Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 12288:a7609ec351d6
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author | dcubed |
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date | Fri, 20 Sep 2013 18:19:07 -0700 |
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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 if (!is_size_aligned(MaxMetaspaceSize, max_alignment())) { |
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68 FLAG_SET_ERGO(uintx, MaxMetaspaceSize, |
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69 restricted_align_down(MaxMetaspaceSize, max_alignment())); |
0 | 70 } |
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71 |
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72 if (MetaspaceSize > MaxMetaspaceSize) { |
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73 FLAG_SET_ERGO(uintx, MetaspaceSize, MaxMetaspaceSize); |
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74 } |
0 | 75 |
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76 if (!is_size_aligned(MetaspaceSize, min_alignment())) { |
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77 FLAG_SET_ERGO(uintx, MetaspaceSize, |
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78 restricted_align_down(MetaspaceSize, min_alignment())); |
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79 } |
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80 |
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81 assert(MetaspaceSize <= MaxMetaspaceSize, "Must be"); |
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82 |
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83 MinMetaspaceExpansion = restricted_align_down(MinMetaspaceExpansion, min_alignment()); |
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84 MaxMetaspaceExpansion = restricted_align_down(MaxMetaspaceExpansion, min_alignment()); |
0 | 85 |
86 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
87 | |
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88 assert(MetaspaceSize % min_alignment() == 0, "metapace alignment"); |
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89 assert(MaxMetaspaceSize % max_alignment() == 0, "maximum metaspace alignment"); |
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90 if (MetaspaceSize < 256*K) { |
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91 vm_exit_during_initialization("Too small initial Metaspace size"); |
0 | 92 } |
93 } | |
94 | |
95 void CollectorPolicy::initialize_size_info() { | |
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96 // User inputs from -mx and ms must be aligned |
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97 set_min_heap_byte_size(align_size_up(Arguments::min_heap_size(), min_alignment())); |
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98 set_initial_heap_byte_size(align_size_up(InitialHeapSize, min_alignment())); |
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99 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
0 | 100 |
101 // Check heap parameter properties | |
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102 if (initial_heap_byte_size() < M) { |
0 | 103 vm_exit_during_initialization("Too small initial heap"); |
104 } | |
105 // Check heap parameter properties | |
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106 if (min_heap_byte_size() < M) { |
0 | 107 vm_exit_during_initialization("Too small minimum heap"); |
108 } | |
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109 if (initial_heap_byte_size() <= NewSize) { |
0 | 110 // make sure there is at least some room in old space |
111 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
112 } | |
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113 if (max_heap_byte_size() < min_heap_byte_size()) { |
0 | 114 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
115 } | |
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116 if (initial_heap_byte_size() < min_heap_byte_size()) { |
0 | 117 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
118 } | |
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119 if (max_heap_byte_size() < initial_heap_byte_size()) { |
0 | 120 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
121 } | |
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122 |
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123 if (PrintGCDetails && Verbose) { |
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124 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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125 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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126 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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127 } |
0 | 128 } |
129 | |
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130 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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131 bool result = _should_clear_all_soft_refs; |
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132 set_should_clear_all_soft_refs(false); |
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133 return result; |
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134 } |
0 | 135 |
136 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
137 int max_covered_regions) { | |
138 switch (rem_set_name()) { | |
139 case GenRemSet::CardTable: { | |
140 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
141 return res; | |
142 } | |
143 default: | |
144 guarantee(false, "unrecognized GenRemSet::Name"); | |
145 return NULL; | |
146 } | |
147 } | |
148 | |
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149 void CollectorPolicy::cleared_all_soft_refs() { |
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150 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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151 // have been cleared in the last collection but if the gc overhear |
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152 // limit continues to be near, SoftRefs should still be cleared. |
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153 if (size_policy() != NULL) { |
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154 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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155 } |
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156 _all_soft_refs_clear = true; |
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157 } |
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158 |
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159 size_t CollectorPolicy::compute_max_alignment() { |
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160 // The card marking array and the offset arrays for old generations are |
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161 // committed in os pages as well. Make sure they are entirely full (to |
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162 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 |
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163 // byte entry and the os page size is 4096, the maximum heap size should |
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164 // be 512*4096 = 2MB aligned. |
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165 |
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166 // There is only the GenRemSet in Hotspot and only the GenRemSet::CardTable |
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167 // is supported. |
