Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 20197:ce8f6bb717c9
8042195: Introduce umbrella header orderAccess.inline.hpp.
Reviewed-by: dholmes, kvn, stefank, twisti
author | goetz |
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date | Tue, 29 Apr 2014 15:17:27 +0200 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
12080 | 26 #include "code/nmethod.hpp" |
1972 | 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
29 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
30 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
33 #include "memory/genOopClosures.inline.hpp" | |
34 #include "memory/iterator.hpp" | |
35 #include "oops/oop.inline.hpp" | |
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36 #include "runtime/orderAccess.inline.hpp" |
342 | 37 |
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38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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39 |
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40 int HeapRegion::LogOfHRGrainBytes = 0; |
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41 int HeapRegion::LogOfHRGrainWords = 0; |
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42 size_t HeapRegion::GrainBytes = 0; |
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43 size_t HeapRegion::GrainWords = 0; |
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44 size_t HeapRegion::CardsPerRegion = 0; |
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45 |
342 | 46 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
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47 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 48 CardTableModRefBS::PrecisionStyle precision, |
49 FilterKind fk) : | |
50 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
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51 _hr(hr), _fk(fk), _g1(g1) { } |
342 | 52 |
53 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
54 OopClosure* oc) : | |
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55 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
342 | 56 |
57 template<class ClosureType> | |
58 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
59 HeapRegion* hr, | |
60 HeapWord* cur, HeapWord* top) { | |
61 oop cur_oop = oop(cur); | |
62 int oop_size = cur_oop->size(); | |
63 HeapWord* next_obj = cur + oop_size; | |
64 while (next_obj < top) { | |
65 // Keep filtering the remembered set. | |
66 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
67 // Bottom lies entirely below top, so we can call the | |
68 // non-memRegion version of oop_iterate below. | |
69 cur_oop->oop_iterate(cl); | |
70 } | |
71 cur = next_obj; | |
72 cur_oop = oop(cur); | |
73 oop_size = cur_oop->size(); | |
74 next_obj = cur + oop_size; | |
75 } | |
76 return cur; | |
77 } | |
78 | |
79 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
80 HeapWord* bottom, | |
81 HeapWord* top, | |
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82 ExtendedOopClosure* cl) { |
342 | 83 G1CollectedHeap* g1h = _g1; |
84 int oop_size; | |
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85 ExtendedOopClosure* cl2 = NULL; |
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86 |
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87 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
342 | 88 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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89 |
342 | 90 switch (_fk) { |
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91 case NoFilterKind: cl2 = cl; break; |
342 | 92 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
93 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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94 default: ShouldNotReachHere(); |
342 | 95 } |
96 | |
97 // Start filtering what we add to the remembered set. If the object is | |
98 // not considered dead, either because it is marked (in the mark bitmap) | |
99 // or it was allocated after marking finished, then we add it. Otherwise | |
100 // we can safely ignore the object. | |
101 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
102 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
103 } else { | |
104 oop_size = oop(bottom)->size(); | |
105 } | |
106 | |
107 bottom += oop_size; | |
108 | |
109 if (bottom < top) { | |
110 // We replicate the loop below for several kinds of possible filters. | |
111 switch (_fk) { | |
112 case NoFilterKind: | |
113 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
114 break; | |
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115 |
342 | 116 case IntoCSFilterKind: { |
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117 FilterIntoCSClosure filt(this, g1h, cl); |
342 | 118 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
119 break; | |
120 } | |
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121 |
342 | 122 case OutOfRegionFilterKind: { |
123 FilterOutOfRegionClosure filt(_hr, cl); | |
124 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
125 break; | |
126 } | |
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127 |
342 | 128 default: |
129 ShouldNotReachHere(); | |
130 } | |
131 | |
132 // Last object. Need to do dead-obj filtering here too. | |
133 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
134 oop(bottom)->oop_iterate(cl2, mr); | |
135 } | |
136 } | |
137 } | |
138 | |
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139 // Minimum region size; we won't go lower than that. |
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140 // We might want to decrease this in the future, to deal with small |
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141 // heaps a bit more efficiently. |
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142 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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143 |
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144 // Maximum region size; we don't go higher than that. There's a good |
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145 // reason for having an upper bound. We don't want regions to get too |
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146 // large, otherwise cleanup's effectiveness would decrease as there |
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147 // will be fewer opportunities to find totally empty regions after |
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148 // marking. |
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149 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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150 |
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151 // The automatic region size calculation will try to have around this |
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152 // many regions in the heap (based on the min heap size). |
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153 #define TARGET_REGION_NUMBER 2048 |
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154 |
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155 size_t HeapRegion::max_region_size() { |
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156 return (size_t)MAX_REGION_SIZE; |
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157 } |
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158 |
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159 void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) { |
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160 uintx region_size = G1HeapRegionSize; |
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161 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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162 size_t average_heap_size = (initial_heap_size + max_heap_size) / 2; |
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163 region_size = MAX2(average_heap_size / TARGET_REGION_NUMBER, |
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164 (uintx) MIN_REGION_SIZE); |
