Mercurial > hg > truffle
annotate src/share/vm/memory/collectorPolicy.cpp @ 1339:09ac706c2623
Merge
author | asaha |
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date | Wed, 24 Mar 2010 17:16:33 -0700 |
parents | 473cce303f13 |
children | 0bfd3fb24150 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_collectorPolicy.cpp.incl" | |
27 | |
28 // CollectorPolicy methods. | |
29 | |
30 void CollectorPolicy::initialize_flags() { | |
31 if (PermSize > MaxPermSize) { | |
32 MaxPermSize = PermSize; | |
33 } | |
342
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34 PermSize = MAX2(min_alignment(), align_size_down_(PermSize, min_alignment())); |
0 | 35 MaxPermSize = align_size_up(MaxPermSize, max_alignment()); |
36 | |
342
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37 MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment())); |
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38 MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment())); |
0 | 39 |
40 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
41 | |
42 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment()); | |
43 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment()); | |
44 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment()); | |
45 | |
46 assert(PermSize % min_alignment() == 0, "permanent space alignment"); | |
47 assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment"); | |
48 assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment"); | |
49 assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment"); | |
50 assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment"); | |
51 if (PermSize < M) { | |
52 vm_exit_during_initialization("Too small initial permanent heap"); | |
53 } | |
54 } | |
55 | |
56 void CollectorPolicy::initialize_size_info() { | |
57 // User inputs from -mx and ms are aligned | |
1064 | 58 set_initial_heap_byte_size(InitialHeapSize); |
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59 if (initial_heap_byte_size() == 0) { |
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60 set_initial_heap_byte_size(NewSize + OldSize); |
0 | 61 } |
342
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62 set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size, |
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63 min_alignment())); |
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64 |
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65 set_min_heap_byte_size(Arguments::min_heap_size()); |
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66 if (min_heap_byte_size() == 0) { |
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67 set_min_heap_byte_size(NewSize + OldSize); |
0 | 68 } |
342
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69 set_min_heap_byte_size(align_size_up(_min_heap_byte_size, |
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70 min_alignment())); |
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71 |
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72 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
0 | 73 |
74 // Check heap parameter properties | |
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75 if (initial_heap_byte_size() < M) { |
0 | 76 vm_exit_during_initialization("Too small initial heap"); |
77 } | |
78 // Check heap parameter properties | |
13
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79 if (min_heap_byte_size() < M) { |
0 | 80 vm_exit_during_initialization("Too small minimum heap"); |
81 } | |
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82 if (initial_heap_byte_size() <= NewSize) { |
0 | 83 // make sure there is at least some room in old space |
84 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
85 } | |
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86 if (max_heap_byte_size() < min_heap_byte_size()) { |
0 | 87 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
88 } | |
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89 if (initial_heap_byte_size() < min_heap_byte_size()) { |
0 | 90 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
91 } | |
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92 if (max_heap_byte_size() < initial_heap_byte_size()) { |
0 | 93 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
94 } | |
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95 |
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96 if (PrintGCDetails && Verbose) { |
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97 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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98 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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99 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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100 } |
0 | 101 } |
102 | |
103 void CollectorPolicy::initialize_perm_generation(PermGen::Name pgnm) { | |
104 _permanent_generation = | |
105 new PermanentGenerationSpec(pgnm, PermSize, MaxPermSize, | |
106 SharedReadOnlySize, | |
107 SharedReadWriteSize, | |
108 SharedMiscDataSize, | |
109 SharedMiscCodeSize); | |
110 if (_permanent_generation == NULL) { | |
111 vm_exit_during_initialization("Unable to allocate gen spec"); | |
112 } | |
113 } | |
114 | |
115 | |
116 GenRemSet* CollectorPolicy::create_rem_set(MemRegion whole_heap, | |
117 int max_covered_regions) { | |
118 switch (rem_set_name()) { | |
119 case GenRemSet::CardTable: { | |
120 CardTableRS* res = new CardTableRS(whole_heap, max_covered_regions); | |
121 return res; | |
122 } | |
123 default: | |
124 guarantee(false, "unrecognized GenRemSet::Name"); | |
125 return NULL; | |
126 } | |
127 } | |
128 | |
129 // GenCollectorPolicy methods. | |
130 | |
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131 size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) { |
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132 size_t x = base_size / (NewRatio+1); |
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133 size_t new_gen_size = x > min_alignment() ? |
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134 align_size_down(x, min_alignment()) : |
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135 min_alignment(); |
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136 return new_gen_size; |
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137 } |
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138 |
