Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 20417:d35872270666
8057658: Enable G1 FullGC extensions
Summary: Refactored the G1 FullGC code to enable it to be extended.
Reviewed-by: mgerdin, brutisso
author | sjohanss |
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date | Tue, 09 Sep 2014 00:05:25 +0200 |
parents | 227a9e5e4b4a |
children | 5248357b7113 |
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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" | |
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32 #include "gc_implementation/g1/heapRegionManager.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 | |
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222 set_allocation_context(AllocationContext::system()); |
342 | 223 set_young_index_in_cset(-1); |
224 uninstall_surv_rate_group(); | |
225 set_young_type(NotYoung); | |
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226 reset_pre_dummy_top(); |
342 | 227 |
228 if (!par) { | |
229 // If this is parallel, this will be done later. | |
230 HeapRegionRemSet* hrrs = rem_set(); | |
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231 if (locked) { |
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232 hrrs->clear_locked(); |
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233 } else { |
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234 hrrs->clear(); |
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235 } |
355 | 236 _claimed = InitialClaimValue; |
342 | 237 } |
238 zero_marked_bytes(); | |
239 | |
240 _offsets.resize(HeapRegion::GrainWords); | |
241 init_top_at_mark_start(); | |
356 | 242 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 243 } |
244 | |
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245 void HeapRegion::par_clear() { |
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246 assert(used() == 0, "the region should have been already cleared"); |
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247 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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248 HeapRegionRemSet* hrrs = rem_set(); |
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249 hrrs->clear(); |
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250 CardTableModRefBS* ct_bs = |
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251 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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252 ct_bs->clear(MemRegion(bottom(), end())); |
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253 } |
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254 |
342 | 255 void HeapRegion::calc_gc_efficiency() { |
6611 | 256 // GC efficiency is the ratio of how much space would be |
257 // reclaimed over how long we predict it would take to reclaim it. | |
342 | 258 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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259 G1CollectorPolicy* g1p = g1h->g1_policy(); |
6611 | 260 |
261 // Retrieve a prediction of the elapsed time for this region for | |
262 // a mixed gc because the region will only be evacuated during a | |
263 // mixed gc. | |
264 double region_elapsed_time_ms = | |
265 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
266 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
342 | 267 } |
268 | |
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269 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 270 assert(!isHumongous(), "sanity / pre-condition"); |
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271 assert(end() == _orig_end, |
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272 "Should be normal before the humongous object allocation"); |
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273 assert(top() == bottom(), "should be empty"); |
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274 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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275 |
355 | 276 _humongous_type = StartsHumongous; |
342 | 277 _humongous_start_region = this; |
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278 |
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279 set_end(new_end); |
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280 _offsets.set_for_starts_humongous(new_top); |
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281 } |
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282 |
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283 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 284 assert(!isHumongous(), "sanity / pre-condition"); |
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285 assert(end() == _orig_end, |
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286 "Should be normal before the humongous object allocation"); |
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287 assert(top() == bottom(), "should be empty"); |
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288 assert(first_hr->startsHumongous(), "pre-condition"); |
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289 |
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290 _humongous_type = ContinuesHumongous; |
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291 _humongous_start_region = first_hr; |
342 | 292 } |
293 | |
2152 | 294 void HeapRegion::set_notHumongous() { |
295 assert(isHumongous(), "pre-condition"); | |
296 | |
297 if (startsHumongous()) { | |
298 assert(top() <= end(), "pre-condition"); | |
299 set_end(_orig_end); | |
300 if (top() > end()) { | |
301 // at least one "continues humongous" region after it | |
302 set_top(end()); | |
303 } | |
304 } else { | |
305 // continues humongous | |
306 assert(end() == _orig_end, "sanity"); | |
307 } | |
308 | |
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309 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
2152 | 310 _humongous_type = NotHumongous; |
311 _humongous_start_region = NULL; | |
312 } | |
313 | |
342 | 314 bool HeapRegion::claimHeapRegion(jint claimValue) { |
315 jint current = _claimed; | |
316 if (current != claimValue) { | |
317 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
318 if (res == current) { | |
319 return true; | |
320 } | |
321 } | |
322 return false; | |
323 } | |
324 | |
325 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
326 HeapWord* low = addr; | |
327 HeapWord* high = end(); | |
