Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 10183:868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
Reviewed-by: mgerdin, coleenp
author | jmasa |
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date | Tue, 12 Feb 2013 14:15:45 -0800 |
parents | 2e093b564241 |
children | 6f817ce50129 |
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 | |
50 void CollectorPolicy::initialize_flags() { | |
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51 if (MetaspaceSize > MaxMetaspaceSize) { |
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52 MaxMetaspaceSize = MetaspaceSize; |
0 | 53 } |
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54 MetaspaceSize = MAX2(min_alignment(), align_size_down_(MetaspaceSize, min_alignment())); |
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55 // Don't increase Metaspace size limit above specified. |
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56 MaxMetaspaceSize = align_size_down(MaxMetaspaceSize, max_alignment()); |
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57 if (MetaspaceSize > MaxMetaspaceSize) { |
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58 MetaspaceSize = MaxMetaspaceSize; |
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59 } |
0 | 60 |
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61 MinMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MinMetaspaceExpansion, min_alignment())); |
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62 MaxMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MaxMetaspaceExpansion, min_alignment())); |
0 | 63 |
64 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
65 | |
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66 assert(MetaspaceSize % min_alignment() == 0, "metapace alignment"); |
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67 assert(MaxMetaspaceSize % max_alignment() == 0, "maximum metaspace alignment"); |
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68 if (MetaspaceSize < 256*K) { |
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69 vm_exit_during_initialization("Too small initial Metaspace size"); |
0 | 70 } |
71 } | |
72 | |
73 void CollectorPolicy::initialize_size_info() { | |
74 // User inputs from -mx and ms are aligned | |
1064 | 75 set_initial_heap_byte_size(InitialHeapSize); |
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76 if (initial_heap_byte_size() == 0) { |
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77 set_initial_heap_byte_size(NewSize + OldSize); |
0 | 78 } |
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79 set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size, |
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80 min_alignment())); |
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81 |
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82 set_min_heap_byte_size(Arguments::min_heap_size()); |
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83 if (min_heap_byte_size() == 0) { |
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84 set_min_heap_byte_size(NewSize + OldSize); |
0 | 85 } |
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86 set_min_heap_byte_size(align_size_up(_min_heap_byte_size, |
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87 min_alignment())); |
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88 |
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89 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
0 | 90 |
91 // Check heap parameter properties | |
13
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92 if (initial_heap_byte_size() < M) { |
0 | 93 vm_exit_during_initialization("Too small initial heap"); |
94 } | |
95 // Check heap parameter properties | |
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96 if (min_heap_byte_size() < M) { |
0 | 97 vm_exit_during_initialization("Too small minimum heap"); |
98 } | |
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99 if (initial_heap_byte_size() <= NewSize) { |
0 | 100 // make sure there is at least some room in old space |
101 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
102 } | |
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103 if (max_heap_byte_size() < min_heap_byte_size()) { |
0 | 104 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
105 } | |
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106 if (initial_heap_byte_size() < min_heap_byte_size()) { |
0 | 107 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
108 } | |
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109 if (max_heap_byte_size() < initial_heap_byte_size()) { |
0 | 110 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
111 } | |
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112 |
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113 if (PrintGCDetails && Verbose) { |
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114 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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115 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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116 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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117 } |
0 | 118 } |
119 | |
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120 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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121 bool result = _should_clear_all_soft_refs; |
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122 set_should_clear_all_soft_refs(false); |
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123 return result; |
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124 } |
0 | 125 |
126 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
127 int max_covered_regions) { | |
128 switch (rem_set_name()) { | |
129 case GenRemSet::CardTable: { | |
130 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
131 return res; | |
132 } | |
133 default: | |
134 guarantee(false, "unrecognized GenRemSet::Name"); | |
135 return NULL; | |
136 } | |
137 } | |
138 | |
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139 void CollectorPolicy::cleared_all_soft_refs() { |
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140 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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141 // have been cleared in the last collection but if the gc overhear |
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142 // limit continues to be near, SoftRefs should still be cleared. |
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143 if (size_policy() != NULL) { |
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144 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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145 } |
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146 _all_soft_refs_clear = true; |
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147 } |
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148 |
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149 |
0 | 150 // GenCollectorPolicy methods. |
151 | |
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152 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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153 size_t x = base_size / (NewRatio+1); |
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154 size_t new_gen_size = x > min_alignment() ? |
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155 align_size_down(x, min_alignment()) : |
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156 min_alignment(); |
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157 return new_gen_size; |
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158 } |
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159 |
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160 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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161 size_t maximum_size) { |
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162 size_t alignment = min_alignment(); |
