Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 12178:84683e78e713
8019902: G1: Use the average heap size rather than the minimum heap size to calculate the region size
Reviewed-by: tonyp, tschatzl, sjohanss
| author | brutisso |
|---|---|
| date | Fri, 30 Aug 2013 07:31:47 +0200 |
| parents | 5888334c9c24 |
| children | 40136aa2cdb1 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 12080 | 26 #include "code/nmethod.hpp" |
| 1972 | 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
| 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 29 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 30 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
| 31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 33 #include "memory/genOopClosures.inline.hpp" | |
| 34 #include "memory/iterator.hpp" | |
| 35 #include "oops/oop.inline.hpp" | |
| 342 | 36 |
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37 int HeapRegion::LogOfHRGrainBytes = 0; |
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38 int HeapRegion::LogOfHRGrainWords = 0; |
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39 size_t HeapRegion::GrainBytes = 0; |
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40 size_t HeapRegion::GrainWords = 0; |
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41 size_t HeapRegion::CardsPerRegion = 0; |
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42 |
| 342 | 43 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
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44 HeapRegion* hr, ExtendedOopClosure* cl, |
| 342 | 45 CardTableModRefBS::PrecisionStyle precision, |
| 46 FilterKind fk) : | |
| 47 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
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48 _hr(hr), _fk(fk), _g1(g1) { } |
| 342 | 49 |
| 50 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
| 51 OopClosure* oc) : | |
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52 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
| 342 | 53 |
| 54 template<class ClosureType> | |
| 55 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
| 56 HeapRegion* hr, | |
| 57 HeapWord* cur, HeapWord* top) { | |
| 58 oop cur_oop = oop(cur); | |
| 59 int oop_size = cur_oop->size(); | |
| 60 HeapWord* next_obj = cur + oop_size; | |
| 61 while (next_obj < top) { | |
| 62 // Keep filtering the remembered set. | |
| 63 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
| 64 // Bottom lies entirely below top, so we can call the | |
| 65 // non-memRegion version of oop_iterate below. | |
| 66 cur_oop->oop_iterate(cl); | |
| 67 } | |
| 68 cur = next_obj; | |
| 69 cur_oop = oop(cur); | |
| 70 oop_size = cur_oop->size(); | |
| 71 next_obj = cur + oop_size; | |
| 72 } | |
| 73 return cur; | |
| 74 } | |
| 75 | |
| 76 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
| 77 HeapWord* bottom, | |
| 78 HeapWord* top, | |
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79 ExtendedOopClosure* cl) { |
| 342 | 80 G1CollectedHeap* g1h = _g1; |
| 81 int oop_size; | |
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82 ExtendedOopClosure* cl2 = NULL; |
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83 |
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84 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
| 342 | 85 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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86 |
| 342 | 87 switch (_fk) { |
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88 case NoFilterKind: cl2 = cl; break; |
| 342 | 89 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
| 90 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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91 default: ShouldNotReachHere(); |
| 342 | 92 } |
| 93 | |
| 94 // Start filtering what we add to the remembered set. If the object is | |
| 95 // not considered dead, either because it is marked (in the mark bitmap) | |
| 96 // or it was allocated after marking finished, then we add it. Otherwise | |
| 97 // we can safely ignore the object. | |
| 98 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 99 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 100 } else { | |
| 101 oop_size = oop(bottom)->size(); | |
| 102 } | |
| 103 | |
| 104 bottom += oop_size; | |
| 105 | |
| 106 if (bottom < top) { | |
| 107 // We replicate the loop below for several kinds of possible filters. | |
| 108 switch (_fk) { | |
| 109 case NoFilterKind: | |
| 110 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
| 111 break; | |
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112 |
| 342 | 113 case IntoCSFilterKind: { |
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114 FilterIntoCSClosure filt(this, g1h, cl); |
| 342 | 115 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
| 116 break; | |
| 117 } | |
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118 |
| 342 | 119 case OutOfRegionFilterKind: { |
| 120 FilterOutOfRegionClosure filt(_hr, cl); | |
| 121 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 122 break; | |
| 123 } | |
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124 |
| 342 | 125 default: |
| 126 ShouldNotReachHere(); | |
| 127 } | |
| 128 | |
| 129 // Last object. Need to do dead-obj filtering here too. | |
| 130 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 131 oop(bottom)->oop_iterate(cl2, mr); | |
| 132 } | |
| 133 } | |
| 134 } | |
| 135 | |
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136 // Minimum region size; we won't go lower than that. |
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137 // We might want to decrease this in the future, to deal with small |
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138 // heaps a bit more efficiently. |
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139 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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140 |
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141 // Maximum region size; we don't go higher than that. There's a good |
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142 // reason for having an upper bound. We don't want regions to get too |
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143 // large, otherwise cleanup's effectiveness would decrease as there |
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144 // will be fewer opportunities to find totally empty regions after |
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145 // marking. |
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146 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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147 |
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148 // The automatic region size calculation will try to have around this |
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149 // many regions in the heap (based on the min heap size). |
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150 #define TARGET_REGION_NUMBER 2048 |
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151 |
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152 void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) { |
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153 uintx region_size = G1HeapRegionSize; |
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154 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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155 size_t average_heap_size = (initial_heap_size + max_heap_size) / 2; |
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156 region_size = MAX2(average_heap_size / TARGET_REGION_NUMBER, |
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157 (uintx) MIN_REGION_SIZE); |
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158 } |
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159 |
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160 int region_size_log = log2_long((jlong) region_size); |
