Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 2133:2250ee17e258
7007068: G1: refine the BOT during evac failure handling
Summary: During evacuation failure handling we refine the BOT to reflect the location of all the objects in the regions we scan. The changeset includes some minor cleanup: a) non-product print_on() method on the G1 BOT class, b) added more complete BOT verification during heap / region verification, c) slight modification to the BOT set up for humongous regions to be more consistent with the BOT set up during evac failure handling, and d) removed a couple of unused methods.
Reviewed-by: johnc, ysr
author | tonyp |
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date | Wed, 12 Jan 2011 13:06:00 -0500 |
parents | f95d63e2154a |
children | 0fa27f37d4d4 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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" |
26 #include "gc_implementation/g1/concurrentZFThread.hpp" | |
27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
29 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
30 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
32 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
33 #include "memory/genOopClosures.inline.hpp" | |
34 #include "memory/iterator.hpp" | |
35 #include "oops/oop.inline.hpp" | |
342 | 36 |
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37 int HeapRegion::LogOfHRGrainBytes = 0; |
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38 int HeapRegion::LogOfHRGrainWords = 0; |
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39 int HeapRegion::GrainBytes = 0; |
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40 int HeapRegion::GrainWords = 0; |
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41 int HeapRegion::CardsPerRegion = 0; |
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42 |
342 | 43 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
44 HeapRegion* hr, OopClosure* cl, | |
45 CardTableModRefBS::PrecisionStyle precision, | |
46 FilterKind fk) : | |
47 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
48 _hr(hr), _fk(fk), _g1(g1) | |
49 {} | |
50 | |
51 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
52 OopClosure* oc) : | |
53 _r_bottom(r->bottom()), _r_end(r->end()), | |
54 _oc(oc), _out_of_region(0) | |
55 {} | |
56 | |
57 class VerifyLiveClosure: public OopClosure { | |
811 | 58 private: |
342 | 59 G1CollectedHeap* _g1h; |
60 CardTableModRefBS* _bs; | |
61 oop _containing_obj; | |
62 bool _failures; | |
63 int _n_failures; | |
811 | 64 bool _use_prev_marking; |
342 | 65 public: |
811 | 66 // use_prev_marking == true -> use "prev" marking information, |
67 // use_prev_marking == false -> use "next" marking information | |
68 VerifyLiveClosure(G1CollectedHeap* g1h, bool use_prev_marking) : | |
342 | 69 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
811 | 70 _failures(false), _n_failures(0), _use_prev_marking(use_prev_marking) |
342 | 71 { |
72 BarrierSet* bs = _g1h->barrier_set(); | |
73 if (bs->is_a(BarrierSet::CardTableModRef)) | |
74 _bs = (CardTableModRefBS*)bs; | |
75 } | |
76 | |
77 void set_containing_obj(oop obj) { | |
78 _containing_obj = obj; | |
79 } | |
80 | |
81 bool failures() { return _failures; } | |
82 int n_failures() { return _n_failures; } | |
83 | |
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84 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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85 virtual void do_oop( oop* p) { do_oop_work(p); } |
342 | 86 |
1388 | 87 void print_object(outputStream* out, oop obj) { |
88 #ifdef PRODUCT | |
89 klassOop k = obj->klass(); | |
90 const char* class_name = instanceKlass::cast(k)->external_name(); | |
91 out->print_cr("class name %s", class_name); | |
92 #else // PRODUCT | |
93 obj->print_on(out); | |
94 #endif // PRODUCT | |
95 } | |
96 | |
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97 template <class T> void do_oop_work(T* p) { |
342 | 98 assert(_containing_obj != NULL, "Precondition"); |
811 | 99 assert(!_g1h->is_obj_dead_cond(_containing_obj, _use_prev_marking), |
100 "Precondition"); | |
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101 T heap_oop = oopDesc::load_heap_oop(p); |
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102 if (!oopDesc::is_null(heap_oop)) { |
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103 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 104 bool failed = false; |
811 | 105 if (!_g1h->is_in_closed_subset(obj) || |
106 _g1h->is_obj_dead_cond(obj, _use_prev_marking)) { | |
342 | 107 if (!_failures) { |
108 gclog_or_tty->print_cr(""); | |
109 gclog_or_tty->print_cr("----------"); | |
110 } | |
111 if (!_g1h->is_in_closed_subset(obj)) { | |
1388 | 112 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
342 | 113 gclog_or_tty->print_cr("Field "PTR_FORMAT |
1388 | 114 " of live obj "PTR_FORMAT" in region " |
115 "["PTR_FORMAT", "PTR_FORMAT")", | |
116 p, (void*) _containing_obj, | |
117 from->bottom(), from->end()); | |
118 print_object(gclog_or_tty, _containing_obj); | |
119 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
120 (void*) obj); | |
121 } else { | |
122 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
123 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
124 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
125 " of live obj "PTR_FORMAT" in region " | |
126 "["PTR_FORMAT", "PTR_FORMAT")", | |
127 p, (void*) _containing_obj, | |
128 from->bottom(), from->end()); | |
129 print_object(gclog_or_tty, _containing_obj); | |
130 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
131 "["PTR_FORMAT", "PTR_FORMAT")", | |
132 (void*) obj, to->bottom(), to->end()); | |
133 print_object(gclog_or_tty, obj); | |
342 | 134 } |
135 gclog_or_tty->print_cr("----------"); | |
136 _failures = true; | |
137 failed = true; | |
138 _n_failures++; | |
139 } | |
140 | |
141 if (!_g1h->full_collection()) { | |
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142 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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143 HeapRegion* to = _g1h->heap_region_containing(obj); |
342 | 144 if (from != NULL && to != NULL && |
145 from != to && | |
146 !to->isHumongous()) { | |
147 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
148 jbyte cv_field = *_bs->byte_for_const(p); | |
149 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
150 | |
151 bool is_bad = !(from->is_young() | |
152 || to->rem_set()->contains_reference(p) | |
153 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