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139 size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size, |
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140 size_t maximum_size) { |
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141 size_t alignment = min_alignment(); |
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142 size_t max_minus = maximum_size - alignment; |
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143 return desired_size < max_minus ? desired_size : max_minus; |
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144 } |
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145 |
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146 |
0 | 147 void GenCollectorPolicy::initialize_size_policy(size_t init_eden_size, |
148 size_t init_promo_size, | |
149 size_t init_survivor_size) { | |
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150 const double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; |
0 | 151 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
152 init_promo_size, | |
153 init_survivor_size, | |
154 max_gc_minor_pause_sec, | |
155 GCTimeRatio); | |
156 } | |
157 | |
158 size_t GenCollectorPolicy::compute_max_alignment() { | |
159 // The card marking array and the offset arrays for old generations are | |
160 // committed in os pages as well. Make sure they are entirely full (to | |
161 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
162 // byte entry and the os page size is 4096, the maximum heap size should | |
163 // be 512*4096 = 2MB aligned. | |
164 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
165 | |
166 // Parallel GC does its own alignment of the generations to avoid requiring a | |
167 // large page (256M on some platforms) for the permanent generation. The | |
168 // other collectors should also be updated to do their own alignment and then | |
169 // this use of lcm() should be removed. | |
170 if (UseLargePages && !UseParallelGC) { | |
171 // in presence of large pages we have to make sure that our | |
172 // alignment is large page aware | |
173 alignment = lcm(os::large_page_size(), alignment); | |
174 } | |
175 | |
176 return alignment; | |
177 } | |
178 | |
179 void GenCollectorPolicy::initialize_flags() { | |
180 // All sizes must be multiples of the generation granularity. | |
181 set_min_alignment((uintx) Generation::GenGrain); | |
182 set_max_alignment(compute_max_alignment()); | |
183 assert(max_alignment() >= min_alignment() && | |
184 max_alignment() % min_alignment() == 0, | |
185 "invalid alignment constraints"); | |
186 | |
187 CollectorPolicy::initialize_flags(); | |
188 | |
189 // All generational heaps have a youngest gen; handle those flags here. | |
190 | |
191 // Adjust max size parameters | |
192 if (NewSize > MaxNewSize) { | |
193 MaxNewSize = NewSize; | |
194 } | |
195 NewSize = align_size_down(NewSize, min_alignment()); | |
196 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
197 | |
198 // Check validity of heap flags | |
199 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
200 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
201 | |
202 if (NewSize < 3*min_alignment()) { | |
203 // make sure there room for eden and two survivor spaces | |
204 vm_exit_during_initialization("Too small new size specified"); | |
205 } | |
206 if (SurvivorRatio < 1 || NewRatio < 1) { | |
207 vm_exit_during_initialization("Invalid heap ratio specified"); | |
208 } | |
209 } | |
210 | |
211 void TwoGenerationCollectorPolicy::initialize_flags() { | |
212 GenCollectorPolicy::initialize_flags(); | |
213 | |
214 OldSize = align_size_down(OldSize, min_alignment()); | |
215 if (NewSize + OldSize > MaxHeapSize) { | |
216 MaxHeapSize = NewSize + OldSize; | |
217 } | |
218 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
219 | |
220 always_do_update_barrier = UseConcMarkSweepGC; | |
221 BlockOffsetArrayUseUnallocatedBlock = | |
222 BlockOffsetArrayUseUnallocatedBlock || ParallelGCThreads > 0; | |
223 | |
224 // Check validity of heap flags | |
225 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
226 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
227 } | |
228 | |
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229 // Values set on the command line win over any ergonomically |
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230 // set command line parameters. |
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231 // Ergonomic choice of parameters are done before this |
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232 // method is called. Values for command line parameters such as NewSize |
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233 // and MaxNewSize feed those ergonomic choices into this method. |
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234 // This method makes the final generation sizings consistent with |
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235 // themselves and with overall heap sizings. |
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236 // In the absence of explicitly set command line flags, policies |
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237 // such as the use of NewRatio are used to size the generation. |
0 | 238 void GenCollectorPolicy::initialize_size_info() { |
239 CollectorPolicy::initialize_size_info(); | |
240 | |
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241 // min_alignment() is used for alignment within a generation. |
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242 // There is additional alignment done down stream for some |
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243 // collectors that sometimes causes unwanted rounding up of |
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244 // generations sizes. |
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245 |
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246 // Determine maximum size of gen0 |
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247 |
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248 size_t max_new_size = 0; |
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249 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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250 if (MaxNewSize < min_alignment()) { |
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251 max_new_size = min_alignment(); |
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252 } else if (MaxNewSize >= max_heap_byte_size()) { |