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161 // Recalculate the region size to make sure it's a power of |
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162 // 2. This means that region_size is the largest power of 2 that's |
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163 // <= what we've calculated so far. |
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164 region_size = ((uintx)1 << region_size_log); |
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165 |
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166 // Now make sure that we don't go over or under our limits. |
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167 if (region_size < MIN_REGION_SIZE) { |
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168 region_size = MIN_REGION_SIZE; |
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169 } else if (region_size > MAX_REGION_SIZE) { |
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170 region_size = MAX_REGION_SIZE; |
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171 } |
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172 |
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173 if (region_size != G1HeapRegionSize) { |
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174 // Update the flag to make sure that PrintFlagsFinal logs the correct value |
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175 FLAG_SET_ERGO(uintx, G1HeapRegionSize, region_size); |
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176 } |
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177 |
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178 // And recalculate the log. |
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179 region_size_log = log2_long((jlong) region_size); |
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180 |
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181 // Now, set up the globals. |
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182 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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183 LogOfHRGrainBytes = region_size_log; |
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184 |
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185 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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186 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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187 |
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188 guarantee(GrainBytes == 0, "we should only set it once"); |
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189 // The cast to int is safe, given that we've bounded region_size by |
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190 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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191 GrainBytes = (size_t)region_size; |
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192 |
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193 guarantee(GrainWords == 0, "we should only set it once"); |
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194 GrainWords = GrainBytes >> LogHeapWordSize; |
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195 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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196 |
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197 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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198 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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199 } |
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200 |
| 342 | 201 void HeapRegion::reset_after_compaction() { |
| 202 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 203 // After a compaction the mark bitmap is invalid, so we must | |
| 204 // treat all objects as being inside the unmarked area. | |
| 205 zero_marked_bytes(); | |
| 206 init_top_at_mark_start(); | |
| 207 } | |
| 208 | |
| 209 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
| 2152 | 210 assert(_humongous_type == NotHumongous, |
| 211 "we should have already filtered out humongous regions"); | |
| 212 assert(_humongous_start_region == NULL, | |
| 213 "we should have already filtered out humongous regions"); | |
| 214 assert(_end == _orig_end, | |
| 215 "we should have already filtered out humongous regions"); | |
| 216 | |
| 342 | 217 _in_collection_set = false; |
| 218 | |
| 219 set_young_index_in_cset(-1); | |
| 220 uninstall_surv_rate_group(); | |
| 221 set_young_type(NotYoung); | |
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222 reset_pre_dummy_top(); |
| 342 | 223 |
| 224 if (!par) { | |
| 225 // If this is parallel, this will be done later. | |
| 226 HeapRegionRemSet* hrrs = rem_set(); | |
| 12080 | 227 hrrs->clear(); |
| 355 | 228 _claimed = InitialClaimValue; |
| 342 | 229 } |
| 230 zero_marked_bytes(); | |
| 231 | |
| 232 _offsets.resize(HeapRegion::GrainWords); | |
| 233 init_top_at_mark_start(); | |
| 356 | 234 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 235 } |
| 236 | |
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237 void HeapRegion::par_clear() { |
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238 assert(used() == 0, "the region should have been already cleared"); |
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239 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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240 HeapRegionRemSet* hrrs = rem_set(); |
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241 hrrs->clear(); |
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242 CardTableModRefBS* ct_bs = |
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243 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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244 ct_bs->clear(MemRegion(bottom(), end())); |
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245 } |
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246 |
| 342 | 247 void HeapRegion::calc_gc_efficiency() { |
| 6611 | 248 // GC efficiency is the ratio of how much space would be |
| 249 // reclaimed over how long we predict it would take to reclaim it. | |
| 342 | 250 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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251 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 6611 | 252 |
| 253 // Retrieve a prediction of the elapsed time for this region for | |
| 254 // a mixed gc because the region will only be evacuated during a | |
| 255 // mixed gc. | |
| 256 double region_elapsed_time_ms = | |
| 257 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
| 258 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
| 342 | 259 } |
| 260 | |
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261 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
| 2152 | 262 assert(!isHumongous(), "sanity / pre-condition"); |
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263 assert(end() == _orig_end, |
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264 "Should be normal before the humongous object allocation"); |
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265 assert(top() == bottom(), "should be empty"); |
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266 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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267 |
| 355 | 268 _humongous_type = StartsHumongous; |
| 342 | 269 _humongous_start_region = this; |
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270 |
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271 set_end(new_end); |
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272 _offsets.set_for_starts_humongous(new_top); |
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273 } |
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274 |
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275 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
