Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 11516:20b642493616
CR-1368
author | Mick Jordan <mick.jordan@oracle.com> |
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date | Tue, 03 Sep 2013 14:09:35 -0700 |
parents | 2958af1d8c5a |
children | 4c84d351cca9 |
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 assert(max_alignment() >= min_alignment(), |
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52 err_msg("max_alignment: " SIZE_FORMAT " less than min_alignment: " SIZE_FORMAT, |
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53 max_alignment(), min_alignment())); |
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54 assert(max_alignment() % min_alignment() == 0, |
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55 err_msg("max_alignment: " SIZE_FORMAT " not aligned by min_alignment: " SIZE_FORMAT, |
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56 max_alignment(), min_alignment())); |
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57 |
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58 if (MaxHeapSize < InitialHeapSize) { |
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59 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
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60 } |
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61 |
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62 if (MetaspaceSize > MaxMetaspaceSize) { |
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63 MaxMetaspaceSize = MetaspaceSize; |
0 | 64 } |
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65 MetaspaceSize = MAX2(min_alignment(), align_size_down_(MetaspaceSize, min_alignment())); |
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66 // Don't increase Metaspace size limit above specified. |
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67 MaxMetaspaceSize = align_size_down(MaxMetaspaceSize, max_alignment()); |
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68 if (MetaspaceSize > MaxMetaspaceSize) { |
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69 MetaspaceSize = MaxMetaspaceSize; |
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70 } |
0 | 71 |
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72 MinMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MinMetaspaceExpansion, min_alignment())); |
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73 MaxMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MaxMetaspaceExpansion, min_alignment())); |
0 | 74 |
75 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
76 | |
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77 assert(MetaspaceSize % min_alignment() == 0, "metapace alignment"); |
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78 assert(MaxMetaspaceSize % max_alignment() == 0, "maximum metaspace alignment"); |
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79 if (MetaspaceSize < 256*K) { |
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80 vm_exit_during_initialization("Too small initial Metaspace size"); |
0 | 81 } |
82 } | |
83 | |
84 void CollectorPolicy::initialize_size_info() { | |
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85 // User inputs from -mx and ms must be aligned |
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86 set_min_heap_byte_size(align_size_up(Arguments::min_heap_size(), min_alignment())); |
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87 set_initial_heap_byte_size(align_size_up(InitialHeapSize, min_alignment())); |
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88 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
0 | 89 |
90 // Check heap parameter properties | |
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91 if (initial_heap_byte_size() < M) { |
0 | 92 vm_exit_during_initialization("Too small initial heap"); |
93 } | |
94 // Check heap parameter properties | |
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95 if (min_heap_byte_size() < M) { |
0 | 96 vm_exit_during_initialization("Too small minimum heap"); |
97 } | |
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98 if (initial_heap_byte_size() <= NewSize) { |
0 | 99 // make sure there is at least some room in old space |
100 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
101 } | |
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102 if (max_heap_byte_size() < min_heap_byte_size()) { |
0 | 103 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
104 } | |
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105 if (initial_heap_byte_size() < min_heap_byte_size()) { |
0 | 106 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
107 } | |
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108 if (max_heap_byte_size() < initial_heap_byte_size()) { |
0 | 109 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
110 } | |
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111 |
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112 if (PrintGCDetails && Verbose) { |
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113 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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114 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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115 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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116 } |
0 | 117 } |
118 | |
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119 bool CollectorPolicy::use_should_clear_all_soft_refs(bool v) { |
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120 bool result = _should_clear_all_soft_refs; |
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121 set_should_clear_all_soft_refs(false); |
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122 return result; |
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123 } |
0 | 124 |
125 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
126 int max_covered_regions) { | |
127 switch (rem_set_name()) { | |
128 case GenRemSet::CardTable: { | |
129 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
130 return res; | |
131 } | |
132 default: | |
133 guarantee(false, "unrecognized GenRemSet::Name"); | |
134 return NULL; | |
135 } | |
136 } | |
137 | |
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138 void CollectorPolicy::cleared_all_soft_refs() { |
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139 // If near gc overhear limit, continue to clear SoftRefs. SoftRefs may |
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140 // have been cleared in the last collection but if the gc overhear |
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141 // limit continues to be near, SoftRefs should still be cleared. |
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142 if (size_policy() != NULL) { |
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143 _should_clear_all_soft_refs = size_policy()->gc_overhead_limit_near(); |
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144 } |
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145 _all_soft_refs_clear = true; |
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146 } |
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147 |
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148 |
0 | 149 // GenCollectorPolicy methods. |
150 | |
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151 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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152 size_t x = base_size / (NewRatio+1); |
