Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 20211:82693fb204a5
8038930: G1CodeRootSet::test fails with assert(_num_chunks_handed_out == 0) failed: No elements must have been handed out yet
Summary: The test incorrectly assumed that it had been started with no other previous compilation activity. Fix this by allowing multiple code root free chunk lists, and use one separate from the global one to perform the test.
Reviewed-by: brutisso
| author | tschatzl |
|---|---|
| date | Wed, 16 Apr 2014 10:14:50 +0200 |
| parents | c49dcaf78a65 |
| children | e635a728f9da |
| 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) : | |
| 51 ContiguousSpaceDCTOC(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 | |
| 80 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
| 81 HeapWord* bottom, | |
| 82 HeapWord* top, | |
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83 ExtendedOopClosure* cl) { |
| 342 | 84 G1CollectedHeap* g1h = _g1; |
| 85 int oop_size; | |
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86 ExtendedOopClosure* cl2 = NULL; |
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87 |
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88 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
| 342 | 89 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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90 |
| 342 | 91 switch (_fk) { |
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92 case NoFilterKind: cl2 = cl; break; |
| 342 | 93 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
| 94 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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95 default: ShouldNotReachHere(); |
| 342 | 96 } |
| 97 | |
| 98 // Start filtering what we add to the remembered set. If the object is | |
| 99 // not considered dead, either because it is marked (in the mark bitmap) | |
| 100 // or it was allocated after marking finished, then we add it. Otherwise | |
| 101 // we can safely ignore the object. | |
| 102 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 103 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 104 } else { | |
| 105 oop_size = oop(bottom)->size(); | |
| 106 } | |
| 107 | |
| 108 bottom += oop_size; | |
| 109 | |
| 110 if (bottom < top) { | |
| 111 // We replicate the loop below for several kinds of possible filters. | |
| 112 switch (_fk) { | |
| 113 case NoFilterKind: | |
| 114 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
| 115 break; | |
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116 |
| 342 | 117 case IntoCSFilterKind: { |
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118 FilterIntoCSClosure filt(this, g1h, cl); |
| 342 | 119 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
| 120 break; | |
| 121 } | |
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122 |
| 342 | 123 case OutOfRegionFilterKind: { |
| 124 FilterOutOfRegionClosure filt(_hr, cl); | |
| 125 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 126 break; | |
| 127 } | |
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128 |
| 342 | 129 default: |
| 130 ShouldNotReachHere(); | |
| 131 } | |
| 132 | |
| 133 // Last object. Need to do dead-obj filtering here too. | |
| 134 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 135 oop(bottom)->oop_iterate(cl2, mr); | |
| 136 } | |
| 137 } | |
| 138 } | |
| 139 | |
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140 // Minimum region size; we won't go lower than that. |
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141 // We might want to decrease this in the future, to deal with small |
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142 // heaps a bit more efficiently. |
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143 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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144 |
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145 // Maximum region size; we don't go higher than that. There's a good |
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146 // reason for having an upper bound. We don't want regions to get too |
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147 // large, otherwise cleanup's effectiveness would decrease as there |
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148 // will be fewer opportunities to find totally empty regions after |
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149 // marking. |
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150 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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151 |
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152 // The automatic region size calculation will try to have around this |
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153 // many regions in the heap (based on the min heap size). |
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154 #define TARGET_REGION_NUMBER 2048 |
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155 |
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156 size_t HeapRegion::max_region_size() { |
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157 return (size_t)MAX_REGION_SIZE; |
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158 } |
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159 |
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160 void HeapRegion::setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size) { |
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161 uintx region_size = G1HeapRegionSize; |
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162 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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163 size_t average_heap_size = (initial_heap_size + max_heap_size) / 2; |
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164 region_size = MAX2(average_heap_size / TARGET_REGION_NUMBER, |
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165 (uintx) MIN_REGION_SIZE); |
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166 } |
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167 |
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168 int region_size_log = log2_long((jlong) region_size); |
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169 // Recalculate the region size to make sure it's a power of |
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170 // 2. This means that region_size is the largest power of 2 that's |
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171 // <= what we've calculated so far. |
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172 region_size = ((uintx)1 << region_size_log); |
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173 |
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174 // Now make sure that we don't go over or under our limits. |
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175 if (region_size < MIN_REGION_SIZE) { |
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176 region_size = MIN_REGION_SIZE; |
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177 } else if (region_size > MAX_REGION_SIZE) { |
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178 region_size = MAX_REGION_SIZE; |
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179 } |
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180 |
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181 // And recalculate the log. |