| 2152 | 276 assert(!isHumongous(), "sanity / pre-condition"); |
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277 assert(end() == _orig_end, |
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278 "Should be normal before the humongous object allocation"); |
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279 assert(top() == bottom(), "should be empty"); |
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280 assert(first_hr->startsHumongous(), "pre-condition"); |
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281 |
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282 _humongous_type = ContinuesHumongous; |
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283 _humongous_start_region = first_hr; |
| 342 | 284 } |
| 285 | |
| 2152 | 286 void HeapRegion::set_notHumongous() { |
| 287 assert(isHumongous(), "pre-condition"); | |
| 288 | |
| 289 if (startsHumongous()) { | |
| 290 assert(top() <= end(), "pre-condition"); | |
| 291 set_end(_orig_end); | |
| 292 if (top() > end()) { | |
| 293 // at least one "continues humongous" region after it | |
| 294 set_top(end()); | |
| 295 } | |
| 296 } else { | |
| 297 // continues humongous | |
| 298 assert(end() == _orig_end, "sanity"); | |
| 299 } | |
| 300 | |
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301 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
| 2152 | 302 _humongous_type = NotHumongous; |
| 303 _humongous_start_region = NULL; | |
| 304 } | |
| 305 | |
| 342 | 306 bool HeapRegion::claimHeapRegion(jint claimValue) { |
| 307 jint current = _claimed; | |
| 308 if (current != claimValue) { | |
| 309 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 310 if (res == current) { | |
| 311 return true; | |
| 312 } | |
| 313 } | |
| 314 return false; | |
| 315 } | |
| 316 | |
| 317 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
| 318 HeapWord* low = addr; | |
| 319 HeapWord* high = end(); | |
| 320 while (low < high) { | |
| 321 size_t diff = pointer_delta(high, low); | |
| 322 // Must add one below to bias toward the high amount. Otherwise, if | |
| 323 // "high" were at the desired value, and "low" were one less, we | |
| 324 // would not converge on "high". This is not symmetric, because | |
| 325 // we set "high" to a block start, which might be the right one, | |
| 326 // which we don't do for "low". | |
| 327 HeapWord* middle = low + (diff+1)/2; | |
| 328 if (middle == high) return high; | |
| 329 HeapWord* mid_bs = block_start_careful(middle); | |
| 330 if (mid_bs < addr) { | |
| 331 low = middle; | |
| 332 } else { | |
| 333 high = mid_bs; | |
| 334 } | |
| 335 } | |
| 336 assert(low == high && low >= addr, "Didn't work."); | |
| 337 return low; | |
| 338 } | |
| 339 | |
| 340 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 341 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 342 #endif // _MSC_VER | |
| 343 | |
| 344 | |
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345 HeapRegion::HeapRegion(uint hrs_index, |
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346 G1BlockOffsetSharedArray* sharedOffsetArray, |
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347 MemRegion mr) : |
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348 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
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349 _hrs_index(hrs_index), |
| 355 | 350 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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351 _in_collection_set(false), |
| 342 | 352 _next_in_special_set(NULL), _orig_end(NULL), |
| 355 | 353 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 6011 | 354 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
| 342 | 355 _young_type(NotYoung), _next_young_region(NULL), |
| 2152 | 356 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
| 357 #ifdef ASSERT | |
| 358 _containing_set(NULL), | |
| 359 #endif // ASSERT | |
| 360 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
| 361 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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362 _predicted_bytes_to_copy(0) |
| 342 | 363 { |
| 12080 | 364 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
| 342 | 365 _orig_end = mr.end(); |
| 366 // Note that initialize() will set the start of the unmarked area of the | |
| 367 // region. | |
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368 hr_clear(false /*par*/, false /*clear_space*/); |
| 356 | 369 set_top(bottom()); |
| 370 set_saved_mark(); | |
| 342 | 371 |
| 372 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
| 373 } | |
| 374 | |
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375 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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376 // We're not using an iterator given that it will wrap around when |
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377 // it reaches the last region and this is not what we want here. |
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378 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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379 uint index = hrs_index() + 1; |
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380 while (index < g1h->n_regions()) { |
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381 HeapRegion* hr = g1h->region_at(index); |
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382 if (!hr->isHumongous()) { |
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383 return hr; |
| 342 | 384 } |
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385 index += 1; |
| 342 | 386 } |
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387 return NULL; |
| 342 | 388 } |
| 389 | |
| 390 void HeapRegion::save_marks() { | |
| 391 set_saved_mark(); | |
| 392 } | |
| 393 | |
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394 void HeapRegion::oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
| 342 | 395 HeapWord* p = mr.start(); |
| 396 HeapWord* e = mr.end(); | |
| 397 oop obj; | |
| 398 while (p < e) { | |
| 399 obj = oop(p); | |
| 400 p += obj->oop_iterate(cl); | |
| 401 } | |
| 402 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
| 403 } | |
| 404 | |
| 405 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 406 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
| 407 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 408 } | |
| 409 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 410 | |
| 411 | |
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412 void HeapRegion::oop_before_save_marks_iterate(ExtendedOopClosure* cl) { |
| 342 | 413 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); |
| 414 } | |
| 415 | |
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416 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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417 bool during_conc_mark) { |
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418 // We always recreate the prev marking info and we'll explicitly |
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419 // mark all objects we find to be self-forwarded on the prev |
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420 // bitmap. So all objects need to be below PTAMS. |
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421 _prev_top_at_mark_start = top(); |
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422 _prev_marked_bytes = 0; |
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423 |
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424 if (during_initial_mark) { |
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425 // During initial-mark, we'll also explicitly mark all objects |
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426 // we find to be self-forwarded on the next bitmap. So all |
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427 // objects need to be below NTAMS. |