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253 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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254 min_alignment()); |
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255 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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256 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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257 "new generation size of " SIZE_FORMAT "k will be used.", |
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258 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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259 } else { |
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260 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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261 } |
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262 |
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263 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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264 // specially at this point to just use an ergonomically set |
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265 // MaxNewSize to set max_new_size. For cases with small |
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266 // heaps such a policy often did not work because the MaxNewSize |
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267 // was larger than the entire heap. The interpretation given |
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268 // to ergonomically set flags is that the flags are set |
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269 // by different collectors for their own special needs but |
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270 // are not allowed to badly shape the heap. This allows the |
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271 // different collectors to decide what's best for themselves |
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272 // without having to factor in the overall heap shape. It |
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273 // can be the case in the future that the collectors would |
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274 // only make "wise" ergonomics choices and this policy could |
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275 // just accept those choices. The choices currently made are |
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276 // not always "wise". |
0 | 277 } else { |
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278 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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279 // Bound the maximum size by NewSize below (since it historically |
0 | 280 // would have been NewSize and because the NewRatio calculation could |
281 // yield a size that is too small) and bound it by MaxNewSize above. | |
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282 // Ergonomics plays here by previously calculating the desired |
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283 // NewSize and MaxNewSize. |
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284 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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285 } |
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286 assert(max_new_size > 0, "All paths should set max_new_size"); |
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287 |
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288 // Given the maximum gen0 size, determine the initial and |
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289 // minimum sizes. |
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290 |
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291 if (max_heap_byte_size() == min_heap_byte_size()) { |
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292 // The maximum and minimum heap sizes are the same so |
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293 // the generations minimum and initial must be the |
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294 // same as its maximum. |
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295 set_min_gen0_size(max_new_size); |
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296 set_initial_gen0_size(max_new_size); |
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297 set_max_gen0_size(max_new_size); |
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298 } else { |
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299 size_t desired_new_size = 0; |
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300 if (!FLAG_IS_DEFAULT(NewSize)) { |
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301 // If NewSize is set ergonomically (for example by cms), it |
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302 // would make sense to use it. If it is used, also use it |
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303 // to set the initial size. Although there is no reason |
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304 // the minimum size and the initial size have to be the same, |
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305 // the current implementation gets into trouble during the calculation |
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306 // of the tenured generation sizes if they are different. |
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307 // Note that this makes the initial size and the minimum size |
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308 // generally small compared to the NewRatio calculation. |
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309 _min_gen0_size = NewSize; |
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310 desired_new_size = NewSize; |
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311 max_new_size = MAX2(max_new_size, NewSize); |
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312 } else { |
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313 // For the case where NewSize is the default, use NewRatio |
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314 // to size the minimum and initial generation sizes. |
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315 // Use the default NewSize as the floor for these values. If |