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182 region_size_log = log2_long((jlong) region_size); |
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183 |
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184 // Now, set up the globals. |
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185 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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186 LogOfHRGrainBytes = region_size_log; |
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187 |
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188 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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189 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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190 |
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191 guarantee(GrainBytes == 0, "we should only set it once"); |
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192 // The cast to int is safe, given that we've bounded region_size by |
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193 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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194 GrainBytes = (size_t)region_size; |
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195 |
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196 guarantee(GrainWords == 0, "we should only set it once"); |
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197 GrainWords = GrainBytes >> LogHeapWordSize; |
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198 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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199 |
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200 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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201 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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202 } |
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203 |
| 342 | 204 void HeapRegion::reset_after_compaction() { |
| 205 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 206 // After a compaction the mark bitmap is invalid, so we must | |
| 207 // treat all objects as being inside the unmarked area. | |
| 208 zero_marked_bytes(); | |
| 209 init_top_at_mark_start(); | |
| 210 } | |
| 211 | |
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212 void HeapRegion::hr_clear(bool par, bool clear_space, bool locked) { |
| 2152 | 213 assert(_humongous_type == NotHumongous, |
| 214 "we should have already filtered out humongous regions"); | |
| 215 assert(_humongous_start_region == NULL, | |
| 216 "we should have already filtered out humongous regions"); | |
| 217 assert(_end == _orig_end, | |
| 218 "we should have already filtered out humongous regions"); | |
| 219 | |
| 342 | 220 _in_collection_set = false; |
| 221 | |
| 222 set_young_index_in_cset(-1); | |
| 223 uninstall_surv_rate_group(); | |
| 224 set_young_type(NotYoung); | |
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225 reset_pre_dummy_top(); |
| 342 | 226 |
| 227 if (!par) { | |
| 228 // If this is parallel, this will be done later. | |
| 229 HeapRegionRemSet* hrrs = rem_set(); | |
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230 if (locked) { |
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231 hrrs->clear_locked(); |
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232 } else { |
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233 hrrs->clear(); |
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234 } |
| 355 | 235 _claimed = InitialClaimValue; |
| 342 | 236 } |
| 237 zero_marked_bytes(); | |
| 238 | |
| 239 _offsets.resize(HeapRegion::GrainWords); | |
| 240 init_top_at_mark_start(); | |
| 356 | 241 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 242 } |
| 243 | |
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244 void HeapRegion::par_clear() { |
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245 assert(used() == 0, "the region should have been already cleared"); |
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246 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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247 HeapRegionRemSet* hrrs = rem_set(); |
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248 hrrs->clear(); |
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249 CardTableModRefBS* ct_bs = |
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250 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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251 ct_bs->clear(MemRegion(bottom(), end())); |
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252 } |
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253 |
| 342 | 254 void HeapRegion::calc_gc_efficiency() { |
| 6611 | 255 // GC efficiency is the ratio of how much space would be |
| 256 // reclaimed over how long we predict it would take to reclaim it. | |
| 342 | 257 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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258 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 6611 | 259 |
| 260 // Retrieve a prediction of the elapsed time for this region for | |
| 261 // a mixed gc because the region will only be evacuated during a | |
| 262 // mixed gc. | |
| 263 double region_elapsed_time_ms = | |
| 264 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
| 265 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
| 342 | 266 } |
| 267 | |
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268 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
| 2152 | 269 assert(!isHumongous(), "sanity / pre-condition"); |
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270 assert(end() == _orig_end, |
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271 "Should be normal before the humongous object allocation"); |
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272 assert(top() == bottom(), "should be empty"); |
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273 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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274 |
| 355 | 275 _humongous_type = StartsHumongous; |
| 342 | 276 _humongous_start_region = this; |
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277 |
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278 set_end(new_end); |
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279 _offsets.set_for_starts_humongous(new_top); |
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280 } |
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281 |
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282 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
| 2152 | 283 assert(!isHumongous(), "sanity / pre-condition"); |
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284 assert(end() == _orig_end, |
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285 "Should be normal before the humongous object allocation"); |
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286 assert(top() == bottom(), "should be empty"); |
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287 assert(first_hr->startsHumongous(), "pre-condition"); |
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288 |
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289 _humongous_type = ContinuesHumongous; |
