byte_size() < M) { |
0 | 105 vm_exit_during_initialization("Too small initial heap"); |
106 } | |
107 // Check heap parameter properties | |
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108 if (min_heap_byte_size() < M) { |
0 | 109 vm_exit_during_initialization("Too small minimum heap"); |
110 } | |
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111 if (initial_heap_byte_size() <= NewSize) { |
0 | 112 // make sure there is at least some room in old space |
113 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
114 } | |
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115 if (max_heap_byte_size() < min_heap_byte_size()) { |
0 | 116 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
117 } | |
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118 if (initial_heap_byte_size() < min_heap_byte_size()) { |
0 | 119 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
120 } | |
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121 if (max_heap_byte_size() < initial_heap_byte_size()) { |
0 | 122 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
123 } | |
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124 |
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125 if (PrintGCDetails && Verbose) { |
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126 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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127 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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128 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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129 } |
0 | 130 } |
131 | |
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132 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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133 bool result = _should_clear_all_soft_refs; |
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134 set_should_clear_all_soft_refs(false); |
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135 return result; |
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136 } |
0 | 137 |
138 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
139 int max_covered_regions) { | |
12350 | 140 assert(rem_set_name() == GenRemSet::CardTable, "unrecognized GenRemSet::Name"); |
141 return new CardTableRS(whole_heap, max_covered_regions); | |
0 | 142 } |
143 | |
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144 void CollectorPolicy::cleared_all_soft_refs() { |
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145 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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146 // have been cleared in the last collection but if the gc overhear |
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147 // limit continues to be near, SoftRefs should still be cleared. |
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148 if (size_policy() != NULL) { |
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149 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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150 } |
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151 _all_soft_refs_clear = true; |
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152 } |
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153 |
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154 size_t CollectorPolicy::compute_max_alignment() { |
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155 // The card marking array and the offset arrays for old generations are |
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156 // committed in os pages as well. Make sure they are entirely full (to |
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157 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 |
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158 // byte entry and the os page size is 4096, the maximum heap size should |
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159 // be 512*4096 = 2MB aligned. |
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160 |
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161 // There is only the GenRemSet in Hotspot and only the GenRemSet::CardTable |
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162 // is supported. |
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163 // Requirements of any new remembered set implementations must be added here. |
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164 size_t alignment = GenRemSet::max_alignment_constraint(GenRemSet::CardTable); |
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165 |
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166 // Parallel GC does its own alignment of the generations to avoid requiring a |
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167 // large page (256M on some platforms) for the permanent generation. The |
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168 // other collectors should also be updated to do their own alignment and then |
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169 // this use of lcm() should be removed. |
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170 if (UseLargePages && !UseParallelGC) { |
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171 // in presence of large pages we have to make sure that our |
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172 // alignment is large page aware |
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173 alignment = lcm(os::large_page_size(), alignment); |
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174 } |
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175 |
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176 return alignment; |
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177 } |
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178 |
0 | 179 // GenCollectorPolicy methods. |
180 | |
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181 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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182 size_t x = base_size / (NewRatio+1); |
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183 size_t new_gen_size = x > min_alignment() ? |
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184 align_size_down(x, min_alignment()) : |
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185 min_alignment(); |
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186 return new_gen_size; |
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187 } |
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188 |
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189 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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190 size_t maximum_size) { |
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191 size_t alignment = min_alignment(); |
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192 size_t max_minus = maximum_size - alignment; |
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193 return desired_size < max_minus ? desired_size : max_minus; |
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194 } |
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195 |
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196 |
0 | 197 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
198 size_t init_promo_size, | |
199 size_t init_survivor_size) { | |
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200 const double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; |
0 | 201 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
202 init_promo_size, | |
203 init_survivor_size, | |
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204 max_gc_pause_sec, |
0 | 205 GCTimeRatio); |
206 } | |
207 | |
208 void GenCollectorPolicy::initialize_flags() { | |
209 // All sizes must be multiples of the generation granularity. | |
210 set_min_alignment((uintx) Generation::GenGrain); | |
211 set_max_alignment(compute_max_alignment()); | |
212 | |
213 CollectorPolicy::initialize_flags(); | |
214 | |
215 // All generational heaps have a youngest gen; handle those flags here. | |
216 | |
