Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 20274:a8137787acfe
8047821: G1 Does not use the save_marks functionality as intended
Summary: Rename save_marks to record_top_and_timestamp and remove som unused but related methods
Reviewed-by: stefank, ehelin
| author | mgerdin |
|---|---|
| date | Thu, 26 Jun 2014 10:00:00 +0200 |
| parents | e635a728f9da |
| children | 1526a938e670 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 12080 | 26 #include "code/nmethod.hpp" |
| 1972 | 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
| 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 29 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 30 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
| 31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 33 #include "memory/genOopClosures.inline.hpp" | |
| 34 #include "memory/iterator.hpp" | |
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35 #include "memory/space.inline.hpp" |
| 1972 | 36 #include "oops/oop.inline.hpp" |
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37 #include "runtime/orderAccess.inline.hpp" |
| 342 | 38 |
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39 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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40 |
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41 int HeapRegion::LogOfHRGrainBytes = 0; |
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42 int HeapRegion::LogOfHRGrainWords = 0; |
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43 size_t HeapRegion::GrainBytes = 0; |
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44 size_t HeapRegion::GrainWords = 0; |
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45 size_t HeapRegion::CardsPerRegion = 0; |
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46 |
| 342 | 47 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
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48 HeapRegion* hr, ExtendedOopClosure* cl, |
| 342 | 49 CardTableModRefBS::PrecisionStyle precision, |
| 50 FilterKind fk) : | |
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51 DirtyCardToOopClosure(hr, cl, precision, NULL), |
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52 _hr(hr), _fk(fk), _g1(g1) { } |
| 342 | 53 |
| 54 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
| 55 OopClosure* oc) : | |
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56 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
| 342 | 57 |
| 58 template<class ClosureType> | |
| 59 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
| 60 HeapRegion* hr, | |
| 61 HeapWord* cur, HeapWord* top) { | |
| 62 oop cur_oop = oop(cur); | |
| 63 int oop_size = cur_oop->size(); | |
| 64 HeapWord* next_obj = cur + oop_size; | |
| 65 while (next_obj < top) { | |
| 66 // Keep filtering the remembered set. | |
| 67 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
| 68 // Bottom lies entirely below top, so we can call the | |
| 69 // non-memRegion version of oop_iterate below. | |
| 70 cur_oop->oop_iterate(cl); | |
| 71 } | |
| 72 cur = next_obj; | |
| 73 cur_oop = oop(cur); | |
| 74 oop_size = cur_oop->size(); | |
| 75 next_obj = cur + oop_size; | |
| 76 } | |
| 77 return cur; | |
| 78 } | |
| 79 | |
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80 void HeapRegionDCTOC::walk_mem_region(MemRegion mr, |
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81 HeapWord* bottom, |
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82 HeapWord* top) { |
| 342 | 83 G1CollectedHeap* g1h = _g1; |
| 84 int oop_size; | |
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85 ExtendedOopClosure* cl2 = NULL; |
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86 |
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87 FilterIntoCSClosure intoCSFilt(this, g1h, _cl); |
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88 FilterOutOfRegionClosure outOfRegionFilt(_hr, _cl); |
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89 |
| 342 | 90 switch (_fk) { |
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91 case NoFilterKind: cl2 = _cl; break; |
| 342 | 92 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
| 93 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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94 default: ShouldNotReachHere(); |
| 342 | 95 } |
| 96 | |
| 97 // Start filtering what we add to the remembered set. If the object is | |
| 98 // not considered dead, either because it is marked (in the mark bitmap) | |
| 99 // or it was allocated after marking finished, then we add it. Otherwise | |
| 100 // we can safely ignore the object. | |
| 101 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 102 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 103 } else { | |
| 104 oop_size = oop(bottom)->size(); | |
| 105 } | |
| 106 | |
| 107 bottom += oop_size; | |
| 108 | |
| 109 if (bottom < top) { | |
| 110 // We replicate the loop below for several kinds of possible filters. | |
| 111 switch (_fk) { | |
| 112 case NoFilterKind: | |
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113 bottom = walk_mem_region_loop(_cl, g1h, _hr, bottom, top); |
| 342 | 114 break; |
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115 |
| 342 | 116 case IntoCSFilterKind: { |
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117 FilterIntoCSClosure filt(this, g1h, _cl); |
| 342 | 118 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
| 119 break; | |
| 120 } | |
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121 |
| 342 | 122 case OutOfRegionFilterKind: { |
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123 FilterOutOfRegionClosure filt(_hr, _cl); |
| 342 | 124 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
| 125 break; | |
| 126 } | |
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127 |
| 342 | 128 default: |
| 129 ShouldNotReachHere(); | |
| 130 } | |
| 131 | |
| 132 // Last object. Need to do dead-obj filtering here too. | |
| 133 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 134 oop(bottom)->oop_iterate(cl2, mr); | |
| 135 } | |
| 136 } | |
| 137 } | |
| 138 | |
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139 // Minimum region size; we won't go lower than that. |
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140 // We might want to decrease this in the future, to deal with small |
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141 // heaps a bit more efficiently. |
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142 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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143 |
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144 // Maximum region size; we don't go higher than that. There's a good |
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145 // reason for having an upper bound. We don't want regions to get too |
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146 // large, otherwise cleanup's effectiveness would decrease as there |
