Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 12110:4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso
author | stefank |
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date | Fri, 16 Aug 2013 13:22:32 +0200 |
parents | 2958af1d8c5a |
children | 40136aa2cdb1 |
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 | |
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196 assert(alignment >= min_alignment(), "Must be"); |
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197 |
0 | 198 return alignment; |
199 } | |
200 | |
201 void GenCollectorPolicy::initialize_flags() { | |
202 // All sizes must be multiples of the generation granularity. | |
203 set_min_alignment((uintx) Generation::GenGrain); | |
204 set_max_alignment(compute_max_alignment()); | |
205 | |
206 CollectorPolicy::initialize_flags(); | |
207 | |
208 // All generational heaps have a youngest gen; handle those flags here. | |
209 | |
210 // Adjust max size parameters | |
211 if (NewSize > MaxNewSize) { | |
212 MaxNewSize = NewSize; | |
213 } | |
214 NewSize = align_size_down(NewSize, min_alignment()); | |
215 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
216 | |
217 // Check validity of heap flags | |
218 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
219 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
220 | |
221 if (NewSize < 3*min_alignment()) { | |
222 // make sure there room for eden and two survivor spaces | |
223 vm_exit_during_initialization("Too small new size specified"); | |
224 } | |
225 if (SurvivorRatio < 1 || NewRatio < 1) { | |
226 vm_exit_during_initialization("Invalid heap ratio specified"); | |
227 } | |
228 } | |
229 | |
230 void TwoGenerationCollectorPolicy::initialize_flags() { | |
231 GenCollectorPolicy::initialize_flags(); | |
232 | |
233 OldSize = align_size_down(OldSize, min_alignment()); | |
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234 |
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235 if (FLAG_IS_CMDLINE(OldSize) && FLAG_IS_DEFAULT(NewSize)) { |
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236 // NewRatio will be used later to set the young generation size so we use |
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237 // it to calculate how big the heap should be based on the requested OldSize |
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238 // and NewRatio. |
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239 assert(NewRatio > 0, "NewRatio should have been set up earlier"); |
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240 size_t calculated_heapsize = (OldSize / NewRatio) * (NewRatio + 1); |
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241 |
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242 calculated_heapsize = align_size_up(calculated_heapsize, max_alignment()); |
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243 MaxHeapSize = calculated_heapsize; |
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244 InitialHeapSize = calculated_heapsize; |
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245 } |
0 | 246 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
247 | |
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248 // adjust max heap size if necessary |
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249 if (NewSize + OldSize > MaxHeapSize) { |
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250 if (FLAG_IS_CMDLINE(MaxHeapSize)) { |
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251 // somebody set a maximum heap size with the intention that we should not |
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252 // exceed it. Adjust New/OldSize as necessary. |
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253 uintx calculated_size = NewSize + OldSize; |
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254 double shrink_factor = (double) MaxHeapSize / calculated_size; |
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255 // align |
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256 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); |
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257 // OldSize is already aligned because above we aligned MaxHeapSize to |
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258 // max_alignment(), and we just made sure that NewSize is aligned to |
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259 // min_alignment(). In initialize_flags() we verified that max_alignment() |
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260 // is a multiple of min_alignment(). |
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261 OldSize = MaxHeapSize - NewSize; |
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262 } else { |
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263 MaxHeapSize = NewSize + OldSize; |
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264 } |
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265 } |
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266 // need to do this again |
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267 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); |
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268 |
10284 | 269 // adjust max heap size if necessary |
270 if (NewSize + OldSize > MaxHeapSize) { | |
271 if (FLAG_IS_CMDLINE(MaxHeapSize)) { | |
272 // somebody set a maximum heap size with the intention that we should not | |
273 // exceed it. Adjust New/OldSize as necessary. | |
274 uintx calculated_size = NewSize + OldSize; | |
275 double shrink_factor = (double) MaxHeapSize / calculated_size; | |
276 // align | |
277 NewSize = align_size_down((uintx) (NewSize * shrink_factor), min_alignment()); | |
278 // OldSize is already aligned because above we aligned MaxHeapSize to | |
279 // max_alignment(), and we just made sure that NewSize is aligned to | |
280 // min_alignment(). In initialize_flags() we verified that max_alignment() | |
281 // is a multiple of min_alignment(). | |
282 OldSize = MaxHeapSize - NewSize; | |
283 } else { | |
284 MaxHeapSize = NewSize + OldSize; | |
285 } | |
286 } | |
287 // need to do this again | |
288 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
289 | |
0 | 290 always_do_update_barrier = UseConcMarkSweepGC; |
291 | |
292 // Check validity of heap flags | |
293 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
294 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
295 } | |
296 | |
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297 // Values set on the command line win over any ergonomically |
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298 // set command line parameters. |
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299 // Ergonomic choice of parameters are done before this |
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300 // method is called. Values for command line parameters such as NewSize |
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301 // and MaxNewSize feed those ergonomic choices into this method. |
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302 // This method makes the final generation sizings consistent with |
