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annotate src/share/vm/memory/collectorPolicy.cpp @ 1966:4110c3e0c50d
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author | iveresov |
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date | Fri, 19 Nov 2010 17:01:34 -0800 |
parents | a7214d79fcf1 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
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())); |
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35 // Don't increase Perm size limit above specified. |
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36 MaxPermSize = align_size_down(MaxPermSize, max_alignment()); |
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37 if (PermSize > MaxPermSize) { |
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38 PermSize = MaxPermSize; |
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39 } |
0 | 40 |
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41 MinPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MinPermHeapExpansion, min_alignment())); |
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42 MaxPermHeapExpansion = MAX2(min_alignment(), align_size_down_(MaxPermHeapExpansion, min_alignment())); |
0 | 43 |
44 MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment()); | |
45 | |
46 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment()); | |
47 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment()); | |
48 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment()); | |
49 | |
50 assert(PermSize % min_alignment() == 0, "permanent space alignment"); | |
51 assert(MaxPermSize % max_alignment() == 0, "maximum permanent space alignment"); | |
52 assert(SharedReadOnlySize % max_alignment() == 0, "read-only space alignment"); | |
53 assert(SharedReadWriteSize % max_alignment() == 0, "read-write space alignment"); | |
54 assert(SharedMiscDataSize % max_alignment() == 0, "misc-data space alignment"); | |
55 if (PermSize < M) { | |
56 vm_exit_during_initialization("Too small initial permanent heap"); | |
57 } | |
58 } | |
59 | |
60 void CollectorPolicy::initialize_size_info() { | |
61 // User inputs from -mx and ms are aligned | |
1064 | 62 set_initial_heap_byte_size(InitialHeapSize); |
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63 if (initial_heap_byte_size() == 0) { |
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64 set_initial_heap_byte_size(NewSize + OldSize); |
0 | 65 } |
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66 set_initial_heap_byte_size(align_size_up(_initial_heap_byte_size, |
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67 min_alignment())); |
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68 |
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69 set_min_heap_byte_size(Arguments::min_heap_size()); |
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70 if (min_heap_byte_size() == 0) { |
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71 set_min_heap_byte_size(NewSize + OldSize); |
0 | 72 } |
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73 set_min_heap_byte_size(align_size_up(_min_heap_byte_size, |
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74 min_alignment())); |
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75 |
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76 set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment())); |
0 | 77 |
78 // Check heap parameter properties | |
13
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79 if (initial_heap_byte_size() < M) { |
0 | 80 vm_exit_during_initialization("Too small initial heap"); |
81 } | |
82 // Check heap parameter properties | |
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83 if (min_heap_byte_size() < M) { |
0 | 84 vm_exit_during_initialization("Too small minimum heap"); |
85 } | |
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86 if (initial_heap_byte_size() <= NewSize) { |
0 | 87 // make sure there is at least some room in old space |
88 vm_exit_during_initialization("Too small initial heap for new size specified"); | |
89 } | |
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90 if (max_heap_byte_size() < min_heap_byte_size()) { |
0 | 91 vm_exit_during_initialization("Incompatible minimum and maximum heap sizes specified"); |
92 } | |
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93 if (initial_heap_byte_size() < min_heap_byte_size()) { |
0 | 94 vm_exit_during_initialization("Incompatible minimum and initial heap sizes specified"); |
95 } | |
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96 if (max_heap_byte_size() < initial_heap_byte_size()) { |
0 | 97 vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified"); |
98 } | |
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99 |
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100 if (PrintGCDetails && Verbose) { |
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101 gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " |
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102 SIZE_FORMAT " Maximum heap " SIZE_FORMAT, |
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103 min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size()); |
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104 } |
0 | 105 } |
106 | |
107 void CollectorPolicy::initialize_perm_generation(PermGen::Name pgnm) { | |
108 _permanent_generation = | |
109 new PermanentGenerationSpec(pgnm, PermSize, MaxPermSize, | |
110 SharedReadOnlySize, | |
111 SharedReadWriteSize, | |
112 SharedMiscDataSize, | |
113 SharedMiscCodeSize); | |
114 if (_permanent_generation == NULL) { | |
115 vm_exit_during_initialization("Unable to allocate gen spec"); | |
116 } | |
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_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; |