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168 // Requirements of any new remembered set implementations must be added here. |
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169 size_t alignment = GenRemSet::max_alignment_constraint(GenRemSet::CardTable); |
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170 |
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171 // Parallel GC does its own alignment of the generations to avoid requiring a |
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172 // large page (256M on some platforms) for the permanent generation. The |
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173 // other collectors should also be updated to do their own alignment and then |
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174 // this use of lcm() should be removed. |
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175 if (UseLargePages && !UseParallelGC) { |
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176 // in presence of large pages we have to make sure that our |
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177 // alignment is large page aware |
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178 alignment = lcm(os::large_page_size(), alignment); |
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179 } |
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180 |
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181 return alignment; |
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182 } |
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183 |
0 | 184 // GenCollectorPolicy methods. |
185 | |
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186 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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187 size_t x = base_size / (NewRatio+1); |
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188 size_t new_gen_size = x > min_alignment() ? |
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189 align_size_down(x, min_alignment()) : |
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190 min_alignment(); |
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191 return new_gen_size; |
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192 } |
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193 |
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194 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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195 size_t maximum_size) { |
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196 size_t alignment = min_alignment(); |
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197 size_t max_minus = maximum_size - alignment; |
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198 return desired_size < max_minus ? desired_size : max_minus; |
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199 } |
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200 |
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201 |
0 | 202 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
203 size_t init_promo_size, | |
204 size_t init_survivor_size) { | |
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205 const double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; |
0 | 206 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
207 init_promo_size, | |
208 init_survivor_size, | |
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209 max_gc_pause_sec, |
0 | 210 GCTimeRatio); |
211 } | |
212 | |
213 void GenCollectorPolicy::initialize_flags() { | |
214 // All sizes must be multiples of the generation granularity. | |
215 set_min_alignment((uintx) Generation::GenGrain); | |
216 set_max_alignment(compute_max_alignment()); | |
217 | |
218 CollectorPolicy::initialize_flags(); | |
219 | |
220 // All generational heaps have a youngest gen; handle those flags here. | |
221 | |
222 // Adjust max size parameters | |
223 if (NewSize > MaxNewSize) { | |
224 MaxNewSize = NewSize; | |
225 } | |
226 NewSize = align_size_down(NewSize, min_alignment()); | |
227 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
228 | |
229 // Check validity of heap flags | |
230 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
231 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
232 | |
233 if (NewSize < 3*min_alignment()) { | |
234 // make sure there room for eden and two survivor spaces | |
235 vm_exit_during_initialization("Too small new size specified"); | |
236 } | |
237 if (SurvivorRatio < 1 || NewRatio < 1) { | |
238 vm_exit_during_initialization("Invalid heap ratio specified"); | |
239 } | |
240 } | |
241 | |
242 void TwoGenerationCollectorPolicy::initialize_flags() { | |
243 GenCollectorPolicy::initialize_flags(); | |
244 | |
245 OldSize = align_size_down(OldSize, min_alignment()); | |
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246 |
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247 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(NewSize)) { |
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248 // NewRatio will be used later to set the young generation size so we use |
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249 // it to calculate how big the heap should be based on the requested OldSize |
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250 // and NewRatio. |
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251 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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252 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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253 |
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254 calculated_heapsize = align_size_up(calculated_heapsize, max_alignment()); |
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255 MaxHeapSize = calculated_heapsize; |
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256 InitialHeapSize = calculated_heapsize; |
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257 } |
0 | 258 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
259 | |
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260 // adjust max heap size if necessary |
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261 if (NewSize + OldSize > MaxHeapSize) { |
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262 if (FLAG_IS_CMDLINE(MaxHeapSize)) { |
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263 // somebody set a maximum heap size with the intention that we should not |
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264 // exceed it. Adjust New/OldSize as necessary. |
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265 uintx calculated_size = NewSize + OldSize; |
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266 double shrink_factor = (double) MaxHeapSize / calculated_size; |
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267 // align |
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268 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); |
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269 // OldSize is already aligned because above we aligned MaxHeapSize to |
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270 // max_alignment(), and we just made sure that NewSize is aligned to |
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271 // min_alignment(). In initialize_flags() we verified that max_alignment() |
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272 // is a multiple of min_alignment(). |
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273 OldSize = MaxHeapSize - NewSize; |