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165 } |
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166 |
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167 int region_size_log = log2_long((jlong) region_size); |
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168 // Recalculate the region size to make sure it's a power of |
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169 // 2. This means that region_size is the largest power of 2 that's |
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170 // <= what we've calculated so far. |
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171 region_size = ((uintx)1 << region_size_log); |
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172 |
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173 // Now make sure that we don't go over or under our limits. |
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174 if (region_size < MIN_REGION_SIZE) { |
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175 region_size = MIN_REGION_SIZE; |
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176 } else if (region_size > MAX_REGION_SIZE) { |
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177 region_size = MAX_REGION_SIZE; |
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178 } |
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179 |
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180 // And recalculate the log. |
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181 region_size_log = log2_long((jlong) region_size); |
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182 |
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183 // Now, set up the globals. |
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184 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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185 LogOfHRGrainBytes = region_size_log; |
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186 |
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187 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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188 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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189 |
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190 guarantee(GrainBytes == 0, "we should only set it once"); |
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191 // The cast to int is safe, given that we've bounded region_size by |
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192 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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193 GrainBytes = (size_t)region_size; |
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194 |
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195 guarantee(GrainWords == 0, "we should only set it once"); |
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196 GrainWords = GrainBytes >> LogHeapWordSize; |
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197 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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198 |
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199 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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200 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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201 } |
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202 |
342 | 203 void HeapRegion::reset_after_compaction() { |
204 G1OffsetTableContigSpace::reset_after_compaction(); | |
205 // After a compaction the mark bitmap is invalid, so we must | |
206 // treat all objects as being inside the unmarked area. | |
207 zero_marked_bytes(); | |
208 init_top_at_mark_start(); | |
209 } | |
210 | |
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211 void HeapRegion::hr_clear(bool par, bool clear_space, bool locked) { |
2152 | 212 assert(_humongous_type == NotHumongous, |
213 "we should have already filtered out humongous regions"); | |
214 assert(_humongous_start_region == NULL, | |
215 "we should have already filtered out humongous regions"); | |
216 assert(_end == _orig_end, | |
217 "we should have already filtered out humongous regions"); | |
218 | |
342 | 219 _in_collection_set = false; |
220 | |
221 set_young_index_in_cset(-1); | |
222 uninstall_surv_rate_group(); | |
223 set_young_type(NotYoung); | |
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224 reset_pre_dummy_top(); |
342 | 225 |
226 if (!par) { | |
227 // If this is parallel, this will be done later. | |
228 HeapRegionRemSet* hrrs = rem_set(); | |
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229 if (locked) { |
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230 hrrs->clear_locked(); |
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231 } else { |
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232 hrrs->clear(); |
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233 } |
355 | 234 _claimed = InitialClaimValue; |
342 | 235 } |
236 zero_marked_bytes(); | |
237 | |
238 _offsets.resize(HeapRegion::GrainWords); | |
239 init_top_at_mark_start(); | |
356 | 240 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 241 } |
242 | |
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243 void HeapRegion::par_clear() { |
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244 assert(used() == 0, "the region should have been already cleared"); |
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245 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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246 HeapRegionRemSet* hrrs = rem_set(); |
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247 hrrs->clear(); |
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248 CardTableModRefBS* ct_bs = |
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249 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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250 ct_bs->clear(MemRegion(bottom(), end())); |
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251 } |
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252 |
342 | 253 void HeapRegion::calc_gc_efficiency() { |
6611 | 254 // GC efficiency is the ratio of how much space would be |
255 // reclaimed over how long we predict it would take to reclaim it. | |
342 | 256 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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257 G1CollectorPolicy* g1p = g1h->g1_policy(); |
6611 | 258 |
259 // Retrieve a prediction of the elapsed time for this region for | |
260 // a mixed gc because the region will only be evacuated during a | |
261 // mixed gc. | |
262 double region_elapsed_time_ms = | |
263 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
264 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
342 | 265 } |
266 | |
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267 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 268 assert(!isHumongous(), "sanity / pre-condition"); |
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269 assert(end() == _orig_end, |
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270 "Should be normal before the humongous object allocation"); |
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271 assert(top() == bottom(), "should be empty"); |
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272 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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273 |
355 | 274 _humongous_type = StartsHumongous; |
342 | 275 _humongous_start_region = this; |
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276 |
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277 set_end(new_end); |
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278 _offsets.set_for_starts_humongous(new_top); |
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279 } |