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290 _humongous_start_region = first_hr; |
| 342 | 291 } |
| 292 | |
| 2152 | 293 void HeapRegion::set_notHumongous() { |
| 294 assert(isHumongous(), "pre-condition"); | |
| 295 | |
| 296 if (startsHumongous()) { | |
| 297 assert(top() <= end(), "pre-condition"); | |
| 298 set_end(_orig_end); | |
| 299 if (top() > end()) { | |
| 300 // at least one "continues humongous" region after it | |
| 301 set_top(end()); | |
| 302 } | |
| 303 } else { | |
| 304 // continues humongous | |
| 305 assert(end() == _orig_end, "sanity"); | |
| 306 } | |
| 307 | |
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308 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
| 2152 | 309 _humongous_type = NotHumongous; |
| 310 _humongous_start_region = NULL; | |
| 311 } | |
| 312 | |
| 342 | 313 bool HeapRegion::claimHeapRegion(jint claimValue) { |
| 314 jint current = _claimed; | |
| 315 if (current != claimValue) { | |
| 316 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 317 if (res == current) { | |
| 318 return true; | |
| 319 } | |
| 320 } | |
| 321 return false; | |
| 322 } | |
| 323 | |
| 324 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
| 325 HeapWord* low = addr; | |
| 326 HeapWord* high = end(); | |
| 327 while (low < high) { | |
| 328 size_t diff = pointer_delta(high, low); | |
| 329 // Must add one below to bias toward the high amount. Otherwise, if | |
| 330 // "high" were at the desired value, and "low" were one less, we | |
| 331 // would not converge on "high". This is not symmetric, because | |
| 332 // we set "high" to a block start, which might be the right one, | |
| 333 // which we don't do for "low". | |
| 334 HeapWord* middle = low + (diff+1)/2; | |
| 335 if (middle == high) return high; | |
| 336 HeapWord* mid_bs = block_start_careful(middle); | |
| 337 if (mid_bs < addr) { | |
| 338 low = middle; | |
| 339 } else { | |
| 340 high = mid_bs; | |
| 341 } | |
| 342 } | |
| 343 assert(low == high && low >= addr, "Didn't work."); | |
| 344 return low; | |
| 345 } | |
| 346 | |
| 347 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 348 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 349 #endif // _MSC_VER | |
| 350 | |
| 351 | |
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352 HeapRegion::HeapRegion(uint hrs_index, |
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353 G1BlockOffsetSharedArray* sharedOffsetArray, |
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354 MemRegion mr) : |
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355 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
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356 _hrs_index(hrs_index), |
| 355 | 357 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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358 _in_collection_set(false), |
| 342 | 359 _next_in_special_set(NULL), _orig_end(NULL), |
| 355 | 360 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 6011 | 361 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
| 342 | 362 _young_type(NotYoung), _next_young_region(NULL), |
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363 _next_dirty_cards_region(NULL), _next(NULL), _prev(NULL), _pending_removal(false), |
| 2152 | 364 #ifdef ASSERT |
| 365 _containing_set(NULL), | |
| 366 #endif // ASSERT | |
| 367 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
| 368 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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369 _predicted_bytes_to_copy(0) |
| 342 | 370 { |
| 12080 | 371 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); |
| 342 | 372 _orig_end = mr.end(); |
| 373 // Note that initialize() will set the start of the unmarked area of the | |
| 374 // region. | |
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375 hr_clear(false /*par*/, false /*clear_space*/); |
| 356 | 376 set_top(bottom()); |
| 377 set_saved_mark(); | |
| 342 | 378 |
| 379 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
| 380 } | |
| 381 | |
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382 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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383 // We're not using an iterator given that it will wrap around when |
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384 // it reaches the last region and this is not what we want here. |
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385 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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386 uint index = hrs_index() + 1; |
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387 while (index < g1h->n_regions()) { |
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388 HeapRegion* hr = g1h->region_at(index); |
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389 if (!hr->isHumongous()) { |
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390 return hr; |
| 342 | 391 } |
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392 index += 1; |
| 342 | 393 } |
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394 return NULL; |
| 342 | 395 } |
| 396 | |
| 397 void HeapRegion::save_marks() { | |
| 398 set_saved_mark(); | |
| 399 } | |
| 400 | |
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401 void HeapRegion::oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
| 342 | 402 HeapWord* p = mr.start(); |
| 403 HeapWord* e = mr.end(); | |
| 404 oop obj; | |
| 405 while (p < e) { | |
| 406 obj = oop(p); | |
| 407 p += obj->oop_iterate(cl); | |
| 408 } | |
| 409 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
| 410 } | |
| 411 | |
| 412 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 413 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
| 414 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 415 } | |
| 416 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 417 | |
| 418 | |
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419 void HeapRegion::oop_before_save_marks_iterate(ExtendedOopClosure* cl) { |
| 342 | 420 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); |
| 421 } | |
| 422 | |
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423 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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424 bool during_conc_mark) { |
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425 // We always recreate the prev marking info and we'll explicitly |
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426 // mark all objects we find to be self-forwarded on the prev |
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427 // bitmap. So all objects need to be below PTAMS. |
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428 _prev_top_at_mark_start = top(); |
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429 _prev_marked_bytes = 0; |
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430 |
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431 if (during_initial_mark) { |
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432 // During initial-mark, we'll also explicitly mark all objects |
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433 // we find to be self-forwarded on the next bitmap. So all |
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434 // objects need to be below NTAMS. |
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435 _next_top_at_mark_start = top(); |