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274 } else { |
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275 MaxHeapSize = NewSize + OldSize; |
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276 } |
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277 } |
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278 // need to do this again |
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279 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
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280 |
10284 | 281 // adjust max heap size if necessary |
282 if (NewSize + OldSize > MaxHeapSize) { | |
283 if (FLAG_IS_CMDLINE(MaxHeapSize)) { | |
284 // somebody set a maximum heap size with the intention that we should not | |
285 // exceed it. Adjust New/OldSize as necessary. | |
286 uintx calculated_size = NewSize + OldSize; | |
287 double shrink_factor = (double) MaxHeapSize / calculated_size; | |
288 // align | |
289 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); | |
290 // OldSize is already aligned because above we aligned MaxHeapSize to | |
291 // max_alignment(), and we just made sure that NewSize is aligned to | |
292 // min_alignment(). In initialize_flags() we verified that max_alignment() | |
293 // is a multiple of min_alignment(). | |
294 OldSize = MaxHeapSize - NewSize; | |
295 } else { | |
296 MaxHeapSize = NewSize + OldSize; | |
297 } | |
298 } | |
299 // need to do this again | |
300 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
301 | |
0 | 302 always_do_update_barrier = UseConcMarkSweepGC; |
303 | |
304 // Check validity of heap flags | |
305 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
306 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
307 } | |
308 | |
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309 // Values set on the command line win over any ergonomically |
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310 // set command line parameters. |
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311 // Ergonomic choice of parameters are done before this |
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312 // method is called. Values for command line parameters such as NewSize |
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313 // and MaxNewSize feed those ergonomic choices into this method. |
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314 // This method makes the final generation sizings consistent with |
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315 // themselves and with overall heap sizings. |
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316 // In the absence of explicitly set command line flags, policies |
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317 // such as the use of NewRatio are used to size the generation. |
0 | 318 void GenCollectorPolicy::initialize_size_info() { |
319 CollectorPolicy::initialize_size_info(); | |
320 | |
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321 // min_alignment() is used for alignment within a generation. |
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322 // There is additional alignment done down stream for some |
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323 // collectors that sometimes causes unwanted rounding up of |
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324 // generations sizes. |
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325 |
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326 // Determine maximum size of gen0 |
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327 |
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328 size_t max_new_size = 0; |
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329 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) { |
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330 if (MaxNewSize < min_alignment()) { |
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331 max_new_size = min_alignment(); |
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332 } |
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333 if (MaxNewSize >= max_heap_byte_size()) { |
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334 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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335 min_alignment()); |
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336 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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337 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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338 "new generation size of " SIZE_FORMAT "k will be used.", |
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339 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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340 } else { |
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341 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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342 } |
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343 |
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344 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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345 // specially at this point to just use an ergonomically set |
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346 // MaxNewSize to set max_new_size. For cases with small |
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347 // heaps such a policy often did not work because the MaxNewSize |
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348 // was larger than the entire heap. The interpretation given |
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349 // to ergonomically set flags is that the flags are set |
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350 // by different collectors for their own special needs but |
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351 // are not allowed to badly shape the heap. This allows the |
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352 // different collectors to decide what's best for themselves |
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353 // without having to factor in the overall heap shape. It |
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354 // can be the case in the future that the collectors would |
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355 // only make "wise" ergonomics choices and this policy could |
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356 // just accept those choices. The choices currently made are |
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357 // not always "wise". |
0 | 358 } else { |
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359 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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360 // Bound the maximum size by NewSize below (since it historically |
0 | 361 // would have been NewSize and because the NewRatio calculation could |
362 // yield a size that is too small) and bound it by MaxNewSize above. | |
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363 // Ergonomics plays here by previously calculating the desired |
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364 // NewSize and MaxNewSize. |
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365 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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366 } |
