Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 1836:894b1d7c7e01
6423256: GC stacks should use a better data structure
6942771: SEGV in ParScanThreadState::take_from_overflow_stack
Reviewed-by: apetrusenko, ysr, pbk
author | jcoomes |
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date | Tue, 28 Sep 2010 15:56:15 -0700 |
parents | bb847e31b836 |
children | 72a161e62cc4 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_heapRegion.cpp.incl" | |
27 | |
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28 int HeapRegion::LogOfHRGrainBytes = 0; |
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29 int HeapRegion::LogOfHRGrainWords = 0; |
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30 int HeapRegion::GrainBytes = 0; |
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31 int HeapRegion::GrainWords = 0; |
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32 int HeapRegion::CardsPerRegion = 0; |
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33 |
342 | 34 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
35 HeapRegion* hr, OopClosure* cl, | |
36 CardTableModRefBS::PrecisionStyle precision, | |
37 FilterKind fk) : | |
38 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
39 _hr(hr), _fk(fk), _g1(g1) | |
40 {} | |
41 | |
42 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
43 OopClosure* oc) : | |
44 _r_bottom(r->bottom()), _r_end(r->end()), | |
45 _oc(oc), _out_of_region(0) | |
46 {} | |
47 | |
48 class VerifyLiveClosure: public OopClosure { | |
811 | 49 private: |
342 | 50 G1CollectedHeap* _g1h; |
51 CardTableModRefBS* _bs; | |
52 oop _containing_obj; | |
53 bool _failures; | |
54 int _n_failures; | |
811 | 55 bool _use_prev_marking; |
342 | 56 public: |
811 | 57 // use_prev_marking == true -> use "prev" marking information, |
58 // use_prev_marking == false -> use "next" marking information | |
59 VerifyLiveClosure(G1CollectedHeap* g1h, bool use_prev_marking) : | |
342 | 60 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
811 | 61 _failures(false), _n_failures(0), _use_prev_marking(use_prev_marking) |
342 | 62 { |
63 BarrierSet* bs = _g1h->barrier_set(); | |
64 if (bs->is_a(BarrierSet::CardTableModRef)) | |
65 _bs = (CardTableModRefBS*)bs; | |
66 } | |
67 | |
68 void set_containing_obj(oop obj) { | |
69 _containing_obj = obj; | |
70 } | |
71 | |
72 bool failures() { return _failures; } | |
73 int n_failures() { return _n_failures; } | |
74 | |
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75 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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76 virtual void do_oop( oop* p) { do_oop_work(p); } |
342 | 77 |
1388 | 78 void print_object(outputStream* out, oop obj) { |
79 #ifdef PRODUCT | |
80 klassOop k = obj->klass(); | |
81 const char* class_name = instanceKlass::cast(k)->external_name(); | |
82 out->print_cr("class name %s", class_name); | |
83 #else // PRODUCT | |
84 obj->print_on(out); | |
85 #endif // PRODUCT | |
86 } | |
87 | |
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88 template <class T> void do_oop_work(T* p) { |
342 | 89 assert(_containing_obj != NULL, "Precondition"); |
811 | 90 assert(!_g1h->is_obj_dead_cond(_containing_obj, _use_prev_marking), |
91 "Precondition"); | |
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92 T heap_oop = oopDesc::load_heap_oop(p); |
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93 if (!oopDesc::is_null(heap_oop)) { |
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94 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 95 bool failed = false; |
811 | 96 if (!_g1h->is_in_closed_subset(obj) || |
97 _g1h->is_obj_dead_cond(obj, _use_prev_marking)) { | |
342 | 98 if (!_failures) { |
99 gclog_or_tty->print_cr(""); | |
100 gclog_or_tty->print_cr("----------"); | |
101 } | |
102 if (!_g1h->is_in_closed_subset(obj)) { | |
1388 | 103 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
342 | 104 gclog_or_tty->print_cr("Field "PTR_FORMAT |
1388 | 105 " of live obj "PTR_FORMAT" in region " |
106 "["PTR_FORMAT", "PTR_FORMAT")", | |
107 p, (void*) _containing_obj, | |
108 from->bottom(), from->end()); | |
109 print_object(gclog_or_tty, _containing_obj); | |
110 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
111 (void*) obj); | |
112 } else { | |
113 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
114 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
115 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
116 " of live obj "PTR_FORMAT" in region " | |
117 "["PTR_FORMAT", "PTR_FORMAT")", | |
118 p, (void*) _containing_obj, | |
119 from->bottom(), from->end()); | |
120 print_object(gclog_or_tty, _containing_obj); | |
121 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
122 "["PTR_FORMAT", "PTR_FORMAT")", | |
123 (void*) obj, to->bottom(), to->end()); | |
124 print_object(gclog_or_tty, obj); | |
342 | 125 } |
126 gclog_or_tty->print_cr("----------"); | |
127 _failures = true; | |
128 failed = true; | |
129 _n_failures++; | |
130 } | |
131 | |
132 if (!_g1h->full_collection()) { | |
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133 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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134 HeapRegion* to = _g1h->heap_region_containing(obj); |
342 | 135 if (from != NULL && to != NULL && |
136 from != to && | |
137 !to->isHumongous()) { | |
138 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
139 jbyte cv_field = *_bs->byte_for_const(p); | |
140 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
141 | |
142 bool is_bad = !(from->is_young() | |
143 || to->rem_set()->contains_reference(p) | |
144 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
145 (_containing_obj->is_objArray() ? | |
146 cv_field == dirty | |
147 : cv_obj == dirty || cv_field == dirty)); | |