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153 size_t new_gen_size = x > min_alignment() ? |
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154 align_size_down(x, min_alignment()) : |
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155 min_alignment(); |
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156 return new_gen_size; |
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157 } |
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158 |
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159 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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160 size_t maximum_size) { |
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161 size_t alignment = min_alignment(); |
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162 size_t max_minus = maximum_size - alignment; |
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163 return desired_size < max_minus ? desired_size : max_minus; |
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164 } |
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165 |
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166 |
0 | 167 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
168 size_t init_promo_size, | |
169 size_t init_survivor_size) { | |
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170 const double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; |
0 | 171 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
172 init_promo_size, | |
173 init_survivor_size, | |
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174 max_gc_pause_sec, |
0 | 175 GCTimeRatio); |
176 } | |
177 | |
178 size_t GenCollectorPolicy::compute_max_alignment() { | |
179 // The card marking array and the offset arrays for old generations are | |
180 // committed in os pages as well. Make sure they are entirely full (to | |
181 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
182 // byte entry and the os page size is 4096, the maximum heap size should | |
183 // be 512*4096 = 2MB aligned. | |
184 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
185 | |
186 // Parallel GC does its own alignment of the generations to avoid requiring a | |
187 // large page (256M on some platforms) for the permanent generation. The | |
188 // other collectors should also be updated to do their own alignment and then | |
189 // this use of lcm() should be removed. | |
190 if (UseLargePages && !UseParallelGC) { | |
191 // in presence of large pages we have to make sure that our | |
192 // alignment is large page aware | |
193 alignment = lcm(os::large_page_size(), alignment); | |
194 } | |
195 | |
196 return alignment; | |
197 } | |
198 | |
199 void GenCollectorPolicy::initialize_flags() { | |
200 // All sizes must be multiples of the generation granularity. | |
201 set_min_alignment((uintx) Generation::GenGrain); | |
202 set_max_alignment(compute_max_alignment()); | |
203 | |
204 CollectorPolicy::initialize_flags(); | |
205 | |
206 // All generational heaps have a youngest gen; handle those flags here. | |
207 | |
208 // Adjust max size parameters | |
209 if (NewSize > MaxNewSize) { | |
210 MaxNewSize = NewSize; | |
211 } | |
212 NewSize = align_size_down(NewSize, min_alignment()); | |
213 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
214 | |
215 // Check validity of heap flags | |
216 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
217 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
218 | |
219 if (NewSize < 3*min_alignment()) { | |
220 // make sure there room for eden and two survivor spaces | |
221 vm_exit_during_initialization("Too small new size specified"); | |
222 } | |
223 if (SurvivorRatio < 1 || NewRatio < 1) { | |
224 vm_exit_during_initialization("Invalid heap ratio specified"); | |
225 } | |
226 } | |
227 | |
228 void TwoGenerationCollectorPolicy::initialize_flags() { | |
229 GenCollectorPolicy::initialize_flags(); | |
230 | |
231 OldSize = align_size_down(OldSize, min_alignment()); | |
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232 |
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233 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(NewSize)) { |
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234 // NewRatio will be used later to set the young generation size so we use |
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235 // it to calculate how big the heap should be based on the requested OldSize |
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236 // and NewRatio. |
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237 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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238 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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239 |
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240 calculated_heapsize = align_size_up(calculated_heapsize, max_alignment()); |
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241 MaxHeapSize = calculated_heapsize; |
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242 InitialHeapSize = calculated_heapsize; |
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243 } |
0 | 244 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
245 | |
10241
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246 // adjust max heap size if necessary |
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247 if (NewSize + OldSize > MaxHeapSize) { |
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248 if (FLAG_IS_CMDLINE(MaxHeapSize)) { |
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249 // somebody set a maximum heap size with the intention that we should not |
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250 // exceed it. Adjust New/OldSize as necessary. |
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251 uintx calculated_size = NewSize + OldSize; |
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252 double shrink_factor = (double) MaxHeapSize / calculated_size; |
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253 // align |
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254 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); |
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255 // OldSize is already aligned because above we aligned MaxHeapSize to |
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256 // max_alignment(), and we just made sure that NewSize is aligned to |
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257 // min_alignment(). In initialize_flags() we verified that max_alignment() |
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258 // is a multiple of min_alignment(). |
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259 OldSize = MaxHeapSize - NewSize; |
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260 } else { |
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261 MaxHeapSize = NewSize + OldSize; |
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262 } |
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263 } |
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264 // need to do this again |
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265 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
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266 |