154 (_containing_obj->is_objArray() ? | |
155 cv_field == dirty | |
156 : cv_obj == dirty || cv_field == dirty)); | |
157 if (is_bad) { | |
158 if (!_failures) { | |
159 gclog_or_tty->print_cr(""); | |
160 gclog_or_tty->print_cr("----------"); | |
161 } | |
162 gclog_or_tty->print_cr("Missing rem set entry:"); | |
163 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
164 " of obj "PTR_FORMAT | |
165 ", in region %d ["PTR_FORMAT | |
166 ", "PTR_FORMAT"),", | |
167 p, (void*) _containing_obj, | |
168 from->hrs_index(), | |
169 from->bottom(), | |
170 from->end()); | |
171 _containing_obj->print_on(gclog_or_tty); | |
172 gclog_or_tty->print_cr("points to obj "PTR_FORMAT | |
173 " in region %d ["PTR_FORMAT | |
174 ", "PTR_FORMAT").", | |
175 (void*) obj, to->hrs_index(), | |
176 to->bottom(), to->end()); | |
177 obj->print_on(gclog_or_tty); | |
178 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
179 cv_obj, cv_field); | |
180 gclog_or_tty->print_cr("----------"); | |
181 _failures = true; | |
182 if (!failed) _n_failures++; | |
183 } | |
184 } | |
185 } | |
186 } | |
187 } | |
188 }; | |
189 | |
190 template<class ClosureType> | |
191 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
192 HeapRegion* hr, | |
193 HeapWord* cur, HeapWord* top) { | |
194 oop cur_oop = oop(cur); | |
195 int oop_size = cur_oop->size(); | |
196 HeapWord* next_obj = cur + oop_size; | |
197 while (next_obj < top) { | |
198 // Keep filtering the remembered set. | |
199 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
200 // Bottom lies entirely below top, so we can call the | |
201 // non-memRegion version of oop_iterate below. | |
202 cur_oop->oop_iterate(cl); | |
203 } | |
204 cur = next_obj; | |
205 cur_oop = oop(cur); | |
206 oop_size = cur_oop->size(); | |
207 next_obj = cur + oop_size; | |
208 } | |
209 return cur; | |
210 } | |
211 | |
212 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
213 HeapWord* bottom, | |
214 HeapWord* top, | |
215 OopClosure* cl) { | |
216 G1CollectedHeap* g1h = _g1; | |
217 | |
218 int oop_size; | |
219 | |
220 OopClosure* cl2 = cl; | |
221 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
222 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
223 switch (_fk) { | |
224 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
225 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
226 } | |
227 | |
228 // Start filtering what we add to the remembered set. If the object is | |
229 // not considered dead, either because it is marked (in the mark bitmap) | |
230 // or it was allocated after marking finished, then we add it. Otherwise | |
231 // we can safely ignore the object. | |
232 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
233 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
234 } else { | |
235 oop_size = oop(bottom)->size(); | |
236 } | |
237 | |
238 bottom += oop_size; | |
239 | |
240 if (bottom < top) { | |
241 // We replicate the loop below for several kinds of possible filters. | |
242 switch (_fk) { | |
243 case NoFilterKind: | |
244 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
245 break; | |
246 case IntoCSFilterKind: { | |
247 FilterIntoCSClosure filt(this, g1h, cl); | |
248 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
249 break; | |
250 } | |
251 case OutOfRegionFilterKind: { | |
252 FilterOutOfRegionClosure filt(_hr, cl); | |
253 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
254 break; | |
255 } | |
256 default: | |
257 ShouldNotReachHere(); | |
258 } | |
259 | |
260 // Last object. Need to do dead-obj filtering here too. | |
261 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
262 oop(bottom)->oop_iterate(cl2, mr); | |
263 } | |
264 } | |
265 } | |
266 | |
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267 // Minimum region size; we won't go lower than that. |
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268 // We might want to decrease this in the future, to deal with small |
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269 // heaps a bit more efficiently. |
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270 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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271 |
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272 // Maximum region size; we don't go higher than that. There's a good |
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273 // reason for having an upper bound. We don't want regions to get too |
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274 // large, otherwise cleanup's effectiveness would decrease as there |
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275 // will be fewer opportunities to find totally empty regions after |
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276 // marking. |
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277 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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278 |
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279 // The automatic region size calculation will try to have around this |
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280 // many regions in the heap (based on the min heap size). |
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281 #define TARGET_REGION_NUMBER 2048 |
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282 |
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283 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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284 // region_size in bytes |
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285 uintx region_size = G1HeapRegionSize; |
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286 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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287 // We base the automatic calculation on the min heap size. This |
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288 // can be problematic if the spread between min and max is quite |
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289 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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290 // the max size, the region size might be way too large for the |
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291 // min size. Either way, some users might have to set the region |
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292 // size manually for some -Xms / -Xmx combos. |
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293 |