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316 // NewRatio is overly large, the resulting sizes can be too |
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317 // small. |
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318 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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319 NewSize); |
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320 desired_new_size = |
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321 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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322 NewSize); |
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323 } |
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324 |
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325 assert(_min_gen0_size > 0, "Sanity check"); |
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326 set_initial_gen0_size(desired_new_size); |
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327 set_max_gen0_size(max_new_size); |
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328 |
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329 // At this point the desirable initial and minimum sizes have been |
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330 // determined without regard to the maximum sizes. |
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331 |
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332 // Bound the sizes by the corresponding overall heap sizes. |
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333 set_min_gen0_size( |
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334 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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335 set_initial_gen0_size( |
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336 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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337 set_max_gen0_size( |
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338 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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339 |
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340 // At this point all three sizes have been checked against the |
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341 // maximum sizes but have not been checked for consistency |
342
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342 // among the three. |
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343 |
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344 // Final check min <= initial <= max |
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345 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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346 set_initial_gen0_size( |
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347 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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348 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 349 } |
350 | |
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351 if (PrintGCDetails && Verbose) { |
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352 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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353 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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354 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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355 } |
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356 } |
0 | 357 |
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358 // Call this method during the sizing of the gen1 to make |
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359 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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360 // the most freedom in sizing because it is done before the |
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361 // policy for gen1 is applied. Once gen1 policies have been applied, |
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362 // there may be conflicts in the shape of the heap and this method |
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363 // is used to make the needed adjustments. The application of the |
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364 // policies could be more sophisticated (iterative for example) but |
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365 // keeping it simple also seems a worthwhile goal. |
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366 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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367 size_t* gen1_size_ptr, |
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368 size_t heap_size, |
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369 size_t min_gen0_size) { |
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370 bool result = false; |
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371 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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372 if (((*gen0_size_ptr + OldSize) > heap_size) && |
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373 (heap_size - min_gen0_size) >= min_alignment()) { |
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374 // Adjust gen0 down to accomodate OldSize |
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375 *gen0_size_ptr = heap_size - min_gen0_size; |
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376 *gen0_size_ptr = |
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377 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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378 min_alignment()); |
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379 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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380 result = true; |
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381 } else { |
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382 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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383 *gen1_size_ptr = |
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384 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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385 min_alignment()); |
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386 } |