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367 assert(max_new_size > 0, "All paths should set max_new_size"); |
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368 |
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369 // Given the maximum gen0 size, determine the initial and |
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370 // minimum gen0 sizes. |
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371 |
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372 if (max_heap_byte_size() == min_heap_byte_size()) { |
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373 // The maximum and minimum heap sizes are the same so |
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374 // the generations minimum and initial must be the |
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375 // same as its maximum. |
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376 set_min_gen0_size(max_new_size); |
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377 set_initial_gen0_size(max_new_size); |
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378 set_max_gen0_size(max_new_size); |
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379 } else { |
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380 size_t desired_new_size = 0; |
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381 if (!FLAG_IS_DEFAULT(NewSize)) { |
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382 // If NewSize is set ergonomically (for example by cms), it |
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383 // would make sense to use it. If it is used, also use it |
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384 // to set the initial size. Although there is no reason |
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385 // the minimum size and the initial size have to be the same, |
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386 // the current implementation gets into trouble during the calculation |
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387 // of the tenured generation sizes if they are different. |
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388 // Note that this makes the initial size and the minimum size |
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389 // generally small compared to the NewRatio calculation. |
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390 _min_gen0_size = NewSize; |
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391 desired_new_size = NewSize; |
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392 max_new_size = MAX2(max_new_size, NewSize); |
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393 } else { |
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394 // For the case where NewSize is the default, use NewRatio |
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395 // to size the minimum and initial generation sizes. |
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396 // Use the default NewSize as the floor for these values. If |
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397 // NewRatio is overly large, the resulting sizes can be too |
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398 // small. |
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399 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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400 NewSize); |
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401 desired_new_size = |
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402 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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403 NewSize); |
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404 } |
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405 |
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406 assert(_min_gen0_size > 0, "Sanity check"); |
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407 set_initial_gen0_size(desired_new_size); |
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408 set_max_gen0_size(max_new_size); |
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409 |
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410 // At this point the desirable initial and minimum sizes have been |
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411 // determined without regard to the maximum sizes. |
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412 |
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413 // Bound the sizes by the corresponding overall heap sizes. |
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414 set_min_gen0_size( |
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415 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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416 set_initial_gen0_size( |
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417 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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418 set_max_gen0_size( |
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419 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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420 |
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421 // At this point all three sizes have been checked against the |
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422 // maximum sizes but have not been checked for consistency |
342
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423 // among the three. |
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424 |
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425 // Final check min <= initial <= max |
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426 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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427 set_initial_gen0_size( |
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428 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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429 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 430 } |
431 | |
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432 if (PrintGCDetails && Verbose) { |
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433 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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434 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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435 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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436 } |
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437 } |
0 | 438 |
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439 // Call this method during the sizing of the gen1 to make |
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440 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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441 // the most freedom in sizing because it is done before the |
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442 // policy for gen1 is applied. Once gen1 policies have been applied, |
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443 // there may be conflicts in the shape of the heap and this method |
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444 // is used to make the needed adjustments. The application of the |
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445 // policies could be more sophisticated (iterative for example) but |