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147 // will be fewer opportunities to find totally empty regions after |
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148 // marking. |
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149 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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150 |
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151 // The automatic region size calculation will try to have around this |
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152 // many regions in the heap (based on the min heap size). |
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153 #define TARGET_REGION_NUMBER 2048 |
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154 |
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155 size_t HeapRegion::max_region_size() { |
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156 return (size_t)MAX_REGION_SIZE; |
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157 } |
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158 |
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159 void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) { |
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160 uintx region_size = G1HeapRegionSize; |
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161 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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162 size_t average_heap_size = (initial_heap_size + max_heap_size) / 2; |
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163 region_size = MAX2(average_heap_size / TARGET_REGION_NUMBER, |
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164 (uintx) MIN_REGION_SIZE); |
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165 } |
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166 |
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167 int region_size_log = log2_long((jlong) region_size); |
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168 // Recalculate the region size to make sure it's a power of |
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169 // 2. This means that region_size is the largest power of 2 that's |
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170 // <= what we've calculated so far. |
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171 region_size = ((uintx)1 << region_size_log); |
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172 |
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173 // Now make sure that we don't go over or under our limits. |
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174 if (region_size < MIN_REGION_SIZE) { |
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175 region_size = MIN_REGION_SIZE; |
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176 } else if (region_size > MAX_REGION_SIZE) { |
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177 region_size = MAX_REGION_SIZE; |
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178 } |
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179 |
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180 // And recalculate the log. |
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181 region_size_log = log2_long((jlong) region_size); |
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182 |
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183 // Now, set up the globals. |
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184 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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185 LogOfHRGrainBytes = region_size_log; |
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186 |
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187 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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188 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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189 |
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190 guarantee(GrainBytes == 0, "we should only set it once"); |
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191 // The cast to int is safe, given that we've bounded region_size by |
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192 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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193 GrainBytes = (size_t)region_size; |
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194 |
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195 guarantee(GrainWords == 0, "we should only set it once"); |
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196 GrainWords = GrainBytes >> LogHeapWordSize; |
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197 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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198 |
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199 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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200 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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201 } |
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202 |
| 342 | 203 void HeapRegion::reset_after_compaction() { |
| 204 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 205 // After a compaction the mark bitmap is invalid, so we must | |
| 206 // treat all objects as being inside the unmarked area. | |
| 207 zero_marked_bytes(); | |
| 208 init_top_at_mark_start(); | |
| 209 } | |
| 210 | |
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211 void HeapRegion::hr_clear(bool par, bool clear_space, bool locked) { |
| 2152 | 212 assert(_humongous_type == NotHumongous, |
| 213 "we should have already filtered out humongous regions"); | |
| 214 assert(_humongous_start_region == NULL, | |
| 215 "we should have already filtered out humongous regions"); | |
| 216 assert(_end == _orig_end, | |
| 217 "we should have already filtered out humongous regions"); | |
| 218 | |
| 342 | 219 _in_collection_set = false; |
| 220 | |
| 221 set_young_index_in_cset(-1); | |
| 222 uninstall_surv_rate_group(); | |
| 223 set_young_type(NotYoung); | |
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224 reset_pre_dummy_top(); |
| 342 | 225 |
| 226 if (!par) { | |
| 227 // If this is parallel, this will be done later. | |
| 228 HeapRegionRemSet* hrrs = rem_set(); | |
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229 if (locked) { |
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230 hrrs->clear_locked(); |
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231 } else { |
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232 hrrs->clear(); |
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233 } |
| 355 | 234 _claimed = InitialClaimValue; |
| 342 | 235 } |
| 236 zero_marked_bytes(); | |
| 237 | |
| 238 _offsets.resize(HeapRegion::GrainWords); | |