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280 |
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281 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 282 assert(!isHumongous(), "sanity / pre-condition"); |
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283 assert(end() == _orig_end, |
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284 "Should be normal before the humongous object allocation"); |
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285 assert(top() == bottom(), "should be empty"); |
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286 assert(first_hr->startsHumongous(), "pre-condition"); |
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287 |
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288 _humongous_type = ContinuesHumongous; |
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289 _humongous_start_region = first_hr; |
342 | 290 } |
291 | |
2152 | 292 void HeapRegion::set_notHumongous() { |
293 assert(isHumongous(), "pre-condition"); | |
294 | |
295 if (startsHumongous()) { | |
296 assert(top() <= end(), "pre-condition"); | |
297 set_end(_orig_end); | |
298 if (top() > end()) { | |
299 // at least one "continues humongous" region after it | |
300 set_top(end()); | |
301 } | |
302 } else { | |
303 // continues humongous | |
304 assert(end() == _orig_end, "sanity"); | |
305 } | |
306 | |
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307 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
2152 | 308 _humongous_type = NotHumongous; |
309 _humongous_start_region = NULL; | |
310 } | |
311 | |
342 | 312 bool HeapRegion::claimHeapRegion(jint claimValue) { |
313 jint current = _claimed; | |
314 if (current != claimValue) { | |
315 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
316 if (res == current) { | |
317 return true; | |
318 } | |
319 } | |
320 return false; | |
321 } | |
322 | |
323 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
324 HeapWord* low = addr; | |
325 HeapWord* high = end(); | |
326 while (low < high) { | |
327 size_t diff = pointer_delta(high, low); | |
328 // Must add one below to bias toward the high amount. Otherwise, if | |
329 // "high" were at the desired value, and "low" were one less, we | |
330 // would not converge on "high". This is not symmetric, because | |
331 // we set "high" to a block start, which might be the right one, | |
332 // which we don't do for "low". | |
333 HeapWord* middle = low + (diff+1)/2; | |
334 if (middle == high) return high; | |
335 HeapWord* mid_bs = block_start_careful(middle); | |
336 if (mid_bs < addr) { | |
337 low = middle; | |
338 } else { | |
339 high = mid_bs; | |
340 } | |
341 } | |
342 assert(low == high && low >= addr, "Didn't work."); | |
343 return low; | |
344 } | |
345 | |
346 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
347 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
348 #endif // _MSC_VER | |
349 | |
350 | |
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351 HeapRegion::HeapRegion(uint hrs_index, |
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352 G1BlockOffsetSharedArray* sharedOffsetArray, |
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353 MemRegion mr) : |
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354 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
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355 _hrs_index(hrs_index), |
355 | 356 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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357 _in_collection_set(false), |
342 | 358 _next_in_special_set(NULL), _orig_end(NULL), |
355 | 359 _claimed(InitialClaimValue), _evacuation_failed(false), |
6011 | 360 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
342 | 361 _young_type(NotYoung), _next_young_region(NULL), |
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362 _next_dirty_cards_region(NULL), _next(NULL), _prev(NULL), _pending_removal(false), |
2152 | 363 #ifdef ASSERT |
364 _containing_set(NULL), | |
365 #endif // ASSERT | |
366 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
367 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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368 _predicted_bytes_to_copy(0) |
342 | 369 { |
12080 | 370 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
342 | 371 _orig_end = mr.end(); |
372 // Note that initialize() will set the start of the unmarked area of the | |
373 // region. | |
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374 hr_clear(false /*par*/, false /*clear_space*/); |
356 | 375 set_top(bottom()); |
376 set_saved_mark(); | |
342 | 377 |
378 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
379 } | |
380 | |
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381 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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382 // We're not using an iterator given that it will wrap around when |
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383 // it reaches the last region and this is not what we want here. |
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384 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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385 uint index = hrs_index() + 1; |
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386 while (index < g1h->n_regions()) { |
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387 HeapRegion* hr = g1h->region_at(index); |
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388 if (!hr->isHumongous()) { |
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389 return hr; |
342 | 390 } |
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391 index += 1; |
342 | 392 } |
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393 return NULL; |
342 | 394 } |
395 | |
396 void HeapRegion::save_marks() { | |
397 set_saved_mark(); | |
398 } | |
399 | |
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400 void HeapRegion::oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
342 | 401 HeapWord* p = mr.start(); |
402 HeapWord* e = mr.end(); | |
403 oop obj; | |
404 while (p < e) { | |
405 obj = oop(p); | |
406 p += obj->oop_iterate(cl); | |
407 } | |
408 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
409 } | |
410 | |
411 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
412 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
413 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
414 } | |
415 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
416 | |
417 | |
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418 void HeapRegion::oop_before_save_marks_iterate(ExtendedOopClosure* cl) { |
342 | 419 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); |
420 } | |
421 | |
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422 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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423 bool during_conc_mark) { |
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424 // We always recreate the prev marking info and we'll explicitly |
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425 // mark all objects we find to be self-forwarded on the prev |
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426 // bitmap. So all objects need to be below PTAMS. |
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427 _prev_top_at_mark_start = top(); |
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428 _prev_marked_bytes = 0; |
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429 |
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430 if (during_initial_mark) { |
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431 // During initial-mark, we'll also explicitly mark all objects |
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432 // we find to be self-forwarded on the next bitmap. So all |
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433 // objects need to be below NTAMS. |
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434 _next_top_at_mark_start = top(); |