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387 } |
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388 return result; |
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389 } |
0 | 390 |
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391 // Minimum sizes of the generations may be different than |
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392 // the initial sizes. An inconsistently is permitted here |
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393 // in the total size that can be specified explicitly by |
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394 // command line specification of OldSize and NewSize and |
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395 // also a command line specification of -Xms. Issue a warning |
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396 // but allow the values to pass. |
0 | 397 |
398 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
399 GenCollectorPolicy::initialize_size_info(); | |
400 | |
13
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401 // At this point the minimum, initial and maximum sizes |
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402 // of the overall heap and of gen0 have been determined. |
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403 // The maximum gen1 size can be determined from the maximum gen0 |
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404 // and maximum heap size since not explicit flags exits |
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405 // for setting the gen1 maximum. |
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406 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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407 _max_gen1_size = |
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408 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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409 min_alignment()); |
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410 // If no explicit command line flag has been set for the |
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411 // gen1 size, use what is left for gen1. |
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412 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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413 // The user has not specified any value or ergonomics |
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414 // has chosen a value (which may or may not be consistent |
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415 // with the overall heap size). In either case make |
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416 // the minimum, maximum and initial sizes consistent |
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417 // with the gen0 sizes and the overall heap sizes. |
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418 assert(min_heap_byte_size() > _min_gen0_size, |
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419 "gen0 has an unexpected minimum size"); |
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420 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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421 set_min_gen1_size( |
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422 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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423 min_alignment())); |
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424 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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425 set_initial_gen1_size( |
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426 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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427 min_alignment())); |
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428 |
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429 } else { |
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430 // It's been explicitly set on the command line. Use the |
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431 // OldSize and then determine the consequences. |
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432 set_min_gen1_size(OldSize); |
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433 set_initial_gen1_size(OldSize); |
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434 |
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435 // If the user has explicitly set an OldSize that is inconsistent |
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436 // with other command line flags, issue a warning. |
0 | 437 // The generation minimums and the overall heap mimimum should |
438 // be within one heap alignment. | |
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439 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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440 min_heap_byte_size()) { |
0 | 441 warning("Inconsistency between minimum heap size and minimum " |
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442 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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443 min_heap_byte_size()); |
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444 } |
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445 if ((OldSize > _max_gen1_size)) { |
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446 warning("Inconsistency between maximum heap size and maximum " |
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447 "generation sizes: using maximum heap = " SIZE_FORMAT |
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448 " -XX:OldSize flag is being ignored", |
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449 max_heap_byte_size()); |
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450 } |
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451 // If there is an inconsistency between the OldSize and the minimum and/or |
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452 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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453 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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454 min_heap_byte_size(), OldSize)) { |
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455 if (PrintGCDetails && Verbose) { |