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163 size_t max_minus = maximum_size - alignment; |
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164 return desired_size < max_minus ? desired_size : max_minus; |
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165 } |
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166 |
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167 |
0 | 168 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
169 size_t init_promo_size, | |
170 size_t init_survivor_size) { | |
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171 const double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; |
0 | 172 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
173 init_promo_size, | |
174 init_survivor_size, | |
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175 max_gc_pause_sec, |
0 | 176 GCTimeRatio); |
177 } | |
178 | |
179 size_t GenCollectorPolicy::compute_max_alignment() { | |
180 // The card marking array and the offset arrays for old generations are | |
181 // committed in os pages as well. Make sure they are entirely full (to | |
182 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
183 // byte entry and the os page size is 4096, the maximum heap size should | |
184 // be 512*4096 = 2MB aligned. | |
185 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
186 | |
187 // Parallel GC does its own alignment of the generations to avoid requiring a | |
188 // large page (256M on some platforms) for the permanent generation. The | |
189 // other collectors should also be updated to do their own alignment and then | |
190 // this use of lcm() should be removed. | |
191 if (UseLargePages && !UseParallelGC) { | |
192 // in presence of large pages we have to make sure that our | |
193 // alignment is large page aware | |
194 alignment = lcm(os::large_page_size(), alignment); | |
195 } | |
196 | |
197 return alignment; | |
198 } | |
199 | |
200 void GenCollectorPolicy::initialize_flags() { | |
201 // All sizes must be multiples of the generation granularity. | |
202 set_min_alignment((uintx) Generation::GenGrain); | |
203 set_max_alignment(compute_max_alignment()); | |
204 assert(max_alignment() >= min_alignment() && | |
205 max_alignment() % min_alignment() == 0, | |
206 "invalid alignment constraints"); | |
207 | |
208 CollectorPolicy::initialize_flags(); | |
209 | |
210 // All generational heaps have a youngest gen; handle those flags here. | |
211 | |
212 // Adjust max size parameters | |
213 if (NewSize > MaxNewSize) { | |
214 MaxNewSize = NewSize; | |
215 } | |
216 NewSize = align_size_down(NewSize, min_alignment()); | |
217 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
218 | |
219 // Check validity of heap flags | |
220 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
221 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
222 | |
223 if (NewSize < 3*min_alignment()) { | |
224 // make sure there room for eden and two survivor spaces | |
225 vm_exit_during_initialization("Too small new size specified"); | |
226 } | |
227 if (SurvivorRatio < 1 || NewRatio < 1) { | |
228 vm_exit_during_initialization("Invalid heap ratio specified"); | |
229 } | |
230 } | |
231 | |
232 void TwoGenerationCollectorPolicy::initialize_flags() { | |
233 GenCollectorPolicy::initialize_flags(); | |
234 | |
235 OldSize = align_size_down(OldSize, min_alignment()); | |
236 if (NewSize + OldSize > MaxHeapSize) { | |
237 MaxHeapSize = NewSize + OldSize; | |
238 } | |
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239 |
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240 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(NewSize)) { |
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241 // NewRatio will be used later to set the young generation size so we use |
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242 // it to calculate how big the heap should be based on the requested OldSize |
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243 // and NewRatio. |
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244 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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245 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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246 |
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247 calculated_heapsize = align_size_up(calculated_heapsize, max_alignment()); |
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248 MaxHeapSize = calculated_heapsize; |
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249 InitialHeapSize = calculated_heapsize; |
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250 } |
0 | 251 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
252 | |
253 always_do_update_barrier = UseConcMarkSweepGC; | |
254 | |
255 // Check validity of heap flags | |
256 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
257 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
258 } | |
259 | |
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260 // Values set on the command line win over any ergonomically |
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261 // set command line parameters. |
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262 // Ergonomic choice of parameters are done before this |
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263 // method is called. Values for command line parameters such as NewSize |
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264 // and MaxNewSize feed those ergonomic choices into this method. |
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265 // This method makes the final generation sizings consistent with |
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266 // themselves and with overall heap sizings. |
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267 // In the absence of explicitly set command line flags, policies |
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268 // such as the use of NewRatio are used to size the generation. |
0 | 269 void GenCollectorPolicy::initialize_size_info() { |
270 CollectorPolicy::initialize_size_info(); | |
271 | |
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272 // min_alignment() is used for alignment within a generation. |
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273 // There is additional alignment done down stream for some |
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274 // collectors that sometimes causes unwanted rounding up of |
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275 // generations sizes. |
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276 |
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277 // Determine maximum size of gen0 |
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278 |
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279 size_t max_new_size = 0; |
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280 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) { |
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281 if (MaxNewSize < min_alignment()) { |
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282 max_new_size = min_alignment(); |
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283 } |
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284 if (MaxNewSize >= max_heap_byte_size()) { |
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285 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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286 min_alignment()); |
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287 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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288 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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289 "new generation size of " SIZE_FORMAT "k will be used.", |
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290 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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291 } else { |
