Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 20336:6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
Summary: Let HeapRegionSeq manage the heap region and auxiliary data to decrease the amount of responsibilities of G1CollectedHeap, and encapsulate this work from other code.
Reviewed-by: jwilhelm, jmasa, mgerdin, brutisso
author | tschatzl |
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date | Tue, 19 Aug 2014 10:50:27 +0200 |
parents | 3f2894c5052e |
children | a8ea2f110d87 |
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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" | |
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33 #include "gc_implementation/shared/liveRange.hpp" |
1972 | 34 #include "memory/genOopClosures.inline.hpp" |
35 #include "memory/iterator.hpp" | |
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36 #include "memory/space.inline.hpp" |
1972 | 37 #include "oops/oop.inline.hpp" |
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38 #include "runtime/orderAccess.inline.hpp" |
342 | 39 |
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40 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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41 |
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42 int HeapRegion::LogOfHRGrainBytes = 0; |
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43 int HeapRegion::LogOfHRGrainWords = 0; |
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44 size_t HeapRegion::GrainBytes = 0; |
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45 size_t HeapRegion::GrainWords = 0; |
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46 size_t HeapRegion::CardsPerRegion = 0; |
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47 |
342 | 48 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
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49 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 50 CardTableModRefBS::PrecisionStyle precision, |
51 FilterKind fk) : | |
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52 DirtyCardToOopClosure(hr, cl, precision, NULL), |
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53 _hr(hr), _fk(fk), _g1(g1) { } |
342 | 54 |
55 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
56 OopClosure* oc) : | |
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57 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
342 | 58 |
59 template<class ClosureType> | |
60 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
61 HeapRegion* hr, | |
62 HeapWord* cur, HeapWord* top) { | |
63 oop cur_oop = oop(cur); | |
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64 size_t oop_size = hr->block_size(cur); |
342 | 65 HeapWord* next_obj = cur + oop_size; |
66 while (next_obj < top) { | |
67 // Keep filtering the remembered set. | |
68 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
69 // Bottom lies entirely below top, so we can call the | |
70 // non-memRegion version of oop_iterate below. | |
71 cur_oop->oop_iterate(cl); | |
72 } | |
73 cur = next_obj; | |
74 cur_oop = oop(cur); | |
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75 oop_size = hr->block_size(cur); |
342 | 76 next_obj = cur + oop_size; |
77 } | |
78 return cur; | |
79 } | |
80 | |
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81 void HeapRegionDCTOC::walk_mem_region(MemRegion mr, |
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82 HeapWord* bottom, |
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83 HeapWord* top) { |
342 | 84 G1CollectedHeap* g1h = _g1; |
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85 size_t oop_size; |
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86 ExtendedOopClosure* cl2 = NULL; |
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87 |
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88 FilterIntoCSClosure intoCSFilt(this, g1h, _cl); |
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89 FilterOutOfRegionClosure outOfRegionFilt(_hr, _cl); |
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90 |
342 | 91 switch (_fk) { |
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92 case NoFilterKind: cl2 = _cl; break; |
342 | 93 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
94 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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95 default: ShouldNotReachHere(); |
342 | 96 } |
97 | |
98 // Start filtering what we add to the remembered set. If the object is | |
99 // not considered dead, either because it is marked (in the mark bitmap) | |
100 // or it was allocated after marking finished, then we add it. Otherwise | |
101 // we can safely ignore the object. | |
102 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
103 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
104 } else { | |
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105 oop_size = _hr->block_size(bottom); |
342 | 106 } |
107 | |
108 bottom += oop_size; | |
109 | |
110 if (bottom < top) { | |
111 // We replicate the loop below for several kinds of possible filters. | |
112 switch (_fk) { | |
113 case NoFilterKind: | |
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114 bottom = walk_mem_region_loop(_cl, g1h, _hr, bottom, top); |
342 | 115 break; |
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116 |
342 | 117 case IntoCSFilterKind: { |
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118 FilterIntoCSClosure filt(this, g1h, _cl); |
342 | 119 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
120 break; | |
121 } | |
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122 |
342 | 123 case OutOfRegionFilterKind: { |
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124 FilterOutOfRegionClosure filt(_hr, _cl); |
342 | 125 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
126 break; | |
127 } | |
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128 |
342 | 129 default: |
130 ShouldNotReachHere(); | |
131 } | |
132 | |
133 // Last object. Need to do dead-obj filtering here too. | |
134 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
135 oop(bottom)->oop_iterate(cl2, mr); | |
136 } | |
137 } | |
138 } | |
139 | |
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140 // Minimum region size; we won't go lower than that. |
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141 // We might want to decrease this in the future, to deal with small |
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142 // heaps a bit more efficiently. |
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143 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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144 |
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145 // Maximum region size; we don't go higher than that. There's a good |
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146 // reason for having an upper bound. We don't want regions to get too |
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147 // large, otherwise cleanup's effectiveness would decrease as there |
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148 // will be fewer opportunities to find totally empty regions after |
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149 // marking. |
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150 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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151 |
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152 // The automatic region size calculation will try to have around this |
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153 // many regions in the heap (based on the min heap size). |
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154 #define TARGET_REGION_NUMBER 2048 |
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155 |
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156 size_t HeapRegion::max_region_size() { |