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294 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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295 (uintx) MIN_REGION_SIZE); |
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296 } |
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297 |
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298 int region_size_log = log2_long((jlong) region_size); |
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299 // Recalculate the region size to make sure it's a power of |
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300 // 2. This means that region_size is the largest power of 2 that's |
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301 // <= what we've calculated so far. |
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302 region_size = ((uintx)1 << region_size_log); |
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303 |
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304 // Now make sure that we don't go over or under our limits. |
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305 if (region_size < MIN_REGION_SIZE) { |
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306 region_size = MIN_REGION_SIZE; |
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307 } else if (region_size > MAX_REGION_SIZE) { |
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308 region_size = MAX_REGION_SIZE; |
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309 } |
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310 |
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311 // And recalculate the log. |
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312 region_size_log = log2_long((jlong) region_size); |
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313 |
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314 // Now, set up the globals. |
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315 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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316 LogOfHRGrainBytes = region_size_log; |
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317 |
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318 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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319 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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320 |
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321 guarantee(GrainBytes == 0, "we should only set it once"); |
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322 // The cast to int is safe, given that we've bounded region_size by |
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323 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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324 GrainBytes = (int) region_size; |
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325 |
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326 guarantee(GrainWords == 0, "we should only set it once"); |
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327 GrainWords = GrainBytes >> LogHeapWordSize; |
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328 guarantee(1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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329 |
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330 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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331 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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332 } |
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333 |
342 | 334 void HeapRegion::reset_after_compaction() { |
335 G1OffsetTableContigSpace::reset_after_compaction(); | |
336 // After a compaction the mark bitmap is invalid, so we must | |
337 // treat all objects as being inside the unmarked area. | |
338 zero_marked_bytes(); | |
339 init_top_at_mark_start(); | |
340 } | |
341 | |
342 DirtyCardToOopClosure* | |
343 HeapRegion::new_dcto_closure(OopClosure* cl, | |
344 CardTableModRefBS::PrecisionStyle precision, | |
345 HeapRegionDCTOC::FilterKind fk) { | |
346 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
347 this, cl, precision, fk); | |
348 } | |
349 | |
350 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
355 | 351 _humongous_type = NotHumongous; |
342 | 352 _humongous_start_region = NULL; |
353 _in_collection_set = false; | |
354 _is_gc_alloc_region = false; | |
355 | |
356 // Age stuff (if parallel, this will be done separately, since it needs | |
357 // to be sequential). | |
358 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
359 | |
360 set_young_index_in_cset(-1); | |
361 uninstall_surv_rate_group(); | |
362 set_young_type(NotYoung); | |
363 | |
364 // In case it had been the start of a humongous sequence, reset its end. | |
365 set_end(_orig_end); | |
366 | |
367 if (!par) { | |
368 // If this is parallel, this will be done later. | |
369 HeapRegionRemSet* hrrs = rem_set(); | |
370 if (hrrs != NULL) hrrs->clear(); | |
355 | 371 _claimed = InitialClaimValue; |
342 | 372 } |
373 zero_marked_bytes(); | |
374 set_sort_index(-1); | |
375 | |
376 _offsets.resize(HeapRegion::GrainWords); | |
377 init_top_at_mark_start(); | |
356 | 378 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 379 } |
380 | |
381 // <PREDICTION> | |
382 void HeapRegion::calc_gc_efficiency() { | |
383 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
384 _gc_efficiency = (double) garbage_bytes() / | |
385 g1h->predict_region_elapsed_time_ms(this, false); | |
386 } | |
387 // </PREDICTION> | |
388 | |
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389 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
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390 assert(end() == _orig_end, |
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391 "Should be normal before the humongous object allocation"); |
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392 assert(top() == bottom(), "should be empty"); |
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393 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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394 |
355 | 395 _humongous_type = StartsHumongous; |
342 | 396 _humongous_start_region = this; |
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397 |
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398 set_end(new_end); |
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399 _offsets.set_for_starts_humongous(new_top); |