| 239 init_top_at_mark_start(); | |
| 356 | 240 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 241 } |
| 242 | |
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243 void HeapRegion::par_clear() { |
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244 assert(used() == 0, "the region should have been already cleared"); |
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245 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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246 HeapRegionRemSet* hrrs = rem_set(); |
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247 hrrs->clear(); |
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248 CardTableModRefBS* ct_bs = |
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249 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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250 ct_bs->clear(MemRegion(bottom(), end())); |
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251 } |
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252 |
| 342 | 253 void HeapRegion::calc_gc_efficiency() { |
| 6611 | 254 // GC efficiency is the ratio of how much space would be |
| 255 // reclaimed over how long we predict it would take to reclaim it. | |
| 342 | 256 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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257 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 6611 | 258 |
| 259 // Retrieve a prediction of the elapsed time for this region for | |
| 260 // a mixed gc because the region will only be evacuated during a | |
| 261 // mixed gc. | |
| 262 double region_elapsed_time_ms = | |
| 263 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
| 264 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
| 342 | 265 } |
| 266 | |
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267 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
| 2152 | 268 assert(!isHumongous(), "sanity / pre-condition"); |
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269 assert(end() == _orig_end, |
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270 "Should be normal before the humongous object allocation"); |
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271 assert(top() == bottom(), "should be empty"); |
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272 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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273 |
| 355 | 274 _humongous_type = StartsHumongous; |
| 342 | 275 _humongous_start_region = this; |
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276 |
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277 set_end(new_end); |
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278 _offsets.set_for_starts_humongous(new_top); |
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279 } |
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280 |
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281 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
| 2152 | 282 assert(!isHumongous(), "sanity / pre-condition"); |
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283 assert(end() == _orig_end, |
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284 "Should be normal before the humongous object allocation"); |
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285 assert(top() == bottom(), "should be empty"); |
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286 assert(first_hr->startsHumongous(), "pre-condition"); |
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287 |
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288 _humongous_type = ContinuesHumongous; |
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289 _humongous_start_region = first_hr; |
| 342 | 290 } |
| 291 | |
| 2152 | 292 void HeapRegion::set_notHumongous() { |
| 293 assert(isHumongous(), "pre-condition"); | |
| 294 | |
| 295 if (startsHumongous()) { | |
| 296 assert(top() <= end(), "pre-condition"); | |
| 297 set_end(_orig_end); | |
| 298 if (top() > end()) { | |
| 299 // at least one "continues humongous" region after it | |
| 300 set_top(end()); | |
| 301 } | |
| 302 } else { | |
| 303 // continues humongous | |
| 304 assert(end() == _orig_end, "sanity"); | |
| 305 } | |
| 306 | |
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307 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
| 2152 | 308 _humongous_type = NotHumongous; |
| 309 _humongous_start_region = NULL; | |
| 310 } | |
| 311 | |
| 342 | 312 bool HeapRegion::claimHeapRegion(jint claimValue) { |
| 313 jint current = _claimed; | |
| 314 if (current != claimValue) { | |
| 315 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 316 if (res == current) { | |
| 317 return true; | |
| 318 } | |
| 319 } | |
| 320 return false; | |
| 321 } | |
| 322 | |
| 323 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
| 324 HeapWord* low = addr; | |
| 325 HeapWord* high = end(); | |
| 326 while (low < high) { | |
| 327 size_t diff = pointer_delta(high, low); | |
| 328 // Must add one below to bias toward the high amount. Otherwise, if | |
| 329 // "high" were at the desired value, and "low" were one less, we | |
| 330 // would not converge on "high". This is not symmetric, because | |
| 331 // we set "high" to a block start, which might be the right one, | |
| 332 // which we don't do for "low". | |
| 333 HeapWord* middle = low + (diff+1)/2; | |
| 334 if (middle == high) return high; | |
| 335 HeapWord* mid_bs = block_start_careful(middle); | |
| 336 if (mid_bs < addr) { | |
| 337 low = middle; | |
| 338 } else { | |
| 339 high = mid_bs; | |
| 340 } | |
| 341 } | |
| 342 assert(low == high && low >= addr, "Didn't work."); | |
| 343 return low; | |
| 344 } | |
| 345 | |
| 346 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 347 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 348 #endif // _MSC_VER | |
| 349 | |
| 350 | |
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351 HeapRegion::HeapRegion(uint hrs_index, |
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352 G1BlockOffsetSharedArray* sharedOffsetArray, |
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353 MemRegion mr) : |
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354 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
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355 _hrs_index(hrs_index), |
| 355 | 356 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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357 _in_collection_set(false), |
| 342 | 358 _next_in_special_set(NULL), _orig_end(NULL), |
| 355 | 359 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 6011 | 360 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
| 342 | 361 _young_type(NotYoung), _next_young_region(NULL), |
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362 _next_dirty_cards_region(NULL), _next(NULL), _prev(NULL), _pending_removal(false), |
| 2152 | 363 #ifdef ASSERT |
| 364 _containing_set(NULL), | |