0 | 171 _size_policy = new AdaptiveSizePolicy(init_eden_size, |
172 init_promo_size, | |
173 init_survivor_size, | |
174 max_gc_minor_pause_sec, | |
175 GCTimeRatio); | |
176 } | |
177 | |
178 size_t GenCollectorPolicy::compute_max_alignment() { | |
179 // The card marking array and the offset arrays for old generations are | |
180 // committed in os pages as well. Make sure they are entirely full (to | |
181 // avoid partial page problems), e.g. if 512 bytes heap corresponds to 1 | |
182 // byte entry and the os page size is 4096, the maximum heap size should | |
183 // be 512*4096 = 2MB aligned. | |
184 size_t alignment = GenRemSet::max_alignment_constraint(rem_set_name()); | |
185 | |
186 // Parallel GC does its own alignment of the generations to avoid requiring a | |
187 // large page (256M on some platforms) for the permanent generation. The | |
188 // other collectors should also be updated to do their own alignment and then | |
189 // this use of lcm() should be removed. | |
190 if (UseLargePages && !UseParallelGC) { | |
191 // in presence of large pages we have to make sure that our | |
192 // alignment is large page aware | |
193 alignment = lcm(os::large_page_size(), alignment); | |
194 } | |
195 | |
196 return alignment; | |
197 } | |
198 | |
199 void GenCollectorPolicy::initialize_flags() { | |
200 // All sizes must be multiples of the generation granularity. | |
201 set_min_alignment((uintx) Generation::GenGrain); | |
202 set_max_alignment(compute_max_alignment()); | |
203 assert(max_alignment() >= min_alignment() && | |
204 max_alignment() % min_alignment() == 0, | |
205 "invalid alignment constraints"); | |
206 | |
207 CollectorPolicy::initialize_flags(); | |
208 | |
209 // All generational heaps have a youngest gen; handle those flags here. | |
210 | |
211 // Adjust max size parameters | |
212 if (NewSize > MaxNewSize) { | |
213 MaxNewSize = NewSize; | |
214 } | |
215 NewSize = align_size_down(NewSize, min_alignment()); | |
216 MaxNewSize = align_size_down(MaxNewSize, min_alignment()); | |
217 | |
218 // Check validity of heap flags | |
219 assert(NewSize % min_alignment() == 0, "eden space alignment"); | |
220 assert(MaxNewSize % min_alignment() == 0, "survivor space alignment"); | |
221 | |
222 if (NewSize < 3*min_alignment()) { | |
223 // make sure there room for eden and two survivor spaces | |
224 vm_exit_during_initialization("Too small new size specified"); | |
225 } | |
226 if (SurvivorRatio < 1 || NewRatio < 1) { | |
227 vm_exit_during_initialization("Invalid heap ratio specified"); | |
228 } | |
229 } | |
230 | |
231 void TwoGenerationCollectorPolicy::initialize_flags() { | |
232 GenCollectorPolicy::initialize_flags(); | |
233 | |
234 OldSize = align_size_down(OldSize, min_alignment()); | |
235 if (NewSize + OldSize > MaxHeapSize) { | |
236 MaxHeapSize = NewSize + OldSize; | |
237 } | |
238 MaxHeapSize = align_size_up(MaxHeapSize, max_alignment()); | |
239 | |
240 always_do_update_barrier = UseConcMarkSweepGC; | |
241 BlockOffsetArrayUseUnallocatedBlock = | |
242 BlockOffsetArrayUseUnallocatedBlock || ParallelGCThreads > 0; | |
243 | |
244 // Check validity of heap flags | |
245 assert(OldSize % min_alignment() == 0, "old space alignment"); | |
246 assert(MaxHeapSize % max_alignment() == 0, "maximum heap alignment"); | |
247 } | |
248 | |
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249 // Values set on the command line win over any ergonomically |
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250 // set command line parameters. |
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251 // Ergonomic choice of parameters are done before this |
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252 // method is called. Values for command line parameters such as NewSize |
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253 // and MaxNewSize feed those ergonomic choices into this method. |
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254 // This method makes the final generation sizings consistent with |
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255 // themselves and with overall heap sizings. |
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256 // In the absence of explicitly set command line flags, policies |
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257 // such as the use of NewRatio are used to size the generation. |
0 | 258 void GenCollectorPolicy::initialize_size_info() { |
259 CollectorPolicy::initialize_size_info(); | |
260 | |
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261 // min_alignment() is used for alignment within a generation. |
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262 // There is additional alignment done down stream for some |
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263 // collectors that sometimes causes unwanted rounding up of |
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264 // generations sizes. |
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265 |
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266 // Determine maximum size of gen0 |
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267 |
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268 size_t max_new_size = 0; |
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269 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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270 if (MaxNewSize < min_alignment()) { |
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271 max_new_size = min_alignment(); |
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272 } else if (MaxNewSize >= max_heap_byte_size()) { |
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273 max_new_size = align_size_down(max_heap_byte_size() - min_alignment(), |