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400 } |
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401 |
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402 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
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403 assert(end() == _orig_end, |
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404 "Should be normal before the humongous object allocation"); |
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405 assert(top() == bottom(), "should be empty"); |
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406 assert(first_hr->startsHumongous(), "pre-condition"); |
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407 |
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408 _humongous_type = ContinuesHumongous; |
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409 _humongous_start_region = first_hr; |
342 | 410 } |
411 | |
412 bool HeapRegion::claimHeapRegion(jint claimValue) { | |
413 jint current = _claimed; | |
414 if (current != claimValue) { | |
415 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
416 if (res == current) { | |
417 return true; | |
418 } | |
419 } | |
420 return false; | |
421 } | |
422 | |
423 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
424 HeapWord* low = addr; | |
425 HeapWord* high = end(); | |
426 while (low < high) { | |
427 size_t diff = pointer_delta(high, low); | |
428 // Must add one below to bias toward the high amount. Otherwise, if | |
429 // "high" were at the desired value, and "low" were one less, we | |
430 // would not converge on "high". This is not symmetric, because | |
431 // we set "high" to a block start, which might be the right one, | |
432 // which we don't do for "low". | |
433 HeapWord* middle = low + (diff+1)/2; | |
434 if (middle == high) return high; | |
435 HeapWord* mid_bs = block_start_careful(middle); | |
436 if (mid_bs < addr) { | |
437 low = middle; | |
438 } else { | |
439 high = mid_bs; | |
440 } | |
441 } | |
442 assert(low == high && low >= addr, "Didn't work."); | |
443 return low; | |
444 } | |
445 | |
446 void HeapRegion::set_next_on_unclean_list(HeapRegion* r) { | |
447 assert(r == NULL || r->is_on_unclean_list(), "Malformed unclean list."); | |
448 _next_in_special_set = r; | |
449 } | |
450 | |
451 void HeapRegion::set_on_unclean_list(bool b) { | |
452 _is_on_unclean_list = b; | |
453 } | |
454 | |
356 | 455 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
456 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
342 | 457 hr_clear(false/*par*/, clear_space); |
458 } | |
459 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
460 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
461 #endif // _MSC_VER | |
462 | |
463 | |
464 HeapRegion:: | |
465 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
466 MemRegion mr, bool is_zeroed) | |
467 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), | |
468 _next_fk(HeapRegionDCTOC::NoFilterKind), | |
469 _hrs_index(-1), | |
355 | 470 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
342 | 471 _in_collection_set(false), _is_gc_alloc_region(false), |
472 _is_on_free_list(false), _is_on_unclean_list(false), | |
473 _next_in_special_set(NULL), _orig_end(NULL), | |
355 | 474 _claimed(InitialClaimValue), _evacuation_failed(false), |
342 | 475 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
476 _young_type(NotYoung), _next_young_region(NULL), | |
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477 _next_dirty_cards_region(NULL), |
342 | 478 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), |
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479 _rem_set(NULL), _zfs(NotZeroFilled), |
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480 _recorded_rs_length(0), _predicted_elapsed_time_ms(0), |
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481 _predicted_bytes_to_copy(0) |
342 | 482 { |
483 _orig_end = mr.end(); | |
484 // Note that initialize() will set the start of the unmarked area of the | |
485 // region. | |
356 | 486 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
487 set_top(bottom()); | |
488 set_saved_mark(); | |
342 | 489 |
490 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
491 | |
492 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
493 // In case the region is allocated during a pause, note the top. | |
494 // We haven't done any counting on a brand new region. | |
495 _top_at_conc_mark_count = bottom(); | |
496 } | |
497 | |
498 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
499 const HeapRegion* _target; | |
500 bool _target_seen; | |
501 HeapRegion* _last; | |
502 CompactibleSpace* _res; | |
503 public: | |
504 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
505 _target(target), _target_seen(false), _res(NULL) {} | |
506 bool doHeapRegion(HeapRegion* cur) { | |
507 if (_target_seen) { | |
508 if (!cur->isHumongous()) { | |
509 _res = cur; | |
510 return true; | |
511 } | |
512 } else if (cur == _target) { | |
513 _target_seen = true; | |
514 } | |
515 return false; | |
516 } | |
517 CompactibleSpace* result() { return _res; } | |
518 }; | |
519 | |
520 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
521 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
522 // cast away const-ness | |
523 HeapRegion* r = (HeapRegion*) this; | |
524 NextCompactionHeapRegionClosure blk(r); | |
525 g1h->heap_region_iterate_from(r, &blk); | |
526 return blk.result(); | |
527 } | |
528 | |
529 void HeapRegion::save_marks() { | |
530 set_saved_mark(); | |
531 } | |
532 | |
533 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
534 HeapWord* p = mr.start(); | |
535 HeapWord* e = mr.end(); | |
536 oop obj; | |
537 while (p < e) { | |
538 obj = oop(p); | |
539 p += obj->oop_iterate(cl); | |
540 } | |
541 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
542 } | |
543 | |
544 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
545 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
546 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
547 } | |
548 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
549 | |
550 | |
551 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
552 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
553 } | |
554 | |
555 #ifdef DEBUG | |
556 HeapWord* HeapRegion::allocate(size_t size) { | |
557 jint state = zero_fill_state(); | |
558 assert(!G1CollectedHeap::heap()->allocs_are_zero_filled() || | |
559 zero_fill_is_allocated(), | |
560 "When ZF is on, only alloc in ZF'd regions"); | |