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428 _next_top_at_mark_start = top(); |
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429 _next_marked_bytes = 0; |
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430 } else if (during_conc_mark) { |
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431 // During concurrent mark, all objects in the CSet (including |
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432 // the ones we find to be self-forwarded) are implicitly live. |
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433 // So all objects need to be above NTAMS. |
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434 _next_top_at_mark_start = bottom(); |
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435 _next_marked_bytes = 0; |
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436 } |
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437 } |
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438 |
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439 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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440 bool during_conc_mark, |
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441 size_t marked_bytes) { |
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442 assert(0 <= marked_bytes && marked_bytes <= used(), |
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443 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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444 marked_bytes, used())); |
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445 _prev_marked_bytes = marked_bytes; |
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446 } |
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447 |
| 342 | 448 HeapWord* |
| 449 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 450 ObjectClosure* cl) { | |
| 451 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 452 // We used to use "block_start_careful" here. But we're actually happy | |
| 453 // to update the BOT while we do this... | |
| 454 HeapWord* cur = block_start(mr.start()); | |
| 455 mr = mr.intersection(used_region()); | |
| 456 if (mr.is_empty()) return NULL; | |
| 457 // Otherwise, find the obj that extends onto mr.start(). | |
| 458 | |
| 459 assert(cur <= mr.start() | |
|
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460 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 461 cur + oop(cur)->size() > mr.start()), |
| 462 "postcondition of block_start"); | |
| 463 oop obj; | |
| 464 while (cur < mr.end()) { | |
| 465 obj = oop(cur); | |
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466 if (obj->klass_or_null() == NULL) { |
| 342 | 467 // Ran into an unparseable point. |
| 468 return cur; | |
| 469 } else if (!g1h->is_obj_dead(obj)) { | |
| 470 cl->do_object(obj); | |
| 471 } | |
| 472 if (cl->abort()) return cur; | |
| 473 // The check above must occur before the operation below, since an | |
| 474 // abort might invalidate the "size" operation. | |
| 475 cur += obj->size(); | |
| 476 } | |
| 477 return NULL; | |
| 478 } | |
| 479 | |
| 480 HeapWord* | |
| 481 HeapRegion:: | |
| 482 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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483 FilterOutOfRegionClosure* cl, |
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484 bool filter_young, |
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485 jbyte* card_ptr) { |
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486 // Currently, we should only have to clean the card if filter_young |
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487 // is true and vice versa. |
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488 if (filter_young) { |
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489 assert(card_ptr != NULL, "pre-condition"); |
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490 } else { |
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491 assert(card_ptr == NULL, "pre-condition"); |
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492 } |
| 342 | 493 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 494 | |
| 495 // If we're within a stop-world GC, then we might look at a card in a | |
| 496 // GC alloc region that extends onto a GC LAB, which may not be | |
| 497 // parseable. Stop such at the "saved_mark" of the region. | |
| 4839 | 498 if (g1h->is_gc_active()) { |
| 342 | 499 mr = mr.intersection(used_region_at_save_marks()); |
| 500 } else { | |
| 501 mr = mr.intersection(used_region()); | |
| 502 } | |
| 503 if (mr.is_empty()) return NULL; | |
| 504 // Otherwise, find the obj that extends onto mr.start(). | |
| 505 | |
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506 // The intersection of the incoming mr (for the card) and the |
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507 // allocated part of the region is non-empty. This implies that |
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508 // we have actually allocated into this region. The code in |
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509 // G1CollectedHeap.cpp that allocates a new region sets the |
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510 // is_young tag on the region before allocating. Thus we |
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511 // safely know if this region is young. |
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512 if (is_young() && filter_young) { |
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513 return NULL; |
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514 } |
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515 |
| 1705 | 516 assert(!is_young(), "check value of filter_young"); |
| 517 | |
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518 // We can only clean the card here, after we make the decision that |
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519 // the card is not young. And we only clean the card if we have been |
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520 // asked to (i.e., card_ptr != NULL). |
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521 if (card_ptr != NULL) { |
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522 *card_ptr = CardTableModRefBS::clean_card_val(); |
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523 // We must complete this write before we do any of the reads below. |
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524 OrderAccess::storeload(); |
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525 } |
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526 |
| 4839 | 527 // Cache the boundaries of the memory region in some const locals |
| 528 HeapWord* const start = mr.start(); | |
| 529 HeapWord* const end = mr.end(); | |
| 530 | |
| 342 | 531 // We used to use "block_start_careful" here. But we're actually happy |
| 532 // to update the BOT while we do this... | |
| 4839 | 533 HeapWord* cur = block_start(start); |
| 534 assert(cur <= start, "Postcondition"); | |
| 535 | |
| 536 oop obj; | |
| 342 | 537 |
| 4839 | 538 HeapWord* next = cur; |
| 539 while (next <= start) { | |
| 540 cur = next; | |
| 541 obj = oop(cur); | |
| 542 if (obj->klass_or_null() == NULL) { | |
| 342 | 543 // Ran into an unparseable point. |
| 544 return cur; | |
| 545 } | |
| 546 // Otherwise... | |
| 4839 | 547 next = (cur + obj->size()); |
| 342 | 548 } |
| 4839 | 549 |
| 550 // If we finish the above loop...We have a parseable object that | |
| 551 // begins on or before the start of the memory region, and ends | |
| 552 // inside or spans the entire region. | |
| 553 | |
| 554 assert(obj == oop(cur), "sanity"); | |
| 555 assert(cur <= start && | |
| 556 obj->klass_or_null() != NULL && | |
| 557 (cur + obj->size()) > start, | |
| 342 | 558 "Loop postcondition"); |
| 4839 | 559 |
| 342 | 560 if (!g1h->is_obj_dead(obj)) { |
| 561 obj->oop_iterate(cl, mr); | |
| 562 } | |
| 563 | |
| 4839 | 564 while (cur < end) { |
| 342 | 565 obj = oop(cur); |