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274 min_alignment()); |
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275 warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or " |
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276 "greater than the entire heap (" SIZE_FORMAT "k). A " |
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277 "new generation size of " SIZE_FORMAT "k will be used.", |
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278 MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K); |
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279 } else { |
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280 max_new_size = align_size_down(MaxNewSize, min_alignment()); |
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281 } |
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282 |
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283 // The case for FLAG_IS_ERGO(MaxNewSize) could be treated |
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284 // specially at this point to just use an ergonomically set |
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285 // MaxNewSize to set max_new_size. For cases with small |
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286 // heaps such a policy often did not work because the MaxNewSize |
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287 // was larger than the entire heap. The interpretation given |
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288 // to ergonomically set flags is that the flags are set |
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289 // by different collectors for their own special needs but |
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290 // are not allowed to badly shape the heap. This allows the |
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291 // different collectors to decide what's best for themselves |
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292 // without having to factor in the overall heap shape. It |
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293 // can be the case in the future that the collectors would |
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294 // only make "wise" ergonomics choices and this policy could |
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295 // just accept those choices. The choices currently made are |
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296 // not always "wise". |
0 | 297 } else { |
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298 max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size()); |
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299 // Bound the maximum size by NewSize below (since it historically |
0 | 300 // would have been NewSize and because the NewRatio calculation could |
301 // yield a size that is too small) and bound it by MaxNewSize above. | |
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302 // Ergonomics plays here by previously calculating the desired |
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303 // NewSize and MaxNewSize. |
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304 max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize); |
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305 } |
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306 assert(max_new_size > 0, "All paths should set max_new_size"); |
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307 |
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308 // Given the maximum gen0 size, determine the initial and |
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309 // minimum sizes. |
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310 |
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311 if (max_heap_byte_size() == min_heap_byte_size()) { |
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312 // The maximum and minimum heap sizes are the same so |
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313 // the generations minimum and initial must be the |
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314 // same as its maximum. |
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315 set_min_gen0_size(max_new_size); |
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316 set_initial_gen0_size(max_new_size); |
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317 set_max_gen0_size(max_new_size); |
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318 } else { |
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319 size_t desired_new_size = 0; |
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320 if (!FLAG_IS_DEFAULT(NewSize)) { |
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321 // If NewSize is set ergonomically (for example by cms), it |
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322 // would make sense to use it. If it is used, also use it |
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323 // to set the initial size. Although there is no reason |
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324 // the minimum size and the initial size have to be the same, |
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325 // the current implementation gets into trouble during the calculation |
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326 // of the tenured generation sizes if they are different. |
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327 // Note that this makes the initial size and the minimum size |
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328 // generally small compared to the NewRatio calculation. |
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329 _min_gen0_size = NewSize; |