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435 _next_marked_bytes = 0; |
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436 } else if (during_conc_mark) { |
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437 // During concurrent mark, all objects in the CSet (including |
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438 // the ones we find to be self-forwarded) are implicitly live. |
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439 // So all objects need to be above NTAMS. |
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440 _next_top_at_mark_start = bottom(); |
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441 _next_marked_bytes = 0; |
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442 } |
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443 } |
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444 |
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445 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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446 bool during_conc_mark, |
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447 size_t marked_bytes) { |
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448 assert(0 <= marked_bytes && marked_bytes <= used(), |
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449 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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450 marked_bytes, used())); |
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451 _prev_marked_bytes = marked_bytes; |
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452 } |
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453 |
342 | 454 HeapWord* |
455 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
456 ObjectClosure* cl) { | |
457 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
458 // We used to use "block_start_careful" here. But we're actually happy | |
459 // to update the BOT while we do this... | |
460 HeapWord* cur = block_start(mr.start()); | |
461 mr = mr.intersection(used_region()); | |
462 if (mr.is_empty()) return NULL; | |
463 // Otherwise, find the obj that extends onto mr.start(). | |
464 | |
465 assert(cur <= mr.start() | |
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466 && (oop(cur)->klass_or_null() == NULL || |
342 | 467 cur + oop(cur)->size() > mr.start()), |
468 "postcondition of block_start"); | |
469 oop obj; | |
470 while (cur < mr.end()) { | |
471 obj = oop(cur); | |
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472 if (obj->klass_or_null() == NULL) { |
342 | 473 // Ran into an unparseable point. |
474 return cur; | |
475 } else if (!g1h->is_obj_dead(obj)) { | |
476 cl->do_object(obj); | |
477 } | |
478 if (cl->abort()) return cur; | |
479 // The check above must occur before the operation below, since an | |
480 // abort might invalidate the "size" operation. | |
481 cur += obj->size(); | |
482 } | |
483 return NULL; | |
484 } | |
485 | |
486 HeapWord* | |
487 HeapRegion:: | |
488 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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489 FilterOutOfRegionClosure* cl, |
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490 bool filter_young, |
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491 jbyte* card_ptr) { |
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492 // Currently, we should only have to clean the card if filter_young |
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493 // is true and vice versa. |
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494 if (filter_young) { |
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495 assert(card_ptr != NULL, "pre-condition"); |
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496 } else { |
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497 assert(card_ptr == NULL, "pre-condition"); |
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498 } |
342 | 499 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
500 | |
501 // If we're within a stop-world GC, then we might look at a card in a | |
502 // GC alloc region that extends onto a GC LAB, which may not be | |
503 // parseable. Stop such at the "saved_mark" of the region. | |
4839 | 504 if (g1h->is_gc_active()) { |
342 | 505 mr = mr.intersection(used_region_at_save_marks()); |
506 } else { | |
507 mr = mr.intersection(used_region()); | |
508 } | |
509 if (mr.is_empty()) return NULL; | |
510 // Otherwise, find the obj that extends onto mr.start(). | |
511 | |
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512 // The intersection of the incoming mr (for the card) and the |
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513 // allocated part of the region is non-empty. This implies that |
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514 // we have actually allocated into this region. The code in |
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515 // G1CollectedHeap.cpp that allocates a new region sets the |
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516 // is_young tag on the region before allocating. Thus we |
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517 // safely know if this region is young. |
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518 if (is_young() && filter_young) { |
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519 return NULL; |
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520 } |
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521 |
1705 | 522 assert(!is_young(), "check value of filter_young"); |
523 | |
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524 // We can only clean the card here, after we make the decision that |
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525 // the card is not young. And we only clean the card if we have been |
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526 // asked to (i.e., card_ptr != NULL). |
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527 if (card_ptr != NULL) { |
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528 *card_ptr = CardTableModRefBS::clean_card_val(); |
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529 // We must complete this write before we do any of the reads below. |
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530 OrderAccess::storeload(); |
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531 } |
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532 |
4839 | 533 // Cache the boundaries of the memory region in some const locals |
534 HeapWord* const start = mr.start(); | |
535 HeapWord* const end = mr.end(); | |
536 | |
342 | 537 // We used to use "block_start_careful" here. But we're actually happy |
538 // to update the BOT while we do this... | |
4839 | 539 HeapWord* cur = block_start(start); |
540 assert(cur <= start, "Postcondition"); | |
541 | |
542 oop obj; | |
342 | 543 |
4839 | 544 HeapWord* next = cur; |
545 while (next <= start) { | |
546 cur = next; | |
547 obj = oop(cur); | |
548 if (obj->klass_or_null() == NULL) { | |
342 | 549 // Ran into an unparseable point. |
550 return cur; | |
551 } | |
552 // Otherwise... | |
4839 | 553 next = (cur + obj->size()); |
342 | 554 } |
4839 | 555 |
556 // If we finish the above loop...We have a parseable object that | |
557 // begins on or before the start of the memory region, and ends | |
558 // inside or spans the entire region. | |
559 | |
560 assert(obj == oop(cur), "sanity"); | |
561 assert(cur <= start && | |
562 obj->klass_or_null() != NULL && | |
563 (cur + obj->size()) > start, | |
342 | 564 "Loop postcondition"); |
4839 | 565 |
342 | 566 if (!g1h->is_obj_dead(obj)) { |
567 obj->oop_iterate(cl, mr); | |
568 } | |
569 | |
4839 | 570 while (cur < end) { |
342 | 571 obj = oop(cur); |
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572 if (obj->klass_or_null() == NULL) { |
342 | 573 // Ran into an unparseable point. |
574 return cur; | |
575 }; | |
4839 | 576 |
342 | 577 // Otherwise: |