148 if (is_bad) { | |
149 if (!_failures) { | |
150 gclog_or_tty->print_cr(""); | |
151 gclog_or_tty->print_cr("----------"); | |
152 } | |
153 gclog_or_tty->print_cr("Missing rem set entry:"); | |
154 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
155 " of obj "PTR_FORMAT | |
156 ", in region %d ["PTR_FORMAT | |
157 ", "PTR_FORMAT"),", | |
158 p, (void*) _containing_obj, | |
159 from->hrs_index(), | |
160 from->bottom(), | |
161 from->end()); | |
162 _containing_obj->print_on(gclog_or_tty); | |
163 gclog_or_tty->print_cr("points to obj "PTR_FORMAT | |
164 " in region %d ["PTR_FORMAT | |
165 ", "PTR_FORMAT").", | |
166 (void*) obj, to->hrs_index(), | |
167 to->bottom(), to->end()); | |
168 obj->print_on(gclog_or_tty); | |
169 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
170 cv_obj, cv_field); | |
171 gclog_or_tty->print_cr("----------"); | |
172 _failures = true; | |
173 if (!failed) _n_failures++; | |
174 } | |
175 } | |
176 } | |
177 } | |
178 } | |
179 }; | |
180 | |
181 template<class ClosureType> | |
182 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
183 HeapRegion* hr, | |
184 HeapWord* cur, HeapWord* top) { | |
185 oop cur_oop = oop(cur); | |
186 int oop_size = cur_oop->size(); | |
187 HeapWord* next_obj = cur + oop_size; | |
188 while (next_obj < top) { | |
189 // Keep filtering the remembered set. | |
190 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
191 // Bottom lies entirely below top, so we can call the | |
192 // non-memRegion version of oop_iterate below. | |
193 cur_oop->oop_iterate(cl); | |
194 } | |
195 cur = next_obj; | |
196 cur_oop = oop(cur); | |
197 oop_size = cur_oop->size(); | |
198 next_obj = cur + oop_size; | |
199 } | |
200 return cur; | |
201 } | |
202 | |
203 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
204 HeapWord* bottom, | |
205 HeapWord* top, | |
206 OopClosure* cl) { | |
207 G1CollectedHeap* g1h = _g1; | |
208 | |
209 int oop_size; | |
210 | |
211 OopClosure* cl2 = cl; | |
212 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
213 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
214 switch (_fk) { | |
215 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
216 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
217 } | |
218 | |
219 // Start filtering what we add to the remembered set. If the object is | |
220 // not considered dead, either because it is marked (in the mark bitmap) | |
221 // or it was allocated after marking finished, then we add it. Otherwise | |
222 // we can safely ignore the object. | |
223 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
224 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
225 } else { | |
226 oop_size = oop(bottom)->size(); | |
227 } | |
228 | |
229 bottom += oop_size; | |
230 | |
231 if (bottom < top) { | |
232 // We replicate the loop below for several kinds of possible filters. | |
233 switch (_fk) { | |
234 case NoFilterKind: | |
235 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
236 break; | |
237 case IntoCSFilterKind: { | |
238 FilterIntoCSClosure filt(this, g1h, cl); | |
239 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
240 break; | |
241 } | |
242 case OutOfRegionFilterKind: { | |
243 FilterOutOfRegionClosure filt(_hr, cl); | |
244 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
245 break; | |
246 } | |
247 default: | |
248 ShouldNotReachHere(); | |
249 } | |
250 | |
251 // Last object. Need to do dead-obj filtering here too. | |
252 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
253 oop(bottom)->oop_iterate(cl2, mr); | |
254 } | |
255 } | |
256 } | |
257 | |
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258 // Minimum region size; we won't go lower than that. |
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259 // We might want to decrease this in the future, to deal with small |
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260 // heaps a bit more efficiently. |
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261 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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262 |
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263 // Maximum region size; we don't go higher than that. There's a good |
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264 // reason for having an upper bound. We don't want regions to get too |
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265 // large, otherwise cleanup's effectiveness would decrease as there |
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266 // will be fewer opportunities to find totally empty regions after |
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267 // marking. |
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268 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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269 |
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270 // The automatic region size calculation will try to have around this |
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271 // many regions in the heap (based on the min heap size). |
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272 #define TARGET_REGION_NUMBER 2048 |
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273 |
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274 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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275 // region_size in bytes |
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276 uintx region_size = G1HeapRegionSize; |
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277 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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278 // We base the automatic calculation on the min heap size. This |