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157 return (size_t)MAX_REGION_SIZE; |
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158 } |
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159 |
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160 void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) { |
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161 uintx region_size = G1HeapRegionSize; |
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162 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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163 size_t average_heap_size = (initial_heap_size + max_heap_size) / 2; |
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164 region_size = MAX2(average_heap_size / TARGET_REGION_NUMBER, |
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165 (uintx) MIN_REGION_SIZE); |
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166 } |
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167 |
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168 int region_size_log = log2_long((jlong) region_size); |
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169 // Recalculate the region size to make sure it's a power of |
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170 // 2. This means that region_size is the largest power of 2 that's |
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171 // <= what we've calculated so far. |
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172 region_size = ((uintx)1 << region_size_log); |
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173 |
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174 // Now make sure that we don't go over or under our limits. |
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175 if (region_size < MIN_REGION_SIZE) { |
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176 region_size = MIN_REGION_SIZE; |
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177 } else if (region_size > MAX_REGION_SIZE) { |
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178 region_size = MAX_REGION_SIZE; |
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179 } |
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180 |
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181 // And recalculate the log. |
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182 region_size_log = log2_long((jlong) region_size); |
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183 |
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184 // Now, set up the globals. |
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185 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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186 LogOfHRGrainBytes = region_size_log; |
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187 |
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188 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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189 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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190 |
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191 guarantee(GrainBytes == 0, "we should only set it once"); |
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192 // The cast to int is safe, given that we've bounded region_size by |
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193 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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194 GrainBytes = (size_t)region_size; |
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195 |
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196 guarantee(GrainWords == 0, "we should only set it once"); |
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197 GrainWords = GrainBytes >> LogHeapWordSize; |
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198 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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199 |
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200 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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201 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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202 } |
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203 |
342 | 204 void HeapRegion::reset_after_compaction() { |
205 G1OffsetTableContigSpace::reset_after_compaction(); | |
206 // After a compaction the mark bitmap is invalid, so we must | |
207 // treat all objects as being inside the unmarked area. | |
208 zero_marked_bytes(); | |
209 init_top_at_mark_start(); | |
210 } | |
211 | |
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212 void HeapRegion::hr_clear(bool par, bool clear_space, bool locked) { |
2152 | 213 assert(_humongous_type == NotHumongous, |
214 "we should have already filtered out humongous regions"); | |
215 assert(_humongous_start_region == NULL, | |
216 "we should have already filtered out humongous regions"); | |
217 assert(_end == _orig_end, | |
218 "we should have already filtered out humongous regions"); | |
219 | |
342 | 220 _in_collection_set = false; |
221 | |
222 set_young_index_in_cset(-1); | |
223 uninstall_surv_rate_group(); | |
224 set_young_type(NotYoung); | |
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225 reset_pre_dummy_top(); |
342 | 226 |
227 if (!par) { | |
228 // If this is parallel, this will be done later. | |
229 HeapRegionRemSet* hrrs = rem_set(); | |
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230 if (locked) { |
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231 hrrs->clear_locked(); |
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232 } else { |
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233 hrrs->clear(); |
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234 } |
355 | 235 _claimed = InitialClaimValue; |
342 | 236 } |
237 zero_marked_bytes(); | |
238 | |
239 _offsets.resize(HeapRegion::GrainWords); | |
240 init_top_at_mark_start(); | |
356 | 241 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 242 } |
243 | |
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244 void HeapRegion::par_clear() { |
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245 assert(used() == 0, "the region should have been already cleared"); |
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246 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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247 HeapRegionRemSet* hrrs = rem_set(); |
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248 hrrs->clear(); |
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249 CardTableModRefBS* ct_bs = |
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250 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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251 ct_bs->clear(MemRegion(bottom(), end())); |
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252 } |
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253 |
342 | 254 void HeapRegion::calc_gc_efficiency() { |
6611 | 255 // GC efficiency is the ratio of how much space would be |
256 // reclaimed over how long we predict it would take to reclaim it. | |
342 | 257 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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258 G1CollectorPolicy* g1p = g1h->g1_policy(); |
6611 | 259 |
260 // Retrieve a prediction of the elapsed time for this region for | |
261 // a mixed gc because the region will only be evacuated during a | |
262 // mixed gc. | |
263 double region_elapsed_time_ms = | |
264 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
265 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
342 | 266 } |
267 | |