578 next = (cur + obj->size()); | |
4839 | 579 |
342 | 580 if (!g1h->is_obj_dead(obj)) { |
4839 | 581 if (next < end || !obj->is_objArray()) { |
582 // This object either does not span the MemRegion | |
583 // boundary, or if it does it's not an array. | |
584 // Apply closure to whole object. | |
342 | 585 obj->oop_iterate(cl); |
586 } else { | |
4839 | 587 // This obj is an array that spans the boundary. |
588 // Stop at the boundary. | |
589 obj->oop_iterate(cl, mr); | |
342 | 590 } |
591 } | |
592 cur = next; | |
593 } | |
594 return NULL; | |
595 } | |
596 | |
12080 | 597 // Code roots support |
598 | |
599 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
600 HeapRegionRemSet* hrrs = rem_set(); | |
601 hrrs->add_strong_code_root(nm); | |
602 } | |
603 | |
604 void HeapRegion::remove_strong_code_root(nmethod* nm) { | |
605 HeapRegionRemSet* hrrs = rem_set(); | |
606 hrrs->remove_strong_code_root(nm); | |
607 } | |
608 | |
609 void HeapRegion::migrate_strong_code_roots() { | |
610 assert(in_collection_set(), "only collection set regions"); | |
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611 assert(!isHumongous(), |
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612 err_msg("humongous region "HR_FORMAT" should not have been added to collection set", |
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613 HR_FORMAT_PARAMS(this))); |
12080 | 614 |
615 HeapRegionRemSet* hrrs = rem_set(); | |
616 hrrs->migrate_strong_code_roots(); | |
617 } | |
618 | |
619 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
620 HeapRegionRemSet* hrrs = rem_set(); | |
621 hrrs->strong_code_roots_do(blk); | |
622 } | |
623 | |
624 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
625 const HeapRegion* _hr; | |
626 nmethod* _nm; | |
627 bool _failures; | |
628 bool _has_oops_in_region; | |
629 | |
630 template <class T> void do_oop_work(T* p) { | |
631 T heap_oop = oopDesc::load_heap_oop(p); | |
632 if (!oopDesc::is_null(heap_oop)) { | |
633 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
634 | |
635 // Note: not all the oops embedded in the nmethod are in the | |
636 // current region. We only look at those which are. | |
637 if (_hr->is_in(obj)) { | |
638 // Object is in the region. Check that its less than top | |
639 if (_hr->top() <= (HeapWord*)obj) { | |
640 // Object is above top | |
641 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
642 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
643 "top "PTR_FORMAT, | |
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644 (void *)obj, _hr->bottom(), _hr->end(), _hr->top()); |
12080 | 645 _failures = true; |
646 return; | |
647 } | |
648 // Nmethod has at least one oop in the current region | |
649 _has_oops_in_region = true; | |
650 } | |
651 } | |
652 } | |
653 | |
654 public: | |
655 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
656 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
657 | |
658 void do_oop(narrowOop* p) { do_oop_work(p); } | |
659 void do_oop(oop* p) { do_oop_work(p); } | |
660 | |
661 bool failures() { return _failures; } | |
662 bool has_oops_in_region() { return _has_oops_in_region; } | |
663 }; | |
664 | |
665 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
666 const HeapRegion* _hr; | |
667 bool _failures; | |
668 public: | |
669 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
670 _hr(hr), _failures(false) {} | |
671 | |
672 void do_code_blob(CodeBlob* cb) { | |
673 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
674 if (nm != NULL) { | |
675 // Verify that the nemthod is live | |
676 if (!nm->is_alive()) { | |
677 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
678 PTR_FORMAT" in its strong code roots", | |
679 _hr->bottom(), _hr->end(), nm); | |
680 _failures = true; | |
681 } else { | |
682 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
683 nm->oops_do(&oop_cl); | |
684 if (!oop_cl.has_oops_in_region()) { | |
685 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
686 PTR_FORMAT" in its strong code roots " | |
687 "with no pointers into region", | |
688 _hr->bottom(), _hr->end(), nm); | |
689 _failures = true; | |
690 } else if (oop_cl.failures()) { | |
691 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
692 "failures for nmethod "PTR_FORMAT, | |
693 _hr->bottom(), _hr->end(), nm); | |
694 _failures = true; | |
695 } | |
696 } | |
697 } | |
698 } | |
699 | |
700 bool failures() { return _failures; } | |
701 }; | |
702 | |
703 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
704 if (!G1VerifyHeapRegionCodeRoots) { | |
705 // We're not verifying code roots. | |
706 return; | |
707 } | |
708 if (vo == VerifyOption_G1UseMarkWord) { | |
709 // Marking verification during a full GC is performed after class | |
710 // unloading, code cache unloading, etc so the strong code roots | |
711 // attached to each heap region are in an inconsistent state. They won't | |
712 // be consistent until the strong code roots are rebuilt after the | |
713 // actual GC. Skip verifying the strong code roots in this particular | |
714 // time. | |
715 assert(VerifyDuringGC, "only way to get here"); | |
716 return; | |
717 } | |
718 | |
719 HeapRegionRemSet* hrrs = rem_set(); | |
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720 size_t strong_code_roots_length = hrrs->strong_code_roots_list_length(); |
12080 | 721 |
722 // if this region is empty then there should be no entries | |
723 // on its strong code root list | |
724 if (is_empty()) { | |
725 if (strong_code_roots_length > 0) { | |
726 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
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727 "but has "SIZE_FORMAT" code root entries", |
12080 | 728 bottom(), end(), strong_code_roots_length); |
729 *failures = true; | |
730 } | |
731 return; | |
732 } | |
733 | |
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734 if (continuesHumongous()) { |
12080 | 735 if (strong_code_roots_length > 0) { |
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736 gclog_or_tty->print_cr("region "HR_FORMAT" is a continuation of a humongous " |
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737 "region but has "SIZE_FORMAT" code root entries", |
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738 HR_FORMAT_PARAMS(this), strong_code_roots_length); |
12080 | 739 *failures = true; |
740 } | |
741 return; | |
742 } | |
743 | |
744 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
745 strong_code_roots_do(&cb_cl); | |
746 | |
747 if (cb_cl.failures()) { | |
748 *failures = true; | |
749 } | |
750 } | |
751 | |
342 | 752 void HeapRegion::print() const { print_on(gclog_or_tty); } |
753 void HeapRegion::print_on(outputStream* st) const { | |
754 if (isHumongous()) { | |
755 if (startsHumongous()) | |
756 st->print(" HS"); | |
757 else | |
758 st->print(" HC"); | |
759 } else { | |
760 st->print(" "); | |
761 } | |
762 if (in_collection_set()) | |
763 st->print(" CS"); | |
764 else | |
765 st->print(" "); | |
766 if (is_young()) | |
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767 st->print(is_survivor() ? " SU" : " Y "); |
342 | 768 else |
769 st->print(" "); | |
770 if (is_empty()) | |
771 st->print(" F"); | |
772 else | |
773 st->print(" "); | |
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774 st->print(" TS %5d", _gc_time_stamp); |
1388 | 775 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
776 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 777 G1OffsetTableContigSpace::print_on(st); |
778 } | |
779 | |
12080 | 780 class VerifyLiveClosure: public OopClosure { |
781 private: | |
782 G1CollectedHeap* _g1h; | |
783 CardTableModRefBS* _bs; | |
784 oop _containing_obj; | |
785 bool _failures; | |
786 int _n_failures; | |
787 VerifyOption _vo; | |
788 public: | |
789 // _vo == UsePrevMarking -> use "prev" marking information, | |
790 // _vo == UseNextMarking -> use "next" marking information, | |
791 // _vo == UseMarkWord -> use mark word from object header. | |