10284 | 267 // adjust max heap size if necessary |
268 if (NewSize + OldSize > MaxHeapSize) { | |
269 if (FLAG_IS_CMDLINE(MaxHeapSize)) { | |
270 // somebody set a maximum heap size with the intention that we should not | |
271 // exceed it. Adjust New/OldSize as necessary. | |
272 uintx calculated_size = NewSize + OldSize; | |
273 double shrink_factor = (double) MaxHeapSize / calculated_size; | |
274 // align | |
275 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); | |
276 // OldSize is already aligned because above we aligned MaxHeapSize to | |
277 // max_alignment(), and we just made sure that NewSize is aligned to | |
278 // min_alignment(). In initialize_flags() we verified that max_alignment() | |
279 // is a multiple of min_alignment(). | |
280 OldSize = MaxHeapSize - NewSize; | |
281 } else { | |
282 MaxHeapSize = NewSize + OldSize; | |
283 } | |
284 } | |
285 // need to do this again | |
286 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
287 | |
0 | 288 always_do_update_barrier = UseConcMarkSweepGC; |
289 | |
290 // Check validity of heap flags | |
291 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
292 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
293 } | |
294 | |
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295 // Values set on the command line win over any ergonomically |
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296 // set command line parameters. |
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297 // Ergonomic choice of parameters are done before this |
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298 // method is called. Values for command line parameters such as NewSize |
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299 // and MaxNewSize feed those ergonomic choices into this method. |
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300 // This method makes the final generation sizings consistent with |
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301 // themselves and with overall heap sizings. |
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302 // In the absence of explicitly set command line flags, policies |
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303 // such as the use of NewRatio are used to size the generation. |
0 | 304 void GenCollectorPolicy::initialize_size_info() { |
305 CollectorPolicy::initialize_size_info(); | |
306 | |
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307 // min_alignment() is used for alignment within a generation. |
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308 // There is additional alignment done down stream for some |
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309 // collectors that sometimes causes unwanted rounding up of |
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310 // generations sizes. |
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311 |
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312 // Determine maximum size of gen0 |
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313 |
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314 size_t max_new_size = 0; |
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315 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) { |
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316 if (MaxNewSize < min_alignment()) { |
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317 max_new_size = min_alignment(); |
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318 } |
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319 if (MaxNewSize >= max_heap_byte_size()) { |
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320 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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321 min_alignment()); |
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322 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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323 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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324 "new generation size of " SIZE_FORMAT "k will be used.", |
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325 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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326 } else { |
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327 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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328 } |
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329 |
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330 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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331 // specially at this point to just use an ergonomically set |
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332 // MaxNewSize to set max_new_size. For cases with small |
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333 // heaps such a policy often did not work because the MaxNewSize |
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334 // was larger than the entire heap. The interpretation given |
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335 // to ergonomically set flags is that the flags are set |
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336 // by different collectors for their own special needs but |
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337 // are not allowed to badly shape the heap. This allows the |
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338 // different collectors to decide what's best for themselves |
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339 // without having to factor in the overall heap shape. It |
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340 // can be the case in the future that the collectors would |
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341 // only make "wise" ergonomics choices and this policy could |
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342 // just accept those choices. The choices currently made are |
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343 // not always "wise". |
0 | 344 } else { |
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345 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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346 // Bound the maximum size by NewSize below (since it historically |
0 | 347 // would have been NewSize and because the NewRatio calculation could |
348 // yield a size that is too small) and bound it by MaxNewSize above. | |
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349 // Ergonomics plays here by previously calculating the desired |
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350 // NewSize and MaxNewSize. |
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351 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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352 } |
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353 assert(max_new_size > 0, "All paths should set max_new_size"); |
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354 |
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355 // Given the maximum gen0 size, determine the initial and |
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356 // minimum gen0 sizes. |
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357 |