561 return G1OffsetTableContigSpace::allocate(size); | |
562 } | |
563 #endif | |
564 | |
565 void HeapRegion::set_zero_fill_state_work(ZeroFillState zfs) { | |
566 assert(ZF_mon->owned_by_self() || | |
567 Universe::heap()->is_gc_active(), | |
568 "Must hold the lock or be a full GC to modify."); | |
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569 #ifdef ASSERT |
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570 if (top() != bottom() && zfs != Allocated) { |
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571 ResourceMark rm; |
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572 stringStream region_str; |
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573 print_on(®ion_str); |
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574 assert(top() == bottom() || zfs == Allocated, |
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575 err_msg("Region must be empty, or we must be setting it to allocated. " |
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576 "_zfs=%d, zfs=%d, region: %s", _zfs, zfs, region_str.as_string())); |
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577 } |
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578 #endif |
342 | 579 _zfs = zfs; |
580 } | |
581 | |
582 void HeapRegion::set_zero_fill_complete() { | |
583 set_zero_fill_state_work(ZeroFilled); | |
584 if (ZF_mon->owned_by_self()) { | |
585 ZF_mon->notify_all(); | |
586 } | |
587 } | |
588 | |
589 | |
590 void HeapRegion::ensure_zero_filled() { | |
591 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
592 ensure_zero_filled_locked(); | |
593 } | |
594 | |
595 void HeapRegion::ensure_zero_filled_locked() { | |
596 assert(ZF_mon->owned_by_self(), "Precondition"); | |
597 bool should_ignore_zf = SafepointSynchronize::is_at_safepoint(); | |
598 assert(should_ignore_zf || Heap_lock->is_locked(), | |
599 "Either we're in a GC or we're allocating a region."); | |
600 switch (zero_fill_state()) { | |
601 case HeapRegion::NotZeroFilled: | |
602 set_zero_fill_in_progress(Thread::current()); | |
603 { | |
604 ZF_mon->unlock(); | |
605 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
606 ZF_mon->lock_without_safepoint_check(); | |
607 } | |
608 // A trap. | |
609 guarantee(zero_fill_state() == HeapRegion::ZeroFilling | |
610 && zero_filler() == Thread::current(), | |
611 "AHA! Tell Dave D if you see this..."); | |
612 set_zero_fill_complete(); | |
613 // gclog_or_tty->print_cr("Did sync ZF."); | |
614 ConcurrentZFThread::note_sync_zfs(); | |
615 break; | |
616 case HeapRegion::ZeroFilling: | |
617 if (should_ignore_zf) { | |
618 // We can "break" the lock and take over the work. | |
619 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
620 set_zero_fill_complete(); | |
621 ConcurrentZFThread::note_sync_zfs(); | |
622 break; | |
623 } else { | |
624 ConcurrentZFThread::wait_for_ZF_completed(this); | |
625 } | |
626 case HeapRegion::ZeroFilled: | |
627 // Nothing to do. | |
628 break; | |
629 case HeapRegion::Allocated: | |
630 guarantee(false, "Should not call on allocated regions."); | |
631 } | |
632 assert(zero_fill_state() == HeapRegion::ZeroFilled, "Post"); | |
633 } | |
634 | |
635 HeapWord* | |
636 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
637 ObjectClosure* cl) { | |
638 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
639 // We used to use "block_start_careful" here. But we're actually happy | |
640 // to update the BOT while we do this... | |
641 HeapWord* cur = block_start(mr.start()); | |
642 mr = mr.intersection(used_region()); | |
643 if (mr.is_empty()) return NULL; | |
644 // Otherwise, find the obj that extends onto mr.start(). | |
645 | |
646 assert(cur <= mr.start() | |
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647 && (oop(cur)->klass_or_null() == NULL || |
342 | 648 cur + oop(cur)->size() > mr.start()), |
649 "postcondition of block_start"); | |
650 oop obj; | |
651 while (cur < mr.end()) { | |
652 obj = oop(cur); | |
845
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653 if (obj->klass_or_null() == NULL) { |
342 | 654 // Ran into an unparseable point. |
655 return cur; | |
656 } else if (!g1h->is_obj_dead(obj)) { | |
657 cl->do_object(obj); | |
658 } | |
659 if (cl->abort()) return cur; | |
660 // The check above must occur before the operation below, since an | |
661 // abort might invalidate the "size" operation. | |
662 cur += obj->size(); | |
663 } | |
664 return NULL; | |
665 } | |
666 | |
667 HeapWord* | |
668 HeapRegion:: | |
669 oops_on_card_seq_iterate_careful(MemRegion mr, | |
1666
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670 FilterOutOfRegionClosure* cl, |
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671 bool filter_young) { |
342 | 672 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
673 | |
674 // If we're within a stop-world GC, then we might look at a card in a | |
675 // GC alloc region that extends onto a GC LAB, which may not be | |
676 // parseable. Stop such at the "saved_mark" of the region. | |
677 if (G1CollectedHeap::heap()->is_gc_active()) { | |
678 mr = mr.intersection(used_region_at_save_marks()); | |
679 } else { | |
680 mr = mr.intersection(used_region()); | |
681 } | |
682 if (mr.is_empty()) return NULL; | |
683 // Otherwise, find the obj that extends onto mr.start(). | |
684 | |
1666
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685 // The intersection of the incoming mr (for the card) and the |
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686 // allocated part of the region is non-empty. This implies that |
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687 // we have actually allocated into this region. The code in |
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688 // G1CollectedHeap.cpp that allocates a new region sets the |
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689 // is_young tag on the region before allocating. Thus we |
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690 // safely know if this region is young. |
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691 if (is_young() && filter_young) { |
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692 return NULL; |
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693 } |
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|
694 |
1705 | 695 assert(!is_young(), "check value of filter_young"); |
696 | |
342 | 697 // We used to use "block_start_careful" here. But we're actually happy |
698 // to update the BOT while we do this... | |
699 HeapWord* cur = block_start(mr.start()); | |