792 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
793 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
794 _failures(false), _n_failures(0), _vo(vo) | |
795 { | |
796 BarrierSet* bs = _g1h->barrier_set(); | |
797 if (bs->is_a(BarrierSet::CardTableModRef)) | |
798 _bs = (CardTableModRefBS*)bs; | |
799 } | |
800 | |
801 void set_containing_obj(oop obj) { | |
802 _containing_obj = obj; | |
803 } | |
804 | |
805 bool failures() { return _failures; } | |
806 int n_failures() { return _n_failures; } | |
807 | |
808 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
809 virtual void do_oop( oop* p) { do_oop_work(p); } | |
810 | |
811 void print_object(outputStream* out, oop obj) { | |
812 #ifdef PRODUCT | |
813 Klass* k = obj->klass(); | |
814 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
815 out->print_cr("class name %s", class_name); | |
816 #else // PRODUCT | |
817 obj->print_on(out); | |
818 #endif // PRODUCT | |
819 } | |
820 | |
821 template <class T> | |
822 void do_oop_work(T* p) { | |
823 assert(_containing_obj != NULL, "Precondition"); | |
824 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
825 "Precondition"); | |
826 T heap_oop = oopDesc::load_heap_oop(p); | |
827 if (!oopDesc::is_null(heap_oop)) { | |
828 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
829 bool failed = false; | |
830 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
831 MutexLockerEx x(ParGCRareEvent_lock, | |
832 Mutex::_no_safepoint_check_flag); | |
833 | |
834 if (!_failures) { | |
17937
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835 gclog_or_tty->cr(); |
12080 | 836 gclog_or_tty->print_cr("----------"); |
837 } | |
838 if (!_g1h->is_in_closed_subset(obj)) { | |
839 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
840 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
841 " of live obj "PTR_FORMAT" in region " | |
842 "["PTR_FORMAT", "PTR_FORMAT")", | |
843 p, (void*) _containing_obj, | |
844 from->bottom(), from->end()); | |
845 print_object(gclog_or_tty, _containing_obj); | |
846 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
847 (void*) obj); | |
848 } else { | |
849 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
850 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
851 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
852 " of live obj "PTR_FORMAT" in region " | |
853 "["PTR_FORMAT", "PTR_FORMAT")", | |
854 p, (void*) _containing_obj, | |
855 from->bottom(), from->end()); | |
856 print_object(gclog_or_tty, _containing_obj); | |
857 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
858 "["PTR_FORMAT", "PTR_FORMAT")", | |
859 (void*) obj, to->bottom(), to->end()); | |
860 print_object(gclog_or_tty, obj); | |
861 } | |
862 gclog_or_tty->print_cr("----------"); | |
863 gclog_or_tty->flush(); | |
864 _failures = true; | |
865 failed = true; | |
866 _n_failures++; | |
867 } | |
868 | |
869 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
870 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
871 HeapRegion* to = _g1h->heap_region_containing(obj); | |
872 if (from != NULL && to != NULL && | |
873 from != to && | |
874 !to->isHumongous()) { | |
875 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
876 jbyte cv_field = *_bs->byte_for_const(p); | |
877 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
878 | |
879 bool is_bad = !(from->is_young() | |
880 || to->rem_set()->contains_reference(p) | |
881 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
882 (_containing_obj->is_objArray() ? | |
883 cv_field == dirty | |
884 : cv_obj == dirty || cv_field == dirty)); | |
885 if (is_bad) { | |
886 MutexLockerEx x(ParGCRareEvent_lock, | |
887 Mutex::_no_safepoint_check_flag); | |
888 | |
889 if (!_failures) { | |
17937
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890 gclog_or_tty->cr(); |
12080 | 891 gclog_or_tty->print_cr("----------"); |
892 } | |
893 gclog_or_tty->print_cr("Missing rem set entry:"); | |
894 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
895 "of obj "PTR_FORMAT", " | |
896 "in region "HR_FORMAT, | |
897 p, (void*) _containing_obj, | |
898 HR_FORMAT_PARAMS(from)); | |
899 _containing_obj->print_on(gclog_or_tty); | |
900 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
901 "in region "HR_FORMAT, | |
902 (void*) obj, | |
903 HR_FORMAT_PARAMS(to)); | |
904 obj->print_on(gclog_or_tty); | |
905 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
906 cv_obj, cv_field); | |
907 gclog_or_tty->print_cr("----------"); | |
908 gclog_or_tty->flush(); | |
909 _failures = true; | |
910 if (!failed) _n_failures++; | |
911 } | |
912 } | |
913 } | |
914 } | |
915 } | |
916 }; | |
811 | 917 |
342 | 918 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
919 // We would need a mechanism to make that code skip dead objects. | |
920 | |
6008 | 921 void HeapRegion::verify(VerifyOption vo, |
1020
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922 bool* failures) const { |
342 | 923 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
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924 *failures = false; |
342 | 925 HeapWord* p = bottom(); |
926 HeapWord* prev_p = NULL; | |
3772
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|
927 VerifyLiveClosure vl_cl(g1, vo); |
1718
bb847e31b836
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928 bool is_humongous = isHumongous(); |
2133
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929 bool do_bot_verify = !is_young(); |
1718
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930 size_t object_num = 0; |
342 | 931 while (p < top()) { |
2133
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diff
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|
932 oop obj = oop(p); |
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1972
diff
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933 size_t obj_size = obj->size(); |
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934 object_num += 1; |
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|
935 |
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936 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
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937 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
bb847e31b836
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diff
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|
938 SIZE_FORMAT" words) in a %shumongous region", |
2133
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939 p, g1->isHumongous(obj_size) ? "" : "non-", |
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940 obj_size, is_humongous ? "" : "non-"); |
1718
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|
941 *failures = true; |
2133
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1972
diff
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|
942 return; |
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1972
diff
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|
943 } |
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diff
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|
944 |
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945 // If it returns false, verify_for_object() will output the |
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diff
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|
946 // appropriate messasge. |
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947 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
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|
948 *failures = true; |
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|
949 return; |
1718
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diff
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|
950 } |
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|
951 |
3772
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|
952 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