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330 desired_new_size = NewSize; |
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331 max_new_size = MAX2(max_new_size, NewSize); |
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332 } else { |
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333 // For the case where NewSize is the default, use NewRatio |
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334 // to size the minimum and initial generation sizes. |
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335 // Use the default NewSize as the floor for these values. If |
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336 // NewRatio is overly large, the resulting sizes can be too |
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337 // small. |
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338 _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()), |
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339 NewSize); |
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340 desired_new_size = |
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341 MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()), |
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342 NewSize); |
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343 } |
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344 |
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345 assert(_min_gen0_size > 0, "Sanity check"); |
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346 set_initial_gen0_size(desired_new_size); |
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347 set_max_gen0_size(max_new_size); |
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348 |
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349 // At this point the desirable initial and minimum sizes have been |
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350 // determined without regard to the maximum sizes. |
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351 |
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352 // Bound the sizes by the corresponding overall heap sizes. |
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353 set_min_gen0_size( |
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354 bound_minus_alignment(_min_gen0_size, min_heap_byte_size())); |
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355 set_initial_gen0_size( |
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356 bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size())); |
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357 set_max_gen0_size( |
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358 bound_minus_alignment(_max_gen0_size, max_heap_byte_size())); |
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359 |
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360 // At this point all three sizes have been checked against the |
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361 // maximum sizes but have not been checked for consistency |
342
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362 // among the three. |
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363 |
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364 // Final check min <= initial <= max |
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365 set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size)); |
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366 set_initial_gen0_size( |
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367 MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size)); |
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368 set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size)); |
0 | 369 } |
370 | |
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371 if (PrintGCDetails && Verbose) { |
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372 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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373 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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374 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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375 } |
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376 } |
0 | 377 |
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378 // Call this method during the sizing of the gen1 to make |
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379 // adjustments to gen0 because of gen1 sizing policy. gen0 initially has |
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380 // the most freedom in sizing because it is done before the |
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381 // policy for gen1 is applied. Once gen1 policies have been applied, |
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382 // there may be conflicts in the shape of the heap and this method |
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383 // is used to make the needed adjustments. The application of the |
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384 // policies could be more sophisticated (iterative for example) but |
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385 // keeping it simple also seems a worthwhile goal. |
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386 bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr, |
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387 size_t* gen1_size_ptr, |
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388 size_t heap_size, |
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389 size_t min_gen0_size) { |
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390 bool result = false; |