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268 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 269 assert(!isHumongous(), "sanity / pre-condition"); |
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270 assert(end() == _orig_end, |
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271 "Should be normal before the humongous object allocation"); |
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272 assert(top() == bottom(), "should be empty"); |
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273 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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274 |
355 | 275 _humongous_type = StartsHumongous; |
342 | 276 _humongous_start_region = this; |
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277 |
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278 set_end(new_end); |
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279 _offsets.set_for_starts_humongous(new_top); |
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280 } |
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281 |
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282 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 283 assert(!isHumongous(), "sanity / pre-condition"); |
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284 assert(end() == _orig_end, |
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285 "Should be normal before the humongous object allocation"); |
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286 assert(top() == bottom(), "should be empty"); |
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287 assert(first_hr->startsHumongous(), "pre-condition"); |
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288 |
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289 _humongous_type = ContinuesHumongous; |
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290 _humongous_start_region = first_hr; |
342 | 291 } |
292 | |
2152 | 293 void HeapRegion::set_notHumongous() { |
294 assert(isHumongous(), "pre-condition"); | |
295 | |
296 if (startsHumongous()) { | |
297 assert(top() <= end(), "pre-condition"); | |
298 set_end(_orig_end); | |
299 if (top() > end()) { | |
300 // at least one "continues humongous" region after it | |
301 set_top(end()); | |
302 } | |
303 } else { | |
304 // continues humongous | |
305 assert(end() == _orig_end, "sanity"); | |
306 } | |
307 | |
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308 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
2152 | 309 _humongous_type = NotHumongous; |
310 _humongous_start_region = NULL; | |
311 } | |
312 | |
342 | 313 bool HeapRegion::claimHeapRegion(jint claimValue) { |
314 jint current = _claimed; | |
315 if (current != claimValue) { | |
316 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
317 if (res == current) { | |
318 return true; | |
319 } | |
320 } | |
321 return false; | |
322 } | |
323 | |
324 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
325 HeapWord* low = addr; | |
326 HeapWord* high = end(); | |
327 while (low < high) { | |
328 size_t diff = pointer_delta(high, low); | |
329 // Must add one below to bias toward the high amount. Otherwise, if | |
330 // "high" were at the desired value, and "low" were one less, we | |
331 // would not converge on "high". This is not symmetric, because | |
332 // we set "high" to a block start, which might be the right one, | |
333 // which we don't do for "low". | |
334 HeapWord* middle = low + (diff+1)/2; | |
335 if (middle == high) return high; | |
336 HeapWord* mid_bs = block_start_careful(middle); | |
337 if (mid_bs < addr) { | |
338 low = middle; | |
339 } else { | |
340 high = mid_bs; | |
341 } | |
342 } | |
343 assert(low == high && low >= addr, "Didn't work."); | |
344 return low; | |
345 } | |
346 | |
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347 HeapRegion::HeapRegion(uint hrs_index, |
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348 G1BlockOffsetSharedArray* sharedOffsetArray, |
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349 MemRegion mr) : |
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350 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
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351 _hrs_index(hrs_index), |
355 | 352 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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353 _in_collection_set(false), |
342 | 354 _next_in_special_set(NULL), _orig_end(NULL), |
355 | 355 _claimed(InitialClaimValue), _evacuation_failed(false), |
6011 | 356 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
342 | 357 _young_type(NotYoung), _next_young_region(NULL), |
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358 _next_dirty_cards_region(NULL), _next(NULL), _prev(NULL), |
2152 | 359 #ifdef ASSERT |
360 _containing_set(NULL), | |
361 #endif // ASSERT | |
362 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
363 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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364 _predicted_bytes_to_copy(0) |
342 | 365 { |
12080 | 366 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
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367 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); |
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368 |
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369 initialize(mr); |
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370 } |
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371 |
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372 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
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373 assert(_rem_set->is_empty(), "Remembered set must be empty"); |
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374 |
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375 G1OffsetTableContigSpace::initialize(mr, clear_space, mangle_space); |
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376 |
342 | 377 _orig_end = mr.end(); |
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378 hr_clear(false /*par*/, false /*clear_space*/); |
356 | 379 set_top(bottom()); |
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380 record_top_and_timestamp(); |
342 | 381 } |
382 | |
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383 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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384 return G1CollectedHeap::heap()->next_compaction_region(this); |
342 | 385 } |
386 | |
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387 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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388 bool during_conc_mark) { |
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389 // We always recreate the prev marking info and we'll explicitly |
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390 // mark all objects we find to be self-forwarded on the prev |
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391 // bitmap. So all objects need to be below PTAMS. |
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392 _prev_marked_bytes = 0; |
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393 |
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394 if (during_initial_mark) { |
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395 // During initial-mark, we'll also explicitly mark all objects |
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396 // we find to be self-forwarded on the next bitmap. So all |
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397 // objects need to be below NTAMS. |
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398 _next_top_at_mark_start = top(); |
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399 _next_marked_bytes = 0; |
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400 } else if (during_conc_mark) { |