328 while (low < high) { | |
329 size_t diff = pointer_delta(high, low); | |
330 // Must add one below to bias toward the high amount. Otherwise, if | |
331 // "high" were at the desired value, and "low" were one less, we | |
332 // would not converge on "high". This is not symmetric, because | |
333 // we set "high" to a block start, which might be the right one, | |
334 // which we don't do for "low". | |
335 HeapWord* middle = low + (diff+1)/2; | |
336 if (middle == high) return high; | |
337 HeapWord* mid_bs = block_start_careful(middle); | |
338 if (mid_bs < addr) { | |
339 low = middle; | |
340 } else { | |
341 high = mid_bs; | |
342 } | |
343 } | |
344 assert(low == high && low >= addr, "Didn't work."); | |
345 return low; | |
346 } | |
347 | |
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348 HeapRegion::HeapRegion(uint hrm_index, |
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349 G1BlockOffsetSharedArray* sharedOffsetArray, |
20417 | 350 MemRegion mr) : |
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351 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
20417 | 352 _hrm_index(hrm_index), |
353 _allocation_context(AllocationContext::system()), | |
355 | 354 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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355 _in_collection_set(false), |
342 | 356 _next_in_special_set(NULL), _orig_end(NULL), |
355 | 357 _claimed(InitialClaimValue), _evacuation_failed(false), |
6011 | 358 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
342 | 359 _young_type(NotYoung), _next_young_region(NULL), |
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360 _next_dirty_cards_region(NULL), _next(NULL), _prev(NULL), |
2152 | 361 #ifdef ASSERT |
362 _containing_set(NULL), | |
363 #endif // ASSERT | |
364 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
365 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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366 _predicted_bytes_to_copy(0) |
342 | 367 { |
12080 | 368 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
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369 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); |
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370 |
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371 initialize(mr); |
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372 } |
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373 |
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374 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
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375 assert(_rem_set->is_empty(), "Remembered set must be empty"); |
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376 |
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377 G1OffsetTableContigSpace::initialize(mr, clear_space, mangle_space); |
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378 |
342 | 379 _orig_end = mr.end(); |
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380 hr_clear(false /*par*/, false /*clear_space*/); |
356 | 381 set_top(bottom()); |
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382 record_top_and_timestamp(); |
342 | 383 } |
384 | |
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385 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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386 return G1CollectedHeap::heap()->next_compaction_region(this); |
342 | 387 } |
388 | |
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389 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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390 bool during_conc_mark) { |
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391 // We always recreate the prev marking info and we'll explicitly |
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392 // mark all objects we find to be self-forwarded on the prev |
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393 // bitmap. So all objects need to be below PTAMS. |
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394 _prev_marked_bytes = 0; |
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395 |
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396 if (during_initial_mark) { |
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397 // During initial-mark, we'll also explicitly mark all objects |
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398 // we find to be self-forwarded on the next bitmap. So all |
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399 // objects need to be below NTAMS. |
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400 _next_top_at_mark_start = top(); |
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401 _next_marked_bytes = 0; |
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402 } else if (during_conc_mark) { |
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403 // During concurrent mark, all objects in the CSet (including |
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404 // the ones we find to be self-forwarded) are implicitly live. |
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405 // So all objects need to be above NTAMS. |
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406 _next_top_at_mark_start = bottom(); |
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407 _next_marked_bytes = 0; |
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408 } |
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409 } |
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410 |
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411 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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412 bool during_conc_mark, |
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413 size_t marked_bytes) { |
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414 assert(0 <= marked_bytes && marked_bytes <= used(), |
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415 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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416 marked_bytes, used())); |
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417 _prev_top_at_mark_start = top(); |
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418 _prev_marked_bytes = marked_bytes; |
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419 } |
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420 |