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358 if (max_heap_byte_size() == min_heap_byte_size()) { |
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359 // The maximum and minimum heap sizes are the same so |
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360 // the generations minimum and initial must be the |
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361 // same as its maximum. |
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362 set_min_gen0_size(max_new_size); |
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363 set_initial_gen0_size(max_new_size); |
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364 set_max_gen0_size(max_new_size); |
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365 } else { |
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366 size_t desired_new_size = 0; |
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367 if (!FLAG_IS_DEFAULT(NewSize)) { |
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368 // If NewSize is set ergonomically (for example by cms), it |
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369 // would make sense to use it. If it is used, also use it |
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370 // to set the initial size. Although there is no reason |
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371 // the minimum size and the initial size have to be the same, |
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372 // the current implementation gets into trouble during the calculation |
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373 // of the tenured generation sizes if they are different. |
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374 // Note that this makes the initial size and the minimum size |
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375 // generally small compared to the NewRatio calculation. |
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376 _min_gen0_size = NewSize; |
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377 desired_new_size = NewSize; |
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378 max_new_size = MAX2(max_new_size, NewSize); |
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379 } else { |
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380 // For the case where NewSize is the default, use NewRatio |
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381 // to size the minimum and initial generation sizes. |
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382 // Use the default NewSize as the floor for these values. If |
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383 // NewRatio is overly large, the resulting sizes can be too |
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384 // small. |
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385 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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386 NewSize); |
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387 desired_new_size = |
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388 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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389 NewSize); |
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390 } |
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391 |
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392 assert(_min_gen0_size > 0, "Sanity check"); |
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393 set_initial_gen0_size(desired_new_size); |
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394 set_max_gen0_size(max_new_size); |
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395 |
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396 // At this point the desirable initial and minimum sizes have been |
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397 // determined without regard to the maximum sizes. |
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398 |
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399 // Bound the sizes by the corresponding overall heap sizes. |
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400 set_min_gen0_size( |
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401 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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402 set_initial_gen0_size( |
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403 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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404 set_max_gen0_size( |
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405 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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406 |
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407 // At this point all three sizes have been checked against the |
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408 // maximum sizes but have not been checked for consistency |
342
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409 // among the three. |
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410 |
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411 // Final check min <= initial <= max |
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412 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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413 set_initial_gen0_size( |
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414 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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415 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 416 } |
417 | |
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418 if (PrintGCDetails && Verbose) { |
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419 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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420 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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421 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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422 } |
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423 } |
0 | 424 |
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425 // Call this method during the sizing of the gen1 to make |
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426 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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427 // the most freedom in sizing because it is done before the |
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428 // policy for gen1 is applied. Once gen1 policies have been applied, |
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429 // there may be conflicts in the shape of the heap and this method |
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430 // is used to make the needed adjustments. The application of the |
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431 // policies could be more sophisticated (iterative for example) but |
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432 // keeping it simple also seems a worthwhile goal. |
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433 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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434 size_t* gen1_size_ptr, |
8013
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435 const size_t heap_size, |