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303 // themselves and with overall heap sizings. |
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304 // In the absence of explicitly set command line flags, policies |
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305 // such as the use of NewRatio are used to size the generation. |
0 | 306 void GenCollectorPolicy::initialize_size_info() { |
307 CollectorPolicy::initialize_size_info(); | |
308 | |
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309 // min_alignment() is used for alignment within a generation. |
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310 // There is additional alignment done down stream for some |
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311 // collectors that sometimes causes unwanted rounding up of |
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312 // generations sizes. |
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313 |
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314 // Determine maximum size of gen0 |
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315 |
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316 size_t max_new_size = 0; |
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317 if (FLAG_IS_CMDLINE(MaxNewSize) || FLAG_IS_ERGO(MaxNewSize)) { |
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318 if (MaxNewSize < min_alignment()) { |
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319 max_new_size = min_alignment(); |
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320 } |
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321 if (MaxNewSize >= max_heap_byte_size()) { |
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322 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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323 min_alignment()); |
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324 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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325 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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326 "new generation size of " SIZE_FORMAT "k will be used.", |
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327 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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328 } else { |
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329 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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330 } |
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331 |
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332 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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333 // specially at this point to just use an ergonomically set |
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334 // MaxNewSize to set max_new_size. For cases with small |
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335 // heaps such a policy often did not work because the MaxNewSize |
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336 // was larger than the entire heap. The interpretation given |
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337 // to ergonomically set flags is that the flags are set |
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338 // by different collectors for their own special needs but |
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339 // are not allowed to badly shape the heap. This allows the |
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340 // different collectors to decide what's best for themselves |
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341 // without having to factor in the overall heap shape. It |
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342 // can be the case in the future that the collectors would |
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343 // only make "wise" ergonomics choices and this policy could |
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344 // just accept those choices. The choices currently made are |
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345 // not always "wise". |
0 | 346 } else { |
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347 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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348 // Bound the maximum size by NewSize below (since it historically |
0 | 349 // would have been NewSize and because the NewRatio calculation could |
350 // yield a size that is too small) and bound it by MaxNewSize above. | |
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351 // Ergonomics plays here by previously calculating the desired |
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352 // NewSize and MaxNewSize. |
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353 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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354 } |
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355 assert(max_new_size > 0, "All paths should set max_new_size"); |
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356 |
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357 // Given the maximum gen0 size, determine the initial and |
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358 // minimum gen0 sizes. |
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359 |
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360 if (max_heap_byte_size() == min_heap_byte_size()) { |
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361 // The maximum and minimum heap sizes are the same so |
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362 // the generations minimum and initial must be the |
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363 // same as its maximum. |
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364 set_min_gen0_size(max_new_size); |
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365 set_initial_gen0_size(max_new_size); |
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366 set_max_gen0_size(max_new_size); |
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367 } else { |
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368 size_t desired_new_size = 0; |
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369 if (!FLAG_IS_DEFAULT(NewSize)) { |
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370 // If NewSize is set ergonomically (for example by cms), it |
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371 // would make sense to use it. If it is used, also use it |
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372 // to set the initial size. Although there is no reason |
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373 // the minimum size and the initial size have to be the same, |
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374 // the current implementation gets into trouble during the calculation |
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375 // of the tenured generation sizes if they are different. |