342 | 421 HeapWord* |
422 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
423 ObjectClosure* cl) { | |
424 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
425 // We used to use "block_start_careful" here. But we're actually happy | |
426 // to update the BOT while we do this... | |
427 HeapWord* cur = block_start(mr.start()); | |
428 mr = mr.intersection(used_region()); | |
429 if (mr.is_empty()) return NULL; | |
430 // Otherwise, find the obj that extends onto mr.start(). | |
431 | |
432 assert(cur <= mr.start() | |
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433 && (oop(cur)->klass_or_null() == NULL || |
342 | 434 cur + oop(cur)->size() > mr.start()), |
435 "postcondition of block_start"); | |
436 oop obj; | |
437 while (cur < mr.end()) { | |
438 obj = oop(cur); | |
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439 if (obj->klass_or_null() == NULL) { |
342 | 440 // Ran into an unparseable point. |
441 return cur; | |
442 } else if (!g1h->is_obj_dead(obj)) { | |
443 cl->do_object(obj); | |
444 } | |
445 if (cl->abort()) return cur; | |
446 // The check above must occur before the operation below, since an | |
447 // abort might invalidate the "size" operation. | |
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448 cur += block_size(cur); |
342 | 449 } |
450 return NULL; | |
451 } | |
452 | |
453 HeapWord* | |
454 HeapRegion:: | |
455 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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456 FilterOutOfRegionClosure* cl, |
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457 bool filter_young, |
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458 jbyte* card_ptr) { |
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459 // Currently, we should only have to clean the card if filter_young |
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460 // is true and vice versa. |
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461 if (filter_young) { |
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462 assert(card_ptr != NULL, "pre-condition"); |
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463 } else { |
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464 assert(card_ptr == NULL, "pre-condition"); |
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465 } |
342 | 466 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
467 | |
468 // If we're within a stop-world GC, then we might look at a card in a | |
469 // GC alloc region that extends onto a GC LAB, which may not be | |
470 // parseable. Stop such at the "saved_mark" of the region. | |
4839 | 471 if (g1h->is_gc_active()) { |
342 | 472 mr = mr.intersection(used_region_at_save_marks()); |
473 } else { | |
474 mr = mr.intersection(used_region()); | |
475 } | |
476 if (mr.is_empty()) return NULL; | |
477 // Otherwise, find the obj that extends onto mr.start(). | |
478 | |
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479 // The intersection of the incoming mr (for the card) and the |
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480 // allocated part of the region is non-empty. This implies that |
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481 // we have actually allocated into this region. The code in |
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482 // G1CollectedHeap.cpp that allocates a new region sets the |
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483 // is_young tag on the region before allocating. Thus we |
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484 // safely know if this region is young. |
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485 if (is_young() && filter_young) { |
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486 return NULL; |
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487 } |
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488 |
1705 | 489 assert(!is_young(), "check value of filter_young"); |
490 | |
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491 // We can only clean the card here, after we make the decision that |
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492 // the card is not young. And we only clean the card if we have been |
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493 // asked to (i.e., card_ptr != NULL). |
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494 if (card_ptr != NULL) { |
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495 *card_ptr = CardTableModRefBS::clean_card_val(); |
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496 // We must complete this write before we do any of the reads below. |
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497 OrderAccess::storeload(); |
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498 } |
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499 |
4839 | 500 // Cache the boundaries of the memory region in some const locals |
501 HeapWord* const start = mr.start(); | |
502 HeapWord* const end = mr.end(); | |
503 | |
342 | 504 // We used to use "block_start_careful" here. But we're actually happy |
505 // to update the BOT while we do this... | |
4839 | 506 HeapWord* cur = block_start(start); |
507 assert(cur <= start, "Postcondition"); | |
508 | |
509 oop obj; | |
342 | 510 |
4839 | 511 HeapWord* next = cur; |
512 while (next <= start) { | |
513 cur = next; | |
514 obj = oop(cur); | |
515 if (obj->klass_or_null() == NULL) { | |
342 | 516 // Ran into an unparseable point. |
517 return cur; | |
518 } | |
519 // Otherwise... | |
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520 next = cur + block_size(cur); |
342 | 521 } |
4839 | 522 |
523 // If we finish the above loop...We have a parseable object that | |
524 // begins on or before the start of the memory region, and ends | |
525 // inside or spans the entire region. | |
526 | |
527 assert(obj == oop(cur), "sanity"); | |
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528 assert(cur <= start, "Loop postcondition"); |
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529 assert(obj->klass_or_null() != NULL, "Loop postcondition"); |
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530 assert((cur + block_size(cur)) > start, "Loop postcondition"); |
4839 | 531 |
342 | 532 if (!g1h->is_obj_dead(obj)) { |
533 obj->oop_iterate(cl, mr); | |
534 } | |
535 | |
4839 | 536 while (cur < end) { |