| 365 #endif // ASSERT | |
| 366 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
| 367 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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368 _predicted_bytes_to_copy(0) |
| 342 | 369 { |
| 12080 | 370 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
| 342 | 371 _orig_end = mr.end(); |
| 372 // Note that initialize() will set the start of the unmarked area of the | |
| 373 // region. | |
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374 hr_clear(false /*par*/, false /*clear_space*/); |
| 356 | 375 set_top(bottom()); |
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376 record_top_and_timestamp(); |
| 342 | 377 |
| 378 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
| 379 } | |
| 380 | |
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381 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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382 // We're not using an iterator given that it will wrap around when |
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383 // it reaches the last region and this is not what we want here. |
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384 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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385 uint index = hrs_index() + 1; |
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386 while (index < g1h->n_regions()) { |
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387 HeapRegion* hr = g1h->region_at(index); |
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388 if (!hr->isHumongous()) { |
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389 return hr; |
| 342 | 390 } |
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391 index += 1; |
| 342 | 392 } |
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393 return NULL; |
| 342 | 394 } |
| 395 | |
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396 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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397 bool during_conc_mark) { |
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398 // We always recreate the prev marking info and we'll explicitly |
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399 // mark all objects we find to be self-forwarded on the prev |
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400 // bitmap. So all objects need to be below PTAMS. |
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401 _prev_top_at_mark_start = top(); |
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402 _prev_marked_bytes = 0; |
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403 |
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404 if (during_initial_mark) { |
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405 // During initial-mark, we'll also explicitly mark all objects |
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406 // we find to be self-forwarded on the next bitmap. So all |
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407 // objects need to be below NTAMS. |
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408 _next_top_at_mark_start = top(); |
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409 _next_marked_bytes = 0; |
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410 } else if (during_conc_mark) { |
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411 // During concurrent mark, all objects in the CSet (including |
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412 // the ones we find to be self-forwarded) are implicitly live. |
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413 // So all objects need to be above NTAMS. |
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414 _next_top_at_mark_start = bottom(); |
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415 _next_marked_bytes = 0; |
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416 } |
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417 } |
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418 |
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419 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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420 bool during_conc_mark, |
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421 size_t marked_bytes) { |
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422 assert(0 <= marked_bytes && marked_bytes <= used(), |
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423 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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424 marked_bytes, used())); |
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425 _prev_marked_bytes = marked_bytes; |
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426 } |
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427 |
| 342 | 428 HeapWord* |
| 429 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 430 ObjectClosure* cl) { | |
| 431 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 432 // We used to use "block_start_careful" here. But we're actually happy | |
| 433 // to update the BOT while we do this... | |
| 434 HeapWord* cur = block_start(mr.start()); | |
| 435 mr = mr.intersection(used_region()); | |
| 436 if (mr.is_empty()) return NULL; | |
| 437 // Otherwise, find the obj that extends onto mr.start(). | |
| 438 | |
| 439 assert(cur <= mr.start() | |
|
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440 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 441 cur + oop(cur)->size() > mr.start()), |
| 442 "postcondition of block_start"); | |
| 443 oop obj; | |
| 444 while (cur < mr.end()) { | |
| 445 obj = oop(cur); | |
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446 if (obj->klass_or_null() == NULL) { |
| 342 | 447 // Ran into an unparseable point. |
| 448 return cur; | |
| 449 } else if (!g1h->is_obj_dead(obj)) { | |
| 450 cl->do_object(obj); | |
| 451 } | |
| 452 if (cl->abort()) return cur; | |
| 453 // The check above must occur before the operation below, since an | |
| 454 // abort might invalidate the "size" operation. | |
| 455 cur += obj->size(); | |
| 456 } | |
| 457 return NULL; | |
| 458 } | |
| 459 | |
| 460 HeapWord* | |
| 461 HeapRegion:: | |
| 462 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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463 FilterOutOfRegionClosure* cl, |
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464 bool filter_young, |
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465 jbyte* card_ptr) { |
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466 // Currently, we should only have to clean the card if filter_young |
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467 // is true and vice versa. |
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468 if (filter_young) { |
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469 assert(card_ptr != NULL, "pre-condition"); |