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456 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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457 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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458 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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459 } |
0 | 460 } |
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461 // Initial size |
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462 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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463 initial_heap_byte_size(), OldSize)) { |
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464 if (PrintGCDetails && Verbose) { |
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465 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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466 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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467 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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468 } |
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469 } |
0 | 470 } |
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471 // Enforce the maximum gen1 size. |
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472 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 473 |
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474 // Check that min gen1 <= initial gen1 <= max gen1 |
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475 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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476 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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477 |
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478 if (PrintGCDetails && Verbose) { |
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479 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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480 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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481 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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482 } |
0 | 483 } |
484 | |
485 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
486 bool is_tlab, | |
487 bool* gc_overhead_limit_was_exceeded) { | |
488 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
489 | |
490 debug_only(gch->check_for_valid_allocation_state()); | |
491 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
492 HeapWord* result = NULL; | |
493 | |
494 // Loop until the allocation is satisified, | |
495 // or unsatisfied after GC. | |
496 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
497 HandleMark hm; // discard any handles allocated in each iteration | |
498 | |
499 // First allocation attempt is lock-free. | |
500 Generation *gen0 = gch->get_gen(0); | |
501 assert(gen0->supports_inline_contig_alloc(), | |
502 "Otherwise, must do alloc within heap lock"); | |
503 if (gen0->should_allocate(size, is_tlab)) { | |
504 result = gen0->par_allocate(size, is_tlab); | |
505 if (result != NULL) { | |
506 assert(gch->is_in_reserved(result), "result not in heap"); | |
507 return result; | |
508 } | |
509 } | |
510 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
511 { | |
512 MutexLocker ml(Heap_lock); | |
513 if (PrintGC && Verbose) { | |
514 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
515 " attempting locked slow path allocation"); | |
516 } | |
517 // Note that only large objects get a shot at being | |
518 // allocated in later generations. | |
519 bool first_only = ! should_try_older_generation_allocation(size); | |
520 | |
521 result = gch->attempt_allocation(size, is_tlab, first_only); | |
522 if (result != NULL) { | |
523 assert(gch->is_in_reserved(result), "result not in heap"); | |
524 return result; | |
525 } | |
526 | |
527 // There are NULL's returned for different circumstances below. | |
528 // In general gc_overhead_limit_was_exceeded should be false so | |
529 // set it so here and reset it to true only if the gc time | |
530 // limit is being exceeded as checked below. | |
531 *gc_overhead_limit_was_exceeded = false; | |
532 | |
533 if (GC_locker::is_active_and_needs_gc()) { | |
534 if (is_tlab) { | |
535 return NULL; // Caller will retry allocating individual object | |
536 } | |
537 if (!gch->is_maximal_no_gc()) { | |
538 // Try and expand heap to satisfy request | |
539 result = expand_heap_and_allocate(size, is_tlab); | |
540 // result could be null if we are out of space | |
541 if (result != NULL) { | |
542 return result; | |
543 } | |
544 } | |
545 | |
546 // If this thread is not in a jni critical section, we stall | |
547 // the requestor until the critical section has cleared and | |
548 // GC allowed. When the critical section clears, a GC is | |
549 // initiated by the last thread exiting the critical section; so | |
550 // we retry the allocation sequence from the beginning of the loop, | |
551 // rather than causing more, now probably unnecessary, GC attempts. | |
552 JavaThread* jthr = JavaThread::current(); | |
553 if (!jthr->in_critical()) { | |
554 MutexUnlocker mul(Heap_lock); | |
555 // Wait for JNI critical section to be exited | |
556 GC_locker::stall_until_clear(); | |
557 continue; | |
558 } else { | |
559 if (CheckJNICalls) { | |
560 fatal("Possible deadlock due to allocating while" | |
561 " in jni critical section"); | |
562 } | |
563 return NULL; | |
564 } | |
565 } | |
566 | |
567 // Read the gc count while the heap lock is held. | |
568 gc_count_before = Universe::heap()->total_collections(); | |
569 } | |
570 | |
571 // Allocation has failed and a collection is about | |
572 // to be done. If the gc time limit was exceeded the | |
573 // last time a collection was done, return NULL so | |
574 // that an out-of-memory will be thrown. Clear | |
575 // gc_time_limit_exceeded so that subsequent attempts | |
576 // at a collection will be made. | |
577 if (size_policy()->gc_time_limit_exceeded()) { | |
578 *gc_overhead_limit_was_exceeded = true; | |
579 size_policy()->set_gc_time_limit_exceeded(false); | |
580 return NULL; | |
581 } | |
582 | |
583 VM_GenCollectForAllocation op(size, | |
584 is_tlab, | |
585 gc_count_before); | |
586 VMThread::execute(&op); | |
587 if (op.prologue_succeeded()) { | |