342 | 537 obj = oop(cur); |
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538 if (obj->klass_or_null() == NULL) { |
342 | 539 // Ran into an unparseable point. |
540 return cur; | |
541 }; | |
4839 | 542 |
342 | 543 // Otherwise: |
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544 next = cur + block_size(cur); |
4839 | 545 |
342 | 546 if (!g1h->is_obj_dead(obj)) { |
4839 | 547 if (next < end || !obj->is_objArray()) { |
548 // This object either does not span the MemRegion | |
549 // boundary, or if it does it's not an array. | |
550 // Apply closure to whole object. | |
342 | 551 obj->oop_iterate(cl); |
552 } else { | |
4839 | 553 // This obj is an array that spans the boundary. |
554 // Stop at the boundary. | |
555 obj->oop_iterate(cl, mr); | |
342 | 556 } |
557 } | |
558 cur = next; | |
559 } | |
560 return NULL; | |
561 } | |
562 | |
12080 | 563 // Code roots support |
564 | |
565 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
566 HeapRegionRemSet* hrrs = rem_set(); | |
567 hrrs->add_strong_code_root(nm); | |
568 } | |
569 | |
570 void HeapRegion::remove_strong_code_root(nmethod* nm) { | |
571 HeapRegionRemSet* hrrs = rem_set(); | |
572 hrrs->remove_strong_code_root(nm); | |
573 } | |
574 | |
575 void HeapRegion::migrate_strong_code_roots() { | |
576 assert(in_collection_set(), "only collection set regions"); | |
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577 assert(!isHumongous(), |
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578 err_msg("humongous region "HR_FORMAT" should not have been added to collection set", |
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579 HR_FORMAT_PARAMS(this))); |
12080 | 580 |
581 HeapRegionRemSet* hrrs = rem_set(); | |
582 hrrs->migrate_strong_code_roots(); | |
583 } | |
584 | |
585 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
586 HeapRegionRemSet* hrrs = rem_set(); | |
587 hrrs->strong_code_roots_do(blk); | |
588 } | |
589 | |
590 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
591 const HeapRegion* _hr; | |
592 nmethod* _nm; | |
593 bool _failures; | |
594 bool _has_oops_in_region; | |
595 | |
596 template <class T> void do_oop_work(T* p) { | |
597 T heap_oop = oopDesc::load_heap_oop(p); | |
598 if (!oopDesc::is_null(heap_oop)) { | |
599 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
600 | |
601 // Note: not all the oops embedded in the nmethod are in the | |
602 // current region. We only look at those which are. | |
603 if (_hr->is_in(obj)) { | |
604 // Object is in the region. Check that its less than top | |
605 if (_hr->top() <= (HeapWord*)obj) { | |
606 // Object is above top | |
607 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
608 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
609 "top "PTR_FORMAT, | |
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610 (void *)obj, _hr->bottom(), _hr->end(), _hr->top()); |
12080 | 611 _failures = true; |
612 return; | |
613 } | |
614 // Nmethod has at least one oop in the current region | |
615 _has_oops_in_region = true; | |
616 } | |
617 } | |
618 } | |
619 | |
620 public: | |
621 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
622 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
623 | |
624 void do_oop(narrowOop* p) { do_oop_work(p); } | |
625 void do_oop(oop* p) { do_oop_work(p); } | |
626 | |
627 bool failures() { return _failures; } | |
628 bool has_oops_in_region() { return _has_oops_in_region; } | |
629 }; | |
630 | |
631 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
632 const HeapRegion* _hr; | |
633 bool _failures; | |
634 public: | |
635 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
636 _hr(hr), _failures(false) {} | |
637 | |
638 void do_code_blob(CodeBlob* cb) { | |
639 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
640 if (nm != NULL) { | |
641 // Verify that the nemthod is live | |
642 if (!nm->is_alive()) { | |
643 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
644 PTR_FORMAT" in its strong code roots", | |
645 _hr->bottom(), _hr->end(), nm); | |
646 _failures = true; | |
647 } else { | |
648 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
649 nm->oops_do(&oop_cl); | |
650 if (!oop_cl.has_oops_in_region()) { | |
651 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
652 PTR_FORMAT" in its strong code roots " | |
653 "with no pointers into region", | |
654 _hr->bottom(), _hr->end(), nm); | |
655 _failures = true; | |
656 } else if (oop_cl.failures()) { | |
657 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
658 "failures for nmethod "PTR_FORMAT, | |
659 _hr->bottom(), _hr->end(), nm); | |
660 _failures = true; | |
661 } | |
662 } | |
663 } | |
664 } | |
665 | |
666 bool failures() { return _failures; } | |
667 }; | |
668 | |
669 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
670 if (!G1VerifyHeapRegionCodeRoots) { | |
671 // We're not verifying code roots. | |
672 return; | |
673 } | |
674 if (vo == VerifyOption_G1UseMarkWord) { | |
675 // Marking verification during a full GC is performed after class | |
676 // unloading, code cache unloading, etc so the strong code roots | |
677 // attached to each heap region are in an inconsistent state. They won't | |
678 // be consistent until the strong code roots are rebuilt after the | |
679 // actual GC. Skip verifying the strong code roots in this particular | |
680 // time. | |
681 assert(VerifyDuringGC, "only way to get here"); | |
682 return; | |
683 } | |
684 | |
685 HeapRegionRemSet* hrrs = rem_set(); | |
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686 size_t strong_code_roots_length = hrrs->strong_code_roots_list_length(); |
12080 | 687 |
688 // if this region is empty then there should be no entries | |
689 // on its strong code root list | |
690 if (is_empty()) { | |
691 if (strong_code_roots_length > 0) { | |
692 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
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693 "but has "SIZE_FORMAT" code root entries", |
12080 | 694 bottom(), end(), strong_code_roots_length); |
695 *failures = true; | |
696 } | |
697 return; | |
698 } | |
699 | |
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700 if (continuesHumongous()) { |
12080 | 701 if (strong_code_roots_length > 0) { |
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702 gclog_or_tty->print_cr("region "HR_FORMAT" is a continuation of a humongous " |