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470 } else { |
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471 assert(card_ptr == NULL, "pre-condition"); |
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472 } |
| 342 | 473 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 474 | |
| 475 // If we're within a stop-world GC, then we might look at a card in a | |
| 476 // GC alloc region that extends onto a GC LAB, which may not be | |
| 477 // parseable. Stop such at the "saved_mark" of the region. | |
| 4839 | 478 if (g1h->is_gc_active()) { |
| 342 | 479 mr = mr.intersection(used_region_at_save_marks()); |
| 480 } else { | |
| 481 mr = mr.intersection(used_region()); | |
| 482 } | |
| 483 if (mr.is_empty()) return NULL; | |
| 484 // Otherwise, find the obj that extends onto mr.start(). | |
| 485 | |
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486 // The intersection of the incoming mr (for the card) and the |
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487 // allocated part of the region is non-empty. This implies that |
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488 // we have actually allocated into this region. The code in |
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489 // G1CollectedHeap.cpp that allocates a new region sets the |
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490 // is_young tag on the region before allocating. Thus we |
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491 // safely know if this region is young. |
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492 if (is_young() && filter_young) { |
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493 return NULL; |
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494 } |
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495 |
| 1705 | 496 assert(!is_young(), "check value of filter_young"); |
| 497 | |
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498 // We can only clean the card here, after we make the decision that |
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499 // the card is not young. And we only clean the card if we have been |
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500 // asked to (i.e., card_ptr != NULL). |
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501 if (card_ptr != NULL) { |
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502 *card_ptr = CardTableModRefBS::clean_card_val(); |
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503 // We must complete this write before we do any of the reads below. |
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504 OrderAccess::storeload(); |
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505 } |
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506 |
| 4839 | 507 // Cache the boundaries of the memory region in some const locals |
| 508 HeapWord* const start = mr.start(); | |
| 509 HeapWord* const end = mr.end(); | |
| 510 | |
| 342 | 511 // We used to use "block_start_careful" here. But we're actually happy |
| 512 // to update the BOT while we do this... | |
| 4839 | 513 HeapWord* cur = block_start(start); |
| 514 assert(cur <= start, "Postcondition"); | |
| 515 | |
| 516 oop obj; | |
| 342 | 517 |
| 4839 | 518 HeapWord* next = cur; |
| 519 while (next <= start) { | |
| 520 cur = next; | |
| 521 obj = oop(cur); | |
| 522 if (obj->klass_or_null() == NULL) { | |
| 342 | 523 // Ran into an unparseable point. |
| 524 return cur; | |
| 525 } | |
| 526 // Otherwise... | |
| 4839 | 527 next = (cur + obj->size()); |
| 342 | 528 } |
| 4839 | 529 |
| 530 // If we finish the above loop...We have a parseable object that | |
| 531 // begins on or before the start of the memory region, and ends | |
| 532 // inside or spans the entire region. | |
| 533 | |
| 534 assert(obj == oop(cur), "sanity"); | |
| 535 assert(cur <= start && | |
| 536 obj->klass_or_null() != NULL && | |
| 537 (cur + obj->size()) > start, | |
| 342 | 538 "Loop postcondition"); |
| 4839 | 539 |
| 342 | 540 if (!g1h->is_obj_dead(obj)) { |
| 541 obj->oop_iterate(cl, mr); | |
| 542 } | |
| 543 | |
| 4839 | 544 while (cur < end) { |
| 342 | 545 obj = oop(cur); |
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546 if (obj->klass_or_null() == NULL) { |
| 342 | 547 // Ran into an unparseable point. |
| 548 return cur; | |
| 549 }; | |
| 4839 | 550 |
| 342 | 551 // Otherwise: |
| 552 next = (cur + obj->size()); | |
| 4839 | 553 |
| 342 | 554 if (!g1h->is_obj_dead(obj)) { |
| 4839 | 555 if (next < end || !obj->is_objArray()) { |
| 556 // This object either does not span the MemRegion | |
| 557 // boundary, or if it does it's not an array. | |
| 558 // Apply closure to whole object. | |
| 342 | 559 obj->oop_iterate(cl); |
| 560 } else { | |
| 4839 | 561 // This obj is an array that spans the boundary. |
| 562 // Stop at the boundary. | |
| 563 obj->oop_iterate(cl, mr); | |
| 342 | 564 } |
| 565 } | |
| 566 cur = next; | |
| 567 } | |
| 568 return NULL; | |
| 569 } | |
| 570 | |
| 12080 | 571 // Code roots support |
| 572 | |
| 573 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
| 574 HeapRegionRemSet* hrrs = rem_set(); | |
| 575 hrrs->add_strong_code_root(nm); | |
| 576 } | |
| 577 | |
| 578 void HeapRegion::remove_strong_code_root(nmethod* nm) { | |
| 579 HeapRegionRemSet* hrrs = rem_set(); | |
| 580 hrrs->remove_strong_code_root(nm); | |
| 581 } | |
| 582 | |
| 583 void HeapRegion::migrate_strong_code_roots() { | |
| 584 assert(in_collection_set(), "only collection set regions"); | |
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585 assert(!isHumongous(), |
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586 err_msg("humongous region "HR_FORMAT" should not have been added to collection set", |
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587 HR_FORMAT_PARAMS(this))); |
| 12080 | 588 |
| 589 HeapRegionRemSet* hrrs = rem_set(); | |
| 590 hrrs->migrate_strong_code_roots(); | |
| 591 } | |
| 592 | |
| 593 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
| 594 HeapRegionRemSet* hrrs = rem_set(); | |
| 595 hrrs->strong_code_roots_do(blk); | |
| 596 } | |
| 597 | |
| 598 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
| 599 const HeapRegion* _hr; | |
| 600 nmethod* _nm; | |
| 601 bool _failures; | |
| 602 bool _has_oops_in_region; | |
| 603 | |
| 604 template <class T> void do_oop_work(T* p) { | |
| 605 T heap_oop = oopDesc::load_heap_oop(p); | |
| 606 if (!oopDesc::is_null(heap_oop)) { | |
| 607 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 608 | |
| 609 // Note: not all the oops embedded in the nmethod are in the | |
| 610 // current region. We only look at those which are. | |
| 611 if (_hr->is_in(obj)) { | |
| 612 // Object is in the region. Check that its less than top | |
| 613 if (_hr->top() <= (HeapWord*)obj) { | |
| 614 // Object is above top | |
| 615 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
| 616 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
| 617 "top "PTR_FORMAT, | |