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436 const size_t min_gen1_size) { |
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437 bool result = false; |
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438 |
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439 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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440 if ((heap_size < (*gen0_size_ptr + min_gen1_size)) && |
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441 (heap_size >= min_gen1_size + min_alignment())) { |
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442 // Adjust gen0 down to accommodate min_gen1_size |
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443 *gen0_size_ptr = heap_size - min_gen1_size; |
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444 *gen0_size_ptr = |
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445 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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446 min_alignment()); |
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447 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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448 result = true; |
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449 } else { |
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450 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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451 *gen1_size_ptr = |
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452 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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453 min_alignment()); |
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454 } |
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455 } |
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456 return result; |
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457 } |
0 | 458 |
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459 // Minimum sizes of the generations may be different than |
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460 // the initial sizes. An inconsistently is permitted here |
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461 // in the total size that can be specified explicitly by |
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462 // command line specification of OldSize and NewSize and |
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463 // also a command line specification of -Xms. Issue a warning |
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464 // but allow the values to pass. |
0 | 465 |
466 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
467 GenCollectorPolicy::initialize_size_info(); | |
468 | |
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469 // At this point the minimum, initial and maximum sizes |
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470 // of the overall heap and of gen0 have been determined. |
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471 // The maximum gen1 size can be determined from the maximum gen0 |
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472 // and maximum heap size since no explicit flags exits |
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473 // for setting the gen1 maximum. |
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474 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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475 _max_gen1_size = |
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476 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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477 min_alignment()); |
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478 // If no explicit command line flag has been set for the |
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479 // gen1 size, use what is left for gen1. |
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480 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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481 // The user has not specified any value or ergonomics |
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482 // has chosen a value (which may or may not be consistent |
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483 // with the overall heap size). In either case make |
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484 // the minimum, maximum and initial sizes consistent |
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485 // with the gen0 sizes and the overall heap sizes. |
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486 assert(min_heap_byte_size() > _min_gen0_size, |
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487 "gen0 has an unexpected minimum size"); |
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488 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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489 set_min_gen1_size( |
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490 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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491 min_alignment())); |
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492 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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493 set_initial_gen1_size( |
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494 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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495 min_alignment())); |
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496 |
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497 } else { |
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498 // It's been explicitly set on the command line. Use the |
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499 // OldSize and then determine the consequences. |
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500 set_min_gen1_size(OldSize); |
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501 set_initial_gen1_size(OldSize); |
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502 |
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503 // If the user has explicitly set an OldSize that is inconsistent |
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504 // with other command line flags, issue a warning. |
0 | 505 // The generation minimums and the overall heap mimimum should |
506 // be within one heap alignment. | |
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507 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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508 min_heap_byte_size()) { |
0 | 509 warning("Inconsistency between minimum heap size and minimum " |
13
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510 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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511 min_heap_byte_size()); |
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512 } |
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513 if ((OldSize > _max_gen1_size)) { |
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514 warning("Inconsistency between maximum heap size and maximum " |
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515 "generation sizes: using maximum heap = " SIZE_FORMAT |
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516 " -XX:OldSize flag is being ignored", |