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703 "region but has "SIZE_FORMAT" code root entries", |
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704 HR_FORMAT_PARAMS(this), strong_code_roots_length); |
12080 | 705 *failures = true; |
706 } | |
707 return; | |
708 } | |
709 | |
710 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
711 strong_code_roots_do(&cb_cl); | |
712 | |
713 if (cb_cl.failures()) { | |
714 *failures = true; | |
715 } | |
716 } | |
717 | |
342 | 718 void HeapRegion::print() const { print_on(gclog_or_tty); } |
719 void HeapRegion::print_on(outputStream* st) const { | |
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720 st->print("AC%4u", allocation_context()); |
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721 |
342 | 722 if (isHumongous()) { |
723 if (startsHumongous()) | |
724 st->print(" HS"); | |
725 else | |
726 st->print(" HC"); | |
727 } else { | |
728 st->print(" "); | |
729 } | |
730 if (in_collection_set()) | |
731 st->print(" CS"); | |
732 else | |
733 st->print(" "); | |
734 if (is_young()) | |
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735 st->print(is_survivor() ? " SU" : " Y "); |
342 | 736 else |
737 st->print(" "); | |
738 if (is_empty()) | |
739 st->print(" F"); | |
740 else | |
741 st->print(" "); | |
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742 st->print(" TS %5d", _gc_time_stamp); |
1388 | 743 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
744 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 745 G1OffsetTableContigSpace::print_on(st); |
746 } | |
747 | |
12080 | 748 class VerifyLiveClosure: public OopClosure { |
749 private: | |
750 G1CollectedHeap* _g1h; | |
751 CardTableModRefBS* _bs; | |
752 oop _containing_obj; | |
753 bool _failures; | |
754 int _n_failures; | |
755 VerifyOption _vo; | |
756 public: | |
757 // _vo == UsePrevMarking -> use "prev" marking information, | |
758 // _vo == UseNextMarking -> use "next" marking information, | |
759 // _vo == UseMarkWord -> use mark word from object header. | |
760 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
761 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
762 _failures(false), _n_failures(0), _vo(vo) | |
763 { | |
764 BarrierSet* bs = _g1h->barrier_set(); | |
765 if (bs->is_a(BarrierSet::CardTableModRef)) | |
766 _bs = (CardTableModRefBS*)bs; | |
767 } | |
768 | |
769 void set_containing_obj(oop obj) { | |
770 _containing_obj = obj; | |
771 } | |
772 | |
773 bool failures() { return _failures; } | |
774 int n_failures() { return _n_failures; } | |
775 | |
776 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
777 virtual void do_oop( oop* p) { do_oop_work(p); } | |
778 | |
779 void print_object(outputStream* out, oop obj) { | |
780 #ifdef PRODUCT | |
781 Klass* k = obj->klass(); | |
782 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
783 out->print_cr("class name %s", class_name); | |
784 #else // PRODUCT | |
785 obj->print_on(out); | |
786 #endif // PRODUCT | |
787 } | |
788 | |
789 template <class T> | |
790 void do_oop_work(T* p) { | |
791 assert(_containing_obj != NULL, "Precondition"); | |
792 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
793 "Precondition"); | |
794 T heap_oop = oopDesc::load_heap_oop(p); | |
795 if (!oopDesc::is_null(heap_oop)) { | |
796 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
797 bool failed = false; | |
798 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
799 MutexLockerEx x(ParGCRareEvent_lock, | |
800 Mutex::_no_safepoint_check_flag); | |
801 | |
802 if (!_failures) { | |
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803 gclog_or_tty->cr(); |
12080 | 804 gclog_or_tty->print_cr("----------"); |
805 } | |
806 if (!_g1h->is_in_closed_subset(obj)) { | |
807 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
808 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
809 " of live obj "PTR_FORMAT" in region " | |
810 "["PTR_FORMAT", "PTR_FORMAT")", | |
811 p, (void*) _containing_obj, | |
812 from->bottom(), from->end()); | |
813 print_object(gclog_or_tty, _containing_obj); | |
814 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
815 (void*) obj); | |
816 } else { | |
817 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
818 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
819 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
820 " of live obj "PTR_FORMAT" in region " | |
821 "["PTR_FORMAT", "PTR_FORMAT")", | |
822 p, (void*) _containing_obj, | |
823 from->bottom(), from->end()); | |
824 print_object(gclog_or_tty, _containing_obj); | |
825 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
826 "["PTR_FORMAT", "PTR_FORMAT")", | |
827 (void*) obj, to->bottom(), to->end()); | |
828 print_object(gclog_or_tty, obj); | |
829 } | |
830 gclog_or_tty->print_cr("----------"); | |
831 gclog_or_tty->flush(); | |
832 _failures = true; | |
833 failed = true; | |
834 _n_failures++; | |
835 } | |
836 | |
837 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
838 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
839 HeapRegion* to = _g1h->heap_region_containing(obj); | |
840 if (from != NULL && to != NULL && | |
841 from != to && | |
842 !to->isHumongous()) { | |
843 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
844 jbyte cv_field = *_bs->byte_for_const(p); | |
845 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
846 | |
847 bool is_bad = !(from->is_young() | |
848 || to->rem_set()->contains_reference(p) | |
849 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
850 (_containing_obj->is_objArray() ? | |
851 cv_field == dirty | |
852 : cv_obj == dirty || cv_field == dirty)); | |
853 if (is_bad) { | |
854 MutexLockerEx x(ParGCRareEvent_lock, | |
855 Mutex::_no_safepoint_check_flag); | |
856 | |
857 if (!_failures) { | |
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858 gclog_or_tty->cr(); |
12080 | 859 gclog_or_tty->print_cr("----------"); |
860 } | |
861 gclog_or_tty->print_cr("Missing rem set entry:"); | |
862 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
863 "of obj "PTR_FORMAT", " | |
864 "in region "HR_FORMAT, | |
865 p, (void*) _containing_obj, | |
866 HR_FORMAT_PARAMS(from)); | |
867 _containing_obj->print_on(gclog_or_tty); | |
868 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
869 "in region "HR_FORMAT, | |
870 (void*) obj, | |
871 HR_FORMAT_PARAMS(to)); | |
872 obj->print_on(gclog_or_tty); | |