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566 if (obj->klass_or_null() == NULL) { |
| 342 | 567 // Ran into an unparseable point. |
| 568 return cur; | |
| 569 }; | |
| 4839 | 570 |
| 342 | 571 // Otherwise: |
| 572 next = (cur + obj->size()); | |
| 4839 | 573 |
| 342 | 574 if (!g1h->is_obj_dead(obj)) { |
| 4839 | 575 if (next < end || !obj->is_objArray()) { |
| 576 // This object either does not span the MemRegion | |
| 577 // boundary, or if it does it's not an array. | |
| 578 // Apply closure to whole object. | |
| 342 | 579 obj->oop_iterate(cl); |
| 580 } else { | |
| 4839 | 581 // This obj is an array that spans the boundary. |
| 582 // Stop at the boundary. | |
| 583 obj->oop_iterate(cl, mr); | |
| 342 | 584 } |
| 585 } | |
| 586 cur = next; | |
| 587 } | |
| 588 return NULL; | |
| 589 } | |
| 590 | |
| 12080 | 591 // Code roots support |
| 592 | |
| 593 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
| 594 HeapRegionRemSet* hrrs = rem_set(); | |
| 595 hrrs->add_strong_code_root(nm); | |
| 596 } | |
| 597 | |
| 598 void HeapRegion::remove_strong_code_root(nmethod* nm) { | |
| 599 HeapRegionRemSet* hrrs = rem_set(); | |
| 600 hrrs->remove_strong_code_root(nm); | |
| 601 } | |
| 602 | |
| 603 void HeapRegion::migrate_strong_code_roots() { | |
| 604 assert(in_collection_set(), "only collection set regions"); | |
| 605 assert(!isHumongous(), "not humongous regions"); | |
| 606 | |
| 607 HeapRegionRemSet* hrrs = rem_set(); | |
| 608 hrrs->migrate_strong_code_roots(); | |
| 609 } | |
| 610 | |
| 611 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
| 612 HeapRegionRemSet* hrrs = rem_set(); | |
| 613 hrrs->strong_code_roots_do(blk); | |
| 614 } | |
| 615 | |
| 616 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
| 617 const HeapRegion* _hr; | |
| 618 nmethod* _nm; | |
| 619 bool _failures; | |
| 620 bool _has_oops_in_region; | |
| 621 | |
| 622 template <class T> void do_oop_work(T* p) { | |
| 623 T heap_oop = oopDesc::load_heap_oop(p); | |
| 624 if (!oopDesc::is_null(heap_oop)) { | |
| 625 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 626 | |
| 627 // Note: not all the oops embedded in the nmethod are in the | |
| 628 // current region. We only look at those which are. | |
| 629 if (_hr->is_in(obj)) { | |
| 630 // Object is in the region. Check that its less than top | |
| 631 if (_hr->top() <= (HeapWord*)obj) { | |
| 632 // Object is above top | |
| 633 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
| 634 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
| 635 "top "PTR_FORMAT, | |
| 636 obj, _hr->bottom(), _hr->end(), _hr->top()); | |
| 637 _failures = true; | |
| 638 return; | |
| 639 } | |
| 640 // Nmethod has at least one oop in the current region | |
| 641 _has_oops_in_region = true; | |
| 642 } | |
| 643 } | |
| 644 } | |
| 645 | |
| 646 public: | |
| 647 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
| 648 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
| 649 | |
| 650 void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 651 void do_oop(oop* p) { do_oop_work(p); } | |
| 652 | |
| 653 bool failures() { return _failures; } | |
| 654 bool has_oops_in_region() { return _has_oops_in_region; } | |
| 655 }; | |
| 656 | |
| 657 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
| 658 const HeapRegion* _hr; | |
| 659 bool _failures; | |
| 660 public: | |
| 661 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
| 662 _hr(hr), _failures(false) {} | |
| 663 | |
| 664 void do_code_blob(CodeBlob* cb) { | |
| 665 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
| 666 if (nm != NULL) { | |
| 667 // Verify that the nemthod is live | |
| 668 if (!nm->is_alive()) { | |
| 669 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
| 670 PTR_FORMAT" in its strong code roots", | |
| 671 _hr->bottom(), _hr->end(), nm); | |
| 672 _failures = true; | |
| 673 } else { | |
| 674 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
| 675 nm->oops_do(&oop_cl); | |
| 676 if (!oop_cl.has_oops_in_region()) { | |
| 677 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
| 678 PTR_FORMAT" in its strong code roots " | |
| 679 "with no pointers into region", | |
| 680 _hr->bottom(), _hr->end(), nm); | |
| 681 _failures = true; | |
| 682 } else if (oop_cl.failures()) { | |
| 683 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
| 684 "failures for nmethod "PTR_FORMAT, | |
| 685 _hr->bottom(), _hr->end(), nm); | |
| 686 _failures = true; | |
| 687 } | |
| 688 } | |
| 689 } | |
| 690 } | |
| 691 | |
| 692 bool failures() { return _failures; } | |
| 693 }; | |
| 694 | |
| 695 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
| 696 if (!G1VerifyHeapRegionCodeRoots) { | |
| 697 // We're not verifying code roots. | |
| 698 return; | |
| 699 } | |
| 700 if (vo == VerifyOption_G1UseMarkWord) { | |
| 701 // Marking verification during a full GC is performed after class | |
| 702 // unloading, code cache unloading, etc so the strong code roots | |
| 703 // attached to each heap region are in an inconsistent state. They won't | |
| 704 // be consistent until the strong code roots are rebuilt after the | |
| 705 // actual GC. Skip verifying the strong code roots in this particular | |
| 706 // time. | |
| 707 assert(VerifyDuringGC, "only way to get here"); | |
| 708 return; | |
| 709 } | |
| 710 | |
| 711 HeapRegionRemSet* hrrs = rem_set(); | |
| 712 int strong_code_roots_length = hrrs->strong_code_roots_list_length(); | |
| 713 | |
| 714 // if this region is empty then there should be no entries | |
| 715 // on its strong code root list | |
| 716 if (is_empty()) { | |
| 717 if (strong_code_roots_length > 0) { | |
| 718 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
| 719 "but has "INT32_FORMAT" code root entries", | |
| 720 bottom(), end(), strong_code_roots_length); | |
| 721 *failures = true; | |
| 722 } | |
| 723 return; | |
| 724 } | |
| 725 | |
| 726 // An H-region should have an empty strong code root list | |
| 727 if (isHumongous()) { | |
| 728 if (strong_code_roots_length > 0) { | |
| 729 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " | |
| 730 "but has "INT32_FORMAT" code root entries", | |
| 731 bottom(), end(), strong_code_roots_length); | |
| 732 *failures = true; | |
| 733 } | |
| 734 return; | |
| 735 } | |
| 736 | |
| 737 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
| 738 strong_code_roots_do(&cb_cl); | |
| 739 | |
| 740 if (cb_cl.failures()) { | |
| 741 *failures = true; | |
| 742 } | |
| 743 } | |
| 744 | |
| 342 | 745 void HeapRegion::print() const { print_on(gclog_or_tty); } |
| 746 void HeapRegion::print_on(outputStream* st) const { | |
| 747 if (isHumongous()) { | |
| 748 if (startsHumongous()) | |
| 749 st->print(" HS"); | |
| 750 else | |
| 751 st->print(" HC"); | |
| 752 } else { | |
| 753 st->print(" "); | |
| 754 } | |
| 755 if (in_collection_set()) | |
| 756 st->print(" CS"); | |
| 757 else | |
| 758 st->print(" "); | |
| 759 if (is_young()) | |
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760 st->print(is_survivor() ? " SU" : " Y "); |
| 342 | 761 else |
| 762 st->print(" "); | |
| 763 if (is_empty()) | |
| 764 st->print(" F"); | |
| 765 else | |
| 766 st->print(" "); | |
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767 st->print(" TS %5d", _gc_time_stamp); |
| 1388 | 768 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 769 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 770 G1OffsetTableContigSpace::print_on(st); |
| 771 } | |
| 772 | |
| 12080 | 773 class VerifyLiveClosure: public OopClosure { |
| 774 private: | |
| 775 G1CollectedHeap* _g1h; | |
| 776 CardTableModRefBS* _bs; | |
| 777 oop _containing_obj; | |
| 778 bool _failures; | |
| 779 int _n_failures; | |
| 780 VerifyOption _vo; | |
| 781 public: | |
| 782 // _vo == UsePrevMarking -> use "prev" marking information, | |
| 783 // _vo == UseNextMarking -> use "next" marking information, | |
| 784 // _vo == UseMarkWord -> use mark word from object header. | |