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436 _next_marked_bytes = 0; |
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437 } else if (during_conc_mark) { |
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438 // During concurrent mark, all objects in the CSet (including |
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439 // the ones we find to be self-forwarded) are implicitly live. |
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440 // So all objects need to be above NTAMS. |
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441 _next_top_at_mark_start = bottom(); |
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442 _next_marked_bytes = 0; |
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443 } |
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444 } |
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445 |
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446 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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447 bool during_conc_mark, |
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448 size_t marked_bytes) { |
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449 assert(0 <= marked_bytes && marked_bytes <= used(), |
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450 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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451 marked_bytes, used())); |
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452 _prev_marked_bytes = marked_bytes; |
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453 } |
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454 |
| 342 | 455 HeapWord* |
| 456 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 457 ObjectClosure* cl) { | |
| 458 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 459 // We used to use "block_start_careful" here. But we're actually happy | |
| 460 // to update the BOT while we do this... | |
| 461 HeapWord* cur = block_start(mr.start()); | |
| 462 mr = mr.intersection(used_region()); | |
| 463 if (mr.is_empty()) return NULL; | |
| 464 // Otherwise, find the obj that extends onto mr.start(). | |
| 465 | |
| 466 assert(cur <= mr.start() | |
|
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467 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 468 cur + oop(cur)->size() > mr.start()), |
| 469 "postcondition of block_start"); | |
| 470 oop obj; | |
| 471 while (cur < mr.end()) { | |
| 472 obj = oop(cur); | |
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473 if (obj->klass_or_null() == NULL) { |
| 342 | 474 // Ran into an unparseable point. |
| 475 return cur; | |
| 476 } else if (!g1h->is_obj_dead(obj)) { | |
| 477 cl->do_object(obj); | |
| 478 } | |
| 479 if (cl->abort()) return cur; | |
| 480 // The check above must occur before the operation below, since an | |
| 481 // abort might invalidate the "size" operation. | |
| 482 cur += obj->size(); | |
| 483 } | |
| 484 return NULL; | |
| 485 } | |
| 486 | |
| 487 HeapWord* | |
| 488 HeapRegion:: | |
| 489 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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490 FilterOutOfRegionClosure* cl, |
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491 bool filter_young, |
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492 jbyte* card_ptr) { |
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493 // Currently, we should only have to clean the card if filter_young |
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494 // is true and vice versa. |
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495 if (filter_young) { |
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496 assert(card_ptr != NULL, "pre-condition"); |
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497 } else { |
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498 assert(card_ptr == NULL, "pre-condition"); |
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499 } |
| 342 | 500 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 501 | |
| 502 // If we're within a stop-world GC, then we might look at a card in a | |
| 503 // GC alloc region that extends onto a GC LAB, which may not be | |
| 504 // parseable. Stop such at the "saved_mark" of the region. | |
| 4839 | 505 if (g1h->is_gc_active()) { |
| 342 | 506 mr = mr.intersection(used_region_at_save_marks()); |
| 507 } else { | |
| 508 mr = mr.intersection(used_region()); | |
| 509 } | |
| 510 if (mr.is_empty()) return NULL; | |
| 511 // Otherwise, find the obj that extends onto mr.start(). | |
| 512 | |
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513 // The intersection of the incoming mr (for the card) and the |
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514 // allocated part of the region is non-empty. This implies that |
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515 // we have actually allocated into this region. The code in |
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516 // G1CollectedHeap.cpp that allocates a new region sets the |
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517 // is_young tag on the region before allocating. Thus we |
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518 // safely know if this region is young. |
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519 if (is_young() && filter_young) { |
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520 return NULL; |
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521 } |
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522 |
| 1705 | 523 assert(!is_young(), "check value of filter_young"); |
| 524 | |
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525 // We can only clean the card here, after we make the decision that |
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526 // the card is not young. And we only clean the card if we have been |
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527 // asked to (i.e., card_ptr != NULL). |
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528 if (card_ptr != NULL) { |
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529 *card_ptr = CardTableModRefBS::clean_card_val(); |
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530 // We must complete this write before we do any of the reads below. |
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531 OrderAccess::storeload(); |
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532 } |
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533 |
| 4839 | 534 // Cache the boundaries of the memory region in some const locals |
| 535 HeapWord* const start = mr.start(); | |
| 536 HeapWord* const end = mr.end(); | |
| 537 | |
| 342 | 538 // We used to use "block_start_careful" here. But we're actually happy |
| 539 // to update the BOT while we do this... | |
| 4839 | 540 HeapWord* cur = block_start(start); |
| 541 assert(cur <= start, "Postcondition"); | |
| 542 | |
| 543 oop obj; | |
| 342 | 544 |
| 4839 | 545 HeapWord* next = cur; |
| 546 while (next <= start) { | |
| 547 cur = next; | |
| 548 obj = oop(cur); | |
| 549 if (obj->klass_or_null() == NULL) { | |
| 342 | 550 // Ran into an unparseable point. |
| 551 return cur; | |
| 552 } | |
| 553 // Otherwise... | |
| 4839 | 554 next = (cur + obj->size()); |
| 342 | 555 } |
| 4839 | 556 |
| 557 // If we finish the above loop...We have a parseable object that | |
| 558 // begins on or before the start of the memory region, and ends | |