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292 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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293 } |
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294 |
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295 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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296 // specially at this point to just use an ergonomically set |
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297 // MaxNewSize to set max_new_size. For cases with small |
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298 // heaps such a policy often did not work because the MaxNewSize |
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299 // was larger than the entire heap. The interpretation given |
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300 // to ergonomically set flags is that the flags are set |
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301 // by different collectors for their own special needs but |
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302 // are not allowed to badly shape the heap. This allows the |
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303 // different collectors to decide what's best for themselves |
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304 // without having to factor in the overall heap shape. It |
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305 // can be the case in the future that the collectors would |
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306 // only make "wise" ergonomics choices and this policy could |
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307 // just accept those choices. The choices currently made are |
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308 // not always "wise". |
0 | 309 } else { |
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310 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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311 // Bound the maximum size by NewSize below (since it historically |
0 | 312 // would have been NewSize and because the NewRatio calculation could |
313 // yield a size that is too small) and bound it by MaxNewSize above. | |
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314 // Ergonomics plays here by previously calculating the desired |
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315 // NewSize and MaxNewSize. |
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316 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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317 } |
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318 assert(max_new_size > 0, "All paths should set max_new_size"); |
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319 |
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320 // Given the maximum gen0 size, determine the initial and |
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321 // minimum gen0 sizes. |
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322 |
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323 if (max_heap_byte_size() == min_heap_byte_size()) { |
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324 // The maximum and minimum heap sizes are the same so |
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325 // the generations minimum and initial must be the |
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326 // same as its maximum. |
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327 set_min_gen0_size(max_new_size); |
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328 set_initial_gen0_size(max_new_size); |
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329 set_max_gen0_size(max_new_size); |
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330 } else { |
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331 size_t desired_new_size = 0; |
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332 if (!FLAG_IS_DEFAULT(NewSize)) { |
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333 // If NewSize is set ergonomically (for example by cms), it |
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334 // would make sense to use it. If it is used, also use it |
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335 // to set the initial size. Although there is no reason |
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336 // the minimum size and the initial size have to be the same, |
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337 // the current implementation gets into trouble during the calculation |
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338 // of the tenured generation sizes if they are different. |
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339 // Note that this makes the initial size and the minimum size |
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340 // generally small compared to the NewRatio calculation. |
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341 _min_gen0_size = NewSize; |
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342 desired_new_size = NewSize; |
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343 max_new_size = MAX2(max_new_size, NewSize); |
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344 } else { |
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345 // For the case where NewSize is the default, use NewRatio |
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346 // to size the minimum and initial generation sizes. |
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347 // Use the default NewSize as the floor for these values. If |
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348 // NewRatio is overly large, the resulting sizes can be too |
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349 // small. |
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350 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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351 NewSize); |
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352 desired_new_size = |
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353 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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354 NewSize); |
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355 } |
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356 |
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357 assert(_min_gen0_size > 0, "Sanity check"); |
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358 set_initial_gen0_size(desired_new_size); |
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359 set_max_gen0_size(max_new_size); |
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360 |
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361 // At this point the desirable initial and minimum sizes have been |
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362 // determined without regard to the maximum sizes. |
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363 |
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364 // Bound the sizes by the corresponding overall heap sizes. |
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365 set_min_gen0_size( |
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366 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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367 set_initial_gen0_size( |
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368 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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369 set_max_gen0_size( |
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370 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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371 |
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372 // At this point all three sizes have been checked against the |
