Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 20213:ff7b317d2af8
8037344: Use the "next" field to iterate over fine remembered instead of using the hash table
Summary: After changes to the PerRegionTable where all these PRTs are linked together in an additional field, simplify iterating over all PRTs by using these links instead of walki
Reviewed-by: mgerdin, jwilhelm, brutisso
author | tschatzl |
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date | Mon, 21 Jul 2014 09:40:19 +0200 |
parents | c49dcaf78a65 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
12080 | 26 #include "code/nmethod.hpp" |
1972 | 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
29 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
30 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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", |
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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()) | |
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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(" "); | |
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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
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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
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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
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923 bool* failures) const { |
342 | 924 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
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925 *failures = false; |
342 | 926 HeapWord* p = bottom(); |
927 HeapWord* prev_p = NULL; | |
3772
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928 VerifyLiveClosure vl_cl(g1, vo); |
1718
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929 bool is_humongous = isHumongous(); |
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930 bool do_bot_verify = !is_young(); |
1718
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931 size_t object_num = 0; |
342 | 932 while (p < top()) { |
2133
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933 oop obj = oop(p); |
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934 size_t obj_size = obj->size(); |
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935 object_num += 1; |
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936 |
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937 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
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938 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
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939 SIZE_FORMAT" words) in a %shumongous region", |
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940 p, g1->isHumongous(obj_size) ? "" : "non-", |
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941 obj_size, is_humongous ? "" : "non-"); |
1718
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942 *failures = true; |
2133
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943 return; |
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|
944 } |
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945 |
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946 // If it returns false, verify_for_object() will output the |
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947 // appropriate messasge. |
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948 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
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949 *failures = true; |
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950 return; |
1718
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951 } |
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952 |
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953 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
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954 if (obj->is_oop()) { |
6725
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955 Klass* klass = obj->klass(); |
11034 | 956 if (!klass->is_metaspace_object()) { |
2133
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957 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
12316
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958 "not metadata", klass, (void *)obj); |
2133
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959 *failures = true; |
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960 return; |
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961 } else if (!klass->is_klass()) { |
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962 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
12316
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963 "not a klass", klass, (void *)obj); |
2133
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964 *failures = true; |
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|
965 return; |
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|
966 } else { |
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967 vl_cl.set_containing_obj(obj); |
6725
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968 obj->oop_iterate_no_header(&vl_cl); |
2133
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|
969 if (vl_cl.failures()) { |
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|
970 *failures = true; |
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|
971 } |
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972 if (G1MaxVerifyFailures >= 0 && |
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973 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
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diff
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|
974 return; |
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1972
diff
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|
975 } |
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|
976 } |
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977 } else { |
12316
190899198332
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12233
diff
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|
978 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", (void *)obj); |
1020
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979 *failures = true; |
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942
diff
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|
980 return; |
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942
diff
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|
981 } |
342 | 982 } |
983 prev_p = p; | |
2133
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984 p += obj_size; |
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985 } |
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|
986 |
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|
987 if (p != top()) { |
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988 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
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989 "does not match top "PTR_FORMAT, p, top()); |
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990 *failures = true; |
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991 return; |
342 | 992 } |
2133
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993 |
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994 HeapWord* the_end = end(); |
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995 assert(p == top(), "it should still hold"); |
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996 // Do some extra BOT consistency checking for addresses in the |
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997 // range [top, end). BOT look-ups in this range should yield |
2250ee17e258
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998 // top. No point in doing that if top == end (there's nothing there). |
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diff
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|
999 if (p < the_end) { |
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diff
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|
1000 // Look up top |
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|
1001 HeapWord* addr_1 = p; |
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|
1002 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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diff
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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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diff
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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); |
1020
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1019 *failures = true; |
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diff
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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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diff
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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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diff
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|
1029 if (b_start_3 != p) { |
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diff
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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; |
1020
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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(); |
353
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1125 _gc_time_stamp = curr_gc_time_stamp; |
2433
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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 } |