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618 (void *)obj, _hr->bottom(), _hr->end(), _hr->top()); |
| 12080 | 619 _failures = true; |
| 620 return; | |
| 621 } | |
| 622 // Nmethod has at least one oop in the current region | |
| 623 _has_oops_in_region = true; | |
| 624 } | |
| 625 } | |
| 626 } | |
| 627 | |
| 628 public: | |
| 629 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
| 630 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
| 631 | |
| 632 void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 633 void do_oop(oop* p) { do_oop_work(p); } | |
| 634 | |
| 635 bool failures() { return _failures; } | |
| 636 bool has_oops_in_region() { return _has_oops_in_region; } | |
| 637 }; | |
| 638 | |
| 639 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
| 640 const HeapRegion* _hr; | |
| 641 bool _failures; | |
| 642 public: | |
| 643 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
| 644 _hr(hr), _failures(false) {} | |
| 645 | |
| 646 void do_code_blob(CodeBlob* cb) { | |
| 647 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
| 648 if (nm != NULL) { | |
| 649 // Verify that the nemthod is live | |
| 650 if (!nm->is_alive()) { | |
| 651 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
| 652 PTR_FORMAT" in its strong code roots", | |
| 653 _hr->bottom(), _hr->end(), nm); | |
| 654 _failures = true; | |
| 655 } else { | |
| 656 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
| 657 nm->oops_do(&oop_cl); | |
| 658 if (!oop_cl.has_oops_in_region()) { | |
| 659 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
| 660 PTR_FORMAT" in its strong code roots " | |
| 661 "with no pointers into region", | |
| 662 _hr->bottom(), _hr->end(), nm); | |
| 663 _failures = true; | |
| 664 } else if (oop_cl.failures()) { | |
| 665 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
| 666 "failures for nmethod "PTR_FORMAT, | |
| 667 _hr->bottom(), _hr->end(), nm); | |
| 668 _failures = true; | |
| 669 } | |
| 670 } | |
| 671 } | |
| 672 } | |
| 673 | |
| 674 bool failures() { return _failures; } | |
| 675 }; | |
| 676 | |
| 677 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
| 678 if (!G1VerifyHeapRegionCodeRoots) { | |
| 679 // We're not verifying code roots. | |
| 680 return; | |
| 681 } | |
| 682 if (vo == VerifyOption_G1UseMarkWord) { | |
| 683 // Marking verification during a full GC is performed after class | |
| 684 // unloading, code cache unloading, etc so the strong code roots | |
| 685 // attached to each heap region are in an inconsistent state. They won't | |
| 686 // be consistent until the strong code roots are rebuilt after the | |
| 687 // actual GC. Skip verifying the strong code roots in this particular | |
| 688 // time. | |
| 689 assert(VerifyDuringGC, "only way to get here"); | |
| 690 return; | |
| 691 } | |
| 692 | |
| 693 HeapRegionRemSet* hrrs = rem_set(); | |
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694 size_t strong_code_roots_length = hrrs->strong_code_roots_list_length(); |
| 12080 | 695 |
| 696 // if this region is empty then there should be no entries | |
| 697 // on its strong code root list | |
| 698 if (is_empty()) { | |
| 699 if (strong_code_roots_length > 0) { | |
| 700 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
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701 "but has "SIZE_FORMAT" code root entries", |
| 12080 | 702 bottom(), end(), strong_code_roots_length); |
| 703 *failures = true; | |
| 704 } | |
| 705 return; | |
| 706 } | |
| 707 | |
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708 if (continuesHumongous()) { |
| 12080 | 709 if (strong_code_roots_length > 0) { |
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710 gclog_or_tty->print_cr("region "HR_FORMAT" is a continuation of a humongous " |
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711 "region but has "SIZE_FORMAT" code root entries", |
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712 HR_FORMAT_PARAMS(this), strong_code_roots_length); |
| 12080 | 713 *failures = true; |
| 714 } | |
| 715 return; | |
| 716 } | |
| 717 | |
| 718 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
| 719 strong_code_roots_do(&cb_cl); | |
| 720 | |
| 721 if (cb_cl.failures()) { | |
| 722 *failures = true; | |
| 723 } | |
| 724 } | |
| 725 | |
| 342 | 726 void HeapRegion::print() const { print_on(gclog_or_tty); } |
| 727 void HeapRegion::print_on(outputStream* st) const { | |
| 728 if (isHumongous()) { | |
| 729 if (startsHumongous()) | |
| 730 st->print(" HS"); | |
| 731 else | |
| 732 st->print(" HC"); | |
| 733 } else { | |
| 734 st->print(" "); | |
| 735 } | |
| 736 if (in_collection_set()) | |
| 737 st->print(" CS"); | |
| 738 else | |
| 739 st->print(" "); | |
| 740 if (is_young()) | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1388
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|
741 st->print(is_survivor() ? " SU" : " Y "); |
| 342 | 742 else |
| 743 st->print(" "); | |
| 744 if (is_empty()) | |
| 745 st->print(" F"); | |
| 746 else | |
| 747 st->print(" "); | |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
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4023
diff
changeset
|
748 st->print(" TS %5d", _gc_time_stamp); |
| 1388 | 749 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 750 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 751 G1OffsetTableContigSpace::print_on(st); |
| 752 } | |
| 753 | |
| 12080 | 754 class VerifyLiveClosure: public OopClosure { |
| 755 private: | |
| 756 G1CollectedHeap* _g1h; | |
| 757 CardTableModRefBS* _bs; | |
| 758 oop _containing_obj; | |
| 759 bool _failures; | |
| 760 int _n_failures; | |
| 761 VerifyOption _vo; | |
| 762 public: | |
| 763 // _vo == UsePrevMarking -> use "prev" marking information, | |
| 764 // _vo == UseNextMarking -> use "next" marking information, | |
| 765 // _vo == UseMarkWord -> use mark word from object header. | |
| 766 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
| 767 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
| 768 _failures(false), _n_failures(0), _vo(vo) | |
| 769 { | |
| 770 BarrierSet* bs = _g1h->barrier_set(); | |
| 771 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 772 _bs = (CardTableModRefBS*)bs; | |
| 773 } | |
| 774 | |
| 775 void set_containing_obj(oop obj) { | |
| 776 _containing_obj = obj; | |
| 777 } | |
| 778 | |
| 779 bool failures() { return _failures; } | |
| 780 int n_failures() { return _n_failures; } | |
| 781 | |
| 782 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 783 virtual void do_oop( oop* p) { do_oop_work(p); } | |
| 784 | |
| 785 void print_object(outputStream* out, oop obj) { | |
| 786 #ifdef PRODUCT | |
| 787 Klass* k = obj->klass(); | |
| 788 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
| 789 out->print_cr("class name %s", class_name); | |
| 790 #else // PRODUCT | |
| 791 obj->print_on(out); | |
| 792 #endif // PRODUCT | |
| 793 } | |
| 794 | |
| 795 template <class T> | |