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401 // During concurrent mark, all objects in the CSet (including |
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402 // the ones we find to be self-forwarded) are implicitly live. |
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403 // So all objects need to be above NTAMS. |
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404 _next_top_at_mark_start = bottom(); |
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405 _next_marked_bytes = 0; |
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406 } |
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407 } |
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408 |
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409 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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410 bool during_conc_mark, |
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411 size_t marked_bytes) { |
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412 assert(0 <= marked_bytes && marked_bytes <= used(), |
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413 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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414 marked_bytes, used())); |
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415 _prev_top_at_mark_start = top(); |
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416 _prev_marked_bytes = marked_bytes; |
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417 } |
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418 |
342 | 419 HeapWord* |
420 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
421 ObjectClosure* cl) { | |
422 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
423 // We used to use "block_start_careful" here. But we're actually happy | |
424 // to update the BOT while we do this... | |
425 HeapWord* cur = block_start(mr.start()); | |
426 mr = mr.intersection(used_region()); | |
427 if (mr.is_empty()) return NULL; | |
428 // Otherwise, find the obj that extends onto mr.start(). | |
429 | |
430 assert(cur <= mr.start() | |
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431 && (oop(cur)->klass_or_null() == NULL || |
342 | 432 cur + oop(cur)->size() > mr.start()), |
433 "postcondition of block_start"); | |
434 oop obj; | |
435 while (cur < mr.end()) { | |
436 obj = oop(cur); | |
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437 if (obj->klass_or_null() == NULL) { |
342 | 438 // Ran into an unparseable point. |
439 return cur; | |
440 } else if (!g1h->is_obj_dead(obj)) { | |
441 cl->do_object(obj); | |
442 } | |
443 if (cl->abort()) return cur; | |
444 // The check above must occur before the operation below, since an | |
445 // abort might invalidate the "size" operation. | |
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446 cur += block_size(cur); |
342 | 447 } |
448 return NULL; | |
449 } | |
450 | |
451 HeapWord* | |
452 HeapRegion:: | |
453 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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454 FilterOutOfRegionClosure* cl, |
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455 bool filter_young, |
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456 jbyte* card_ptr) { |
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457 // Currently, we should only have to clean the card if filter_young |
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458 // is true and vice versa. |
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459 if (filter_young) { |
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460 assert(card_ptr != NULL, "pre-condition"); |
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461 } else { |
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462 assert(card_ptr == NULL, "pre-condition"); |
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463 } |
342 | 464 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
465 | |
466 // If we're within a stop-world GC, then we might look at a card in a | |
467 // GC alloc region that extends onto a GC LAB, which may not be | |
468 // parseable. Stop such at the "saved_mark" of the region. | |
4839 | 469 if (g1h->is_gc_active()) { |
342 | 470 mr = mr.intersection(used_region_at_save_marks()); |
471 } else { | |
472 mr = mr.intersection(used_region()); | |
473 } | |
474 if (mr.is_empty()) return NULL; | |
475 // Otherwise, find the obj that extends onto mr.start(). | |
476 | |
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477 // The intersection of the incoming mr (for the card) and the |
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478 // allocated part of the region is non-empty. This implies that |
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479 // we have actually allocated into this region. The code in |
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480 // G1CollectedHeap.cpp that allocates a new region sets the |
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481 // is_young tag on the region before allocating. Thus we |
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482 // safely know if this region is young. |
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483 if (is_young() && filter_young) { |
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484 return NULL; |
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485 } |
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486 |
1705 | 487 assert(!is_young(), "check value of filter_young"); |
488 | |
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489 // We can only clean the card here, after we make the decision that |
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490 // the card is not young. And we only clean the card if we have been |
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491 // asked to (i.e., card_ptr != NULL). |
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492 if (card_ptr != NULL) { |
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493 *card_ptr = CardTableModRefBS::clean_card_val(); |
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494 // We must complete this write before we do any of the reads below. |
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495 OrderAccess::storeload(); |
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496 } |
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497 |
4839 | 498 // Cache the boundaries of the memory region in some const locals |
499 HeapWord* const start = mr.start(); | |
500 HeapWord* const end = mr.end(); | |
501 | |
342 | 502 // We used to use "block_start_careful" here. But we're actually happy |
503 // to update the BOT while we do this... | |
4839 | 504 HeapWord* cur = block_start(start); |
505 assert(cur <= start, "Postcondition"); | |
506 | |
507 oop obj; | |
342 | 508 |
4839 | 509 HeapWord* next = cur; |
510 while (next <= start) { | |
511 cur = next; | |
512 obj = oop(cur); | |
513 if (obj->klass_or_null() == NULL) { | |
342 | 514 // Ran into an unparseable point. |
515 return cur; | |
516 } | |
517 // Otherwise... | |
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518 next = cur + block_size(cur); |
342 | 519 } |
4839 | 520 |
521 // If we finish the above loop...We have a parseable object that | |
522 // begins on or before the start of the memory region, and ends | |
523 // inside or spans the entire region. | |
524 | |
525 assert(obj == oop(cur), "sanity"); | |
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526 assert(cur <= start, "Loop postcondition"); |
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527 assert(obj->klass_or_null() != NULL, "Loop postcondition"); |
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528 assert((cur + block_size(cur)) > start, "Loop postcondition"); |
4839 | 529 |
342 | 530 if (!g1h->is_obj_dead(obj)) { |
531 obj->oop_iterate(cl, mr); | |
532 } | |