217 // Adjust max size parameters | |
218 if (NewSize > MaxNewSize) { | |
219 MaxNewSize = NewSize; | |
220 } | |
221 NewSize = align_size_down(NewSize, min_alignment()); | |
222 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
223 | |
224 // Check validity of heap flags | |
225 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
226 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
227 | |
228 if (NewSize < 3*min_alignment()) { | |
229 // make sure there room for eden and two survivor spaces | |
230 vm_exit_during_initialization("Too small new size specified"); | |
231 } | |
232 if (SurvivorRatio < 1 || NewRatio < 1) { | |
233 vm_exit_during_initialization("Invalid heap ratio specified"); | |
234 } | |
235 } | |
236 | |
237 void TwoGenerationCollectorPolicy::initialize_flags() { | |
238 GenCollectorPolicy::initialize_flags(); | |
239 | |
240 OldSize = align_size_down(OldSize, min_alignment()); | |
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241 |
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242 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(NewSize)) { |
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243 // NewRatio will be used later to set the young generation size so we use |
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244 // it to calculate how big the heap should be based on the requested OldSize |
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245 // and NewRatio. |
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246 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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247 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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248 |
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249 calculated_heapsize = align_size_up(calculated_heapsize, max_alignment()); |
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250 MaxHeapSize = calculated_heapsize; |
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251 InitialHeapSize = calculated_heapsize; |
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252 } |
0 | 253 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
254 | |
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255 // adjust max heap size if necessary |
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256 if (NewSize + OldSize > MaxHeapSize) { |
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257 if (FLAG_IS_CMDLINE(MaxHeapSize)) { |
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258 // somebody set a maximum heap size with the intention that we should not |
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259 // exceed it. Adjust New/OldSize as necessary. |
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260 uintx calculated_size = NewSize + OldSize; |
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261 double shrink_factor = (double) MaxHeapSize / calculated_size; |
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262 // align |
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263 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); |
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264 // OldSize is already aligned because above we aligned MaxHeapSize to |
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265 // max_alignment(), and we just made sure that NewSize is aligned to |
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266 // min_alignment(). In initialize_flags() we verified that max_alignment() |
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267 // is a multiple of min_alignment(). |
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268 OldSize = MaxHeapSize - NewSize; |
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269 } else { |
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270 MaxHeapSize = NewSize + OldSize; |
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271 } |
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272 } |
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273 // need to do this again |
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274 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
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275 |
10284 | 276 // adjust max heap size if necessary |
277 if (NewSize + OldSize > MaxHeapSize) { | |
278 if (FLAG_IS_CMDLINE(MaxHeapSize)) { | |
279 // somebody set a maximum heap size with the intention that we should not | |
280 // exceed it. Adjust New/OldSize as necessary. | |
281 uintx calculated_size = NewSize + OldSize; | |
282 double shrink_factor = (double) MaxHeapSize / calculated_size; | |
283 // align | |
284 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); | |
285 // OldSize is already aligned because above we aligned MaxHeapSize to | |
286 // max_alignment(), and we just made sure that NewSize is aligned to | |
287 // min_alignment(). In initialize_flags() we verified that max_alignment() | |
288 // is a multiple of min_alignment(). | |
289 OldSize = MaxHeapSize - NewSize; | |
290 } else { | |
291 MaxHeapSize = NewSize + OldSize; | |
292 } | |
293 } | |
294 // need to do this again | |
295 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
296 | |
0 | 297 always_do_update_barrier = UseConcMarkSweepGC; |
298 | |
299 // Check validity of heap flags | |
300 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
301 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
302 } | |
303 | |
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304 // Values set on the command line win over any ergonomically |
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305 // set command line parameters. |
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306 // Ergonomic choice of parameters are done before this |
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307 // method is called. Values for command line parameters such as NewSize |
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308 // and MaxNewSize feed those ergonomic choices into this method. |
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309 // This method makes the final generation sizings consistent with |
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310 // themselves and with overall heap sizings. |
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311 // In the absence of explicitly set command line flags, policies |
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312 // such as the use of NewRatio are used to size the generation. |
0 | 313 void GenCollectorPolicy::initialize_size_info() { |
314 CollectorPolicy::initialize_size_info(); | |
315 | |
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316 // min_alignment() is used for alignment within a generation. |
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317 // There is additional alignment done down stream for some |
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318 // collectors that sometimes causes unwanted rounding up of |
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319 // generations sizes. |
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320 |
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321 // Determine maximum size of gen0 |
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322 |
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323 size_t max_new_size = 0; |
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324 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) { |
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325 if (MaxNewSize < min_alignment()) { |
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326 max_new_size = min_alignment(); |
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327 } |
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328 if (MaxNewSize >= max_heap_byte_size()) { |
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329 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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330 min_alignment()); |
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331 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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332 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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333 "new generation size of " SIZE_FORMAT "k will be used.", |