588 result = op.result(); | |
589 if (op.gc_locked()) { | |
590 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
591 continue; // retry and/or stall as necessary | |
592 } | |
593 assert(result == NULL || gch->is_in_reserved(result), | |
594 "result not in heap"); | |
595 return result; | |
596 } | |
597 | |
598 // Give a warning if we seem to be looping forever. | |
599 if ((QueuedAllocationWarningCount > 0) && | |
600 (try_count % QueuedAllocationWarningCount == 0)) { | |
601 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
602 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
603 } | |
604 } | |
605 } | |
606 | |
607 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
608 bool is_tlab) { | |
609 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
610 HeapWord* result = NULL; | |
611 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
612 Generation *gen = gch->get_gen(i); | |
613 if (gen->should_allocate(size, is_tlab)) { | |
614 result = gen->expand_and_allocate(size, is_tlab); | |
615 } | |
616 } | |
617 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
618 return result; | |
619 } | |
620 | |
621 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
622 bool is_tlab) { | |
623 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
624 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
625 HeapWord* result = NULL; | |
626 | |
627 assert(size != 0, "Precondition violated"); | |
628 if (GC_locker::is_active_and_needs_gc()) { | |
629 // GC locker is active; instead of a collection we will attempt | |
630 // to expand the heap, if there's room for expansion. | |
631 if (!gch->is_maximal_no_gc()) { | |
632 result = expand_heap_and_allocate(size, is_tlab); | |
633 } | |
634 return result; // could be null if we are out of space | |
635 } else if (!gch->incremental_collection_will_fail()) { | |
636 // The gc_prologues have not executed yet. The value | |
637 // for incremental_collection_will_fail() is the remanent | |
638 // of the last collection. | |
639 // Do an incremental collection. | |
640 gch->do_collection(false /* full */, | |
641 false /* clear_all_soft_refs */, | |
642 size /* size */, | |
643 is_tlab /* is_tlab */, | |
644 number_of_generations() - 1 /* max_level */); | |
645 } else { | |
646 // Try a full collection; see delta for bug id 6266275 | |
647 // for the original code and why this has been simplified | |
648 // with from-space allocation criteria modified and | |
649 // such allocation moved out of the safepoint path. | |
650 gch->do_collection(true /* full */, | |
651 false /* clear_all_soft_refs */, | |
652 size /* size */, | |
653 is_tlab /* is_tlab */, | |
654 number_of_generations() - 1 /* max_level */); | |
655 } | |
656 | |
657 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
658 | |
659 if (result != NULL) { | |
660 assert(gch->is_in_reserved(result), "result not in heap"); | |
661 return result; | |
662 } | |
663 | |
664 // OK, collection failed, try expansion. | |
665 result = expand_heap_and_allocate(size, is_tlab); | |
666 if (result != NULL) { | |
667 return result; | |
668 } | |
669 | |
670 // If we reach this point, we're really out of memory. Try every trick | |
671 // we can to reclaim memory. Force collection of soft references. Force | |
672 // a complete compaction of the heap. Any additional methods for finding | |
673 // free memory should be here, especially if they are expensive. If this | |
674 // attempt fails, an OOM exception will be thrown. | |
675 { | |
676 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
677 | |
678 gch->do_collection(true /* full */, | |
679 true /* clear_all_soft_refs */, | |
680 size /* size */, | |
681 is_tlab /* is_tlab */, | |
682 number_of_generations() - 1 /* max_level */); | |
683 } | |
684 | |
685 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
686 if (result != NULL) { | |
687 assert(gch->is_in_reserved(result), "result not in heap"); | |
688 return result; | |
689 } | |
690 | |
691 // What else? We might try synchronous finalization later. If the total | |
692 // space available is large enough for the allocation, then a more | |
693 // complete compaction phase than we've tried so far might be | |
694 // appropriate. | |
695 return NULL; | |
696 } | |
697 | |
698 size_t GenCollectorPolicy::large_typearray_limit() { | |
699 return FastAllocateSizeLimit; | |
700 } | |
701 | |
702 // Return true if any of the following is true: | |
703 // . the allocation won't fit into the current young gen heap | |
704 // . gc locker is occupied (jni critical section) | |
705 // . heap memory is tight -- the most recent previous collection | |
706 // was a full collection because a partial collection (would | |
707 // have) failed and is likely to fail again | |
708 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
709 size_t word_size) const { | |
710 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
711 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
712 return (word_size > heap_word_size(gen0_capacity)) | |
713 || (GC_locker::is_active_and_needs_gc()) | |
714 || ( gch->last_incremental_collection_failed() | |
715 && gch->incremental_collection_will_fail()); | |
716 } | |
717 | |
718 | |
719 // | |
720 // MarkSweepPolicy methods | |
721 // | |
722 | |
723 MarkSweepPolicy::MarkSweepPolicy() { | |
724 initialize_all(); | |
725 } | |
726 | |
727 void MarkSweepPolicy::initialize_generations() { | |
728 initialize_perm_generation(PermGen::MarkSweepCompact); | |
729 _generations = new GenerationSpecPtr[number_of_generations()]; | |
730 if (_generations == NULL) | |
731 vm_exit_during_initialization("Unable to allocate gen spec"); | |
732 | |
733 if (UseParNewGC && ParallelGCThreads > 0) { | |
734 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); | |
735 } else { | |
736 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
737 } | |
738 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
739 | |
740 if (_generations[0] == NULL || _generations[1] == NULL) | |
741 vm_exit_during_initialization("Unable to allocate gen spec"); | |
742 } | |
743 | |
744 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
745 // initialize the policy counters - 2 collectors, 3 generations | |
746 if (UseParNewGC && ParallelGCThreads > 0) { | |
747 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); | |
748 } | |
749 else { | |
750 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); | |
751 } | |
752 } |