533 | |
4839 | 534 while (cur < end) { |
342 | 535 obj = oop(cur); |
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536 if (obj->klass_or_null() == NULL) { |
342 | 537 // Ran into an unparseable point. |
538 return cur; | |
539 }; | |
4839 | 540 |
342 | 541 // Otherwise: |
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542 next = cur + block_size(cur); |
4839 | 543 |
342 | 544 if (!g1h->is_obj_dead(obj)) { |
4839 | 545 if (next < end || !obj->is_objArray()) { |
546 // This object either does not span the MemRegion | |
547 // boundary, or if it does it's not an array. | |
548 // Apply closure to whole object. | |
342 | 549 obj->oop_iterate(cl); |
550 } else { | |
4839 | 551 // This obj is an array that spans the boundary. |
552 // Stop at the boundary. | |
553 obj->oop_iterate(cl, mr); | |
342 | 554 } |
555 } | |
556 cur = next; | |
557 } | |
558 return NULL; | |
559 } | |
560 | |
12080 | 561 // Code roots support |
562 | |
563 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
564 HeapRegionRemSet* hrrs = rem_set(); | |
565 hrrs->add_strong_code_root(nm); | |
566 } | |
567 | |
568 void HeapRegion::remove_strong_code_root(nmethod* nm) { | |
569 HeapRegionRemSet* hrrs = rem_set(); | |
570 hrrs->remove_strong_code_root(nm); | |
571 } | |
572 | |
573 void HeapRegion::migrate_strong_code_roots() { | |
574 assert(in_collection_set(), "only collection set regions"); | |
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575 assert(!isHumongous(), |
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576 err_msg("humongous region "HR_FORMAT" should not have been added to collection set", |
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577 HR_FORMAT_PARAMS(this))); |
12080 | 578 |
579 HeapRegionRemSet* hrrs = rem_set(); | |
580 hrrs->migrate_strong_code_roots(); | |
581 } | |
582 | |
583 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
584 HeapRegionRemSet* hrrs = rem_set(); | |
585 hrrs->strong_code_roots_do(blk); | |
586 } | |
587 | |
588 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
589 const HeapRegion* _hr; | |
590 nmethod* _nm; | |
591 bool _failures; | |
592 bool _has_oops_in_region; | |
593 | |
594 template <class T> void do_oop_work(T* p) { | |
595 T heap_oop = oopDesc::load_heap_oop(p); | |
596 if (!oopDesc::is_null(heap_oop)) { | |
597 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
598 | |
599 // Note: not all the oops embedded in the nmethod are in the | |
600 // current region. We only look at those which are. | |
601 if (_hr->is_in(obj)) { | |
602 // Object is in the region. Check that its less than top | |
603 if (_hr->top() <= (HeapWord*)obj) { | |
604 // Object is above top | |
605 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
606 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
607 "top "PTR_FORMAT, | |
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608 (void *)obj, _hr->bottom(), _hr->end(), _hr->top()); |
12080 | 609 _failures = true; |
610 return; | |
611 } | |
612 // Nmethod has at least one oop in the current region | |
613 _has_oops_in_region = true; | |
614 } | |
615 } | |
616 } | |
617 | |
618 public: | |
619 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
620 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
621 | |
622 void do_oop(narrowOop* p) { do_oop_work(p); } | |
623 void do_oop(oop* p) { do_oop_work(p); } | |
624 | |
625 bool failures() { return _failures; } | |
626 bool has_oops_in_region() { return _has_oops_in_region; } | |
627 }; | |
628 | |
629 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
630 const HeapRegion* _hr; | |
631 bool _failures; | |
632 public: | |
633 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
634 _hr(hr), _failures(false) {} | |
635 | |
636 void do_code_blob(CodeBlob* cb) { | |
637 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
638 if (nm != NULL) { | |
639 // Verify that the nemthod is live | |
640 if (!nm->is_alive()) { | |
641 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
642 PTR_FORMAT" in its strong code roots", | |
643 _hr->bottom(), _hr->end(), nm); | |
644 _failures = true; | |
645 } else { | |
646 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
647 nm->oops_do(&oop_cl); | |
648 if (!oop_cl.has_oops_in_region()) { | |
649 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
650 PTR_FORMAT" in its strong code roots " | |
651 "with no pointers into region", | |
652 _hr->bottom(), _hr->end(), nm); | |
653 _failures = true; | |
654 } else if (oop_cl.failures()) { | |
655 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
656 "failures for nmethod "PTR_FORMAT, | |
657 _hr->bottom(), _hr->end(), nm); | |
658 _failures = true; | |
659 } | |
660 } | |
661 } | |
662 } | |
663 | |
664 bool failures() { return _failures; } | |
665 }; | |
666 | |
667 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
668 if (!G1VerifyHeapRegionCodeRoots) { | |
669 // We're not verifying code roots. | |
670 return; | |
671 } | |
672 if (vo == VerifyOption_G1UseMarkWord) { | |
673 // Marking verification during a full GC is performed after class | |
674 // unloading, code cache unloading, etc so the strong code roots | |
675 // attached to each heap region are in an inconsistent state. They won't | |
676 // be consistent until the strong code roots are rebuilt after the | |
677 // actual GC. Skip verifying the strong code roots in this particular | |
678 // time. | |
679 assert(VerifyDuringGC, "only way to get here"); | |
680 return; | |
681 } | |
682 | |
683 HeapRegionRemSet* hrrs = rem_set(); | |
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684 size_t strong_code_roots_length = hrrs->strong_code_roots_list_length(); |
12080 | 685 |
686 // if this region is empty then there should be no entries | |
687 // on its strong code root list | |
688 if (is_empty()) { | |
689 if (strong_code_roots_length > 0) { | |
690 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
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691 "but has "SIZE_FORMAT" code root entries", |
12080 | 692 bottom(), end(), strong_code_roots_length); |
693 *failures = true; | |
694 } | |
695 return; | |
696 } | |
697 | |
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698 if (continuesHumongous()) { |
12080 | 699 if (strong_code_roots_length > 0) { |
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700 gclog_or_tty->print_cr("region "HR_FORMAT" is a continuation of a humongous " |
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701 "region but has "SIZE_FORMAT" code root entries", |
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702 HR_FORMAT_PARAMS(this), strong_code_roots_length); |
12080 | 703 *failures = true; |
704 } | |
705 return; | |
706 } | |
707 | |
708 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
709 strong_code_roots_do(&cb_cl); | |
710 | |
711 if (cb_cl.failures()) { | |
712 *failures = true; | |
713 } | |
714 } | |
715 | |
342 | 716 void HeapRegion::print() const { print_on(gclog_or_tty); } |
717 void HeapRegion::print_on(outputStream* st) const { | |
718 if (isHumongous()) { | |
719 if (startsHumongous()) | |
720 st->print(" HS"); | |
721 else | |
722 st->print(" HC"); | |
723 } else { | |
724 st->print(" "); | |
725 } | |
726 if (in_collection_set()) | |
727 st->print(" CS"); | |
728 else | |
729 st->print(" "); | |
730 if (is_young()) | |
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731 st->print(is_survivor() ? " SU" : " Y "); |
342 | 732 else |
733 st->print(" "); | |
734 if (is_empty()) | |
735 st->print(" F"); | |
736 else | |
737 st->print(" "); | |
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738 st->print(" TS %5d", _gc_time_stamp); |
1388 | 739 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
740 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 741 G1OffsetTableContigSpace::print_on(st); |
742 } | |
743 | |
12080 | 744 class VerifyLiveClosure: public OopClosure { |