700 assert(cur <= mr.start(), "Postcondition"); | |
701 | |
702 while (cur <= mr.start()) { | |
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703 if (oop(cur)->klass_or_null() == NULL) { |
342 | 704 // Ran into an unparseable point. |
705 return cur; | |
706 } | |
707 // Otherwise... | |
708 int sz = oop(cur)->size(); | |
709 if (cur + sz > mr.start()) break; | |
710 // Otherwise, go on. | |
711 cur = cur + sz; | |
712 } | |
713 oop obj; | |
714 obj = oop(cur); | |
715 // If we finish this loop... | |
716 assert(cur <= mr.start() | |
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717 && obj->klass_or_null() != NULL |
342 | 718 && cur + obj->size() > mr.start(), |
719 "Loop postcondition"); | |
720 if (!g1h->is_obj_dead(obj)) { | |
721 obj->oop_iterate(cl, mr); | |
722 } | |
723 | |
724 HeapWord* next; | |
725 while (cur < mr.end()) { | |
726 obj = oop(cur); | |
845
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727 if (obj->klass_or_null() == NULL) { |
342 | 728 // Ran into an unparseable point. |
729 return cur; | |
730 }; | |
731 // Otherwise: | |
732 next = (cur + obj->size()); | |
733 if (!g1h->is_obj_dead(obj)) { | |
734 if (next < mr.end()) { | |
735 obj->oop_iterate(cl); | |
736 } else { | |
737 // this obj spans the boundary. If it's an array, stop at the | |
738 // boundary. | |
739 if (obj->is_objArray()) { | |
740 obj->oop_iterate(cl, mr); | |
741 } else { | |
742 obj->oop_iterate(cl); | |
743 } | |
744 } | |
745 } | |
746 cur = next; | |
747 } | |
748 return NULL; | |
749 } | |
750 | |
751 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
752 void HeapRegion::print_on(outputStream* st) const { | |
753 if (isHumongous()) { | |
754 if (startsHumongous()) | |
755 st->print(" HS"); | |
756 else | |
757 st->print(" HC"); | |
758 } else { | |
759 st->print(" "); | |
760 } | |
761 if (in_collection_set()) | |
762 st->print(" CS"); | |
763 else if (is_gc_alloc_region()) | |
764 st->print(" A "); | |
765 else | |
766 st->print(" "); | |
767 if (is_young()) | |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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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(" %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 | |
811 | 781 void HeapRegion::verify(bool allow_dirty) const { |
1020
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|
782 bool dummy = false; |
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|
783 verify(allow_dirty, /* use_prev_marking */ true, /* failures */ &dummy); |
811 | 784 } |
785 | |
342 | 786 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
787 // We would need a mechanism to make that code skip dead objects. | |
788 | |
1020
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789 void HeapRegion::verify(bool allow_dirty, |
ff2402f6a50b
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|
790 bool use_prev_marking, |
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|
791 bool* failures) const { |
342 | 792 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
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793 *failures = false; |
342 | 794 HeapWord* p = bottom(); |
795 HeapWord* prev_p = NULL; | |
811 | 796 VerifyLiveClosure vl_cl(g1, use_prev_marking); |
1718
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6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
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|
797 bool is_humongous = isHumongous(); |
2133
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798 bool do_bot_verify = !is_young(); |
1718
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6974928: G1: sometimes humongous objects are allocated in young regions
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|
799 size_t object_num = 0; |
342 | 800 while (p < top()) { |
2133
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|
801 oop obj = oop(p); |
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|
802 size_t obj_size = obj->size(); |
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|
803 object_num += 1; |
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diff
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|
804 |
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805 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
806 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
|
807 SIZE_FORMAT" words) in a %shumongous region", |
2133
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tonyp
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diff
changeset
|
808 p, g1->isHumongous(obj_size) ? "" : "non-", |
2250ee17e258
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tonyp
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diff
changeset
|
809 obj_size, is_humongous ? "" : "non-"); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
810 *failures = true; |
2133
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7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
811 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
812 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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diff
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|
813 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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1972
diff
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|
814 // 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
|
815 // appropriate messasge. |
2250ee17e258
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1972
diff
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|
816 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
817 *failures = true; |
2250ee17e258
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parents:
1972
diff
changeset
|
818 return; |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
819 } |
2133
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diff
changeset
|
820 |
2250ee17e258
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diff
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|
821 if (!g1->is_obj_dead_cond(obj, this, use_prev_marking)) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
822 if (obj->is_oop()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
823 klassOop klass = obj->klass(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
824 if (!klass->is_perm()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
825 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
826 "not in perm", klass, obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
827 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