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391 if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) { |
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392 if (((*gen0_size_ptr + OldSize) > heap_size) && |
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393 (heap_size - min_gen0_size) >= min_alignment()) { |
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394 // Adjust gen0 down to accomodate OldSize |
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395 *gen0_size_ptr = heap_size - min_gen0_size; |
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396 *gen0_size_ptr = |
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397 MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()), |
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398 min_alignment()); |
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399 assert(*gen0_size_ptr > 0, "Min gen0 is too large"); |
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400 result = true; |
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401 } else { |
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402 *gen1_size_ptr = heap_size - *gen0_size_ptr; |
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403 *gen1_size_ptr = |
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404 MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()), |
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405 min_alignment()); |
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406 } |
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407 } |
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408 return result; |
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409 } |
0 | 410 |
13
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411 // Minimum sizes of the generations may be different than |
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412 // the initial sizes. An inconsistently is permitted here |
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413 // in the total size that can be specified explicitly by |
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414 // command line specification of OldSize and NewSize and |
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415 // also a command line specification of -Xms. Issue a warning |
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416 // but allow the values to pass. |
0 | 417 |
418 void TwoGenerationCollectorPolicy::initialize_size_info() { | |
419 GenCollectorPolicy::initialize_size_info(); | |
420 | |
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421 // At this point the minimum, initial and maximum sizes |
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422 // of the overall heap and of gen0 have been determined. |
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423 // The maximum gen1 size can be determined from the maximum gen0 |
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424 // and maximum heap size since not explicit flags exits |
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425 // for setting the gen1 maximum. |
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426 _max_gen1_size = max_heap_byte_size() - _max_gen0_size; |
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427 _max_gen1_size = |
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428 MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()), |
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429 min_alignment()); |
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430 // If no explicit command line flag has been set for the |
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431 // gen1 size, use what is left for gen1. |
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432 if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) { |
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433 // The user has not specified any value or ergonomics |
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434 // has chosen a value (which may or may not be consistent |
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435 // with the overall heap size). In either case make |
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436 // the minimum, maximum and initial sizes consistent |
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437 // with the gen0 sizes and the overall heap sizes. |
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438 assert(min_heap_byte_size() > _min_gen0_size, |
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439 "gen0 has an unexpected minimum size"); |
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440 set_min_gen1_size(min_heap_byte_size() - min_gen0_size()); |
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441 set_min_gen1_size( |
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442 MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()), |
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443 min_alignment())); |
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444 set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size()); |
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445 set_initial_gen1_size( |
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446 MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()), |
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447 min_alignment())); |
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448 |
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449 } else { |
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450 // It's been explicitly set on the command line. Use the |
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451 // OldSize and then determine the consequences. |
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452 set_min_gen1_size(OldSize); |