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373 // maximum sizes but have not been checked for consistency |
342
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374 // among the three. |
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375 |
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376 // Final check min <= initial <= max |
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377 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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378 set_initial_gen0_size( |
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379 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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380 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 381 } |
382 | |
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383 if (PrintGCDetails && Verbose) { |
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384 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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385 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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386 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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387 } |
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388 } |
0 | 389 |
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390 // Call this method during the sizing of the gen1 to make |
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391 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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392 // the most freedom in sizing because it is done before the |
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393 // policy for gen1 is applied. Once gen1 policies have been applied, |
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394 // there may be conflicts in the shape of the heap and this method |
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395 // is used to make the needed adjustments. The application of the |
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396 // policies could be more sophisticated (iterative for example) but |
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397 // keeping it simple also seems a worthwhile goal. |
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398 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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399 size_t* gen1_size_ptr, |
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400 const size_t heap_size, |
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401 const size_t min_gen1_size) { |
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402 bool result = false; |
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403 |
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404 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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405 if ((heap_size < (*gen0_size_ptr + min_gen1_size)) && |
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406 (heap_size >= min_gen1_size + min_alignment())) { |
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407 // Adjust gen0 down to accommodate min_gen1_size |
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408 *gen0_size_ptr = heap_size - min_gen1_size; |
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409 *gen0_size_ptr = |
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410 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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411 min_alignment()); |
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412 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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413 result = true; |
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414 } else { |
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415 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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416 *gen1_size_ptr = |
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417 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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418 min_alignment()); |
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419 } |
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420 } |
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421 return result; |
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422 } |
0 | 423 |
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424 // Minimum sizes of the generations may be different than |
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425 // the initial sizes. An inconsistently is permitted here |
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426 // in the total size that can be specified explicitly by |
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427 // command line specification of OldSize and NewSize and |
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428 // also a command line specification of -Xms. Issue a warning |
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429 // but allow the values to pass. |
0 | 430 |
431 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
432 GenCollectorPolicy::initialize_size_info(); | |
433 | |
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434 // At this point the minimum, initial and maximum sizes |
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435 // of the overall heap and of gen0 have been determined. |
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436 // The maximum gen1 size can be determined from the maximum gen0 |
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437 // and maximum heap size since no explicit flags exits |
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438 // for setting the gen1 maximum. |
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439 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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440 _max_gen1_size = |
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441 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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442 min_alignment()); |
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443 // If no explicit command line flag has been set for the |
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444 // gen1 size, use what is left for gen1. |
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445 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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446 // The user has not specified any value or ergonomics |
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447 // has chosen a value (which may or may not be consistent |
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448 // with the overall heap size). In either case make |
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449 // the minimum, maximum and initial sizes consistent |
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450 // with the gen0 sizes and the overall heap sizes. |
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451 assert(min_heap_byte_size() > _min_gen0_size, |
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452 "gen0 has an unexpected minimum size"); |
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453 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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454 set_min_gen1_size( |
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455 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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456 min_alignment())); |
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457 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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458 set_initial_gen1_size( |
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459 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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460 min_alignment())); |