| 785 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
| 786 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
| 787 _failures(false), _n_failures(0), _vo(vo) | |
| 788 { | |
| 789 BarrierSet* bs = _g1h->barrier_set(); | |
| 790 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 791 _bs = (CardTableModRefBS*)bs; | |
| 792 } | |
| 793 | |
| 794 void set_containing_obj(oop obj) { | |
| 795 _containing_obj = obj; | |
| 796 } | |
| 797 | |
| 798 bool failures() { return _failures; } | |
| 799 int n_failures() { return _n_failures; } | |
| 800 | |
| 801 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 802 virtual void do_oop( oop* p) { do_oop_work(p); } | |
| 803 | |
| 804 void print_object(outputStream* out, oop obj) { | |
| 805 #ifdef PRODUCT | |
| 806 Klass* k = obj->klass(); | |
| 807 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
| 808 out->print_cr("class name %s", class_name); | |
| 809 #else // PRODUCT | |
| 810 obj->print_on(out); | |
| 811 #endif // PRODUCT | |
| 812 } | |
| 813 | |
| 814 template <class T> | |
| 815 void do_oop_work(T* p) { | |
| 816 assert(_containing_obj != NULL, "Precondition"); | |
| 817 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
| 818 "Precondition"); | |
| 819 T heap_oop = oopDesc::load_heap_oop(p); | |
| 820 if (!oopDesc::is_null(heap_oop)) { | |
| 821 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 822 bool failed = false; | |
| 823 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
| 824 MutexLockerEx x(ParGCRareEvent_lock, | |
| 825 Mutex::_no_safepoint_check_flag); | |
| 826 | |
| 827 if (!_failures) { | |
| 828 gclog_or_tty->print_cr(""); | |
| 829 gclog_or_tty->print_cr("----------"); | |
| 830 } | |
| 831 if (!_g1h->is_in_closed_subset(obj)) { | |
| 832 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 833 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 834 " of live obj "PTR_FORMAT" in region " | |
| 835 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 836 p, (void*) _containing_obj, | |
| 837 from->bottom(), from->end()); | |
| 838 print_object(gclog_or_tty, _containing_obj); | |
| 839 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 840 (void*) obj); | |
| 841 } else { | |
| 842 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 843 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 844 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 845 " of live obj "PTR_FORMAT" in region " | |
| 846 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 847 p, (void*) _containing_obj, | |
| 848 from->bottom(), from->end()); | |
| 849 print_object(gclog_or_tty, _containing_obj); | |
| 850 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 851 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 852 (void*) obj, to->bottom(), to->end()); | |
| 853 print_object(gclog_or_tty, obj); | |
| 854 } | |
| 855 gclog_or_tty->print_cr("----------"); | |
| 856 gclog_or_tty->flush(); | |
| 857 _failures = true; | |
| 858 failed = true; | |
| 859 _n_failures++; | |
| 860 } | |
| 861 | |
| 862 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
| 863 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 864 HeapRegion* to = _g1h->heap_region_containing(obj); | |
| 865 if (from != NULL && to != NULL && | |
| 866 from != to && | |
| 867 !to->isHumongous()) { | |
| 868 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 869 jbyte cv_field = *_bs->byte_for_const(p); | |
| 870 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 871 | |
| 872 bool is_bad = !(from->is_young() | |
| 873 || to->rem_set()->contains_reference(p) | |
| 874 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 875 (_containing_obj->is_objArray() ? | |
| 876 cv_field == dirty | |
| 877 : cv_obj == dirty || cv_field == dirty)); | |
| 878 if (is_bad) { | |
| 879 MutexLockerEx x(ParGCRareEvent_lock, | |
| 880 Mutex::_no_safepoint_check_flag); | |
| 881 | |
| 882 if (!_failures) { | |
| 883 gclog_or_tty->print_cr(""); | |
| 884 gclog_or_tty->print_cr("----------"); | |
| 885 } | |
| 886 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 887 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
| 888 "of obj "PTR_FORMAT", " | |
| 889 "in region "HR_FORMAT, | |
| 890 p, (void*) _containing_obj, | |
| 891 HR_FORMAT_PARAMS(from)); | |
| 892 _containing_obj->print_on(gclog_or_tty); | |
| 893 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
| 894 "in region "HR_FORMAT, | |
| 895 (void*) obj, | |
| 896 HR_FORMAT_PARAMS(to)); | |
| 897 obj->print_on(gclog_or_tty); | |
| 898 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 899 cv_obj, cv_field); | |
| 900 gclog_or_tty->print_cr("----------"); | |
| 901 gclog_or_tty->flush(); | |
| 902 _failures = true; | |
| 903 if (!failed) _n_failures++; | |
| 904 } | |
| 905 } | |
| 906 } | |
| 907 } | |
| 908 } | |
| 909 }; | |
| 811 | 910 |
| 342 | 911 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
| 912 // We would need a mechanism to make that code skip dead objects. | |
| 913 | |
| 6008 | 914 void HeapRegion::verify(VerifyOption vo, |
|
1020
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942
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|
915 bool* failures) const { |
| 342 | 916 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
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|
917 *failures = false; |
| 342 | 918 HeapWord* p = bottom(); |
| 919 HeapWord* prev_p = NULL; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
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|
920 VerifyLiveClosure vl_cl(g1, vo); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
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diff
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|
921 bool is_humongous = isHumongous(); |
|
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diff
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|
922 bool do_bot_verify = !is_young(); |
|
1718
bb847e31b836
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diff
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|
923 size_t object_num = 0; |
| 342 | 924 while (p < top()) { |
|
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|
925 oop obj = oop(p); |
|
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|
926 size_t obj_size = obj->size(); |
|
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diff
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|
927 object_num += 1; |
|
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|
928 |
|
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diff
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|
929 if (is_humongous != g1->isHumongous(obj_size)) { |
|
1718
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diff
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|
930 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
|
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tonyp
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diff
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|
931 SIZE_FORMAT" words) in a %shumongous region", |
|
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diff
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|
932 p, g1->isHumongous(obj_size) ? "" : "non-", |
|
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diff
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|
933 obj_size, is_humongous ? "" : "non-"); |
|
1718
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1705
diff
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|
934 *failures = true; |
|
2133
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1972
diff
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|
935 return; |
|
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1972
diff
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|
936 } |
|
2250ee17e258
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diff
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|
937 |
|
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|