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376 // Note that this makes the initial size and the minimum size |
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377 // generally small compared to the NewRatio calculation. |
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378 _min_gen0_size = NewSize; |
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379 desired_new_size = NewSize; |
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380 max_new_size = MAX2(max_new_size, NewSize); |
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381 } else { |
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382 // For the case where NewSize is the default, use NewRatio |
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383 // to size the minimum and initial generation sizes. |
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384 // Use the default NewSize as the floor for these values. If |
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385 // NewRatio is overly large, the resulting sizes can be too |
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386 // small. |
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387 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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388 NewSize); |
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389 desired_new_size = |
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390 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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391 NewSize); |
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392 } |
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393 |
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394 assert(_min_gen0_size > 0, "Sanity check"); |
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395 set_initial_gen0_size(desired_new_size); |
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396 set_max_gen0_size(max_new_size); |
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397 |
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398 // At this point the desirable initial and minimum sizes have been |
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399 // determined without regard to the maximum sizes. |
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400 |
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401 // Bound the sizes by the corresponding overall heap sizes. |
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402 set_min_gen0_size( |
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403 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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404 set_initial_gen0_size( |
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405 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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406 set_max_gen0_size( |
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407 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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408 |
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409 // At this point all three sizes have been checked against the |
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410 // maximum sizes but have not been checked for consistency |
342
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411 // among the three. |
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412 |
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413 // Final check min <= initial <= max |
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414 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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415 set_initial_gen0_size( |
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416 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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417 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 418 } |
419 | |
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420 if (PrintGCDetails && Verbose) { |
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421 gclog_or_tty->print_cr("1: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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422 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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423 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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424 } |
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425 } |
0 | 426 |
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427 // Call this method during the sizing of the gen1 to make |
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428 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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429 // the most freedom in sizing because it is done before the |
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430 // policy for gen1 is applied. Once gen1 policies have been applied, |
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431 // there may be conflicts in the shape of the heap and this method |
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432 // is used to make the needed adjustments. The application of the |
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433 // policies could be more sophisticated (iterative for example) but |
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434 // keeping it simple also seems a worthwhile goal. |
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435 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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436 size_t* gen1_size_ptr, |
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437 const size_t heap_size, |
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438 const size_t min_gen1_size) { |
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439 bool result = false; |
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440 |
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441 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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442 if ((heap_size < (*gen0_size_ptr + min_gen1_size)) && |
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443 (heap_size >= min_gen1_size + min_alignment())) { |
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444 // Adjust gen0 down to accommodate min_gen1_size |
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445 *gen0_size_ptr = heap_size - min_gen1_size; |
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446 *gen0_size_ptr = |
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447 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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448 min_alignment()); |
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449 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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450 result = true; |
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451 } else { |