828 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
829 } else if (!klass->is_klass()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
830 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
831 "not a klass", klass, obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
832 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
833 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
834 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
835 vl_cl.set_containing_obj(obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
836 obj->oop_iterate(&vl_cl); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
837 if (vl_cl.failures()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
838 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
839 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
840 if (G1MaxVerifyFailures >= 0 && |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
841 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
842 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
843 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
844 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
845 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
846 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
942
diff
changeset
|
847 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
848 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
849 } |
342 | 850 } |
851 prev_p = p; | |
2133
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7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
852 p += obj_size; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
853 } |
2250ee17e258
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1972
diff
changeset
|
854 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
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|
855 if (p != top()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
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diff
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|
856 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
|
857 "does not match top "PTR_FORMAT, p, top()); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
858 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
859 return; |
342 | 860 } |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
861 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
862 HeapWord* the_end = end(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
863 assert(p == top(), "it should still hold"); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
864 // 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
|
865 // 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
|
866 // 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
|
867 if (p < the_end) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
868 // Look up top |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
869 HeapWord* addr_1 = p; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
870 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
871 if (b_start_1 != p) { |
2250ee17e258
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parents:
1972
diff
changeset
|
872 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
873 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
874 addr_1, b_start_1, p); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
875 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
876 return; |
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
877 } |
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878 |
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879 // Look up top + 1 |
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880 HeapWord* addr_2 = p + 1; |
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881 if (addr_2 < the_end) { |
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882 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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883 if (b_start_2 != p) { |
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884 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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885 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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886 addr_2, b_start_2, p); |
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887 *failures = true; |
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888 return; |
2133
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889 } |
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890 } |
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891 |
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892 // Look up an address between top and end |
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893 size_t diff = pointer_delta(the_end, p) / 2; |
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894 HeapWord* addr_3 = p + diff; |
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895 if (addr_3 < the_end) { |
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896 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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897 if (b_start_3 != p) { |
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898 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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899 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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900 addr_3, b_start_3, p); |
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901 *failures = true; |
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902 return; |
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903 } |
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904 } |
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905 |
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906 // Loook up end - 1 |
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907 HeapWord* addr_4 = the_end - 1; |
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908 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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909 if (b_start_4 != p) { |
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910 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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911 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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912 addr_4, b_start_4, p); |
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913 *failures = true; |