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446 // keeping it simple also seems a worthwhile goal. |
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447 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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448 size_t* gen1_size_ptr, |
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449 const size_t heap_size, |
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450 const size_t min_gen1_size) { |
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451 bool result = false; |
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452 |
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453 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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454 if ((heap_size < (*gen0_size_ptr + min_gen1_size)) && |
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455 (heap_size >= min_gen1_size + min_alignment())) { |
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456 // Adjust gen0 down to accommodate min_gen1_size |
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457 *gen0_size_ptr = heap_size - min_gen1_size; |
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458 *gen0_size_ptr = |
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459 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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460 min_alignment()); |
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461 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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462 result = true; |
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463 } else { |
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464 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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465 *gen1_size_ptr = |
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466 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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467 min_alignment()); |
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468 } |
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469 } |
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470 return result; |
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471 } |
0 | 472 |
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473 // Minimum sizes of the generations may be different than |
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474 // the initial sizes. An inconsistently is permitted here |
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475 // in the total size that can be specified explicitly by |
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476 // command line specification of OldSize and NewSize and |
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477 // also a command line specification of -Xms. Issue a warning |
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478 // but allow the values to pass. |
0 | 479 |
480 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
481 GenCollectorPolicy::initialize_size_info(); | |
482 | |
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483 // At this point the minimum, initial and maximum sizes |
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484 // of the overall heap and of gen0 have been determined. |
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485 // The maximum gen1 size can be determined from the maximum gen0 |
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486 // and maximum heap size since no explicit flags exits |
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487 // for setting the gen1 maximum. |
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488 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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489 _max_gen1_size = |
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490 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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491 min_alignment()); |
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492 // If no explicit command line flag has been set for the |
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493 // gen1 size, use what is left for gen1. |
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494 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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495 // The user has not specified any value or ergonomics |
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496 // has chosen a value (which may or may not be consistent |
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497 // with the overall heap size). In either case make |
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498 // the minimum, maximum and initial sizes consistent |
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499 // with the gen0 sizes and the overall heap sizes. |
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500 assert(min_heap_byte_size() > _min_gen0_size, |
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501 "gen0 has an unexpected minimum size"); |
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502 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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503 set_min_gen1_size( |
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504 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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505 min_alignment())); |
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506 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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507 set_initial_gen1_size( |
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508 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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509 min_alignment())); |
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510 |
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511 } else { |
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512 // It's been explicitly set on the command line. Use the |
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513 // OldSize and then determine the consequences. |
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514 set_min_gen1_size(OldSize); |
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515 set_initial_gen1_size(OldSize); |
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516 |
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517 // If the user has explicitly set an OldSize that is inconsistent |
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518 // with other command line flags, issue a warning. |
0 | 519 // The generation minimums and the overall heap mimimum should |
520 // be within one heap alignment. | |
13
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521 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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522 min_heap_byte_size()) { |
0 | 523 warning("Inconsistency between minimum heap size and minimum " |
13
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524 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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525 min_heap_byte_size()); |
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526 } |
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527 if ((OldSize > _max_gen1_size)) { |
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528 warning("Inconsistency between maximum heap size and maximum " |