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453 set_initial_gen1_size(OldSize); |
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454 |
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455 // If the user has explicitly set an OldSize that is inconsistent |
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456 // with other command line flags, issue a warning. |
0 | 457 // The generation minimums and the overall heap mimimum should |
458 // be within one heap alignment. | |
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459 if ((_min_gen1_size + _min_gen0_size + min_alignment()) < |
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460 min_heap_byte_size()) { |
0 | 461 warning("Inconsistency between minimum heap size and minimum " |
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462 "generation sizes: using minimum heap = " SIZE_FORMAT, |
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463 min_heap_byte_size()); |
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464 } |
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465 if ((OldSize > _max_gen1_size)) { |
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466 warning("Inconsistency between maximum heap size and maximum " |
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467 "generation sizes: using maximum heap = " SIZE_FORMAT |
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468 " -XX:OldSize flag is being ignored", |
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469 max_heap_byte_size()); |
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470 } |
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471 // If there is an inconsistency between the OldSize and the minimum and/or |
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472 // initial size of gen0, since OldSize was explicitly set, OldSize wins. |
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473 if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size, |
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474 min_heap_byte_size(), OldSize)) { |
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475 if (PrintGCDetails && Verbose) { |
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476 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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477 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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478 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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479 } |
0 | 480 } |
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481 // Initial size |
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482 if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size, |
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483 initial_heap_byte_size(), OldSize)) { |
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484 if (PrintGCDetails && Verbose) { |
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485 gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT " Initial gen0 " |
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486 SIZE_FORMAT " Maximum gen0 " SIZE_FORMAT, |
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487 min_gen0_size(), initial_gen0_size(), max_gen0_size()); |
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488 } |
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489 } |
0 | 490 } |
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491 // Enforce the maximum gen1 size. |
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492 set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size)); |
0 | 493 |
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494 // Check that min gen1 <= initial gen1 <= max gen1 |
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495 set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size)); |
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496 set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size)); |
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497 |
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498 if (PrintGCDetails && Verbose) { |
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499 gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT " Initial gen1 " |
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500 SIZE_FORMAT " Maximum gen1 " SIZE_FORMAT, |
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501 min_gen1_size(), initial_gen1_size(), max_gen1_size()); |
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502 } |
0 | 503 } |
504 | |
505 HeapWord* GenCollectorPolicy::mem_allocate_work(size_t size, | |
506 bool is_tlab, | |
507 bool* gc_overhead_limit_was_exceeded) { | |
508 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
509 | |
510 debug_only(gch->check_for_valid_allocation_state()); | |
511 assert(gch->no_gc_in_progress(), "Allocation during gc not allowed"); | |
1387
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512 |
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513 // In general gc_overhead_limit_was_exceeded should be false so |
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514 // set it so here and reset it to true only if the gc time |
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515 // limit is being exceeded as checked below. |
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516 *gc_overhead_limit_was_exceeded = false; |
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517 |
0 | 518 HeapWord* result = NULL; |
519 | |
520 // Loop until the allocation is satisified, | |
521 // or unsatisfied after GC. | |
522 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