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517 max_heap_byte_size()); |
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518 } |
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519 // If there is an inconsistency between the OldSize and the minimum and/or |
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520 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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521 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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522 min_heap_byte_size(), OldSize)) { |
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523 if (PrintGCDetails && Verbose) { |
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524 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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525 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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526 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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527 } |
0 | 528 } |
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529 // Initial size |
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530 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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531 initial_heap_byte_size(), OldSize)) { |
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532 if (PrintGCDetails && Verbose) { |
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533 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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534 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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535 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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536 } |
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537 } |
0 | 538 } |
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539 // Enforce the maximum gen1 size. |
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540 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 541 |
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542 // Check that min gen1 <= initial gen1 <= max gen1 |
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543 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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544 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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545 |
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546 if (PrintGCDetails && Verbose) { |
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547 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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548 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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549 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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550 } |
0 | 551 } |
552 | |
553 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
554 bool is_tlab, | |
555 bool* gc_overhead_limit_was_exceeded) { | |
556 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
557 | |
558 debug_only(gch->check_for_valid_allocation_state()); | |
559 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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560 |
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561 // In general gc_overhead_limit_was_exceeded should be false so |
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562 // set it so here and reset it to true only if the gc time |
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563 // limit is being exceeded as checked below. |
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564 *gc_overhead_limit_was_exceeded = false; |
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565 |
0 | 566 HeapWord* result = NULL; |
567 | |
568 // Loop until the allocation is satisified, | |
569 // or unsatisfied after GC. | |
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570 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
0 | 571 HandleMark hm; // discard any handles allocated in each iteration |
572 | |
573 // First allocation attempt is lock-free. | |
574 Generation *gen0 = gch->get_gen(0); | |
575 assert(gen0->supports_inline_contig_alloc(), | |
576 "Otherwise, must do alloc within heap lock"); | |
577 if (gen0->should_allocate(size, is_tlab)) { | |
578 result = gen0->par_allocate(size, is_tlab); | |
579 if (result != NULL) { | |
580 assert(gch->is_in_reserved(result), "result not in heap"); | |
581 return result; | |
582 } | |
583 } | |
584 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
585 { | |
586 MutexLocker ml(Heap_lock); | |
587 if (PrintGC && Verbose) { | |
588 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
589 " attempting locked slow path allocation"); | |
590 } | |
591 // Note that only large objects get a shot at being | |
592 // allocated in later generations. | |
593 bool first_only = ! should_try_older_generation_allocation(size); | |
594 | |
595 result = gch->attempt_allocation(size, is_tlab, first_only); | |
596 if (result != NULL) { | |
597 assert(gch->is_in_reserved(result), "result not in heap"); | |
598 return result; | |
599 } | |
600 | |
601 if (GC_locker::is_active_and_needs_gc()) { | |
602 if (is_tlab) { | |
603 return NULL; // Caller will retry allocating individual object | |
604 } | |
605 if (!gch->is_maximal_no_gc()) { | |
606 // Try and expand heap to satisfy request | |
607 result = expand_heap_and_allocate(size, is_tlab); | |
608 // result could be null if we are out of space | |
609 if (result != NULL) { | |
610 return result; | |
611 } | |
612 } | |
613 | |
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614 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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615 return NULL; // we didn't get to do a GC and we didn't get any memory |
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616 } |
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617 |
0 | 618 // If this thread is not in a jni critical section, we stall |
619 // the requestor until the critical section has cleared and | |
620 // GC allowed. When the critical section clears, a GC is | |
621 // initiated by the last thread exiting the critical section; so | |
622 // we retry the allocation sequence from the beginning of the loop, | |
623 // rather than causing more, now probably unnecessary, GC attempts. | |
624 JavaThread* jthr = JavaThread::current(); | |
625 if (!jthr->in_critical()) { | |
626 MutexUnlocker mul(Heap_lock); | |
627 // Wait for JNI critical section to be exited | |
628 GC_locker::stall_until_clear(); | |
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629 gclocker_stalled_count += 1; |
0 | 630 continue; |
631 } else { | |
632 if (CheckJNICalls) { | |
633 fatal("Possible deadlock due to allocating while" | |
634 " in jni critical section"); | |
635 } | |
636 return NULL; | |
637 } | |
638 } | |
639 | |
640 // Read the gc count while the heap lock is held. | |
641 gc_count_before = Universe::heap()->total_collections(); | |
642 } | |
643 | |
644 VM_GenCollectForAllocation op(size, | |
645 is_tlab, | |
646 gc_count_before); | |
647 VMThread::execute(&op); | |
648 if (op.prologue_succeeded()) { | |
649 result = op.result(); | |
650 if (op.gc_locked()) { | |