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452 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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453 *gen1_size_ptr = |
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454 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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455 min_alignment()); |
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456 } |
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457 } |
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458 return result; |
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459 } |
0 | 460 |
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461 // Minimum sizes of the generations may be different than |
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462 // the initial sizes. An inconsistently is permitted here |
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463 // in the total size that can be specified explicitly by |
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464 // command line specification of OldSize and NewSize and |
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465 // also a command line specification of -Xms. Issue a warning |
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466 // but allow the values to pass. |
0 | 467 |
468 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
469 GenCollectorPolicy::initialize_size_info(); | |
470 | |
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471 // At this point the minimum, initial and maximum sizes |
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472 // of the overall heap and of gen0 have been determined. |
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473 // The maximum gen1 size can be determined from the maximum gen0 |
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474 // and maximum heap size since no explicit flags exits |
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475 // for setting the gen1 maximum. |
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476 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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477 _max_gen1_size = |
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478 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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479 min_alignment()); |
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480 // If no explicit command line flag has been set for the |
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481 // gen1 size, use what is left for gen1. |
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482 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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483 // The user has not specified any value or ergonomics |
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484 // has chosen a value (which may or may not be consistent |
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485 // with the overall heap size). In either case make |
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486 // the minimum, maximum and initial sizes consistent |
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487 // with the gen0 sizes and the overall heap sizes. |
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488 assert(min_heap_byte_size() > _min_gen0_size, |
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489 "gen0 has an unexpected minimum size"); |
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490 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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491 set_min_gen1_size( |
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492 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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493 min_alignment())); |
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494 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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495 set_initial_gen1_size( |
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496 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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497 min_alignment())); |
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498 |
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499 } else { |
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500 // It's been explicitly set on the command line. Use the |
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501 // OldSize and then determine the consequences. |
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502 set_min_gen1_size(OldSize); |
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503 set_initial_gen1_size(OldSize); |
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504 |
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505 // If the user has explicitly set an OldSize that is inconsistent |
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506 // with other command line flags, issue a warning. |
0 | 507 // The generation minimums and the overall heap mimimum should |
508 // be within one heap alignment. | |
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509 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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510 min_heap_byte_size()) { |
0 | 511 warning("Inconsistency between minimum heap size and minimum " |
13
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512 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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513 min_heap_byte_size()); |
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514 } |
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515 if ((OldSize > _max_gen1_size)) { |
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516 warning("Inconsistency between maximum heap size and maximum " |
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517 "generation sizes: using maximum heap = " SIZE_FORMAT |
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518 " -XX:OldSize flag is being ignored", |
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519 max_heap_byte_size()); |
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520 } |
13
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521 // If there is an inconsistency between the OldSize and the minimum and/or |
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522 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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523 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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524 min_heap_byte_size(), OldSize)) { |
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525 if (PrintGCDetails && Verbose) { |
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526 gclog_or_tty->print_cr("2: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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527 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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528 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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529 } |
0 | 530 } |