873 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
874 cv_obj, cv_field); | |
875 gclog_or_tty->print_cr("----------"); | |
876 gclog_or_tty->flush(); | |
877 _failures = true; | |
878 if (!failed) _n_failures++; | |
879 } | |
880 } | |
881 } | |
882 } | |
883 } | |
884 }; | |
811 | 885 |
342 | 886 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
887 // We would need a mechanism to make that code skip dead objects. | |
888 | |
6008 | 889 void HeapRegion::verify(VerifyOption vo, |
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890 bool* failures) const { |
342 | 891 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
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892 *failures = false; |
342 | 893 HeapWord* p = bottom(); |
894 HeapWord* prev_p = NULL; | |
3772
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895 VerifyLiveClosure vl_cl(g1, vo); |
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896 bool is_humongous = isHumongous(); |
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897 bool do_bot_verify = !is_young(); |
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898 size_t object_num = 0; |
342 | 899 while (p < top()) { |
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900 oop obj = oop(p); |
20276
1526a938e670
8047818: G1 HeapRegions can no longer be ContiguousSpaces
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|
901 size_t obj_size = block_size(p); |
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902 object_num += 1; |
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|
903 |
20278
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904 if (is_humongous != g1->isHumongous(obj_size) && |
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905 !g1->is_obj_dead(obj, this)) { // Dead objects may have bigger block_size since they span several objects. |
1718
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906 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
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907 SIZE_FORMAT" words) in a %shumongous region", |
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908 p, g1->isHumongous(obj_size) ? "" : "non-", |
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909 obj_size, is_humongous ? "" : "non-"); |
1718
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|
910 *failures = true; |
2133
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|
911 return; |
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|
912 } |
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|
913 |
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914 // If it returns false, verify_for_object() will output the |
20336
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8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
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20295
diff
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|
915 // appropriate message. |
20278
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916 if (do_bot_verify && |
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917 !g1->is_obj_dead(obj, this) && |
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918 !_offsets.verify_for_object(p, obj_size)) { |
2133
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|
919 *failures = true; |
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|
920 return; |
1718
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diff
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|
921 } |
2133
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|
922 |
3772
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|
923 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
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|
924 if (obj->is_oop()) { |
6725
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6611
diff
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|
925 Klass* klass = obj->klass(); |
20278
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stefank
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|
926 bool is_metaspace_object = Metaspace::contains(klass) || |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20276
diff
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|
927 (vo == VerifyOption_G1UsePrevMarking && |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20276
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changeset
|
928 ClassLoaderDataGraph::unload_list_contains(klass)); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20276
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changeset
|
929 if (!is_metaspace_object) { |
2133
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diff
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|
930 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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|
931 "not metadata", klass, (void *)obj); |
2133
2250ee17e258
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diff
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|
932 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
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|
933 return; |
2250ee17e258
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tonyp
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1972
diff
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|
934 } else if (!klass->is_klass()) { |
2250ee17e258
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diff
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|
935 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
|
936 "not a klass", klass, (void *)obj); |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
937 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
938 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
939 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
940 vl_cl.set_containing_obj(obj); |
6725
da91efe96a93
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6611
diff
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|
941 obj->oop_iterate_no_header(&vl_cl); |
2133
2250ee17e258
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1972
diff
changeset
|
942 if (vl_cl.failures()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
943 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
944 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
changeset
|
945 if (G1MaxVerifyFailures >= 0 && |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