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461 |
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462 } else { |
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463 // It's been explicitly set on the command line. Use the |
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464 // OldSize and then determine the consequences. |
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465 set_min_gen1_size(OldSize); |
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466 set_initial_gen1_size(OldSize); |
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467 |
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468 // If the user has explicitly set an OldSize that is inconsistent |
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469 // with other command line flags, issue a warning. |
0 | 470 // The generation minimums and the overall heap mimimum should |
471 // be within one heap alignment. | |
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472 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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473 min_heap_byte_size()) { |
0 | 474 warning("Inconsistency between minimum heap size and minimum " |
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475 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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476 min_heap_byte_size()); |
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477 } |
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478 if ((OldSize > _max_gen1_size)) { |
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479 warning("Inconsistency between maximum heap size and maximum " |
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480 "generation sizes: using maximum heap = " SIZE_FORMAT |
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481 " -XX:OldSize flag is being ignored", |
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482 max_heap_byte_size()); |
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483 } |
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484 // If there is an inconsistency between the OldSize and the minimum and/or |
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485 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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486 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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487 min_heap_byte_size(), OldSize)) { |
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488 if (PrintGCDetails && Verbose) { |
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489 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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490 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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491 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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492 } |
0 | 493 } |
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494 // Initial size |
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495 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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496 initial_heap_byte_size(), OldSize)) { |
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497 if (PrintGCDetails && Verbose) { |
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498 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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499 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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500 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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501 } |
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502 } |
0 | 503 } |
13
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504 // Enforce the maximum gen1 size. |
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505 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 506 |
13
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507 // Check that min gen1 <= initial gen1 <= max gen1 |
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508 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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509 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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510 |
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511 if (PrintGCDetails && Verbose) { |
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512 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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513 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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514 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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515 } |
0 | 516 } |
517 | |
518 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
519 bool is_tlab, | |
520 bool* gc_overhead_limit_was_exceeded) { | |
521 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
522 | |
523 debug_only(gch->check_for_valid_allocation_state()); | |
524 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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525 |
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526 // In general gc_overhead_limit_was_exceeded should be false so |
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527 // set it so here and reset it to true only if the gc time |
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528 // limit is being exceeded as checked below. |
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529 *gc_overhead_limit_was_exceeded = false; |
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530 |
0 | 531 HeapWord* result = NULL; |
532 | |
533 // Loop until the allocation is satisified, | |
534 // or unsatisfied after GC. | |
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535 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
0 | 536 HandleMark hm; // discard any handles allocated in each iteration |
537 | |
538 // First allocation attempt is lock-free. | |
539 Generation *gen0 = gch->get_gen(0); | |
540 assert(gen0->supports_inline_contig_alloc(), | |
541 "Otherwise, must do alloc within heap lock"); | |
542 if (gen0->should_allocate(size, is_tlab)) { | |
543 result = gen0->par_allocate(size, is_tlab); | |
544 if (result != NULL) { | |
545 assert(gch->is_in_reserved(result), "result not in heap"); | |
546 return result; | |
547 } | |
548 } | |
549 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
550 { | |
551 MutexLocker ml(Heap_lock); | |
552 if (PrintGC && Verbose) { | |
553 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
554 " attempting locked slow path allocation"); | |
555 } | |
556 // Note that only large objects get a shot at being | |
557 // allocated in later generations. | |
558 bool first_only = ! should_try_older_generation_allocation(size); | |
559 | |
560 result = gch->attempt_allocation(size, is_tlab, first_only); | |
561 if (result != NULL) { | |
562 assert(gch->is_in_reserved(result), "result not in heap"); | |
563 return result; | |
564 } | |
565 | |
566 if (GC_locker::is_active_and_needs_gc()) { | |
567 if (is_tlab) { | |
568 return NULL; // Caller will retry allocating individual object | |
569 } | |
570 if (!gch->is_maximal_no_gc()) { | |
571 // Try and expand heap to satisfy request | |
572 result = expand_heap_and_allocate(size, is_tlab); | |
573 // result could be null if we are out of space | |
574 if (result != NULL) { | |
575 return result; | |
576 } | |
577 } | |
578 | |
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579 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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580 return NULL; // we didn't get to do a GC and we didn't get any memory |
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581 } |
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582 |
0 | 583 // If this thread is not in a jni critical section, we stall |