651 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
652 continue; // retry and/or stall as necessary | |
653 } | |
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654 |
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655 // Allocation has failed and a collection |
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656 // has been done. If the gc time limit was exceeded the |
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657 // this time, return NULL so that an out-of-memory |
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658 // will be thrown. Clear gc_overhead_limit_exceeded |
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659 // so that the overhead exceeded does not persist. |
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660 |
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661 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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662 const bool softrefs_clear = all_soft_refs_clear(); |
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663 |
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664 if (limit_exceeded && softrefs_clear) { |
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665 *gc_overhead_limit_was_exceeded = true; |
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666 size_policy()->set_gc_overhead_limit_exceeded(false); |
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667 if (op.result() != NULL) { |
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668 CollectedHeap::fill_with_object(op.result(), size); |
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669 } |
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670 return NULL; |
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671 } |
0 | 672 assert(result == NULL || gch->is_in_reserved(result), |
673 "result not in heap"); | |
674 return result; | |
675 } | |
676 | |
677 // Give a warning if we seem to be looping forever. | |
678 if ((QueuedAllocationWarningCount > 0) && | |
679 (try_count % QueuedAllocationWarningCount == 0)) { | |
680 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
681 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
682 } | |
683 } | |
684 } | |
685 | |
686 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
687 bool is_tlab) { | |
688 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
689 HeapWord* result = NULL; | |
690 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
691 Generation *gen = gch->get_gen(i); | |
692 if (gen->should_allocate(size, is_tlab)) { | |
693 result = gen->expand_and_allocate(size, is_tlab); | |
694 } | |
695 } | |
696 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
697 return result; | |
698 } | |
699 | |
700 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
701 bool is_tlab) { | |
702 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
703 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
704 HeapWord* result = NULL; | |
705 | |
706 assert(size != 0, "Precondition violated"); | |
707 if (GC_locker::is_active_and_needs_gc()) { | |
708 // GC locker is active; instead of a collection we will attempt | |
709 // to expand the heap, if there's room for expansion. | |
710 if (!gch->is_maximal_no_gc()) { | |
711 result = expand_heap_and_allocate(size, is_tlab); | |
712 } | |
713 return result; // could be null if we are out of space | |
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714 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 715 // Do an incremental collection. |
716 gch->do_collection(false /* full */, | |
717 false /* clear_all_soft_refs */, | |
718 size /* size */, | |
719 is_tlab /* is_tlab */, | |
720 number_of_generations() - 1 /* max_level */); | |
721 } else { | |
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722 if (Verbose && PrintGCDetails) { |
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723 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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724 } |
0 | 725 // Try a full collection; see delta for bug id 6266275 |
726 // for the original code and why this has been simplified | |
727 // with from-space allocation criteria modified and | |
728 // such allocation moved out of the safepoint path. | |
729 gch->do_collection(true /* full */, | |
730 false /* clear_all_soft_refs */, | |
731 size /* size */, | |
732 is_tlab /* is_tlab */, | |
733 number_of_generations() - 1 /* max_level */); | |
734 } | |
735 | |
736 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
737 | |
738 if (result != NULL) { | |
739 assert(gch->is_in_reserved(result), "result not in heap"); | |
740 return result; | |
741 } | |
742 | |
743 // OK, collection failed, try expansion. | |
744 result = expand_heap_and_allocate(size, is_tlab); | |
745 if (result != NULL) { | |
746 return result; | |
747 } | |
748 | |
749 // If we reach this point, we're really out of memory. Try every trick | |
750 // we can to reclaim memory. Force collection of soft references. Force | |
751 // a complete compaction of the heap. Any additional methods for finding | |
752 // free memory should be here, especially if they are expensive. If this | |
753 // attempt fails, an OOM exception will be thrown. | |
754 { | |
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755 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
0 | 756 |
757 gch->do_collection(true /* full */, | |
758 true /* clear_all_soft_refs */, | |
759 size /* size */, | |
760 is_tlab /* is_tlab */, | |
761 number_of_generations() - 1 /* max_level */); | |
762 } | |
763 | |
764 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
765 if (result != NULL) { | |
766 assert(gch->is_in_reserved(result), "result not in heap"); | |
767 return result; | |
768 } | |
769 | |
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770 assert(!should_clear_all_soft_refs(), |
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771 "Flag should have been handled and cleared prior to this point"); |
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772 |
0 | 773 // What else? We might try synchronous finalization later. If the total |
774 // space available is large enough for the allocation, then a more | |
775 // complete compaction phase than we've tried so far might be | |
776 // appropriate. | |
777 return NULL; | |
778 } | |
779 | |
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780 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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781 ClassLoaderData* loader_data, |
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782 size_t word_size, |
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783 Metaspace::MetadataType mdtype) { |
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784 uint loop_count = 0; |
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785 uint gc_count = 0; |
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786 uint full_gc_count = 0; |
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787 |
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788 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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789 |
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790 do { |
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791 MetaWord* result = NULL; |
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792 if (GC_locker::is_active_and_needs_gc()) { |