946 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
947 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
948 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
changeset
|
949 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
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|
950 } else { |
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
951 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
|
952 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
953 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
954 } |
342 | 955 } |
956 prev_p = p; | |
2133
2250ee17e258
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parents:
1972
diff
changeset
|
957 p += obj_size; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
958 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
changeset
|
959 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
changeset
|
960 if (p != top()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
changeset
|
961 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
|
962 "does not match top "PTR_FORMAT, p, top()); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
963 *failures = true; |
2250ee17e258
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1972
diff
changeset
|
964 return; |
342 | 965 } |
2133
2250ee17e258
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1972
diff
changeset
|
966 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
967 HeapWord* the_end = end(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
968 assert(p == top(), "it should still hold"); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
969 // Do some extra BOT consistency checking for addresses in the |
2250ee17e258
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parents:
1972
diff
changeset
|
970 // 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
|
971 // 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
|
972 if (p < the_end) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
973 // Look up top |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
974 HeapWord* addr_1 = p; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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diff
changeset
|
975 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
976 if (b_start_1 != p) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
977 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
|
978 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
979 addr_1, b_start_1, p); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
980 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
981 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
982 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
983 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
984 // Look up top + 1 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
985 HeapWord* addr_2 = p + 1; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
986 if (addr_2 < the_end) { |
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987 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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988 if (b_start_2 != p) { |
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989 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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990 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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991 addr_2, b_start_2, p); |
1020
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992 *failures = true; |
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993 return; |
2133
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994 } |
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995 } |
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996 |
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997 // Look up an address between top and end |
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998 size_t diff = pointer_delta(the_end, p) / 2; |
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999 HeapWord* addr_3 = p + diff; |
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1000 if (addr_3 < the_end) { |
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1001 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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1002 if (b_start_3 != p) { |
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1003 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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1004 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1005 addr_3, b_start_3, p); |
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1006 *failures = true; |
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1007 return; |
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1008 } |
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1009 } |
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1010 |
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1011 // Loook up end - 1 |
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1012 HeapWord* addr_4 = the_end - 1; |
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1013 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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1014 if (b_start_4 != p) { |
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1015 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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1016 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1017 addr_4, b_start_4, p); |
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1018 *failures = true; |
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1019 return; |
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1020 } |
342 | 1021 } |
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1022 |
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1023 if (is_humongous && object_num > 1) { |
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1024 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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1025 "but has "SIZE_FORMAT", objects", |
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1026 bottom(), end(), object_num); |
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1027 *failures = true; |
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1028 return; |