| 559 // inside or spans the entire region. | |
| 560 | |
| 561 assert(obj == oop(cur), "sanity"); | |
| 562 assert(cur <= start && | |
| 563 obj->klass_or_null() != NULL && | |
| 564 (cur + obj->size()) > start, | |
| 342 | 565 "Loop postcondition"); |
| 4839 | 566 |
| 342 | 567 if (!g1h->is_obj_dead(obj)) { |
| 568 obj->oop_iterate(cl, mr); | |
| 569 } | |
| 570 | |
| 4839 | 571 while (cur < end) { |
| 342 | 572 obj = oop(cur); |
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573 if (obj->klass_or_null() == NULL) { |
| 342 | 574 // Ran into an unparseable point. |
| 575 return cur; | |
| 576 }; | |
| 4839 | 577 |
| 342 | 578 // Otherwise: |
| 579 next = (cur + obj->size()); | |
| 4839 | 580 |
| 342 | 581 if (!g1h->is_obj_dead(obj)) { |
| 4839 | 582 if (next < end || !obj->is_objArray()) { |
| 583 // This object either does not span the MemRegion | |
| 584 // boundary, or if it does it's not an array. | |
| 585 // Apply closure to whole object. | |
| 342 | 586 obj->oop_iterate(cl); |
| 587 } else { | |
| 4839 | 588 // This obj is an array that spans the boundary. |
| 589 // Stop at the boundary. | |
| 590 obj->oop_iterate(cl, mr); | |
| 342 | 591 } |
| 592 } | |
| 593 cur = next; | |
| 594 } | |
| 595 return NULL; | |
| 596 } | |
| 597 | |
| 12080 | 598 // Code roots support |
| 599 | |
| 600 void HeapRegion::add_strong_code_root(nmethod* nm) { | |
| 601 HeapRegionRemSet* hrrs = rem_set(); | |
| 602 hrrs->add_strong_code_root(nm); | |
| 603 } | |
| 604 | |
| 605 void HeapRegion::remove_strong_code_root(nmethod* nm) { | |
| 606 HeapRegionRemSet* hrrs = rem_set(); | |
| 607 hrrs->remove_strong_code_root(nm); | |
| 608 } | |
| 609 | |
| 610 void HeapRegion::migrate_strong_code_roots() { | |
| 611 assert(in_collection_set(), "only collection set regions"); | |
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612 assert(!isHumongous(), |
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613 err_msg("humongous region "HR_FORMAT" should not have been added to collection set", |
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614 HR_FORMAT_PARAMS(this))); |
| 12080 | 615 |
| 616 HeapRegionRemSet* hrrs = rem_set(); | |
| 617 hrrs->migrate_strong_code_roots(); | |
| 618 } | |
| 619 | |
| 620 void HeapRegion::strong_code_roots_do(CodeBlobClosure* blk) const { | |
| 621 HeapRegionRemSet* hrrs = rem_set(); | |
| 622 hrrs->strong_code_roots_do(blk); | |
| 623 } | |
| 624 | |
| 625 class VerifyStrongCodeRootOopClosure: public OopClosure { | |
| 626 const HeapRegion* _hr; | |
| 627 nmethod* _nm; | |
| 628 bool _failures; | |
| 629 bool _has_oops_in_region; | |
| 630 | |
| 631 template <class T> void do_oop_work(T* p) { | |
| 632 T heap_oop = oopDesc::load_heap_oop(p); | |
| 633 if (!oopDesc::is_null(heap_oop)) { | |
| 634 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 635 | |
| 636 // Note: not all the oops embedded in the nmethod are in the | |
| 637 // current region. We only look at those which are. | |
| 638 if (_hr->is_in(obj)) { | |
| 639 // Object is in the region. Check that its less than top | |
| 640 if (_hr->top() <= (HeapWord*)obj) { | |
| 641 // Object is above top | |
| 642 gclog_or_tty->print_cr("Object "PTR_FORMAT" in region " | |
| 643 "["PTR_FORMAT", "PTR_FORMAT") is above " | |
| 644 "top "PTR_FORMAT, | |
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645 (void *)obj, _hr->bottom(), _hr->end(), _hr->top()); |
| 12080 | 646 _failures = true; |
| 647 return; | |
| 648 } | |
| 649 // Nmethod has at least one oop in the current region | |
| 650 _has_oops_in_region = true; | |
| 651 } | |
| 652 } | |
| 653 } | |
| 654 | |
| 655 public: | |
| 656 VerifyStrongCodeRootOopClosure(const HeapRegion* hr, nmethod* nm): | |
| 657 _hr(hr), _failures(false), _has_oops_in_region(false) {} | |
| 658 | |
| 659 void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 660 void do_oop(oop* p) { do_oop_work(p); } | |
| 661 | |
| 662 bool failures() { return _failures; } | |
| 663 bool has_oops_in_region() { return _has_oops_in_region; } | |
| 664 }; | |
| 665 | |
| 666 class VerifyStrongCodeRootCodeBlobClosure: public CodeBlobClosure { | |
| 667 const HeapRegion* _hr; | |
| 668 bool _failures; | |
| 669 public: | |
| 670 VerifyStrongCodeRootCodeBlobClosure(const HeapRegion* hr) : | |
| 671 _hr(hr), _failures(false) {} | |
| 672 | |
| 673 void do_code_blob(CodeBlob* cb) { | |
| 674 nmethod* nm = (cb == NULL) ? NULL : cb->as_nmethod_or_null(); | |
| 675 if (nm != NULL) { | |
| 676 // Verify that the nemthod is live | |
| 677 if (!nm->is_alive()) { | |
| 678 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has dead nmethod " | |
| 679 PTR_FORMAT" in its strong code roots", | |
| 680 _hr->bottom(), _hr->end(), nm); | |
| 681 _failures = true; | |
| 682 } else { | |
| 683 VerifyStrongCodeRootOopClosure oop_cl(_hr, nm); | |
| 684 nm->oops_do(&oop_cl); | |
| 685 if (!oop_cl.has_oops_in_region()) { | |
| 686 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has nmethod " | |
| 687 PTR_FORMAT" in its strong code roots " | |
| 688 "with no pointers into region", | |
| 689 _hr->bottom(), _hr->end(), nm); | |
| 690 _failures = true; | |
| 691 } else if (oop_cl.failures()) { | |
| 692 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] has other " | |
| 693 "failures for nmethod "PTR_FORMAT, | |
| 694 _hr->bottom(), _hr->end(), nm); | |
| 695 _failures = true; | |
| 696 } | |
| 697 } | |
| 698 } | |
| 699 } | |
| 700 | |
| 701 bool failures() { return _failures; } | |
| 702 }; | |
| 703 | |
| 704 void HeapRegion::verify_strong_code_roots(VerifyOption vo, bool* failures) const { | |
| 705 if (!G1VerifyHeapRegionCodeRoots) { | |
| 706 // We're not verifying code roots. | |
| 707 return; | |
| 708 } | |
| 709 if (vo == VerifyOption_G1UseMarkWord) { | |
| 710 // Marking verification during a full GC is performed after class | |
| 711 // unloading, code cache unloading, etc so the strong code roots | |
| 712 // attached to each heap region are in an inconsistent state. They won't | |
| 713 // be consistent until the strong code roots are rebuilt after the | |
| 714 // actual GC. Skip verifying the strong code roots in this particular | |
| 715 // time. | |
| 716 assert(VerifyDuringGC, "only way to get here"); | |
| 717 return; | |
| 718 } | |
| 719 | |
| 720 HeapRegionRemSet* hrrs = rem_set(); | |
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721 size_t strong_code_roots_length = hrrs->strong_code_roots_list_length(); |
| 12080 | 722 |
| 723 // if this region is empty then there should be no entries | |
| 724 // on its strong code root list | |
| 725 if (is_empty()) { | |
| 726 if (strong_code_roots_length > 0) { | |
| 727 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is empty " | |
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728 "but has "SIZE_FORMAT" code root entries", |
| 12080 | 729 bottom(), end(), strong_code_roots_length); |
| 730 *failures = true; | |
| 731 } | |
| 732 return; | |
| 733 } | |
| 734 | |
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735 if (continuesHumongous()) { |
| 12080 | 736 if (strong_code_roots_length > 0) { |
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737 gclog_or_tty->print_cr("region "HR_FORMAT" is a continuation of a humongous " |
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738 "region but has "SIZE_FORMAT" code root entries", |
|
13062
28674af341ac
8027756: assert(!hr->isHumongous()) failed: code root in humongous region?