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279 // can be problematic if the spread between min and max is quite |
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280 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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281 // the max size, the region size might be way too large for the |
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282 // min size. Either way, some users might have to set the region |
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283 // size manually for some -Xms / -Xmx combos. |
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284 |
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285 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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286 (uintx) MIN_REGION_SIZE); |
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287 } |
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288 |
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289 int region_size_log = log2_long((jlong) region_size); |
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290 // Recalculate the region size to make sure it's a power of |
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291 // 2. This means that region_size is the largest power of 2 that's |
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292 // <= what we've calculated so far. |
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293 region_size = ((uintx)1 << region_size_log); |
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294 |
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295 // Now make sure that we don't go over or under our limits. |
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296 if (region_size < MIN_REGION_SIZE) { |
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297 region_size = MIN_REGION_SIZE; |
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298 } else if (region_size > MAX_REGION_SIZE) { |
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299 region_size = MAX_REGION_SIZE; |
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300 } |
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301 |
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302 // And recalculate the log. |
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303 region_size_log = log2_long((jlong) region_size); |
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304 |
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305 // Now, set up the globals. |
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306 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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307 LogOfHRGrainBytes = region_size_log; |
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308 |
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309 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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310 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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311 |
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312 guarantee(GrainBytes == 0, "we should only set it once"); |
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313 // The cast to int is safe, given that we've bounded region_size by |
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314 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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315 GrainBytes = (int) region_size; |
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316 |
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317 guarantee(GrainWords == 0, "we should only set it once"); |
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318 GrainWords = GrainBytes >> LogHeapWordSize; |
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319 guarantee(1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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320 |
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321 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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322 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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323 } |
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324 |
342 | 325 void HeapRegion::reset_after_compaction() { |
326 G1OffsetTableContigSpace::reset_after_compaction(); | |
327 // After a compaction the mark bitmap is invalid, so we must | |
328 // treat all objects as being inside the unmarked area. | |
329 zero_marked_bytes(); | |
330 init_top_at_mark_start(); | |
331 } | |
332 | |
333 DirtyCardToOopClosure* | |
334 HeapRegion::new_dcto_closure(OopClosure* cl, | |
335 CardTableModRefBS::PrecisionStyle precision, | |
336 HeapRegionDCTOC::FilterKind fk) { | |
337 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
338 this, cl, precision, fk); | |
339 } | |
340 | |
341 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
355 | 342 _humongous_type = NotHumongous; |
342 | 343 _humongous_start_region = NULL; |
344 _in_collection_set = false; | |
345 _is_gc_alloc_region = false; | |
346 | |
347 // Age stuff (if parallel, this will be done separately, since it needs | |
348 // to be sequential). | |
349 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
350 | |
351 set_young_index_in_cset(-1); | |
352 uninstall_surv_rate_group(); | |
353 set_young_type(NotYoung); | |
354 | |
355 // In case it had been the start of a humongous sequence, reset its end. | |
356 set_end(_orig_end); | |
357 | |
358 if (!par) { | |
359 // If this is parallel, this will be done later. | |
360 HeapRegionRemSet* hrrs = rem_set(); | |
361 if (hrrs != NULL) hrrs->clear(); | |
355 | 362 _claimed = InitialClaimValue; |
342 | 363 } |