745 private: | |
746 G1CollectedHeap* _g1h; | |
747 CardTableModRefBS* _bs; | |
748 oop _containing_obj; | |
749 bool _failures; | |
750 int _n_failures; | |
751 VerifyOption _vo; | |
752 public: | |
753 // _vo == UsePrevMarking -> use "prev" marking information, | |
754 // _vo == UseNextMarking -> use "next" marking information, | |
755 // _vo == UseMarkWord -> use mark word from object header. | |
756 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
757 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
758 _failures(false), _n_failures(0), _vo(vo) | |
759 { | |
760 BarrierSet* bs = _g1h->barrier_set(); | |
761 if (bs->is_a(BarrierSet::CardTableModRef)) | |
762 _bs = (CardTableModRefBS*)bs; | |
763 } | |
764 | |
765 void set_containing_obj(oop obj) { | |
766 _containing_obj = obj; | |
767 } | |
768 | |
769 bool failures() { return _failures; } | |
770 int n_failures() { return _n_failures; } | |
771 | |
772 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
773 virtual void do_oop( oop* p) { do_oop_work(p); } | |
774 | |
775 void print_object(outputStream* out, oop obj) { | |
776 #ifdef PRODUCT | |
777 Klass* k = obj->klass(); | |
778 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
779 out->print_cr("class name %s", class_name); | |
780 #else // PRODUCT | |
781 obj->print_on(out); | |
782 #endif // PRODUCT | |
783 } | |
784 | |
785 template <class T> | |
786 void do_oop_work(T* p) { | |
787 assert(_containing_obj != NULL, "Precondition"); | |
788 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
789 "Precondition"); | |
790 T heap_oop = oopDesc::load_heap_oop(p); | |
791 if (!oopDesc::is_null(heap_oop)) { | |
792 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
793 bool failed = false; | |
794 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
795 MutexLockerEx x(ParGCRareEvent_lock, | |
796 Mutex::_no_safepoint_check_flag); | |
797 | |
798 if (!_failures) { | |
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799 gclog_or_tty->cr(); |
12080 | 800 gclog_or_tty->print_cr("----------"); |
801 } | |
802 if (!_g1h->is_in_closed_subset(obj)) { | |
803 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
804 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
805 " of live obj "PTR_FORMAT" in region " | |
806 "["PTR_FORMAT", "PTR_FORMAT")", | |
807 p, (void*) _containing_obj, | |
808 from->bottom(), from->end()); | |
809 print_object(gclog_or_tty, _containing_obj); | |
810 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
811 (void*) obj); | |
812 } else { | |
813 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
814 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
815 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
816 " of live obj "PTR_FORMAT" in region " | |
817 "["PTR_FORMAT", "PTR_FORMAT")", | |
818 p, (void*) _containing_obj, | |
819 from->bottom(), from->end()); | |
820 print_object(gclog_or_tty, _containing_obj); | |
821 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
822 "["PTR_FORMAT", "PTR_FORMAT")", | |
823 (void*) obj, to->bottom(), to->end()); | |
824 print_object(gclog_or_tty, obj); | |
825 } | |
826 gclog_or_tty->print_cr("----------"); | |
827 gclog_or_tty->flush(); | |
828 _failures = true; | |
829 failed = true; | |
830 _n_failures++; | |
831 } | |
832 | |
833 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
834 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
835 HeapRegion* to = _g1h->heap_region_containing(obj); | |
836 if (from != NULL && to != NULL && | |
837 from != to && | |
838 !to->isHumongous()) { | |
839 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
840 jbyte cv_field = *_bs->byte_for_const(p); | |
841 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
842 | |
843 bool is_bad = !(from->is_young() | |
844 || to->rem_set()->contains_reference(p) | |
845 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
846 (_containing_obj->is_objArray() ? | |
847 cv_field == dirty | |
848 : cv_obj == dirty || cv_field == dirty)); | |
849 if (is_bad) { | |
850 MutexLockerEx x(ParGCRareEvent_lock, | |
851 Mutex::_no_safepoint_check_flag); | |
852 | |
853 if (!_failures) { | |
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854 gclog_or_tty->cr(); |
12080 | 855 gclog_or_tty->print_cr("----------"); |
856 } | |
857 gclog_or_tty->print_cr("Missing rem set entry:"); | |
858 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
859 "of obj "PTR_FORMAT", " | |
860 "in region "HR_FORMAT, | |
861 p, (void*) _containing_obj, | |
862 HR_FORMAT_PARAMS(from)); | |
863 _containing_obj->print_on(gclog_or_tty); | |
864 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
865 "in region "HR_FORMAT, | |
866 (void*) obj, | |
867 HR_FORMAT_PARAMS(to)); | |
868 obj->print_on(gclog_or_tty); | |
869 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
870 cv_obj, cv_field); | |
871 gclog_or_tty->print_cr("----------"); | |
872 gclog_or_tty->flush(); | |
873 _failures = true; | |
874 if (!failed) _n_failures++; | |
875 } | |
876 } | |
877 } | |
878 } | |
879 } | |
880 }; | |
811 | 881 |
342 | 882 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
883 // We would need a mechanism to make that code skip dead objects. | |
884 | |
6008 | 885 void HeapRegion::verify(VerifyOption vo, |
1020
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886 bool* failures) const { |
342 | 887 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
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888 *failures = false; |
342 | 889 HeapWord* p = bottom(); |
890 HeapWord* prev_p = NULL; | |
3772
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891 VerifyLiveClosure vl_cl(g1, vo); |
1718
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892 bool is_humongous = isHumongous(); |
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893 bool do_bot_verify = !is_young(); |
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894 size_t object_num = 0; |
342 | 895 while (p < top()) { |
2133
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896 oop obj = oop(p); |
20276
1526a938e670
8047818: G1 HeapRegions can no longer be ContiguousSpaces
mgerdin
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|
897 size_t obj_size = block_size(p); |
2133
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898 object_num += 1; |
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|
899 |
20278
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900 if (is_humongous != g1->isHumongous(obj_size) && |
2c6ef90f030a
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901 !g1->is_obj_dead(obj, this)) { // Dead objects may have bigger block_size since they span several objects. |
1718
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tonyp
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|
902 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
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|
903 SIZE_FORMAT" words) in a %shumongous region", |
2133
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|
904 p, g1->isHumongous(obj_size) ? "" : "non-", |
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1972
diff
changeset
|
905 obj_size, is_humongous ? "" : "non-"); |
1718
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parents:
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|
906 *failures = true; |
2133
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diff
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|
907 return; |
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diff
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|
908 } |
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diff
changeset
|
909 |
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|
910 // If it returns false, verify_for_object() will output the |
20336
6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents:
20295
diff