| 796 void do_oop_work(T* p) { | |
| 797 assert(_containing_obj != NULL, "Precondition"); | |
| 798 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
| 799 "Precondition"); | |
| 800 T heap_oop = oopDesc::load_heap_oop(p); | |
| 801 if (!oopDesc::is_null(heap_oop)) { | |
| 802 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 803 bool failed = false; | |
| 804 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
| 805 MutexLockerEx x(ParGCRareEvent_lock, | |
| 806 Mutex::_no_safepoint_check_flag); | |
| 807 | |
| 808 if (!_failures) { | |
|
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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changeset
|
809 gclog_or_tty->cr(); |
| 12080 | 810 gclog_or_tty->print_cr("----------"); |
| 811 } | |
| 812 if (!_g1h->is_in_closed_subset(obj)) { | |
| 813 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 814 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 815 " of live obj "PTR_FORMAT" in region " | |
| 816 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 817 p, (void*) _containing_obj, | |
| 818 from->bottom(), from->end()); | |
| 819 print_object(gclog_or_tty, _containing_obj); | |
| 820 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 821 (void*) obj); | |
| 822 } else { | |
| 823 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 824 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 825 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 826 " of live obj "PTR_FORMAT" in region " | |
| 827 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 828 p, (void*) _containing_obj, | |
| 829 from->bottom(), from->end()); | |
| 830 print_object(gclog_or_tty, _containing_obj); | |
| 831 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 832 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 833 (void*) obj, to->bottom(), to->end()); | |
| 834 print_object(gclog_or_tty, obj); | |
| 835 } | |
| 836 gclog_or_tty->print_cr("----------"); | |
| 837 gclog_or_tty->flush(); | |
| 838 _failures = true; | |
| 839 failed = true; | |
| 840 _n_failures++; | |
| 841 } | |
| 842 | |
| 843 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
| 844 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 845 HeapRegion* to = _g1h->heap_region_containing(obj); | |
| 846 if (from != NULL && to != NULL && | |
| 847 from != to && | |
| 848 !to->isHumongous()) { | |
| 849 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 850 jbyte cv_field = *_bs->byte_for_const(p); | |
| 851 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 852 | |
| 853 bool is_bad = !(from->is_young() | |
| 854 || to->rem_set()->contains_reference(p) | |
| 855 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 856 (_containing_obj->is_objArray() ? | |
| 857 cv_field == dirty | |
| 858 : cv_obj == dirty || cv_field == dirty)); | |
| 859 if (is_bad) { | |
| 860 MutexLockerEx x(ParGCRareEvent_lock, | |
| 861 Mutex::_no_safepoint_check_flag); | |
| 862 | |
| 863 if (!_failures) { | |
|
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parents:
17773
diff
changeset
|
864 gclog_or_tty->cr(); |
| 12080 | 865 gclog_or_tty->print_cr("----------"); |
| 866 } | |
| 867 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 868 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
| 869 "of obj "PTR_FORMAT", " | |
| 870 "in region "HR_FORMAT, | |
| 871 p, (void*) _containing_obj, | |
| 872 HR_FORMAT_PARAMS(from)); | |
| 873 _containing_obj->print_on(gclog_or_tty); | |
| 874 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
| 875 "in region "HR_FORMAT, | |
| 876 (void*) obj, | |
| 877 HR_FORMAT_PARAMS(to)); | |
| 878 obj->print_on(gclog_or_tty); | |
| 879 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 880 cv_obj, cv_field); | |
| 881 gclog_or_tty->print_cr("----------"); | |
| 882 gclog_or_tty->flush(); | |
| 883 _failures = true; | |
| 884 if (!failed) _n_failures++; | |
| 885 } | |
| 886 } | |
| 887 } | |
| 888 } | |
| 889 } | |
| 890 }; | |
| 811 | 891 |
| 342 | 892 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
| 893 // We would need a mechanism to make that code skip dead objects. | |
| 894 | |
| 6008 | 895 void HeapRegion::verify(VerifyOption vo, |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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942
diff
changeset
|
896 bool* failures) const { |
| 342 | 897 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
1020
ff2402f6a50b
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parents:
942
diff
changeset
|
898 *failures = false; |
| 342 | 899 HeapWord* p = bottom(); |
| 900 HeapWord* prev_p = NULL; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
901 VerifyLiveClosure vl_cl(g1, vo); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
902 bool is_humongous = isHumongous(); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
903 bool do_bot_verify = !is_young(); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
904 size_t object_num = 0; |
| 342 | 905 while (p < top()) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
906 oop obj = oop(p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
907 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
908 object_num += 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
909 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
910 if (is_humongous != g1->isHumongous(obj_size)) { |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
911 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
|
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
912 SIZE_FORMAT" words) in a %shumongous region", |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
913 p, g1->isHumongous(obj_size) ? "" : "non-", |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
914 obj_size, is_humongous ? "" : "non-"); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
915 *failures = true; |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
916 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
917 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
918 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
919 // If it returns false, verify_for_object() will output the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
920 // appropriate messasge. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
921 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
922 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
923 return; |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
924 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
925 |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
926 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
927 if (obj->is_oop()) { |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
928 Klass* klass = obj->klass(); |
| 11034 | 929 if (!klass->is_metaspace_object()) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
930 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
|
931 "not metadata", klass, (void *)obj); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