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531 // Initial size |
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532 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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533 initial_heap_byte_size(), OldSize)) { |
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534 if (PrintGCDetails && Verbose) { |
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535 gclog_or_tty->print_cr("3: Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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536 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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537 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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538 } |
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539 } |
0 | 540 } |
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541 // Enforce the maximum gen1 size. |
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542 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 543 |
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544 // Check that min gen1 <= initial gen1 <= max gen1 |
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545 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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546 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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547 |
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548 if (PrintGCDetails && Verbose) { |
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549 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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550 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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551 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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552 } |
0 | 553 } |
554 | |
555 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
556 bool is_tlab, | |
557 bool* gc_overhead_limit_was_exceeded) { | |
558 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
559 | |
560 debug_only(gch->check_for_valid_allocation_state()); | |
561 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
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562 |
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563 // In general gc_overhead_limit_was_exceeded should be false so |
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564 // set it so here and reset it to true only if the gc time |
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565 // limit is being exceeded as checked below. |
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566 *gc_overhead_limit_was_exceeded = false; |
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567 |
0 | 568 HeapWord* result = NULL; |
569 | |
570 // Loop until the allocation is satisified, | |
571 // or unsatisfied after GC. | |
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572 for (int try_count = 1, gclocker_stalled_count = 0; /* return or throw */; try_count += 1) { |
0 | 573 HandleMark hm; // discard any handles allocated in each iteration |
574 | |
575 // First allocation attempt is lock-free. | |
576 Generation *gen0 = gch->get_gen(0); | |
577 assert(gen0->supports_inline_contig_alloc(), | |
578 "Otherwise, must do alloc within heap lock"); | |
579 if (gen0->should_allocate(size, is_tlab)) { | |
580 result = gen0->par_allocate(size, is_tlab); | |
581 if (result != NULL) { | |
582 assert(gch->is_in_reserved(result), "result not in heap"); | |
583 return result; | |
584 } | |
585 } | |
586 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
587 { | |
588 MutexLocker ml(Heap_lock); | |
589 if (PrintGC && Verbose) { | |
590 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
591 " attempting locked slow path allocation"); | |
592 } | |
593 // Note that only large objects get a shot at being | |
594 // allocated in later generations. | |
595 bool first_only = ! should_try_older_generation_allocation(size); | |
596 | |
597 result = gch->attempt_allocation(size, is_tlab, first_only); | |
598 if (result != NULL) { | |
599 assert(gch->is_in_reserved(result), "result not in heap"); | |
600 return result; | |
601 } | |
602 | |
603 if (GC_locker::is_active_and_needs_gc()) { | |
604 if (is_tlab) { | |
605 return NULL; // Caller will retry allocating individual object | |
606 } | |
607 if (!gch->is_maximal_no_gc()) { | |
608 // Try and expand heap to satisfy request | |
609 result = expand_heap_and_allocate(size, is_tlab); | |
610 // result could be null if we are out of space | |
611 if (result != NULL) { | |
612 return result; | |
613 } | |
614 } | |
615 | |
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616 if (gclocker_stalled_count > GCLockerRetryAllocationCount) { |
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617 return NULL; // we didn't get to do a GC and we didn't get any memory |
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618 } |
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619 |
0 | 620 // If this thread is not in a jni critical section, we stall |
621 // the requestor until the critical section has cleared and | |
622 // GC allowed. When the critical section clears, a GC is | |
623 // initiated by the last thread exiting the critical section; so | |
624 // we retry the allocation sequence from the beginning of the loop, | |
625 // rather than causing more, now probably unnecessary, GC attempts. | |
626 JavaThread* jthr = JavaThread::current(); | |
627 if (!jthr->in_critical()) { | |
628 MutexUnlocker mul(Heap_lock); | |
629 // Wait for JNI critical section to be exited | |
630 GC_locker::stall_until_clear(); | |
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631 gclocker_stalled_count += 1; |
0 | 632 continue; |
633 } else { | |
634 if (CheckJNICalls) { | |
635 fatal("Possible deadlock due to allocating while" | |
636 " in jni critical section"); | |
637 } | |
638 return NULL; | |
639 } | |
640 } | |
641 | |
642 // Read the gc count while the heap lock is held. | |
643 gc_count_before = Universe::heap()->total_collections(); | |
644 } | |
645 | |
646 VM_GenCollectForAllocation op(size, | |
647 is_tlab, | |
648 gc_count_before); | |
649 VMThread::execute(&op); | |
650 if (op.prologue_succeeded()) { | |
651 result = op.result(); | |
652 if (op.gc_locked()) { | |
653 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
654 continue; // retry and/or stall as necessary | |
655 } | |
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656 |
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657 // Allocation has failed and a collection |
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658 // has been done. If the gc time limit was exceeded the |
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659 // this time, return NULL so that an out-of-memory |
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660 // will be thrown. Clear gc_overhead_limit_exceeded |
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661 // so that the overhead exceeded does not persist. |