584 // the requestor until the critical section has cleared and | |
585 // GC allowed. When the critical section clears, a GC is | |
586 // initiated by the last thread exiting the critical section; so | |
587 // we retry the allocation sequence from the beginning of the loop, | |
588 // rather than causing more, now probably unnecessary, GC attempts. | |
589 JavaThread* jthr = JavaThread::current(); | |
590 if (!jthr->in_critical()) { | |
591 MutexUnlocker mul(Heap_lock); | |
592 // Wait for JNI critical section to be exited | |
593 GC_locker::stall_until_clear(); | |
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594 gclocker_stalled_count += 1; |
0 | 595 continue; |
596 } else { | |
597 if (CheckJNICalls) { | |
598 fatal("Possible deadlock due to allocating while" | |
599 " in jni critical section"); | |
600 } | |
601 return NULL; | |
602 } | |
603 } | |
604 | |
605 // Read the gc count while the heap lock is held. | |
606 gc_count_before = Universe::heap()->total_collections(); | |
607 } | |
608 | |
609 VM_GenCollectForAllocation op(size, | |
610 is_tlab, | |
611 gc_count_before); | |
612 VMThread::execute(&op); | |
613 if (op.prologue_succeeded()) { | |
614 result = op.result(); | |
615 if (op.gc_locked()) { | |
616 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
617 continue; // retry and/or stall as necessary | |
618 } | |
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619 |
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620 // Allocation has failed and a collection |
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621 // has been done. If the gc time limit was exceeded the |
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622 // this time, return NULL so that an out-of-memory |
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623 // will be thrown. Clear gc_overhead_limit_exceeded |
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624 // so that the overhead exceeded does not persist. |
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625 |
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626 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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627 const bool softrefs_clear = all_soft_refs_clear(); |
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628 |
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629 if (limit_exceeded && softrefs_clear) { |
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630 *gc_overhead_limit_was_exceeded = true; |
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631 size_policy()->set_gc_overhead_limit_exceeded(false); |
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632 if (op.result() != NULL) { |
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633 CollectedHeap::fill_with_object(op.result(), size); |
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634 } |
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635 return NULL; |
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636 } |
0 | 637 assert(result == NULL || gch->is_in_reserved(result), |
638 "result not in heap"); | |
639 return result; | |
640 } | |
641 | |
642 // Give a warning if we seem to be looping forever. | |
643 if ((QueuedAllocationWarningCount > 0) && | |
644 (try_count % QueuedAllocationWarningCount == 0)) { | |
645 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
646 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
647 } | |
648 } | |
649 } | |
650 | |
651 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
652 bool is_tlab) { | |
653 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
654 HeapWord* result = NULL; | |
655 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
656 Generation *gen = gch->get_gen(i); | |
657 if (gen->should_allocate(size, is_tlab)) { | |
658 result = gen->expand_and_allocate(size, is_tlab); | |
659 } | |
660 } | |
661 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
662 return result; | |
663 } | |
664 | |
665 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
666 bool is_tlab) { | |
667 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
668 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
669 HeapWord* result = NULL; | |
670 | |
671 assert(size != 0, "Precondition violated"); | |
672 if (GC_locker::is_active_and_needs_gc()) { | |
673 // GC locker is active; instead of a collection we will attempt | |
674 // to expand the heap, if there's room for expansion. | |
675 if (!gch->is_maximal_no_gc()) { | |
676 result = expand_heap_and_allocate(size, is_tlab); | |
677 } | |
678 return result; // could be null if we are out of space | |
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679 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 680 // Do an incremental collection. |
681 gch->do_collection(false /* full */, | |
682 false /* clear_all_soft_refs */, | |
683 size /* size */, | |
684 is_tlab /* is_tlab */, | |
685 number_of_generations() - 1 /* max_level */); | |
686 } else { | |
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687 if (Verbose && PrintGCDetails) { |
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688 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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|
689 } |
0 | 690 // Try a full collection; see delta for bug id 6266275 |
691 // for the original code and why this has been simplified | |
692 // with from-space allocation criteria modified and | |
693 // such allocation moved out of the safepoint path. | |
694 gch->do_collection(true /* full */, | |
695 false /* clear_all_soft_refs */, | |
696 size /* size */, | |
697 is_tlab /* is_tlab */, | |
698 number_of_generations() - 1 /* max_level */); | |
699 } | |
700 | |
701 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
702 | |
703 if (result != NULL) { | |
704 assert(gch->is_in_reserved(result), "result not in heap"); | |
705 return result; | |
706 } | |
707 | |
708 // OK, collection failed, try expansion. | |
709 result = expand_heap_and_allocate(size, is_tlab); | |
710 if (result != NULL) { | |
711 return result; | |
712 } | |
713 | |
714 // If we reach this point, we're really out of memory. Try every trick | |
715 // we can to reclaim memory. Force collection of soft references. Force | |
716 // a complete compaction of the heap. Any additional methods for finding | |
717 // free memory should be here, especially if they are expensive. If this | |
718 // attempt fails, an OOM exception will be thrown. | |
719 { | |
720 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
721 | |
722 gch->do_collection(true /* full */, | |
723 true /* clear_all_soft_refs */, | |
724 size /* size */, | |
725 is_tlab /* is_tlab */, | |
726 number_of_generations() - 1 /* max_level */); | |
727 } | |
728 | |
729 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
730 if (result != NULL) { | |
731 assert(gch->is_in_reserved(result), "result not in heap"); | |
732 return result; | |
733 } | |
734 | |
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735 assert(!should_clear_all_soft_refs(), |
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736 "Flag should have been handled and cleared prior to this point"); |
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737 |
0 | 738 // What else? We might try synchronous finalization later. If the total |
739 // space available is large enough for the allocation, then a more | |
740 // complete compaction phase than we've tried so far might be | |
741 // appropriate. | |
742 return NULL; | |
743 } | |
744 | |
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745 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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746 ClassLoaderData* loader_data, |
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747 size_t word_size, |
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748 Metaspace::MetadataType mdtype) { |
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749 uint loop_count = 0; |