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529 "generation sizes: using maximum heap = " SIZE_FORMAT |
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530 " -XX:OldSize flag is being ignored", |
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531 max_heap_byte_size()); |
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532 } |
13
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533 // If there is an inconsistency between the OldSize and the minimum and/or |
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534 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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535 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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536 min_heap_byte_size(), OldSize)) { |
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537 if (PrintGCDetails && Verbose) { |
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538 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
13
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539 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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540 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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541 } |
0 | 542 } |
13
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543 // Initial size |
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544 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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545 initial_heap_byte_size(), OldSize)) { |
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546 if (PrintGCDetails && Verbose) { |
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547 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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548 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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549 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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550 } |
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551 } |
0 | 552 } |
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553 // Enforce the maximum gen1 size. |
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554 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 555 |
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556 // Check that min gen1 <= initial gen1 <= max gen1 |
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557 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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558 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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559 |
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560 if (PrintGCDetails && Verbose) { |
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561 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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562 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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563 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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564 } |
0 | 565 } |
566 | |
567 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
568 bool is_tlab, | |
569 bool* gc_overhead_limit_was_exceeded) { | |
570 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
571 | |
572 debug_only(gch->check_for_valid_allocation_state()); | |
573 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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574 |
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575 // In general gc_overhead_limit_was_exceeded should be false so |
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576 // set it so here and reset it to true only if the gc time |
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577 // limit is being exceeded as checked below. |
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578 *gc_overhead_limit_was_exceeded = false; |
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579 |
0 | 580 HeapWord* result = NULL; |
581 | |
582 // Loop until the allocation is satisified, | |
583 // or unsatisfied after GC. | |
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584 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
0 | 585 HandleMark hm; // discard any handles allocated in each iteration |
586 | |
587 // First allocation attempt is lock-free. | |
588 Generation *gen0 = gch->get_gen(0); | |
589 assert(gen0->supports_inline_contig_alloc(), | |
590 "Otherwise, must do alloc within heap lock"); | |
591 if (gen0->should_allocate(size, is_tlab)) { | |
592 result = gen0->par_allocate(size, is_tlab); | |
593 if (result != NULL) { | |
594 assert(gch->is_in_reserved(result), "result not in heap"); | |
595 return result; | |
596 } | |
597 } | |
598 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
599 { | |
600 MutexLocker ml(Heap_lock); | |
601 if (PrintGC && Verbose) { | |
602 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
603 " attempting locked slow path allocation"); | |
604 } | |
605 // Note that only large objects get a shot at being | |
606 // allocated in later generations. | |
607 bool first_only = ! should_try_older_generation_allocation(size); | |
608 | |
609 result = gch->attempt_allocation(size, is_tlab, first_only); | |
610 if (result != NULL) { | |
611 assert(gch->is_in_reserved(result), "result not in heap"); | |
612 return result; | |
613 } | |
614 | |
615 if (GC_locker::is_active_and_needs_gc()) { | |
616 if (is_tlab) { | |
617 return NULL; // Caller will retry allocating individual object | |
618 } | |
619 if (!gch->is_maximal_no_gc()) { | |
620 // Try and expand heap to satisfy request | |
621 result = expand_heap_and_allocate(size, is_tlab); | |
622 // result could be null if we are out of space | |
623 if (result != NULL) { | |
624 return result; | |
625 } | |
626 } | |
627 | |
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628 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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629 return NULL; // we didn't get to do a GC and we didn't get any memory |
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630 } |
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631 |
0 | 632 // If this thread is not in a jni critical section, we stall |
633 // the requestor until the critical section has cleared and | |
634 // GC allowed. When the critical section clears, a GC is | |
635 // initiated by the last thread exiting the critical section; so | |
636 // we retry the allocation sequence from the beginning of the loop, | |
637 // rather than causing more, now probably unnecessary, GC attempts. | |
638 JavaThread* jthr = JavaThread::current(); | |
639 if (!jthr->in_critical()) { | |
640 MutexUnlocker mul(Heap_lock); | |
641 // Wait for JNI critical section to be exited | |
642 GC_locker::stall_until_clear(); | |
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643 gclocker_stalled_count += 1; |
0 | 644 continue; |
645 } else { | |
646 if (CheckJNICalls) { | |
647 fatal("Possible deadlock due to allocating while" | |
648 " in jni critical section"); | |
649 } | |
650 return NULL; | |
651 } | |
652 } | |
653 | |
654 // Read the gc count while the heap lock is held. | |
655 gc_count_before = Universe::heap()->total_collections(); | |
656 } | |
657 | |
658 VM_GenCollectForAllocation op(size, | |
659 is_tlab, | |
660 gc_count_before); | |