tschatzl
parents:
13060
diff
changeset
|
739 HR_FORMAT_PARAMS(this), strong_code_roots_length); |
| 12080 | 740 *failures = true; |
| 741 } | |
| 742 return; | |
| 743 } | |
| 744 | |
| 745 VerifyStrongCodeRootCodeBlobClosure cb_cl(this); | |
| 746 strong_code_roots_do(&cb_cl); | |
| 747 | |
| 748 if (cb_cl.failures()) { | |
| 749 *failures = true; | |
| 750 } | |
| 751 } | |
| 752 | |
| 342 | 753 void HeapRegion::print() const { print_on(gclog_or_tty); } |
| 754 void HeapRegion::print_on(outputStream* st) const { | |
| 755 if (isHumongous()) { | |
| 756 if (startsHumongous()) | |
| 757 st->print(" HS"); | |
| 758 else | |
| 759 st->print(" HC"); | |
| 760 } else { | |
| 761 st->print(" "); | |
| 762 } | |
| 763 if (in_collection_set()) | |
| 764 st->print(" CS"); | |
| 765 else | |
| 766 st->print(" "); | |
| 767 if (is_young()) | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1388
diff
changeset
|
768 st->print(is_survivor() ? " SU" : " Y "); |
| 342 | 769 else |
| 770 st->print(" "); | |
| 771 if (is_empty()) | |
| 772 st->print(" F"); | |
| 773 else | |
| 774 st->print(" "); | |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4023
diff
changeset
|
775 st->print(" TS %5d", _gc_time_stamp); |
| 1388 | 776 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 777 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 778 G1OffsetTableContigSpace::print_on(st); |
| 779 } | |
| 780 | |
| 12080 | 781 class VerifyLiveClosure: public OopClosure { |
| 782 private: | |
| 783 G1CollectedHeap* _g1h; | |
| 784 CardTableModRefBS* _bs; | |
| 785 oop _containing_obj; | |
| 786 bool _failures; | |
| 787 int _n_failures; | |
| 788 VerifyOption _vo; | |
| 789 public: | |
| 790 // _vo == UsePrevMarking -> use "prev" marking information, | |
| 791 // _vo == UseNextMarking -> use "next" marking information, | |
| 792 // _vo == UseMarkWord -> use mark word from object header. | |
| 793 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : | |
| 794 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
| 795 _failures(false), _n_failures(0), _vo(vo) | |
| 796 { | |
| 797 BarrierSet* bs = _g1h->barrier_set(); | |
| 798 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 799 _bs = (CardTableModRefBS*)bs; | |
| 800 } | |
| 801 | |
| 802 void set_containing_obj(oop obj) { | |
| 803 _containing_obj = obj; | |
| 804 } | |
| 805 | |
| 806 bool failures() { return _failures; } | |
| 807 int n_failures() { return _n_failures; } | |
| 808 | |
| 809 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 810 virtual void do_oop( oop* p) { do_oop_work(p); } | |
| 811 | |
| 812 void print_object(outputStream* out, oop obj) { | |
| 813 #ifdef PRODUCT | |
| 814 Klass* k = obj->klass(); | |
| 815 const char* class_name = InstanceKlass::cast(k)->external_name(); | |
| 816 out->print_cr("class name %s", class_name); | |
| 817 #else // PRODUCT | |
| 818 obj->print_on(out); | |
| 819 #endif // PRODUCT | |
| 820 } | |
| 821 | |
| 822 template <class T> | |
| 823 void do_oop_work(T* p) { | |
| 824 assert(_containing_obj != NULL, "Precondition"); | |
| 825 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), | |
| 826 "Precondition"); | |
| 827 T heap_oop = oopDesc::load_heap_oop(p); | |
| 828 if (!oopDesc::is_null(heap_oop)) { | |
| 829 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 830 bool failed = false; | |
| 831 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { | |
| 832 MutexLockerEx x(ParGCRareEvent_lock, | |
| 833 Mutex::_no_safepoint_check_flag); | |
| 834 | |
| 835 if (!_failures) { | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17773
diff
changeset
|
836 gclog_or_tty->cr(); |
| 12080 | 837 gclog_or_tty->print_cr("----------"); |
| 838 } | |
| 839 if (!_g1h->is_in_closed_subset(obj)) { | |
| 840 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 841 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 842 " of live obj "PTR_FORMAT" in region " | |
| 843 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 844 p, (void*) _containing_obj, | |
| 845 from->bottom(), from->end()); | |
| 846 print_object(gclog_or_tty, _containing_obj); | |
| 847 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 848 (void*) obj); | |
| 849 } else { | |
| 850 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 851 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 852 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 853 " of live obj "PTR_FORMAT" in region " | |
| 854 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 855 p, (void*) _containing_obj, | |
| 856 from->bottom(), from->end()); | |
| 857 print_object(gclog_or_tty, _containing_obj); | |
| 858 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 859 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 860 (void*) obj, to->bottom(), to->end()); | |
| 861 print_object(gclog_or_tty, obj); | |
| 862 } | |
| 863 gclog_or_tty->print_cr("----------"); | |
| 864 gclog_or_tty->flush(); | |
| 865 _failures = true; | |
| 866 failed = true; | |
| 867 _n_failures++; | |
| 868 } | |
| 869 | |
| 870 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { | |
| 871 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 872 HeapRegion* to = _g1h->heap_region_containing(obj); | |
| 873 if (from != NULL && to != NULL && | |
| 874 from != to && | |
| 875 !to->isHumongous()) { | |
| 876 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 877 jbyte cv_field = *_bs->byte_for_const(p); | |
| 878 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 879 | |
| 880 bool is_bad = !(from->is_young() | |
| 881 || to->rem_set()->contains_reference(p) | |
| 882 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 883 (_containing_obj->is_objArray() ? | |
| 884 cv_field == dirty | |
| 885 : cv_obj == dirty || cv_field == dirty)); | |
| 886 if (is_bad) { | |
| 887 MutexLockerEx x(ParGCRareEvent_lock, | |
| 888 Mutex::_no_safepoint_check_flag); | |
| 889 | |
| 890 if (!_failures) { | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17773
diff
changeset
|
891 gclog_or_tty->cr(); |
| 12080 | 892 gclog_or_tty->print_cr("----------"); |
| 893 } | |
| 894 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 895 gclog_or_tty->print_cr("Field "PTR_FORMAT" " | |
| 896 "of obj "PTR_FORMAT", " | |
| 897 "in region "HR_FORMAT, | |
| 898 p, (void*) _containing_obj, | |
| 899 HR_FORMAT_PARAMS(from)); | |
| 900 _containing_obj->print_on(gclog_or_tty); | |
| 901 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " | |
| 902 "in region "HR_FORMAT, | |
| 903 (void*) obj, | |
| 904 HR_FORMAT_PARAMS(to)); | |
| 905 obj->print_on(gclog_or_tty); | |
| 906 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 907 cv_obj, cv_field); | |
| 908 gclog_or_tty->print_cr("----------"); | |
| 909 gclog_or_tty->flush(); | |
| 910 _failures = true; | |
| 911 if (!failed) _n_failures++; | |
| 912 } | |
| 913 } | |
| 914 } | |
| 915 } | |
| 916 } | |
| 917 }; | |
| 811 | 918 |
| 342 | 919 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
| 920 // We would need a mechanism to make that code skip dead objects. | |
| 921 | |