523 HandleMark hm; // discard any handles allocated in each iteration | |
524 | |
525 // First allocation attempt is lock-free. | |
526 Generation *gen0 = gch->get_gen(0); | |
527 assert(gen0->supports_inline_contig_alloc(), | |
528 "Otherwise, must do alloc within heap lock"); | |
529 if (gen0->should_allocate(size, is_tlab)) { | |
530 result = gen0->par_allocate(size, is_tlab); | |
531 if (result != NULL) { | |
532 assert(gch->is_in_reserved(result), "result not in heap"); | |
533 return result; | |
534 } | |
535 } | |
536 unsigned int gc_count_before; // read inside the Heap_lock locked region | |
537 { | |
538 MutexLocker ml(Heap_lock); | |
539 if (PrintGC && Verbose) { | |
540 gclog_or_tty->print_cr("TwoGenerationCollectorPolicy::mem_allocate_work:" | |
541 " attempting locked slow path allocation"); | |
542 } | |
543 // Note that only large objects get a shot at being | |
544 // allocated in later generations. | |
545 bool first_only = ! should_try_older_generation_allocation(size); | |
546 | |
547 result = gch->attempt_allocation(size, is_tlab, first_only); | |
548 if (result != NULL) { | |
549 assert(gch->is_in_reserved(result), "result not in heap"); | |
550 return result; | |
551 } | |
552 | |
553 if (GC_locker::is_active_and_needs_gc()) { | |
554 if (is_tlab) { | |
555 return NULL; // Caller will retry allocating individual object | |
556 } | |
557 if (!gch->is_maximal_no_gc()) { | |
558 // Try and expand heap to satisfy request | |
559 result = expand_heap_and_allocate(size, is_tlab); | |
560 // result could be null if we are out of space | |
561 if (result != NULL) { | |
562 return result; | |
563 } | |
564 } | |
565 | |
566 // If this thread is not in a jni critical section, we stall | |
567 // the requestor until the critical section has cleared and | |
568 // GC allowed. When the critical section clears, a GC is | |
569 // initiated by the last thread exiting the critical section; so | |
570 // we retry the allocation sequence from the beginning of the loop, | |
571 // rather than causing more, now probably unnecessary, GC attempts. | |
572 JavaThread* jthr = JavaThread::current(); | |
573 if (!jthr->in_critical()) { | |
574 MutexUnlocker mul(Heap_lock); | |
575 // Wait for JNI critical section to be exited | |
576 GC_locker::stall_until_clear(); | |
577 continue; | |
578 } else { | |
579 if (CheckJNICalls) { | |
580 fatal("Possible deadlock due to allocating while" | |
581 " in jni critical section"); | |
582 } | |
583 return NULL; | |
584 } | |
585 } | |
586 | |
587 // Read the gc count while the heap lock is held. | |
588 gc_count_before = Universe::heap()->total_collections(); | |
589 } | |
590 | |
591 VM_GenCollectForAllocation op(size, | |
592 is_tlab, | |
593 gc_count_before); | |
594 VMThread::execute(&op); | |
595 if (op.prologue_succeeded()) { | |
596 result = op.result(); | |
597 if (op.gc_locked()) { | |
598 assert(result == NULL, "must be NULL if gc_locked() is true"); | |
599 continue; // retry and/or stall as necessary | |
600 } | |
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601 |
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602 // Allocation has failed and a collection |
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603 // has been done. If the gc time limit was exceeded the |
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604 // this time, return NULL so that an out-of-memory |
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605 // will be thrown. Clear gc_overhead_limit_exceeded |
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606 // so that the overhead exceeded does not persist. |
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607 |
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608 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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609 const bool softrefs_clear = all_soft_refs_clear(); |
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610 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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611 if (limit_exceeded && softrefs_clear) { |
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612 *gc_overhead_limit_was_exceeded = true; |
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613 size_policy()->set_gc_overhead_limit_exceeded(false); |
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614 if (op.result() != NULL) { |
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615 CollectedHeap::fill_with_object(op.result(), size); |
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616 } |
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617 return NULL; |
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618 } |
0 | 619 assert(result == NULL || gch->is_in_reserved(result), |
620 "result not in heap"); | |
621 return result; | |
622 } | |
623 | |
624 // Give a warning if we seem to be looping forever. | |
625 if ((QueuedAllocationWarningCount > 0) && | |
626 (try_count % QueuedAllocationWarningCount == 0)) { | |
627 warning("TwoGenerationCollectorPolicy::mem_allocate_work retries %d times \n\t" | |
628 " size=%d %s", try_count, size, is_tlab ? "(TLAB)" : ""); | |
629 } | |
630 } | |
631 } | |
632 | |
633 HeapWord* GenCollectorPolicy::expand_heap_and_allocate(size_t size, | |
634 bool is_tlab) { | |
635 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
636 HeapWord* result = NULL; | |
637 for (int i = number_of_generations() - 1; i >= 0 && result == NULL; i--) { | |
638 Generation *gen = gch->get_gen(i); | |
639 if (gen->should_allocate(size, is_tlab)) { | |
640 result = gen->expand_and_allocate(size, is_tlab); | |
641 } | |
642 } | |
643 assert(result == NULL || gch->is_in_reserved(result), "result not in heap"); | |
644 return result; | |
645 } | |
646 | |