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|
911 // appropriate message. |
20278
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stefank
parents:
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diff
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|
912 if (do_bot_verify && |
2c6ef90f030a
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|
913 !g1->is_obj_dead(obj, this) && |
2c6ef90f030a
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914 !_offsets.verify_for_object(p, obj_size)) { |
2133
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|
915 *failures = true; |
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diff
changeset
|
916 return; |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
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parents:
1705
diff
changeset
|
917 } |
2133
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diff
changeset
|
918 |
3772
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|
919 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
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|
920 if (obj->is_oop()) { |
6725
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6964458: Reimplement class meta-data storage to use native memory
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parents:
6611
diff
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|
921 Klass* klass = obj->klass(); |
20278
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8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
922 bool is_metaspace_object = Metaspace::contains(klass) || |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20276
diff
changeset
|
923 (vo == VerifyOption_G1UsePrevMarking && |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20276
diff
changeset
|
924 ClassLoaderDataGraph::unload_list_contains(klass)); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20276
diff
changeset
|
925 if (!is_metaspace_object) { |
2133
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parents:
1972
diff
changeset
|
926 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
927 "not metadata", klass, (void *)obj); |
2133
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
928 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
929 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
930 } else if (!klass->is_klass()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
931 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
932 "not a klass", klass, (void *)obj); |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
933 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
934 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
935 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
936 vl_cl.set_containing_obj(obj); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
937 obj->oop_iterate_no_header(&vl_cl); |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
938 if (vl_cl.failures()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
939 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
940 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
941 if (G1MaxVerifyFailures >= 0 && |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
942 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
943 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
944 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
945 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
946 } else { |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
947 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", (void *)obj); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
948 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
949 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
950 } |
342 | 951 } |
952 prev_p = p; | |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
953 p += obj_size; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
954 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
955 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
956 if (p != top()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
957 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
958 "does not match top "PTR_FORMAT, p, top()); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
959 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
960 return; |
342 | 961 } |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
962 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
963 HeapWord* the_end = end(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
964 assert(p == top(), "it should still hold"); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
965 // Do some extra BOT consistency checking for addresses in the |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
966 // range [top, end). BOT look-ups in this range should yield |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
967 // top. No point in doing that if top == end (there's nothing there). |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
968 if (p < the_end) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
969 // Look up top |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
970 HeapWord* addr_1 = p; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
971 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
972 if (b_start_1 != p) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
973 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
974 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
975 addr_1, b_start_1, p); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
976 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
977 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
978 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
979 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
980 // Look up top + 1 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
981 HeapWord* addr_2 = p + 1; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
982 if (addr_2 < the_end) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
983 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
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|
984 if (b_start_2 != p) { |
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985 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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986 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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987 addr_2, b_start_2, p); |
1020
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988 *failures = true; |
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989 return; |
2133
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990 } |
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991 } |
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992 |
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993 // Look up an address between top and end |
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994 size_t diff = pointer_delta(the_end, p) / 2; |
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995 HeapWord* addr_3 = p + diff; |
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996 if (addr_3 < the_end) { |
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997 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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998 if (b_start_3 != p) { |
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999 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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1000 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1001 addr_3, b_start_3, p); |
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1002 *failures = true; |
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1003 return; |
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1004 } |
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1005 } |