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914 return; |
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915 } |
342 | 916 } |
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917 |
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918 if (is_humongous && object_num > 1) { |
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919 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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920 "but has "SIZE_FORMAT", objects", |
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921 bottom(), end(), object_num); |
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922 *failures = true; |
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923 return; |
342 | 924 } |
925 } | |
926 | |
927 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
928 // away eventually. | |
929 | |
356 | 930 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
342 | 931 // false ==> we'll do the clearing if there's clearing to be done. |
356 | 932 ContiguousSpace::initialize(mr, false, mangle_space); |
342 | 933 _offsets.zero_bottom_entry(); |
934 _offsets.initialize_threshold(); | |
356 | 935 if (clear_space) clear(mangle_space); |
342 | 936 } |
937 | |
356 | 938 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
939 ContiguousSpace::clear(mangle_space); | |
342 | 940 _offsets.zero_bottom_entry(); |
941 _offsets.initialize_threshold(); | |
942 } | |
943 | |
944 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
945 Space::set_bottom(new_bottom); | |
946 _offsets.set_bottom(new_bottom); | |
947 } | |
948 | |
949 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
950 Space::set_end(new_end); | |
951 _offsets.resize(new_end - bottom()); | |
952 } | |
953 | |
954 void G1OffsetTableContigSpace::print() const { | |
955 print_short(); | |
956 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
957 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
958 bottom(), top(), _offsets.threshold(), end()); | |
959 } | |
960 | |
961 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
962 return _offsets.initialize_threshold(); | |
963 } | |
964 | |
965 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
966 HeapWord* end) { | |
967 _offsets.alloc_block(start, end); | |
968 return _offsets.threshold(); | |
969 } | |
970 | |
971 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
972 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
973 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
974 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
975 return top(); | |
976 else | |
977 return ContiguousSpace::saved_mark_word(); | |
978 } | |
979 | |
980 void G1OffsetTableContigSpace::set_saved_mark() { | |
981 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
982 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
983 | |
984 if (_gc_time_stamp < curr_gc_time_stamp) { | |
985 // The order of these is important, as another thread might be | |
986 // about to start scanning this region. If it does so after | |
987 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
988 // will be false, and it will pick up top() as the high water mark | |
989 // of region. If it does so after _gc_time_stamp = ..., then it | |
990 // will pick up the right saved_mark_word() as the high water mark | |
991 // of the region. Either way, the behaviour will be correct. | |
992 ContiguousSpace::set_saved_mark(); | |
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993 OrderAccess::storestore(); |
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994 _gc_time_stamp = curr_gc_time_stamp; |
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995 // The following fence is to force a flush of the writes above, but |
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996 // is strictly not needed because when an allocating worker thread |
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997 // calls set_saved_mark() it does so under the ParGCRareEvent_lock; |
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998 // when the lock is released, the write will be flushed. |
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999 // OrderAccess::fence(); |
342 | 1000 } |
1001 } | |
1002 | |
1003 G1OffsetTableContigSpace:: | |
1004 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
1005 MemRegion mr, bool is_zeroed) : | |
1006 _offsets(sharedOffsetArray, mr), | |
1007 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
1008 _gc_time_stamp(0) | |
1009 { | |
1010 _offsets.set_space(this); | |
356 | 1011 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
342 | 1012 } |
1013 | |
1014 size_t RegionList::length() { | |
1015 size_t len = 0; | |
1016 HeapRegion* cur = hd(); | |
1017 DEBUG_ONLY(HeapRegion* last = NULL); | |
1018 while (cur != NULL) { | |
1019 len++; | |
1020 DEBUG_ONLY(last = cur); | |
1021 cur = get_next(cur); | |
1022 } | |
1023 assert(last == tl(), "Invariant"); | |
1024 return len; | |
1025 } | |
1026 | |
1027 void RegionList::insert_before_head(HeapRegion* r) { | |
1028 assert(well_formed(), "Inv"); | |
1029 set_next(r, hd()); | |
1030 _hd = r; | |
1031 _sz++; | |
1032 if (tl() == NULL) _tl = r; | |
1033 assert(well_formed(), "Inv"); | |
1034 } | |
1035 | |
1036 void RegionList::prepend_list(RegionList* new_list) { | |
1037 assert(well_formed(), "Precondition"); | |
1038 assert(new_list->well_formed(), "Precondition"); | |
1039 HeapRegion* new_tl = new_list->tl(); | |
1040 if (new_tl != NULL) { | |
1041 set_next(new_tl, hd()); | |
1042 _hd = new_list->hd(); | |
1043 _sz += new_list->sz(); | |
1044 if (tl() == NULL) _tl = new_list->tl(); | |
1045 } else { | |
1046 assert(new_list->hd() == NULL && new_list->sz() == 0, "Inv"); | |
1047 } | |
1048 assert(well_formed(), "Inv"); | |
1049 } | |
1050 | |
1051 void RegionList::delete_after(HeapRegion* r) { | |
1052 assert(well_formed(), "Precondition"); | |
1053 HeapRegion* next = get_next(r); | |
1054 assert(r != NULL, "Precondition"); | |
1055 HeapRegion* next_tl = get_next(next); | |
1056 set_next(r, next_tl); | |
1057 dec_sz(); | |
1058 if (next == tl()) { | |
1059 assert(next_tl == NULL, "Inv"); | |
1060 _tl = r; | |
1061 } | |
1062 assert(well_formed(), "Inv"); | |
1063 } | |
1064 | |
1065 HeapRegion* RegionList::pop() { | |
1066 assert(well_formed(), "Inv"); | |
1067 HeapRegion* res = hd(); | |
1068 if (res != NULL) { | |
1069 _hd = get_next(res); | |
1070 _sz--; | |
1071 set_next(res, NULL); | |
1072 if (sz() == 0) _tl = NULL; | |
1073 } | |
1074 assert(well_formed(), "Inv"); | |
1075 return res; | |
1076 } |