661 VMThread::execute(&op); | |
662 if (op.prologue_succeeded()) { | |
663 result = op.result(); | |
664 if (op.gc_locked()) { | |
665 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
666 continue; // retry and/or stall as necessary | |
667 } | |
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668 |
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669 // Allocation has failed and a collection |
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670 // has been done. If the gc time limit was exceeded the |
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671 // this time, return NULL so that an out-of-memory |
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672 // will be thrown. Clear gc_overhead_limit_exceeded |
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673 // so that the overhead exceeded does not persist. |
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674 |
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675 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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676 const bool softrefs_clear = all_soft_refs_clear(); |
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677 |
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678 if (limit_exceeded && softrefs_clear) { |
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679 *gc_overhead_limit_was_exceeded = true; |
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680 size_policy()->set_gc_overhead_limit_exceeded(false); |
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681 if (op.result() != NULL) { |
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682 CollectedHeap::fill_with_object(op.result(), size); |
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683 } |
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684 return NULL; |
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685 } |
0 | 686 assert(result == NULL || gch->is_in_reserved(result), |
687 "result not in heap"); | |
688 return result; | |
689 } | |
690 | |
691 // Give a warning if we seem to be looping forever. | |
692 if ((QueuedAllocationWarningCount > 0) && | |
693 (try_count % QueuedAllocationWarningCount == 0)) { | |
694 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
695 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
696 } | |
697 } | |
698 } | |
699 | |
700 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
701 bool is_tlab) { | |
702 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
703 HeapWord* result = NULL; | |
704 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
705 Generation *gen = gch->get_gen(i); | |
706 if (gen->should_allocate(size, is_tlab)) { | |
707 result = gen->expand_and_allocate(size, is_tlab); | |
708 } | |
709 } | |
710 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
711 return result; | |
712 } | |
713 | |
714 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
715 bool is_tlab) { | |
716 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
717 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
718 HeapWord* result = NULL; | |
719 | |
720 assert(size != 0, "Precondition violated"); | |
721 if (GC_locker::is_active_and_needs_gc()) { | |
722 // GC locker is active; instead of a collection we will attempt | |
723 // to expand the heap, if there's room for expansion. | |
724 if (!gch->is_maximal_no_gc()) { | |
725 result = expand_heap_and_allocate(size, is_tlab); | |
726 } | |
727 return result; // could be null if we are out of space | |
1994
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|
728 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 729 // Do an incremental collection. |
730 gch->do_collection(false /* full */, | |
731 false /* clear_all_soft_refs */, | |
732 size /* size */, | |
733 is_tlab /* is_tlab */, | |
734 number_of_generations() - 1 /* max_level */); | |
735 } else { | |
1994
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|
736 if (Verbose && PrintGCDetails) { |
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|
737 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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738 } |
0 | 739 // Try a full collection; see delta for bug id 6266275 |
740 // for the original code and why this has been simplified | |
741 // with from-space allocation criteria modified and | |
742 // such allocation moved out of the safepoint path. | |
743 gch->do_collection(true /* full */, | |
744 false /* clear_all_soft_refs */, | |
745 size /* size */, | |
746 is_tlab /* is_tlab */, | |
747 number_of_generations() - 1 /* max_level */); | |
748 } | |
749 | |
750 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
751 | |
752 if (result != NULL) { | |
753 assert(gch->is_in_reserved(result), "result not in heap"); | |
754 return result; | |
755 } | |
756 | |
757 // OK, collection failed, try expansion. | |
758 result = expand_heap_and_allocate(size, is_tlab); | |
759 if (result != NULL) { | |
760 return result; | |
761 } | |
762 | |
763 // If we reach this point, we're really out of memory. Try every trick | |
764 // we can to reclaim memory. Force collection of soft references. Force | |
765 // a complete compaction of the heap. Any additional methods for finding | |
766 // free memory should be here, especially if they are expensive. If this | |
767 // attempt fails, an OOM exception will be thrown. | |
768 { | |
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769 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
0 | 770 |
771 gch->do_collection(true /* full */, | |
772 true /* clear_all_soft_refs */, | |
773 size /* size */, | |
774 is_tlab /* is_tlab */, | |
775 number_of_generations() - 1 /* max_level */); | |
776 } | |
777 | |
778 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
779 if (result != NULL) { | |
780 assert(gch->is_in_reserved(result), "result not in heap"); | |
781 return result; | |
782 } | |
783 | |
1387
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784 assert(!should_clear_all_soft_refs(), |
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785 "Flag should have been handled and cleared prior to this point"); |
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786 |
0 | 787 // What else? We might try synchronous finalization later. If the total |
788 // space available is large enough for the allocation, then a more | |
789 // complete compaction phase than we've tried so far might be | |
790 // appropriate. | |
791 return NULL; | |
792 } | |
793 | |
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794 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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795 ClassLoaderData* loader_data, |
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796 size_t word_size, |
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797 Metaspace::MetadataType mdtype) { |
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798 uint loop_count = 0; |
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799 uint gc_count = 0; |
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800 uint full_gc_count = 0; |
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801 |
6923
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802 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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803 |
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804 do { |
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805 MetaWord* result = NULL; |