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1006 |
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1007 // Loook up end - 1 |
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1008 HeapWord* addr_4 = the_end - 1; |
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1009 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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1010 if (b_start_4 != p) { |
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1011 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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1012 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1013 addr_4, b_start_4, p); |
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1014 *failures = true; |
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1015 return; |
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1016 } |
342 | 1017 } |
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1018 |
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1019 if (is_humongous && object_num > 1) { |
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1020 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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1021 "but has "SIZE_FORMAT", objects", |
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1022 bottom(), end(), object_num); |
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1023 *failures = true; |
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1024 return; |
342 | 1025 } |
12080 | 1026 |
1027 verify_strong_code_roots(vo, failures); | |
1028 } | |
1029 | |
1030 void HeapRegion::verify() const { | |
1031 bool dummy = false; | |
1032 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); | |
342 | 1033 } |
1034 | |
1035 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
1036 // away eventually. | |
1037 | |
356 | 1038 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
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1039 set_top(bottom()); |
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1040 set_saved_mark_word(bottom()); |
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1041 CompactibleSpace::clear(mangle_space); |
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1042 reset_bot(); |
342 | 1043 } |
1044 | |
1045 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
1046 Space::set_bottom(new_bottom); | |
1047 _offsets.set_bottom(new_bottom); | |
1048 } | |
1049 | |
1050 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
1051 Space::set_end(new_end); | |
1052 _offsets.resize(new_end - bottom()); | |
1053 } | |
1054 | |
1055 void G1OffsetTableContigSpace::print() const { | |
1056 print_short(); | |
1057 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
1058 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
1059 bottom(), top(), _offsets.threshold(), end()); | |
1060 } | |
1061 | |
1062 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
1063 return _offsets.initialize_threshold(); | |
1064 } | |
1065 | |
1066 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
1067 HeapWord* end) { | |
1068 _offsets.alloc_block(start, end); | |
1069 return _offsets.threshold(); | |
1070 } | |
1071 | |
1072 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
1073 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1074 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
1075 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
1076 return top(); | |
1077 else | |
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1078 return Space::saved_mark_word(); |
342 | 1079 } |
1080 | |
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1081 void G1OffsetTableContigSpace::record_top_and_timestamp() { |
342 | 1082 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1083 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
1084 | |
1085 if (_gc_time_stamp < curr_gc_time_stamp) { | |
1086 // The order of these is important, as another thread might be | |
1087 // about to start scanning this region. If it does so after | |
1088 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
1089 // will be false, and it will pick up top() as the high water mark | |
1090 // of region. If it does so after _gc_time_stamp = ..., then it | |
1091 // will pick up the right saved_mark_word() as the high water mark | |
1092 // of the region. Either way, the behaviour will be correct. | |
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1093 Space::set_saved_mark_word(top()); |
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1094 OrderAccess::storestore(); |
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1095 _gc_time_stamp = curr_gc_time_stamp; |
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1096 // No need to do another barrier to flush the writes above. If |
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1097 // this is called in parallel with other threads trying to |
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1098 // allocate into the region, the caller should call this while |
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1099 // holding a lock and when the lock is released the writes will be |
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1100 // flushed. |
342 | 1101 } |
1102 } | |
1103 | |
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1104 void G1OffsetTableContigSpace::safe_object_iterate(ObjectClosure* blk) { |
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1105 object_iterate(blk); |
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1106 } |
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1107 |
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1108 void G1OffsetTableContigSpace::object_iterate(ObjectClosure* blk) { |
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1109 HeapWord* p = bottom(); |
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1110 while (p < top()) { |
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1111 if (block_is_obj(p)) { |
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1112 blk->do_object(oop(p)); |
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1113 } |
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1114 p += block_size(p); |
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1115 } |
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1116 } |
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1117 |
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1118 #define block_is_always_obj(q) true |
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1119 void G1OffsetTableContigSpace::prepare_for_compaction(CompactPoint* cp) { |
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1120 SCAN_AND_FORWARD(cp, top, block_is_always_obj, block_size); |
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1121 } |
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1122 #undef block_is_always_obj |
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1123 |
342 | 1124 G1OffsetTableContigSpace:: |
1125 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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1126 MemRegion mr) : |
342 | 1127 _offsets(sharedOffsetArray, mr), |
1128 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
1129 _gc_time_stamp(0) | |
1130 { | |
1131 _offsets.set_space(this); | |
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1132 } |
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1133 |
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1134 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
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1135 CompactibleSpace::initialize(mr, clear_space, mangle_space); |
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1136 _top = bottom(); |
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1137 reset_bot(); |
342 | 1138 } |
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1139 |