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793 // If the GC_locker is active, just expand and allocate. |
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794 // If that does not succeed, wait if this thread is not |
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795 // in a critical section itself. |
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796 result = |
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797 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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798 mdtype); |
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799 if (result != NULL) { |
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800 return result; |
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801 } |
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802 JavaThread* jthr = JavaThread::current(); |
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803 if (!jthr->in_critical()) { |
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804 // Wait for JNI critical section to be exited |
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805 GC_locker::stall_until_clear(); |
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806 // The GC invoked by the last thread leaving the critical |
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807 // section will be a young collection and a full collection |
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808 // is (currently) needed for unloading classes so continue |
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809 // to the next iteration to get a full GC. |
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810 continue; |
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811 } else { |
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812 if (CheckJNICalls) { |
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813 fatal("Possible deadlock due to allocating while" |
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814 " in jni critical section"); |
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815 } |
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816 return NULL; |
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817 } |
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818 } |
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819 |
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820 { // Need lock to get self consistent gc_count's |
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821 MutexLocker ml(Heap_lock); |
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822 gc_count = Universe::heap()->total_collections(); |
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823 full_gc_count = Universe::heap()->total_full_collections(); |
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824 } |
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825 |
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826 // Generate a VM operation |
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827 VM_CollectForMetadataAllocation op(loader_data, |
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828 word_size, |
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829 mdtype, |
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830 gc_count, |
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831 full_gc_count, |
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832 GCCause::_metadata_GC_threshold); |
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833 VMThread::execute(&op); |
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834 |
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835 // If GC was locked out, try again. Check |
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836 // before checking success because the prologue |
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837 // could have succeeded and the GC still have |
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838 // been locked out. |
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839 if (op.gc_locked()) { |
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840 continue; |
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841 } |
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842 |
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843 if (op.prologue_succeeded()) { |
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844 return op.result(); |
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845 } |
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846 loop_count++; |
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847 if ((QueuedAllocationWarningCount > 0) && |
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848 (loop_count % QueuedAllocationWarningCount == 0)) { |
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849 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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850 " size=%d", loop_count, word_size); |
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851 } |
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852 } while (true); // Until a GC is done |
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853 } |
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854 |
0 | 855 // Return true if any of the following is true: |
856 // . the allocation won't fit into the current young gen heap | |
857 // . gc locker is occupied (jni critical section) | |
858 // . heap memory is tight -- the most recent previous collection | |
859 // was a full collection because a partial collection (would | |
860 // have) failed and is likely to fail again | |
861 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
862 size_t word_size) const { | |
863 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
864 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
865 return (word_size > heap_word_size(gen0_capacity)) | |
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866 || GC_locker::is_active_and_needs_gc() |
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867 || gch->incremental_collection_failed(); |
0 | 868 } |
869 | |
870 | |
871 // | |
872 // MarkSweepPolicy methods | |
873 // | |
874 | |
875 MarkSweepPolicy::MarkSweepPolicy() { | |
876 initialize_all(); | |
877 } | |
878 | |
879 void MarkSweepPolicy::initialize_generations() { | |
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880 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL); |
0 | 881 if (_generations == NULL) |
882 vm_exit_during_initialization("Unable to allocate gen spec"); | |
883 | |
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884 if (UseParNewGC) { |
0 | 885 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
886 } else { | |
887 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
888 } | |
889 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
890 | |
891 if (_generations[0] == NULL || _generations[1] == NULL) | |
892 vm_exit_during_initialization("Unable to allocate gen spec"); | |
893 } | |
894 | |
895 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
896 // initialize the policy counters - 2 collectors, 3 generations | |
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897 if (UseParNewGC) { |
0 | 898 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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899 } else { |
0 | 900 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
901 } | |
902 } |