| 6008 | 922 void HeapRegion::verify(VerifyOption vo, |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
923 bool* failures) const { |
| 342 | 924 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
925 *failures = false; |
| 342 | 926 HeapWord* p = bottom(); |
| 927 HeapWord* prev_p = NULL; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
928 VerifyLiveClosure vl_cl(g1, vo); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
929 bool is_humongous = isHumongous(); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
930 bool do_bot_verify = !is_young(); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
931 size_t object_num = 0; |
| 342 | 932 while (p < top()) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
933 oop obj = oop(p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
934 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
935 object_num += 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
936 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
937 if (is_humongous != g1->isHumongous(obj_size)) { |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
938 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
|
939 SIZE_FORMAT" words) in a %shumongous region", |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
940 p, g1->isHumongous(obj_size) ? "" : "non-", |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
941 obj_size, is_humongous ? "" : "non-"); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
942 *failures = true; |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
943 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
944 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
945 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
946 // 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
|
947 // appropriate messasge. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
948 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
|
949 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
950 return; |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
951 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
952 |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
953 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
|
954 if (obj->is_oop()) { |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
955 Klass* klass = obj->klass(); |
| 11034 | 956 if (!klass->is_metaspace_object()) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
957 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
|
958 "not metadata", klass, (void *)obj); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
959 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
960 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
961 } else if (!klass->is_klass()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
962 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
|
963 "not a klass", klass, (void *)obj); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
964 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
965 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
966 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
967 vl_cl.set_containing_obj(obj); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6611
diff
changeset
|
968 obj->oop_iterate_no_header(&vl_cl); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
969 if (vl_cl.failures()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
970 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
971 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
972 if (G1MaxVerifyFailures >= 0 && |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
973 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
974 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
975 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
976 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
977 } else { |
|
12316
190899198332
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
12233
diff
changeset
|
978 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
|
979 *failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
980 return; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
981 } |
| 342 | 982 } |
| 983 prev_p = p; | |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
984 p += obj_size; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
985 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
986 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
987 if (p != top()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
988 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
|
989 "does not match top "PTR_FORMAT, p, top()); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
990 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
991 return; |
| 342 | 992 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
993 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
994 HeapWord* the_end = end(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
995 assert(p == top(), "it should still hold"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
996 // 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
|
997 // 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
|
998 // 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
|
999 if (p < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
1000 // Look up top |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
1001 HeapWord* addr_1 = p; |
|
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1002 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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1003 if (b_start_1 != p) { |
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1004 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
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1005 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1006 addr_1, b_start_1, p); |
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1007 *failures = true; |
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1008 return; |
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1009 } |
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1010 |
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1011 // Look up top + 1 |
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1012 HeapWord* addr_2 = p + 1; |
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1013 if (addr_2 < the_end) { |
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1014 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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1015 if (b_start_2 != p) { |
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1016 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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1017 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1018 addr_2, b_start_2, p); |
|
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1019 *failures = true; |
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1020 return; |
|
2133
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1021 } |