938 // If it returns false, verify_for_object() will output the |
|
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diff
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|
939 // appropriate messasge. |
|
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|
940 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
|
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1972
diff
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|
941 *failures = true; |
|
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1972
diff
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|
942 return; |
|
1718
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diff
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|
943 } |
|
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|
944 |
|
3772
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|
945 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
|
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|
946 if (obj->is_oop()) { |
|
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
947 Klass* klass = obj->klass(); |
| 11034 | 948 if (!klass->is_metaspace_object()) { |
|
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|
949 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
6725
da91efe96a93
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diff
changeset
|
950 "not metadata", klass, obj); |
|
2133
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diff
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|
951 *failures = true; |
|
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diff
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|
952 return; |
|
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|
953 } else if (!klass->is_klass()) { |
|
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diff
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|
954 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
2250ee17e258
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1972
diff
changeset
|
955 "not a klass", klass, obj); |
|
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1972
diff
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|
956 *failures = true; |
|
2250ee17e258
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1972
diff
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|
957 return; |
|
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1972
diff
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|
958 } else { |
|
2250ee17e258
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1972
diff
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|
959 vl_cl.set_containing_obj(obj); |
|
6725
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6611
diff
changeset
|
960 obj->oop_iterate_no_header(&vl_cl); |
|
2133
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1972
diff
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|
961 if (vl_cl.failures()) { |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
962 *failures = true; |
|
2250ee17e258
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1972
diff
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|
963 } |
|
2250ee17e258
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1972
diff
changeset
|
964 if (G1MaxVerifyFailures >= 0 && |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
965 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
966 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
967 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
changeset
|
968 } |
|
2250ee17e258
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1972
diff
changeset
|
969 } else { |
|
2250ee17e258
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1972
diff
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|
970 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
971 *failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
972 return; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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942
diff
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|
973 } |
| 342 | 974 } |
| 975 prev_p = p; | |
|
2133
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1972
diff
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|
976 p += obj_size; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
977 } |
|
2250ee17e258
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1972
diff
changeset
|
978 |
|
2250ee17e258
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1972
diff
changeset
|
979 if (p != top()) { |
|
2250ee17e258
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1972
diff
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|
980 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
|
2250ee17e258
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1972
diff
changeset
|
981 "does not match top "PTR_FORMAT, p, top()); |
|
2250ee17e258
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tonyp
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1972
diff
changeset
|
982 *failures = true; |
|
2250ee17e258
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parents:
1972
diff
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|
983 return; |
| 342 | 984 } |
|
2133
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1972
diff
changeset
|
985 |
|
2250ee17e258
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parents:
1972
diff
changeset
|
986 HeapWord* the_end = end(); |
|
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1972
diff
changeset
|
987 assert(p == top(), "it should still hold"); |
|
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1972
diff
changeset
|
988 // Do some extra BOT consistency checking for addresses in the |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
989 // range [top, end). BOT look-ups in this range should yield |
|
2250ee17e258
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tonyp
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1972
diff
changeset
|
990 // top. No point in doing that if top == end (there's nothing there). |
|
2250ee17e258
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parents:
1972
diff
changeset
|
991 if (p < the_end) { |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
992 // Look up top |
|
2250ee17e258
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1972
diff
changeset
|
993 HeapWord* addr_1 = p; |
|
2250ee17e258
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1972
diff
changeset
|
994 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
|
2250ee17e258
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tonyp
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1972
diff
changeset
|
995 if (b_start_1 != p) { |
|
2250ee17e258
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tonyp
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1972
diff
changeset
|
996 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
|
2250ee17e258
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1972
diff
changeset
|
997 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
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1972
diff
changeset
|
998 addr_1, b_start_1, p); |
|
2250ee17e258
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parents:
1972
diff
changeset
|
999 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
1000 return; |
|
2250ee17e258
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parents:
1972
diff
changeset
|
1001 } |
|
2250ee17e258
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1972
diff
changeset
|
1002 |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1003 // Look up top + 1 |
|
2250ee17e258
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1972
diff
changeset
|
1004 HeapWord* addr_2 = p + 1; |
|
2250ee17e258
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diff
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|
1005 if (addr_2 < the_end) { |
|
2250ee17e258
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parents:
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diff