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334 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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335 } else { |
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336 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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337 } |
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338 |
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339 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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340 // specially at this point to just use an ergonomically set |
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341 // MaxNewSize to set max_new_size. For cases with small |
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342 // heaps such a policy often did not work because the MaxNewSize |
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343 // was larger than the entire heap. The interpretation given |
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344 // to ergonomically set flags is that the flags are set |
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345 // by different collectors for their own special needs but |
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346 // are not allowed to badly shape the heap. This allows the |
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347 // different collectors to decide what's best for themselves |
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348 // without having to factor in the overall heap shape. It |
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349 // can be the case in the future that the collectors would |
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350 // only make "wise" ergonomics choices and this policy could |
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351 // just accept those choices. The choices currently made are |
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352 // not always "wise". |
0 | 353 } else { |
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354 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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355 // Bound the maximum size by NewSize below (since it historically |
0 | 356 // would have been NewSize and because the NewRatio calculation could |
357 // yield a size that is too small) and bound it by MaxNewSize above. | |
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358 // Ergonomics plays here by previously calculating the desired |
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359 // NewSize and MaxNewSize. |
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360 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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361 } |
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362 assert(max_new_size > 0, "All paths should set max_new_size"); |
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363 |
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364 // Given the maximum gen0 size, determine the initial and |
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365 // minimum gen0 sizes. |
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366 |
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367 if (max_heap_byte_size() == min_heap_byte_size()) { |
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368 // The maximum and minimum heap sizes are the same so |
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369 // the generations minimum and initial must be the |
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370 // same as its maximum. |
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371 set_min_gen0_size(max_new_size); |
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372 set_initial_gen0_size(max_new_size); |
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373 set_max_gen0_size(max_new_size); |
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374 } else { |
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375 size_t desired_new_size = 0; |
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376 if (!FLAG_IS_DEFAULT(NewSize)) { |
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377 // If NewSize is set ergonomically (for example by cms), it |
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378 // would make sense to use it. If it is used, also use it |
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379 // to set the initial size. Although there is no reason |
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380 // the minimum size and the initial size have to be the same, |
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381 // the current implementation gets into trouble during the calculation |
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382 // of the tenured generation sizes if they are different. |
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383 // Note that this makes the initial size and the minimum size |
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384 // generally small compared to the NewRatio calculation. |
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385 _min_gen0_size = NewSize; |
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386 desired_new_size = NewSize; |
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387 max_new_size = MAX2(max_new_size, NewSize); |
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388 } else { |
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389 // For the case where NewSize is the default, use NewRatio |
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390 // to size the minimum and initial generation sizes. |
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391 // Use the default NewSize as the floor for these values. If |
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392 // NewRatio is overly large, the resulting sizes can be too |
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393 // small. |
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394 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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395 NewSize); |
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396 desired_new_size = |
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397 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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398 NewSize); |
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399 } |
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400 |
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401 assert(_min_gen0_size > 0, "Sanity check"); |
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402 set_initial_gen0_size(desired_new_size); |
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403 set_max_gen0_size(max_new_size); |
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404 |
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405 // At this point the desirable initial and minimum sizes have been |
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406 // determined without regard to the maximum sizes. |
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407 |
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408 // Bound the sizes by the corresponding overall heap sizes. |
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409 set_min_gen0_size( |
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410 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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411 set_initial_gen0_size( |
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412 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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413 set_max_gen0_size( |
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414 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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415 |