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806 if (GC_locker::is_active_and_needs_gc()) { |
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807 // If the GC_locker is active, just expand and allocate. |
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808 // If that does not succeed, wait if this thread is not |
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809 // in a critical section itself. |
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810 result = |
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811 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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812 mdtype); |
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813 if (result != NULL) { |
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814 return result; |
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815 } |
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816 JavaThread* jthr = JavaThread::current(); |
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817 if (!jthr->in_critical()) { |
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818 // Wait for JNI critical section to be exited |
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819 GC_locker::stall_until_clear(); |
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820 // The GC invoked by the last thread leaving the critical |
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821 // section will be a young collection and a full collection |
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822 // is (currently) needed for unloading classes so continue |
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823 // to the next iteration to get a full GC. |
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824 continue; |
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825 } else { |
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826 if (CheckJNICalls) { |
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827 fatal("Possible deadlock due to allocating while" |
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828 " in jni critical section"); |
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829 } |
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830 return NULL; |
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831 } |
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832 } |
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833 |
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834 { // Need lock to get self consistent gc_count's |
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835 MutexLocker ml(Heap_lock); |
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836 gc_count = Universe::heap()->total_collections(); |
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837 full_gc_count = Universe::heap()->total_full_collections(); |
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838 } |
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839 |
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840 // Generate a VM operation |
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841 VM_CollectForMetadataAllocation op(loader_data, |
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842 word_size, |
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843 mdtype, |
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844 gc_count, |
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845 full_gc_count, |
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846 GCCause::_metadata_GC_threshold); |
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847 VMThread::execute(&op); |
7446
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848 |
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849 // If GC was locked out, try again. Check |
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850 // before checking success because the prologue |
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851 // could have succeeded and the GC still have |
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852 // been locked out. |
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853 if (op.gc_locked()) { |
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854 continue; |
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855 } |
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856 |
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857 if (op.prologue_succeeded()) { |
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858 return op.result(); |
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859 } |
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860 loop_count++; |
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861 if ((QueuedAllocationWarningCount > 0) && |
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862 (loop_count % QueuedAllocationWarningCount == 0)) { |
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863 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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864 " size=%d", loop_count, word_size); |
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865 } |
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866 } while (true); // Until a GC is done |
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867 } |
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868 |
0 | 869 // Return true if any of the following is true: |
870 // . the allocation won't fit into the current young gen heap | |
871 // . gc locker is occupied (jni critical section) | |
872 // . heap memory is tight -- the most recent previous collection | |
873 // was a full collection because a partial collection (would | |
874 // have) failed and is likely to fail again | |
875 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
876 size_t word_size) const { | |
877 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
878 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
879 return (word_size > heap_word_size(gen0_capacity)) | |
1888
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880 || GC_locker::is_active_and_needs_gc() |
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881 || gch->incremental_collection_failed(); |
0 | 882 } |
883 | |
884 | |
885 // | |
886 // MarkSweepPolicy methods | |
887 // | |
888 | |
889 MarkSweepPolicy::MarkSweepPolicy() { | |
890 initialize_all(); | |
891 } | |
892 | |
893 void MarkSweepPolicy::initialize_generations() { | |
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894 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL); |
0 | 895 if (_generations == NULL) |
896 vm_exit_during_initialization("Unable to allocate gen spec"); | |
897 | |
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898 if (UseParNewGC) { |
0 | 899 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
900 } else { | |
901 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
902 } | |
903 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
904 | |
905 if (_generations[0] == NULL || _generations[1] == NULL) | |
906 vm_exit_during_initialization("Unable to allocate gen spec"); | |
907 } | |
908 | |
909 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
910 // initialize the policy counters - 2 collectors, 3 generations | |
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911 if (UseParNewGC) { |
0 | 912 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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|
913 } else { |
0 | 914 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
915 } | |
916 } |