changeset
|
1006 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
|
2250ee17e258
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1972
diff
changeset
|
1007 if (b_start_2 != p) { |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1008 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
|
2250ee17e258
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tonyp
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1972
diff
changeset
|
1009 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
1010 addr_2, b_start_2, p); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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942
diff
changeset
|
1011 *failures = true; |
|
ff2402f6a50b
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parents:
942
diff
changeset
|
1012 return; |
|
2133
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parents:
1972
diff
changeset
|
1013 } |
|
2250ee17e258
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1972
diff
changeset
|
1014 } |
|
2250ee17e258
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1015 |
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1016 // Look up an address between top and end |
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1017 size_t diff = pointer_delta(the_end, p) / 2; |
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1018 HeapWord* addr_3 = p + diff; |
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1019 if (addr_3 < the_end) { |
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1020 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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1021 if (b_start_3 != p) { |
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1022 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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1023 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1024 addr_3, b_start_3, p); |
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1025 *failures = true; |
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1026 return; |
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1027 } |
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1028 } |
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1029 |
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1030 // Loook up end - 1 |
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1031 HeapWord* addr_4 = the_end - 1; |
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1032 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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1033 if (b_start_4 != p) { |
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1034 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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1035 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1036 addr_4, b_start_4, p); |
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1037 *failures = true; |
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1038 return; |
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1039 } |
| 342 | 1040 } |
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1041 |
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1042 if (is_humongous && object_num > 1) { |
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1043 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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1044 "but has "SIZE_FORMAT", objects", |
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1045 bottom(), end(), object_num); |
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1046 *failures = true; |
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1047 return; |
| 342 | 1048 } |
| 12080 | 1049 |
| 1050 verify_strong_code_roots(vo, failures); | |
| 1051 } | |
| 1052 | |
| 1053 void HeapRegion::verify() const { | |
| 1054 bool dummy = false; | |
| 1055 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); | |
| 342 | 1056 } |
| 1057 | |
| 1058 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
| 1059 // away eventually. | |
| 1060 | |
| 356 | 1061 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
| 1062 ContiguousSpace::clear(mangle_space); | |
| 342 | 1063 _offsets.zero_bottom_entry(); |
| 1064 _offsets.initialize_threshold(); | |
| 1065 } | |
| 1066 | |
| 1067 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 1068 Space::set_bottom(new_bottom); | |
| 1069 _offsets.set_bottom(new_bottom); | |
| 1070 } | |
| 1071 | |
| 1072 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 1073 Space::set_end(new_end); | |
| 1074 _offsets.resize(new_end - bottom()); | |
| 1075 } | |
| 1076 | |
| 1077 void G1OffsetTableContigSpace::print() const { | |
| 1078 print_short(); | |
| 1079 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 1080 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 1081 bottom(), top(), _offsets.threshold(), end()); | |
| 1082 } | |
| 1083 | |
| 1084 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 1085 return _offsets.initialize_threshold(); | |
| 1086 } | |
| 1087 | |
| 1088 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 1089 HeapWord* end) { | |
| 1090 _offsets.alloc_block(start, end); | |
| 1091 return _offsets.threshold(); | |
| 1092 } | |
| 1093 | |
| 1094 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 1095 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1096 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
| 1097 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
| 1098 return top(); | |
| 1099 else | |
| 1100 return ContiguousSpace::saved_mark_word(); | |
| 1101 } | |
| 1102 | |
| 1103 void G1OffsetTableContigSpace::set_saved_mark() { | |
| 1104 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1105 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 1106 | |
| 1107 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 1108 // The order of these is important, as another thread might be | |
| 1109 // about to start scanning this region. If it does so after | |
| 1110 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 1111 // will be false, and it will pick up top() as the high water mark | |
| 1112 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 1113 // will pick up the right saved_mark_word() as the high water mark | |
| 1114 // of the region. Either way, the behaviour will be correct. | |
| 1115 ContiguousSpace::set_saved_mark(); | |
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1116 OrderAccess::storestore(); |
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1117 _gc_time_stamp = curr_gc_time_stamp; |
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1118 // No need to do another barrier to flush the writes above. If |
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1119 // this is called in parallel with other threads trying to |
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1120 // allocate into the region, the caller should call this while |
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1121 // holding a lock and when the lock is released the writes will be |
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1122 // flushed. |
| 342 | 1123 } |
| 1124 } | |
| 1125 | |
| 1126 G1OffsetTableContigSpace:: | |
| 1127 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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1128 MemRegion mr) : |
| 342 | 1129 _offsets(sharedOffsetArray, mr), |
| 1130 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 1131 _gc_time_stamp(0) | |
| 1132 { | |
| 1133 _offsets.set_space(this); | |
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1134 // false ==> we'll do the clearing if there's clearing to be done. |
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1135 ContiguousSpace::initialize(mr, false, SpaceDecorator::Mangle); |
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1136 _offsets.zero_bottom_entry(); |
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1137 _offsets.initialize_threshold(); |
| 342 | 1138 } |