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416 // At this point all three sizes have been checked against the |
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417 // maximum sizes but have not been checked for consistency |
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418 // among the three. |
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419 |
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420 // Final check min <= initial <= max |
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421 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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422 set_initial_gen0_size( |
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423 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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424 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 425 } |
426 | |
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427 if (PrintGCDetails && Verbose) { |
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428 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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429 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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430 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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431 } |
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432 } |
0 | 433 |
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434 // Call this method during the sizing of the gen1 to make |
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435 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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436 // the most freedom in sizing because it is done before the |
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437 // policy for gen1 is applied. Once gen1 policies have been applied, |
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438 // there may be conflicts in the shape of the heap and this method |
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439 // is used to make the needed adjustments. The application of the |
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440 // policies could be more sophisticated (iterative for example) but |
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441 // keeping it simple also seems a worthwhile goal. |
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442 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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443 size_t* gen1_size_ptr, |
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444 const size_t heap_size, |
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445 const size_t min_gen1_size) { |
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446 bool result = false; |
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447 |
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448 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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449 if ((heap_size < (*gen0_size_ptr + min_gen1_size)) && |
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450 (heap_size >= min_gen1_size + min_alignment())) { |
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451 // Adjust gen0 down to accommodate min_gen1_size |
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452 *gen0_size_ptr = heap_size - min_gen1_size; |
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453 *gen0_size_ptr = |
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454 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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455 min_alignment()); |
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456 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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457 result = true; |
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458 } else { |
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459 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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460 *gen1_size_ptr = |
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461 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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462 min_alignment()); |
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463 } |
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464 } |
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465 return result; |
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466 } |
0 | 467 |
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468 // Minimum sizes of the generations may be different than |
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469 // the initial sizes. An inconsistently is permitted here |
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470 // in the total size that can be specified explicitly by |
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471 // command line specification of OldSize and NewSize and |
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472 // also a command line specification of -Xms. Issue a warning |
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473 // but allow the values to pass. |
0 | 474 |
475 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
476 GenCollectorPolicy::initialize_size_info(); | |
477 | |
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478 // At this point the minimum, initial and maximum sizes |
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479 // of the overall heap and of gen0 have been determined. |
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480 // The maximum gen1 size can be determined from the maximum gen0 |
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481 // and maximum heap size since no explicit flags exits |
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482 // for setting the gen1 maximum. |
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483 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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484 _max_gen1_size = |
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485 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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486 min_alignment()); |
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487 // If no explicit command line flag has been set for the |
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488 // gen1 size, use what is left for gen1. |
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489 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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490 // The user has not specified any value or ergonomics |
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491 // has chosen a value (which may or may not be consistent |
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492 // with the overall heap size). In either case make |
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493 // the minimum, maximum and initial sizes consistent |
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494 // with the gen0 sizes and the overall heap sizes. |
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495 assert(min_heap_byte_size() > _min_gen0_size, |
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496 "gen0 has an unexpected minimum size"); |
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497 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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498 set_min_gen1_size( |
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499 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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500 min_alignment())); |
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501 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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502 set_initial_gen1_size( |
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503 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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504 min_alignment())); |