647 HeapWord* GenCollectorPolicy::satisfy_failed_allocation(size_t size, | |
648 bool is_tlab) { | |
649 GenCollectedHeap *gch = GenCollectedHeap::heap(); | |
650 GCCauseSetter x(gch, GCCause::_allocation_failure); | |
651 HeapWord* result = NULL; | |
652 | |
653 assert(size != 0, "Precondition violated"); | |
654 if (GC_locker::is_active_and_needs_gc()) { | |
655 // GC locker is active; instead of a collection we will attempt | |
656 // to expand the heap, if there's room for expansion. | |
657 if (!gch->is_maximal_no_gc()) { | |
658 result = expand_heap_and_allocate(size, is_tlab); | |
659 } | |
660 return result; // could be null if we are out of space | |
661 } else if (!gch->incremental_collection_will_fail()) { | |
662 // Do an incremental collection. | |
663 gch->do_collection(false /* full */, | |
664 false /* clear_all_soft_refs */, | |
665 size /* size */, | |
666 is_tlab /* is_tlab */, | |
667 number_of_generations() - 1 /* max_level */); | |
668 } else { | |
669 // Try a full collection; see delta for bug id 6266275 | |
670 // for the original code and why this has been simplified | |
671 // with from-space allocation criteria modified and | |
672 // such allocation moved out of the safepoint path. | |
673 gch->do_collection(true /* full */, | |
674 false /* clear_all_soft_refs */, | |
675 size /* size */, | |
676 is_tlab /* is_tlab */, | |
677 number_of_generations() - 1 /* max_level */); | |
678 } | |
679 | |
680 result = gch->attempt_allocation(size, is_tlab, false /*first_only*/); | |
681 | |
682 if (result != NULL) { | |
683 assert(gch->is_in_reserved(result), "result not in heap"); | |
684 return result; | |
685 } | |
686 | |
687 // OK, collection failed, try expansion. | |
688 result = expand_heap_and_allocate(size, is_tlab); | |
689 if (result != NULL) { | |
690 return result; | |
691 } | |
692 | |
693 // If we reach this point, we're really out of memory. Try every trick | |
694 // we can to reclaim memory. Force collection of soft references. Force | |
695 // a complete compaction of the heap. Any additional methods for finding | |
696 // free memory should be here, especially if they are expensive. If this | |
697 // attempt fails, an OOM exception will be thrown. | |
698 { | |
699 IntFlagSetting flag_change(MarkSweepAlwaysCompactCount, 1); // Make sure the heap is fully compacted | |
700 | |
701 gch->do_collection(true /* full */, | |
702 true /* clear_all_soft_refs */, | |
703 size /* size */, | |
704 is_tlab /* is_tlab */, | |
705 number_of_generations() - 1 /* max_level */); | |
706 } | |
707 | |
708 result = gch->attempt_allocation(size, is_tlab, false /* first_only */); | |
709 if (result != NULL) { | |
710 assert(gch->is_in_reserved(result), "result not in heap"); | |
711 return result; | |
712 } | |
713 | |
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714 assert(!should_clear_all_soft_refs(), |
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715 "Flag should have been handled and cleared prior to this point"); |
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716 |
0 | 717 // What else? We might try synchronous finalization later. If the total |
718 // space available is large enough for the allocation, then a more | |
719 // complete compaction phase than we've tried so far might be | |
720 // appropriate. | |
721 return NULL; | |
722 } | |
723 | |
724 size_t GenCollectorPolicy::large_typearray_limit() { | |
725 return FastAllocateSizeLimit; | |
726 } | |
727 | |
728 // Return true if any of the following is true: | |
729 // . the allocation won't fit into the current young gen heap | |
730 // . gc locker is occupied (jni critical section) | |
731 // . heap memory is tight -- the most recent previous collection | |
732 // was a full collection because a partial collection (would | |
733 // have) failed and is likely to fail again | |
734 bool GenCollectorPolicy::should_try_older_generation_allocation( | |
735 size_t word_size) const { | |
736 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
737 size_t gen0_capacity = gch->get_gen(0)->capacity_before_gc(); | |
738 return (word_size > heap_word_size(gen0_capacity)) | |
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739 || GC_locker::is_active_and_needs_gc() |
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740 || gch->incremental_collection_failed(); |
0 | 741 } |
742 | |
743 | |
744 // | |
745 // MarkSweepPolicy methods | |
746 // | |
747 | |
748 MarkSweepPolicy::MarkSweepPolicy() { | |
749 initialize_all(); | |
750 } | |
751 | |
752 void MarkSweepPolicy::initialize_generations() { | |
753 initialize_perm_generation(PermGen::MarkSweepCompact); | |
754 _generations = new GenerationSpecPtr[number_of_generations()]; | |
755 if (_generations == NULL) | |
756 vm_exit_during_initialization("Unable to allocate gen spec"); | |
757 | |
758 if (UseParNewGC && ParallelGCThreads > 0) { | |
759 _generations[0] = new GenerationSpec(Generation::ParNew, _initial_gen0_size, _max_gen0_size); | |
760 } else { | |
761 _generations[0] = new GenerationSpec(Generation::DefNew, _initial_gen0_size, _max_gen0_size); | |
762 } | |
763 _generations[1] = new GenerationSpec(Generation::MarkSweepCompact, _initial_gen1_size, _max_gen1_size); | |
764 | |
765 if (_generations[0] == NULL || _generations[1] == NULL) | |
766 vm_exit_during_initialization("Unable to allocate gen spec"); | |
767 } | |
768 | |
769 void MarkSweepPolicy::initialize_gc_policy_counters() { | |
770 // initialize the policy counters - 2 collectors, 3 generations | |
771 if (UseParNewGC && ParallelGCThreads > 0) { | |
772 _gc_policy_counters = new GCPolicyCounters("ParNew:MSC", 2, 3); | |
773 } | |
774 else { | |
775 _gc_policy_counters = new GCPolicyCounters("Copy:MSC", 2, 3); | |
776 } | |
777 } |