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662 |
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663 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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664 const bool softrefs_clear = all_soft_refs_clear(); |
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665 |
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666 if (limit_exceeded && softrefs_clear) { |
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667 *gc_overhead_limit_was_exceeded = true; |
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668 size_policy()->set_gc_overhead_limit_exceeded(false); |
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669 if (op.result() != NULL) { |
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670 CollectedHeap::fill_with_object(op.result(), size); |
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671 } |
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672 return NULL; |
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673 } |
0 | 674 assert(result == NULL || gch->is_in_reserved(result), |
675 "result not in heap"); | |
676 return result; | |
677 } | |
678 | |
679 // Give a warning if we seem to be looping forever. | |
680 if ((QueuedAllocationWarningCount > 0) && | |
681 (try_count % QueuedAllocationWarningCount == 0)) { | |
682 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
683 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
684 } | |
685 } | |
686 } | |
687 | |
688 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
689 bool is_tlab) { | |
690 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
691 HeapWord* result = NULL; | |
692 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
693 Generation *gen = gch->get_gen(i); | |
694 if (gen->should_allocate(size, is_tlab)) { | |
695 result = gen->expand_and_allocate(size, is_tlab); | |
696 } | |
697 } | |
698 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
699 return result; | |
700 } | |
701 | |
702 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
703 bool is_tlab) { | |
704 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
705 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
706 HeapWord* result = NULL; | |
707 | |
708 assert(size != 0, "Precondition violated"); | |
709 if (GC_locker::is_active_and_needs_gc()) { | |
710 // GC locker is active; instead of a collection we will attempt | |
711 // to expand the heap, if there's room for expansion. | |
712 if (!gch->is_maximal_no_gc()) { | |
713 result = expand_heap_and_allocate(size, is_tlab); | |
714 } | |
715 return result; // could be null if we are out of space | |
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716 } else if (!gch->incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 717 // Do an incremental collection. |
718 gch->do_collection(false /* full */, | |
719 false /* clear_all_soft_refs */, | |
720 size /* size */, | |
721 is_tlab /* is_tlab */, | |
722 number_of_generations() - 1 /* max_level */); | |
723 } else { | |
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724 if (Verbose && PrintGCDetails) { |
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725 gclog_or_tty->print(" :: Trying full because partial may fail :: "); |
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726 } |
0 | 727 // Try a full collection; see delta for bug id 6266275 |
728 // for the original code and why this has been simplified | |
729 // with from-space allocation criteria modified and | |
730 // such allocation moved out of the safepoint path. | |
731 gch->do_collection(true /* full */, | |
732 false /* clear_all_soft_refs */, | |
733 size /* size */, | |
734 is_tlab /* is_tlab */, | |
735 number_of_generations() - 1 /* max_level */); | |
736 } | |
737 | |
738 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
739 | |
740 if (result != NULL) { | |
741 assert(gch->is_in_reserved(result), "result not in heap"); | |
742 return result; | |
743 } | |
744 | |
745 // OK, collection failed, try expansion. | |
746 result = expand_heap_and_allocate(size, is_tlab); | |
747 if (result != NULL) { | |
748 return result; | |
749 } | |
750 | |
751 // If we reach this point, we're really out of memory. Try every trick | |
752 // we can to reclaim memory. Force collection of soft references. Force | |
753 // a complete compaction of the heap. Any additional methods for finding | |
754 // free memory should be here, especially if they are expensive. If this | |
755 // attempt fails, an OOM exception will be thrown. | |
756 { | |
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757 UIntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted |
0 | 758 |
759 gch->do_collection(true /* full */, | |
760 true /* clear_all_soft_refs */, | |
761 size /* size */, | |
762 is_tlab /* is_tlab */, | |
763 number_of_generations() - 1 /* max_level */); | |
764 } | |
765 | |
766 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
767 if (result != NULL) { | |
768 assert(gch->is_in_reserved(result), "result not in heap"); | |
769 return result; | |
770 } | |
771 | |
1387
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772 assert(!should_clear_all_soft_refs(), |
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773 "Flag should have been handled and cleared prior to this point"); |
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774 |
0 | 775 // What else? We might try synchronous finalization later. If the total |
776 // space available is large enough for the allocation, then a more | |
777 // complete compaction phase than we've tried so far might be | |
778 // appropriate. | |
779 return NULL; | |
780 } | |
781 | |
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782 MetaWord* CollectorPolicy::satisfy_failed_metadata_allocation( |
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783 ClassLoaderData* loader_data, |
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784 size_t word_size, |
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785 Metaspace::MetadataType mdtype) { |
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786 uint loop_count = 0; |
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787 uint gc_count = 0; |
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788 uint full_gc_count = 0; |
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789 |
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790 assert(!Heap_lock->owned_by_self(), "Should not be holding the Heap_lock"); |
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791 |
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792 do { |
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793 MetaWord* result = NULL; |
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794 if (GC_locker::is_active_and_needs_gc()) { |
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795 // If the GC_locker is active, just expand and allocate. |
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796 // If that does not succeed, wait if this thread is not |
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797 // in a critical section itself. |