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505 |
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506 } else { |
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507 // It's been explicitly set on the command line. Use the |
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508 // OldSize and then determine the consequences. |
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509 set_min_gen1_size(OldSize); |
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510 set_initial_gen1_size(OldSize); |
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511 |
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512 // If the user has explicitly set an OldSize that is inconsistent |
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513 // with other command line flags, issue a warning. |
0 | 514 // The generation minimums and the overall heap mimimum should |
515 // be within one heap alignment. | |
13
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516 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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517 min_heap_byte_size()) { |
0 | 518 warning("Inconsistency between minimum heap size and minimum " |
13
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519 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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520 min_heap_byte_size()); |
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521 } |
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522 if ((OldSize > _max_gen1_size)) { |
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523 warning("Inconsistency between maximum heap size and maximum " |
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524 "generation sizes: using maximum heap = " SIZE_FORMAT |
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525 " -XX:OldSize flag is being ignored", |
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526 max_heap_byte_size()); |
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527 } |
13
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528 // If there is an inconsistency between the OldSize and the minimum and/or |
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529 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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530 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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531 min_heap_byte_size(), OldSize)) { |
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532 if (PrintGCDetails && Verbose) { |
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533 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
13
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534 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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535 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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536 } |
0 | 537 } |
13
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538 // Initial size |
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539 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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540 initial_heap_byte_size(), OldSize)) { |
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541 if (PrintGCDetails && Verbose) { |
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542 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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543 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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544 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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545 } |
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546 } |
0 | 547 } |
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548 // Enforce the maximum gen1 size. |
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549 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 550 |
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551 // Check that min gen1 <= initial gen1 <= max gen1 |
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552 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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553 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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554 |
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555 if (PrintGCDetails && Verbose) { |
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556 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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557 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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558 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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559 } |
0 | 560 } |
561 | |
562 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
563 bool is_tlab, | |
564 bool* gc_overhead_limit_was_exceeded) { | |
565 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
566 | |
567 debug_only(gch->check_for_valid_allocation_state()); | |
568 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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569 |
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570 // In general gc_overhead_limit_was_exceeded should be false so |
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571 // set it so here and reset it to true only if the gc time |
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572 // limit is being exceeded as checked below. |
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573 *gc_overhead_limit_was_exceeded = false; |
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574 |
0 | 575 HeapWord* result = NULL; |
576 | |
577 // Loop until the allocation is satisified, | |
578 // or unsatisfied after GC. | |
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579 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
0 | 580 HandleMark hm; // discard any handles allocated in each iteration |
581 | |
582 // First allocation attempt is lock-free. | |
583 Generation *gen0 = gch->get_gen(0); | |
584 assert(gen0->supports_inline_contig_alloc(), | |
585 "Otherwise, must do alloc within heap lock"); | |
586 if (gen0->should_allocate(size, is_tlab)) { | |
587 result = gen0->par_allocate(size, is_tlab); | |
588 if (result != NULL) { | |
589 assert(gch->is_in_reserved(result), "result not in heap"); | |
590 return result; | |
591 } | |
592 } | |
593 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
594 { | |
595 MutexLocker ml(Heap_lock); | |
596 if (PrintGC && Verbose) { | |
597 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
598 " attempting locked slow path allocation"); | |
599 } | |
600 // Note that only large objects get a shot at being | |
601 // allocated in later generations. | |
602 bool first_only = ! should_try_older_generation_allocation(size); | |
603 | |
604 result = gch->attempt_allocation(size, is_tlab, first_only); | |
605 if (result != NULL) { | |
606 assert(gch->is_in_reserved(result), "result not in heap"); | |
607 return result; | |
608 } | |
609 | |
610 if (GC_locker::is_active_and_needs_gc()) { | |
611 if (is_tlab) { | |
612 return NULL; // Caller will retry allocating individual object | |
613 } | |
614 if (!gch->is_maximal_no_gc()) { | |
615 // Try and expand heap to satisfy request | |
616 result = expand_heap_and_allocate(size, is_tlab); | |
617 // result could be null if we are out of space | |
618 if (result != NULL) { | |
619 return result; | |
620 } | |
621 } | |
622 | |
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623 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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624 return NULL; // we didn't get to do a GC and we didn't get any memory |
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625 } |
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626 |
0 | 627 // If this thread is not in a jni critical section, we stall |
628 // the requestor until the critical section has cleared and | |