932 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
933 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
934 } else if (!klass->is_klass()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
935 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
|
936 "not a klass", klass, (void *)obj); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
937 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
938 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
939 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
940 vl_cl.set_containing_obj(obj); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
941 obj->oop_iterate_no_header(&vl_cl); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
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
parents:
1972
diff
changeset
|
944 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
945 if (G1MaxVerifyFailures >= 0 && |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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
tonyp
parents:
1972
diff
changeset
|
949 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
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
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
957 p += obj_size; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
958 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
959 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
960 if (p != top()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
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
parents:
1972
diff
changeset
|
963 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
964 return; |
| 342 | 965 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
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
7007068: G1: refine the BOT during evac failure handling
tonyp
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
tonyp
parents:
1972
diff
changeset
|
975 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
|
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
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978 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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979 addr_1, b_start_1, p); |
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980 *failures = true; |
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981 return; |
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982 } |
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983 |
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984 // Look up top + 1 |
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985 HeapWord* addr_2 = p + 1; |
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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); |
|
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992 *failures = true; |
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993 return; |
|
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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) { |
| 1043 ContiguousSpace::clear(mangle_space); | |
| 342 | 1044 _offsets.zero_bottom_entry(); |
| 1045 _offsets.initialize_threshold(); | |
| 1046 } | |
| 1047 | |
| 1048 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 1049 Space::set_bottom(new_bottom); | |
| 1050 _offsets.set_bottom(new_bottom); | |
| 1051 } | |
| 1052 | |
| 1053 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 1054 Space::set_end(new_end); | |
| 1055 _offsets.resize(new_end - bottom()); | |
| 1056 } | |
| 1057 | |
| 1058 void G1OffsetTableContigSpace::print() const { | |
| 1059 print_short(); | |
| 1060 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 1061 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 1062 bottom(), top(), _offsets.threshold(), end()); | |
| 1063 } | |
| 1064 | |
| 1065 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 1066 return _offsets.initialize_threshold(); | |
| 1067 } | |
| 1068 | |
| 1069 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 1070 HeapWord* end) { | |
| 1071 _offsets.alloc_block(start, end); | |
| 1072 return _offsets.threshold(); | |
| 1073 } | |
| 1074 | |
| 1075 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 1076 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1077 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
| 1078 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
| 1079 return top(); | |
| 1080 else | |
| 1081 return ContiguousSpace::saved_mark_word(); | |
| 1082 } | |
| 1083 | |
|
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1084 void G1OffsetTableContigSpace::record_top_and_timestamp() { |
| 342 | 1085 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1086 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 1087 | |
| 1088 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 1089 // The order of these is important, as another thread might be | |
| 1090 // about to start scanning this region. If it does so after | |
| 1091 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 1092 // will be false, and it will pick up top() as the high water mark | |
| 1093 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 1094 // will pick up the right saved_mark_word() as the high water mark | |
| 1095 // of the region. Either way, the behaviour will be correct. | |
| 1096 ContiguousSpace::set_saved_mark(); | |
|
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1097 OrderAccess::storestore(); |
|
353
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1098 _gc_time_stamp = curr_gc_time_stamp; |
|
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1099 // No need to do another barrier to flush the writes above. If |
|
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1100 // this is called in parallel with other threads trying to |
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1101 // allocate into the region, the caller should call this while |
|
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1102 // holding a lock and when the lock is released the writes will be |
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1103 // flushed. |
| 342 | 1104 } |
| 1105 } | |
| 1106 | |
| 1107 G1OffsetTableContigSpace:: | |
| 1108 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
|
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1109 MemRegion mr) : |
| 342 | 1110 _offsets(sharedOffsetArray, mr), |
| 1111 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 1112 _gc_time_stamp(0) | |
| 1113 { | |
| 1114 _offsets.set_space(this); | |
|
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1115 // false ==> we'll do the clearing if there's clearing to be done. |
|
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1116 ContiguousSpace::initialize(mr, false, SpaceDecorator::Mangle); |
|
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1117 _offsets.zero_bottom_entry(); |
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1118 _offsets.initialize_threshold(); |
| 342 | 1119 } |