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1022 } |
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1023 |
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1024 // Look up an address between top and end |
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1025 size_t diff = pointer_delta(the_end, p) / 2; |
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1026 HeapWord* addr_3 = p + diff; |
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1027 if (addr_3 < the_end) { |
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1028 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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1029 if (b_start_3 != p) { |
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1030 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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1031 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1032 addr_3, b_start_3, p); |
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1033 *failures = true; |
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1034 return; |
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1035 } |
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1036 } |
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1037 |
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1038 // Loook up end - 1 |
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1039 HeapWord* addr_4 = the_end - 1; |
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1040 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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1041 if (b_start_4 != p) { |
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1042 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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1043 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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1044 addr_4, b_start_4, p); |
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1045 *failures = true; |
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1046 return; |
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1047 } |
| 342 | 1048 } |
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1049 |
|
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1050 if (is_humongous && object_num > 1) { |
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1051 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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1052 "but has "SIZE_FORMAT", objects", |
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1053 bottom(), end(), object_num); |
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1054 *failures = true; |
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1055 return; |
| 342 | 1056 } |
| 12080 | 1057 |
| 1058 verify_strong_code_roots(vo, failures); | |
| 1059 } | |
| 1060 | |
| 1061 void HeapRegion::verify() const { | |
| 1062 bool dummy = false; | |
| 1063 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); | |
| 342 | 1064 } |
| 1065 | |
| 1066 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
| 1067 // away eventually. | |
| 1068 | |
| 356 | 1069 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
| 1070 ContiguousSpace::clear(mangle_space); | |
| 342 | 1071 _offsets.zero_bottom_entry(); |
| 1072 _offsets.initialize_threshold(); | |
| 1073 } | |
| 1074 | |
| 1075 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 1076 Space::set_bottom(new_bottom); | |
| 1077 _offsets.set_bottom(new_bottom); | |
| 1078 } | |
| 1079 | |
| 1080 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 1081 Space::set_end(new_end); | |
| 1082 _offsets.resize(new_end - bottom()); | |
| 1083 } | |
| 1084 | |
| 1085 void G1OffsetTableContigSpace::print() const { | |
| 1086 print_short(); | |
| 1087 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 1088 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 1089 bottom(), top(), _offsets.threshold(), end()); | |
| 1090 } | |
| 1091 | |
| 1092 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 1093 return _offsets.initialize_threshold(); | |
| 1094 } | |
| 1095 | |
| 1096 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 1097 HeapWord* end) { | |
| 1098 _offsets.alloc_block(start, end); | |
| 1099 return _offsets.threshold(); | |
| 1100 } | |
| 1101 | |
| 1102 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 1103 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1104 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
| 1105 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
| 1106 return top(); | |
| 1107 else | |
| 1108 return ContiguousSpace::saved_mark_word(); | |
| 1109 } | |
| 1110 | |
| 1111 void G1OffsetTableContigSpace::set_saved_mark() { | |
| 1112 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1113 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 1114 | |
| 1115 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 1116 // The order of these is important, as another thread might be | |
| 1117 // about to start scanning this region. If it does so after | |
| 1118 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 1119 // will be false, and it will pick up top() as the high water mark | |
| 1120 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 1121 // will pick up the right saved_mark_word() as the high water mark | |
| 1122 // of the region. Either way, the behaviour will be correct. | |
| 1123 ContiguousSpace::set_saved_mark(); | |
|
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1124 OrderAccess::storestore(); |
|
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1125 _gc_time_stamp = curr_gc_time_stamp; |
|
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1126 // No need to do another barrier to flush the writes above. If |
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1127 // this is called in parallel with other threads trying to |
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1128 // allocate into the region, the caller should call this while |
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1129 // holding a lock and when the lock is released the writes will be |
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1130 // flushed. |
| 342 | 1131 } |
| 1132 } | |
| 1133 | |
| 1134 G1OffsetTableContigSpace:: | |
| 1135 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
|
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1136 MemRegion mr) : |
| 342 | 1137 _offsets(sharedOffsetArray, mr), |
| 1138 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 1139 _gc_time_stamp(0) | |
| 1140 { | |
| 1141 _offsets.set_space(this); | |
|
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1142 // false ==> we'll do the clearing if there's clearing to be done. |
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1143 ContiguousSpace::initialize(mr, false, SpaceDecorator::Mangle); |
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1144 _offsets.zero_bottom_entry(); |
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1145 _offsets.initialize_threshold(); |
| 342 | 1146 } |