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750 uint gc_count = 0; |
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751 uint full_gc_count = 0; |
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752 |
6923
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753 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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754 |
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755 do { |
6753
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756 MetaWord* result = NULL; |
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757 if (GC_locker::is_active_and_needs_gc()) { |
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758 // If the GC_locker is active, just expand and allocate. |
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759 // If that does not succeed, wait if this thread is not |
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760 // in a critical section itself. |
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761 result = |
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762 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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763 mdtype); |
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764 if (result != NULL) { |
8da5e203b993
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765 return result; |
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|
766 } |
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767 JavaThread* jthr = JavaThread::current(); |
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768 if (!jthr->in_critical()) { |
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769 // Wait for JNI critical section to be exited |
8da5e203b993
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770 GC_locker::stall_until_clear(); |
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771 // The GC invoked by the last thread leaving the critical |
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772 // section will be a young collection and a full collection |
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773 // is (currently) needed for unloading classes so continue |
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774 // to the next iteration to get a full GC. |
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775 continue; |
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776 } else { |
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777 if (CheckJNICalls) { |
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778 fatal("Possible deadlock due to allocating while" |
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779 " in jni critical section"); |
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780 } |
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781 return NULL; |
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782 } |
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783 } |
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784 |
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785 { // Need lock to get self consistent gc_count's |
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786 MutexLocker ml(Heap_lock); |
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787 gc_count = Universe::heap()->total_collections(); |
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788 full_gc_count = Universe::heap()->total_full_collections(); |
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789 } |
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790 |
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791 // Generate a VM operation |
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792 VM_CollectForMetadataAllocation op(loader_data, |
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793 word_size, |
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794 mdtype, |
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795 gc_count, |
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796 full_gc_count, |
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797 GCCause::_metadata_GC_threshold); |
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798 VMThread::execute(&op); |
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799 |
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800 // If GC was locked out, try again. Check |
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801 // before checking success because the prologue |
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802 // could have succeeded and the GC still have |
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803 // been locked out. |
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804 if (op.gc_locked()) { |
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805 continue; |
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806 } |
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807 |
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808 if (op.prologue_succeeded()) { |
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809 return op.result(); |
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810 } |
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811 loop_count++; |
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812 if ((QueuedAllocationWarningCount > 0) && |
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813 (loop_count % QueuedAllocationWarningCount == 0)) { |
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814 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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815 " size=%d", loop_count, word_size); |
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816 } |
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817 } while (true); // Until a GC is done |
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818 } |
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819 |
0 | 820 // Return true if any of the following is true: |
821 // . the allocation won't fit into the current young gen heap | |
822 // . gc locker is occupied (jni critical section) | |
823 // . heap memory is tight -- the most recent previous collection | |
824 // was a full collection because a partial collection (would | |
825 // have) failed and is likely to fail again | |
826 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
827 size_t word_size) const { | |
828 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
829 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
830 return (word_size > heap_word_size(gen0_capacity)) | |
1888
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831 || GC_locker::is_active_and_needs_gc() |
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832 || gch->incremental_collection_failed(); |
0 | 833 } |
834 | |
835 | |
836 // | |
837 // MarkSweepPolicy methods | |
838 // | |
839 | |
840 MarkSweepPolicy::MarkSweepPolicy() { | |
841 initialize_all(); | |
842 } | |
843 | |
844 void MarkSweepPolicy::initialize_generations() { | |
845 _generations = new GenerationSpecPtr[number_of_generations()]; | |
846 if (_generations == NULL) | |
847 vm_exit_during_initialization("Unable to allocate gen spec"); | |
848 | |
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849 if (UseParNewGC) { |
0 | 850 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
851 } else { | |
852 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
853 } | |
854 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
855 | |
856 if (_generations[0] == NULL || _generations[1] == NULL) | |
857 vm_exit_during_initialization("Unable to allocate gen spec"); | |
858 } | |
859 | |
860 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
861 // initialize the policy counters - 2 collectors, 3 generations | |
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862 if (UseParNewGC) { |
0 | 863 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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864 } else { |
0 | 865 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
866 } | |
867 } |