342 | 1029 } |
12080 | 1030 |
1031 verify_strong_code_roots(vo, failures); | |
1032 } | |
1033 | |
1034 void HeapRegion::verify() const { | |
1035 bool dummy = false; | |
1036 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); | |
342 | 1037 } |
1038 | |
1039 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
1040 // away eventually. | |
1041 | |
356 | 1042 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
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1043 set_top(bottom()); |
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1044 set_saved_mark_word(bottom()); |
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1045 CompactibleSpace::clear(mangle_space); |
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1046 reset_bot(); |
342 | 1047 } |
1048 | |
1049 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
1050 Space::set_bottom(new_bottom); | |
1051 _offsets.set_bottom(new_bottom); | |
1052 } | |
1053 | |
1054 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
1055 Space::set_end(new_end); | |
1056 _offsets.resize(new_end - bottom()); | |
1057 } | |
1058 | |
1059 void G1OffsetTableContigSpace::print() const { | |
1060 print_short(); | |
1061 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
1062 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
1063 bottom(), top(), _offsets.threshold(), end()); | |
1064 } | |
1065 | |
1066 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
1067 return _offsets.initialize_threshold(); | |
1068 } | |
1069 | |
1070 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
1071 HeapWord* end) { | |
1072 _offsets.alloc_block(start, end); | |
1073 return _offsets.threshold(); | |
1074 } | |
1075 | |
1076 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
1077 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1078 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
1079 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
1080 return top(); | |
1081 else | |
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1082 return Space::saved_mark_word(); |
342 | 1083 } |
1084 | |
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1085 void G1OffsetTableContigSpace::record_top_and_timestamp() { |
342 | 1086 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
1087 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
1088 | |
1089 if (_gc_time_stamp < curr_gc_time_stamp) { | |
1090 // The order of these is important, as another thread might be | |
1091 // about to start scanning this region. If it does so after | |
1092 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
1093 // will be false, and it will pick up top() as the high water mark | |
1094 // of region. If it does so after _gc_time_stamp = ..., then it | |
1095 // will pick up the right saved_mark_word() as the high water mark | |
1096 // of the region. Either way, the behaviour will be correct. | |
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1097 Space::set_saved_mark_word(top()); |
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1098 OrderAccess::storestore(); |
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1099 _gc_time_stamp = curr_gc_time_stamp; |
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1100 // No need to do another barrier to flush the writes above. If |
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1101 // this is called in parallel with other threads trying to |
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1102 // allocate into the region, the caller should call this while |
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1103 // holding a lock and when the lock is released the writes will be |
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1104 // flushed. |
342 | 1105 } |
1106 } | |
1107 | |
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1108 void G1OffsetTableContigSpace::safe_object_iterate(ObjectClosure* blk) { |
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1109 object_iterate(blk); |
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1110 } |
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1111 |
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1112 void G1OffsetTableContigSpace::object_iterate(ObjectClosure* blk) { |
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1113 HeapWord* p = bottom(); |
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1114 while (p < top()) { |
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1115 if (block_is_obj(p)) { |
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1116 blk->do_object(oop(p)); |
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1117 } |
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1118 p += block_size(p); |
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1119 } |
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1120 } |
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1121 |
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1122 #define block_is_always_obj(q) true |
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1123 void G1OffsetTableContigSpace::prepare_for_compaction(CompactPoint* cp) { |
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1124 SCAN_AND_FORWARD(cp, top, block_is_always_obj, block_size); |
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1125 } |
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1126 #undef block_is_always_obj |
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1127 |
342 | 1128 G1OffsetTableContigSpace:: |
1129 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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1130 MemRegion mr) : |
342 | 1131 _offsets(sharedOffsetArray, mr), |
1132 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
1133 _gc_time_stamp(0) | |
1134 { | |
1135 _offsets.set_space(this); | |
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1136 } |
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1137 |
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1138 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
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1139 CompactibleSpace::initialize(mr, clear_space, mangle_space); |
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1140 _top = bottom(); |
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1141 reset_bot(); |
342 | 1142 } |
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1143 |