629 // GC allowed. When the critical section clears, a GC is | |
630 // initiated by the last thread exiting the critical section; so | |
631 // we retry the allocation sequence from the beginning of the loop, | |
632 // rather than causing more, now probably unnecessary, GC attempts. | |
633 JavaThread* jthr = JavaThread::current(); | |
634 if (!jthr->in_critical()) { | |
635 MutexUnlocker mul(Heap_lock); | |
636 // Wait for JNI critical section to be exited | |
637 GC_locker::stall_until_clear(); | |
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638 gclocker_stalled_count += 1; |
0 | 639 continue; |
640 } else { | |
641 if (CheckJNICalls) { | |
642 fatal("Possible deadlock due to allocating while" | |
643 " in jni critical section"); | |
644 } | |
645 return NULL; | |
646 } | |
647 } | |
648 | |
649 // Read the gc count while the heap lock is held. | |
650 gc_count_before = Universe::heap()->total_collections(); | |
651 } | |
652 | |
653 VM_GenCollectForAllocation op(size, | |
654 is_tlab, | |
655 gc_count_before); | |
656 VMThread::execute(&op); | |
657 if (op.prologue_succeeded()) { | |
658 result = op.result(); | |
659 if (op.gc_locked()) { | |
660 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
661 continue; // retry and/or stall as necessary | |
662 } | |
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663 |
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664 // Allocation has failed and a collection |
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665 // has been done. If the gc time limit was exceeded the |
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666 // this time, return NULL so that an out-of-memory |
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667 // will be thrown. Clear gc_overhead_limit_exceeded |
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668 // so that the overhead exceeded does not persist. |
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669 |
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670 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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671 const bool softrefs_clear = all_soft_refs_clear(); |
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672 |
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673 if (limit_exceeded && softrefs_clear) { |
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674 *gc_overhead_limit_was_exceeded = true; |
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675 size_policy()->set_gc_overhead_limit_exceeded(false); |
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676 if (op.result() != NULL) { |
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677 CollectedHeap::fill_with_object(op.result(), size); |
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678 } |
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679 return NULL; |
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680 } |
0 | 681 assert(result == NULL || gch->is_in_reserved(result), |
682 "result not in heap"); | |
683 return result; | |
684 } | |
685 | |
686 // Give a warning if we seem to be looping forever. | |
687 if ((QueuedAllocationWarningCount > 0) && | |
688 (try_count % QueuedAllocationWarningCount == 0)) { | |
689 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
690 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
691 } | |
692 } | |
693 } | |
694 | |
695 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
696 bool is_tlab) { | |
697 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
698 HeapWord* result = NULL; | |
699 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
700 Generation *gen = gch->get_gen(i); | |
701 if (gen->should_allocate(size, is_tlab)) { | |
702 result = gen->expand_and_allocate(size, is_tlab); | |
703 } | |
704 } | |
705 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
706 return result; | |
707 } | |
708 | |
709 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
710 bool is_tlab) { | |
711 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
712 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
713 HeapWord* result = NULL; | |
714 | |
715 assert(size != 0, "Precondition violated"); | |
716 if (GC_locker::is_active_and_needs_gc()) { | |
717 // GC locker is active; instead of a collection we will attempt | |
718 // to expand the heap, if there's room for expansion. | |
719 if (!gch->is_maximal_no_gc()) { | |
720 result = expand_heap_and_allocate(size, is_tlab); | |
721 } | |
722 return result; // could be null if we are out of space | |
1994
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723 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 724 // Do an incremental collection. |
725 gch->do_collection(false /* full */, | |
726 false /* clear_all_soft_refs */, | |
727 size /* size */, | |
728 is_tlab /* is_tlab */, | |
729 number_of_generations() - 1 /* max_level */); | |
730 } else { | |
1994
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diff
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731 if (Verbose && PrintGCDetails) { |
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732 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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|
733 } |
0 | 734 // Try a full collection; see delta for bug id 6266275 |
735 // for the original code and why this has been simplified | |
736 // with from-space allocation criteria modified and | |
737 // such allocation moved out of the safepoint path. | |
738 gch->do_collection(true /* full */, | |
739 false /* clear_all_soft_refs */, | |
740 size /* size */, | |
741 is_tlab /* is_tlab */, | |
742 number_of_generations() - 1 /* max_level */); | |
743 } | |
744 | |
745 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
746 | |
747 if (result != NULL) { | |
748 assert(gch->is_in_reserved(result), "result not in heap"); | |
749 return result; | |
750 } | |
751 | |
752 // OK, collection failed, try expansion. | |
753 result = expand_heap_and_allocate(size, is_tlab); | |
754 if (result != NULL) { | |
755 return result; | |
756 } | |
757 | |
758 // If we reach this point, we're really out of memory. Try every trick | |
759 // we can to reclaim memory. Force collection of soft references. Force | |
760 // a complete compaction of the heap. Any additional methods for finding | |
761 // free memory should be here, especially if they are expensive. If this | |
762 // attempt fails, an OOM exception will be thrown. | |
763 { | |
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764 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
0 | 765 |
766 gch->do_collection(true /* full */, | |
767 true /* clear_all_soft_refs */, | |
768 size /* size */, | |
769 is_tlab /* is_tlab */, | |
770 number_of_generations() - 1 /* max_level */); | |
771 } | |
772 | |
773 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
774 if (result != NULL) { | |
775 assert(gch->is_in_reserved(result), "result not in heap"); | |
776 return result; | |
777 } | |
778 | |
1387
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779 assert(!should_clear_all_soft_refs(), |
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780 "Flag should have been handled and cleared prior to this point"); |
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781 |
0 | 782 // What else? We might try synchronous finalization later. If the total |
783 // space available is large enough for the allocation, then a more | |
784 // complete compaction phase than we've tried so far might be | |
785 // appropriate. | |
786 return NULL; | |
787 } | |
788 | |
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789 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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790 ClassLoaderData* loader_data, |
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791 size_t word_size, |
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792 Metaspace::MetadataType mdtype) { |
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793 uint loop_count = 0; |
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794 uint gc_count = 0; |
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795 uint full_gc_count = 0; |