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953 if (obj->is_oop()) { |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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954 Klass* klass = obj->klass(); |
11034 | 955 if (!klass->is_metaspace_object()) { |
2133
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diff
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|
956 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
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12233
diff
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|
957 "not metadata", klass, (void *)obj); |
2133
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|
958 *failures = true; |
2250ee17e258
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|
959 return; |
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1972
diff
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|
960 } else if (!klass->is_klass()) { |
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|
961 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
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12233
diff
changeset
|
962 "not a klass", klass, (void *)obj); |
2133
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diff
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|
963 *failures = true; |
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1972
diff
changeset
|
964 return; |
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1972
diff
changeset
|
965 } else { |
2250ee17e258
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diff
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|
966 vl_cl.set_containing_obj(obj); |
6725
da91efe96a93
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6611
diff
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|
967 obj->oop_iterate_no_header(&vl_cl); |
2133
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1972
diff
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|
968 if (vl_cl.failures()) { |
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parents:
1972
diff
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|
969 *failures = true; |
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1972
diff
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|
970 } |
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1972
diff
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|
971 if (G1MaxVerifyFailures >= 0 && |
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1972
diff
changeset
|
972 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
973 return; |
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tonyp
parents:
1972
diff
changeset
|
974 } |
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1972
diff
changeset
|
975 } |
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diff
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|
976 } else { |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
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12233
diff
changeset
|
977 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", (void *)obj); |
1020
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6882730: G1: parallel heap verification messes up region dump
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942
diff
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|
978 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
979 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
942
diff
changeset
|
980 } |
342 | 981 } |
982 prev_p = p; | |
2133
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|
983 p += obj_size; |
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1972
diff
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|
984 } |
2250ee17e258
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diff
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|
985 |
2250ee17e258
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1972
diff
changeset
|
986 if (p != top()) { |
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diff
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|
987 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
2250ee17e258
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1972
diff
changeset
|
988 "does not match top "PTR_FORMAT, p, top()); |
2250ee17e258
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parents:
1972
diff
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|
989 *failures = true; |
2250ee17e258
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1972
diff
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|
990 return; |
342 | 991 } |
2133
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diff
changeset
|
992 |
2250ee17e258
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1972
diff
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|
993 HeapWord* the_end = end(); |
2250ee17e258
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1972
diff
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|
994 assert(p == top(), "it should still hold"); |
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1972
diff
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|
995 // Do some extra BOT consistency checking for addresses in the |
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diff
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|
996 // range [top, end). BOT look-ups in this range should yield |
2250ee17e258
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diff
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|
997 // top. No point in doing that if top == end (there's nothing there). |
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1972
diff
changeset
|
998 if (p < the_end) { |
2250ee17e258
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parents:
1972
diff
changeset
|
999 // Look up top |
2250ee17e258
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1972
diff
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|
1000 HeapWord* addr_1 = p; |
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diff
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|
1001 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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parents:
1972
diff
changeset
|
1002 if (b_start_1 != p) { |
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parents:
1972
diff
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|
1003 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
2250ee17e258
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1972
diff
changeset
|
1004 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
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1972
diff
changeset
|
1005 addr_1, b_start_1, p); |
2250ee17e258
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diff
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|
1006 *failures = true; |
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1972
diff
changeset
|
1007 return; |
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1972
diff
changeset
|
1008 } |
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diff
changeset
|
1009 |
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diff
changeset
|
1010 // Look up top + 1 |
2250ee17e258
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diff
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|
1011 HeapWord* addr_2 = p + 1; |
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diff
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|
1012 if (addr_2 < the_end) { |
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diff
changeset
|
1013 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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diff
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|
1014 if (b_start_2 != p) { |
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diff
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|
1015 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
2250ee17e258
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diff
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|