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798 result = |
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799 loader_data->metaspace_non_null()->expand_and_allocate(word_size, |
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800 mdtype); |
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801 if (result != NULL) { |
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802 return result; |
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803 } |
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804 JavaThread* jthr = JavaThread::current(); |
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805 if (!jthr->in_critical()) { |
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806 // Wait for JNI critical section to be exited |
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807 GC_locker::stall_until_clear(); |
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808 // The GC invoked by the last thread leaving the critical |
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809 // section will be a young collection and a full collection |
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810 // is (currently) needed for unloading classes so continue |
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811 // to the next iteration to get a full GC. |
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812 continue; |
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813 } else { |
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814 if (CheckJNICalls) { |
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815 fatal("Possible deadlock due to allocating while" |
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816 " in jni critical section"); |
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817 } |
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818 return NULL; |
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819 } |
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820 } |
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821 |
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822 { // Need lock to get self consistent gc_count's |
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823 MutexLocker ml(Heap_lock); |
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824 gc_count = Universe::heap()->total_collections(); |
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825 full_gc_count = Universe::heap()->total_full_collections(); |
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826 } |
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827 |
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828 // Generate a VM operation |
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829 VM_CollectForMetadataAllocation op(loader_data, |
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830 word_size, |
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831 mdtype, |
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832 gc_count, |
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833 full_gc_count, |
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834 GCCause::_metadata_GC_threshold); |
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835 VMThread::execute(&op); |
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836 |
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837 // If GC was locked out, try again. Check |
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838 // before checking success because the prologue |
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839 // could have succeeded and the GC still have |
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840 // been locked out. |
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841 if (op.gc_locked()) { |
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842 continue; |
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843 } |
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844 |
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845 if (op.prologue_succeeded()) { |
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846 return op.result(); |
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847 } |
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848 loop_count++; |
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849 if ((QueuedAllocationWarningCount > 0) && |
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850 (loop_count % QueuedAllocationWarningCount == 0)) { |
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851 warning("satisfy_failed_metadata_allocation() retries %d times \n\t" |
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852 " size=%d", loop_count, word_size); |
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853 } |
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854 } while (true); // Until a GC is done |
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855 } |
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856 |
0 | 857 // Return true if any of the following is true: |
858 // . the allocation won't fit into the current young gen heap | |
859 // . gc locker is occupied (jni critical section) | |
860 // . heap memory is tight -- the most recent previous collection | |
861 // was a full collection because a partial collection (would | |
862 // have) failed and is likely to fail again | |
863 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
864 size_t word_size) const { | |
865 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
866 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
867 return (word_size > heap_word_size(gen0_capacity)) | |
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868 || GC_locker::is_active_and_needs_gc() |
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869 || gch->incremental_collection_failed(); |
0 | 870 } |
871 | |
872 | |
873 // | |
874 // MarkSweepPolicy methods | |
875 // | |
876 | |
877 MarkSweepPolicy::MarkSweepPolicy() { | |
878 initialize_all(); | |
879 } | |
880 | |
881 void MarkSweepPolicy::initialize_generations() { | |
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882 _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL); |
0 | 883 if (_generations == NULL) |
884 vm_exit_during_initialization("Unable to allocate gen spec"); | |
885 | |
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886 if (UseParNewGC) { |
0 | 887 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); |
888 } else { | |
889 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
890 } | |
891 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
892 | |
893 if (_generations[0] == NULL || _generations[1] == NULL) | |
894 vm_exit_during_initialization("Unable to allocate gen spec"); | |
895 } | |
896 | |
897 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
898 // initialize the policy counters - 2 collectors, 3 generations | |
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899 if (UseParNewGC) { |
0 | 900 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); |
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901 } else { |
0 | 902 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); |
903 } | |
904 } |