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796 |
6923
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797 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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798 |
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799 do { |
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800 MetaWord* result = NULL; |
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801 if (GC_locker::is_active_and_needs_gc()) { |
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802 // If the GC_locker is active, just expand and allocate. |
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803 // If that does not succeed, wait if this thread is not |
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804 // in a critical section itself. |
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805 result = |
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806 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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807 mdtype); |
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808 if (result != NULL) { |
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809 return result; |
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810 } |
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811 JavaThread* jthr = JavaThread::current(); |
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812 if (!jthr->in_critical()) { |
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813 // Wait for JNI critical section to be exited |
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814 GC_locker::stall_until_clear(); |
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815 // The GC invoked by the last thread leaving the critical |
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816 // section will be a young collection and a full collection |
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817 // is (currently) needed for unloading classes so continue |
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818 // to the next iteration to get a full GC. |
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819 continue; |
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820 } else { |
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821 if (CheckJNICalls) { |
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822 fatal("Possible deadlock due to allocating while" |
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823 " in jni critical section"); |
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824 } |
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825 return NULL; |
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826 } |
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827 } |
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828 |
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829 { // Need lock to get self consistent gc_count's |
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830 MutexLocker ml(Heap_lock); |
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831 gc_count = Universe::heap()->total_collections(); |
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832 full_gc_count = Universe::heap()->total_full_collections(); |
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833 } |
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834 |
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835 // Generate a VM operation |
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836 VM_CollectForMetadataAllocation op(loader_data, |
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837 word_size, |
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838 mdtype, |
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839 gc_count, |
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840 full_gc_count, |
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841 GCCause::_metadata_GC_threshold); |
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842 VMThread::execute(&op); |
7446
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843 |
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844 // If GC was locked out, try again. Check |
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845 // before checking success because the prologue |
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846 // could have succeeded and the GC still have |
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847 // been locked out. |
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848 if (op.gc_locked()) { |
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849 continue; |
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850 } |
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851 |
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852 if (op.prologue_succeeded()) { |
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853 return op.result(); |
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854 } |
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855 loop_count++; |
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856 if ((QueuedAllocationWarningCount > 0) && |
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857 (loop_count % QueuedAllocationWarningCount == 0)) { |
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858 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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859 " size=%d", loop_count, word_size); |
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860 } |
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861 } while (true); // Until a GC is done |
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862 } |
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863 |
0 | 864 // Return true if any of the following is true: |
865 // . the allocation won't fit into the current young gen heap | |
866 // . gc locker is occupied (jni critical section) | |
867 // . heap memory is tight -- the most recent previous collection | |
868 // was a full collection because a partial collection (would | |
869 // have) failed and is likely to fail again | |
870 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
871 size_t word_size) const { | |
872 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
873 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
874 return (word_size > heap_word_size(gen0_capacity)) | |
1888
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875 || GC_locker::is_active_and_needs_gc() |
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876 || gch->incremental_collection_failed(); |
0 | 877 } |
878 | |
879 | |
880 // | |
881 // MarkSweepPolicy methods | |
882 // | |
883 | |
884 MarkSweepPolicy::MarkSweepPolicy() { | |
885 initialize_all(); | |
886 } | |
887 | |
888 void MarkSweepPolicy::initialize_generations() { | |
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889 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL); |
0 | 890 if (_generations == NULL) |
891 vm_exit_during_initialization("Unable to allocate gen spec"); | |
892 | |
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893 if (UseParNewGC) { |
0 | 894 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
895 } else { | |
896 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
897 } | |
898 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
899 | |
900 if (_generations[0] == NULL || _generations[1] == NULL) | |
901 vm_exit_during_initialization("Unable to allocate gen spec"); | |
902 } | |
903 | |
904 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
905 // initialize the policy counters - 2 collectors, 3 generations | |
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906 if (UseParNewGC) { |
0 | 907 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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ca0a78017dc7
8005396: Use ParNew with only one thread instead of DefNew as default for CMS on single CPU machines
brutisso
parents:
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diff
changeset
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908 } else { |
0 | 909 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
910 } | |
911 } |