1016 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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diff
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|
1017 addr_2, b_start_2, p); |
1020
ff2402f6a50b
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942
diff
changeset
|
1018 *failures = true; |
ff2402f6a50b
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942
diff
changeset
|
1019 return; |
2133
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diff
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|
1020 } |
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changeset
|
1021 } |
2250ee17e258
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diff
changeset
|
1022 |
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1972
diff
changeset
|
1023 // Look up an address between top and end |
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diff
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|
1024 size_t diff = pointer_delta(the_end, p) / 2; |
2250ee17e258
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diff
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|
1025 HeapWord* addr_3 = p + diff; |
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parents:
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diff
changeset
|
1026 if (addr_3 < the_end) { |
2250ee17e258
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diff
changeset
|
1027 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
2250ee17e258
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tonyp
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1972
diff
changeset
|
1028 if (b_start_3 != p) { |
2250ee17e258
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parents:
1972
diff
changeset
|
1029 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1030 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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parents:
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1031 addr_3, b_start_3, p); |
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1032 *failures = true; |
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1033 return; |
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1034 } |
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1035 } |
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1036 |
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1037 // Loook up end - 1 |
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1038 HeapWord* addr_4 = the_end - 1; |
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1039 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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1040 if (b_start_4 != p) { |
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1041 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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1042 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1043 addr_4, b_start_4, p); |
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1044 *failures = true; |
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1045 return; |
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1046 } |
342 | 1047 } |
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1048 |
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1049 if (is_humongous && object_num > 1) { |
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1050 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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1051 "but has "SIZE_FORMAT", objects", |
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1052 bottom(), end(), object_num); |
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1053 *failures = true; |
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1054 return; |
342 | 1055 } |
12080 | 1056 |
1057 verify_strong_code_roots(vo, failures); | |
1058 } | |
1059 | |
1060 void HeapRegion::verify() const { | |
1061 bool dummy = false; | |
1062 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); | |
342 | 1063 } |
1064 | |
1065 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
1066 // away eventually. | |
1067 | |
356 | 1068 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
1069 ContiguousSpace::clear(mangle_space); | |
342 | 1070 _offsets.zero_bottom_entry(); |
1071 _offsets.initialize_threshold(); | |
1072 } | |
1073 | |
1074 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
1075 Space::set_bottom(new_bottom); | |
1076 _offsets.set_bottom(new_bottom); | |
1077 } | |
1078 | |
1079 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
1080 Space::set_end(new_end); | |
1081 _offsets.resize(new_end - bottom()); | |
1082 } | |
1083 | |
1084 void G1OffsetTableContigSpace::print() const { | |
1085 print_short(); | |
1086 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
1087 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
1088 bottom(), top(), _offsets.threshold(), end()); | |
1089 } | |
1090 | |
1091 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
1092 return _offsets.initialize_threshold(); | |
1093 } | |
1094 | |
1095 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
1096 HeapWord* end) { | |
1097 _offsets.alloc_block(start, end); | |
1098 return _offsets.threshold(); | |
1099 } | |
1100 | |
1101 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
1102 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1103 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
1104 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
1105 return top(); | |
1106 else | |
1107 return ContiguousSpace::saved_mark_word(); | |
1108 } | |
1109 | |
1110 void G1OffsetTableContigSpace::set_saved_mark() { | |
1111 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1112 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
1113 | |
1114 if (_gc_time_stamp < curr_gc_time_stamp) { | |
1115 // The order of these is important, as another thread might be | |
1116 // about to start scanning this region. If it does so after | |
1117 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
1118 // will be false, and it will pick up top() as the high water mark | |
1119 // of region. If it does so after _gc_time_stamp = ..., then it | |
1120 // will pick up the right saved_mark_word() as the high water mark | |
1121 // of the region. Either way, the behaviour will be correct. | |
1122 ContiguousSpace::set_saved_mark(); | |
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1123 OrderAccess::storestore(); |
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1124 _gc_time_stamp = curr_gc_time_stamp; |
2433
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1125 // No need to do another barrier to flush the writes above. If |
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1126 // this is called in parallel with other threads trying to |
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1127 // allocate into the region, the caller should call this while |
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1128 // holding a lock and when the lock is released the writes will be |
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1129 // flushed. |
342 | 1130 } |
1131 } | |
1132 | |
1133 G1OffsetTableContigSpace:: | |
1134 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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1135 MemRegion mr) : |
342 | 1136 _offsets(sharedOffsetArray, mr), |
1137 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
1138 _gc_time_stamp(0) | |
1139 { | |
1140 _offsets.set_space(this); | |
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1141 // false ==> we'll do the clearing if there's clearing to be done. |
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1142 ContiguousSpace::initialize(mr, false, SpaceDecorator::Mangle); |
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1143 _offsets.zero_bottom_entry(); |
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1144 _offsets.initialize_threshold(); |
342 | 1145 } |