364 zero_marked_bytes(); | |
365 set_sort_index(-1); | |
366 | |
367 _offsets.resize(HeapRegion::GrainWords); | |
368 init_top_at_mark_start(); | |
356 | 369 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 370 } |
371 | |
372 // <PREDICTION> | |
373 void HeapRegion::calc_gc_efficiency() { | |
374 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
375 _gc_efficiency = (double) garbage_bytes() / | |
376 g1h->predict_region_elapsed_time_ms(this, false); | |
377 } | |
378 // </PREDICTION> | |
379 | |
380 void HeapRegion::set_startsHumongous() { | |
355 | 381 _humongous_type = StartsHumongous; |
342 | 382 _humongous_start_region = this; |
383 assert(end() == _orig_end, "Should be normal before alloc."); | |
384 } | |
385 | |
386 bool HeapRegion::claimHeapRegion(jint claimValue) { | |
387 jint current = _claimed; | |
388 if (current != claimValue) { | |
389 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
390 if (res == current) { | |
391 return true; | |
392 } | |
393 } | |
394 return false; | |
395 } | |
396 | |
397 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
398 HeapWord* low = addr; | |
399 HeapWord* high = end(); | |
400 while (low < high) { | |
401 size_t diff = pointer_delta(high, low); | |
402 // Must add one below to bias toward the high amount. Otherwise, if | |
403 // "high" were at the desired value, and "low" were one less, we | |
404 // would not converge on "high". This is not symmetric, because | |
405 // we set "high" to a block start, which might be the right one, | |
406 // which we don't do for "low". | |
407 HeapWord* middle = low + (diff+1)/2; | |
408 if (middle == high) return high; | |
409 HeapWord* mid_bs = block_start_careful(middle); | |
410 if (mid_bs < addr) { | |
411 low = middle; | |
412 } else { | |
413 high = mid_bs; | |
414 } | |
415 } | |
416 assert(low == high && low >= addr, "Didn't work."); | |
417 return low; | |
418 } | |
419 | |
420 void HeapRegion::set_next_on_unclean_list(HeapRegion* r) { | |
421 assert(r == NULL || r->is_on_unclean_list(), "Malformed unclean list."); | |
422 _next_in_special_set = r; | |
423 } | |
424 | |
425 void HeapRegion::set_on_unclean_list(bool b) { | |
426 _is_on_unclean_list = b; | |
427 } | |
428 | |
356 | 429 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
430 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
342 | 431 hr_clear(false/*par*/, clear_space); |
432 } | |
433 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
434 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
435 #endif // _MSC_VER | |
436 | |
437 | |
438 HeapRegion:: | |
439 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
440 MemRegion mr, bool is_zeroed) | |
441 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), | |
442 _next_fk(HeapRegionDCTOC::NoFilterKind), | |
443 _hrs_index(-1), | |
355 | 444 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
342 | 445 _in_collection_set(false), _is_gc_alloc_region(false), |
446 _is_on_free_list(false), _is_on_unclean_list(false), | |
447 _next_in_special_set(NULL), _orig_end(NULL), | |
355 | 448 _claimed(InitialClaimValue), _evacuation_failed(false), |
342 | 449 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
450 _young_type(NotYoung), _next_young_region(NULL), | |
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451 _next_dirty_cards_region(NULL), |
342 | 452 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), |
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453 _rem_set(NULL), _zfs(NotZeroFilled), |
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454 _recorded_rs_length(0), _predicted_elapsed_time_ms(0), |
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455 _predicted_bytes_to_copy(0) |
342 | 456 { |
457 _orig_end = mr.end(); | |
458 // Note that initialize() will set the start of the unmarked area of the | |
459 // region. | |
356 | 460 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
461 set_top(bottom()); | |
462 set_saved_mark(); | |
342 | 463 |
464 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
465 | |
466 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
467 // In case the region is allocated during a pause, note the top. | |
468 // We haven't done any counting on a brand new region. | |
469 _top_at_conc_mark_count = bottom(); | |
470 } | |
471 | |
472 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
473 const HeapRegion* _target; | |
474 bool _target_seen; | |
475 HeapRegion* _last; | |
476 CompactibleSpace* _res; | |
477 public: | |
478 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
479 _target(target), _target_seen(false), _res(NULL) {} | |
480 bool doHeapRegion(HeapRegion* cur) { | |
481 if (_target_seen) { | |
482 if (!cur->isHumongous()) { | |
483 _res = cur; | |
484 return true; | |
485 } | |
486 } else if (cur == _target) { | |
487 _target_seen = true; | |
488 } | |
489 return false; | |
490 } | |
491 CompactibleSpace* result() { return _res; } | |
492 }; | |
493 | |
494 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
495 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
496 // cast away const-ness | |
497 HeapRegion* r = (HeapRegion*) this; | |
498 NextCompactionHeapRegionClosure blk(r); | |
499 g1h->heap_region_iterate_from(r, &blk); | |
500 return blk.result(); | |
501 } | |
502 | |
503 void HeapRegion::set_continuesHumongous(HeapRegion* start) { | |
504 // The order is important here. | |
505 start->add_continuingHumongousRegion(this); | |
355 | 506 _humongous_type = ContinuesHumongous; |
342 | 507 _humongous_start_region = start; |
508 } | |
509 | |
510 void HeapRegion::add_continuingHumongousRegion(HeapRegion* cont) { | |
511 // Must join the blocks of the current H region seq with the block of the | |
512 // added region. | |
513 offsets()->join_blocks(bottom(), cont->bottom()); | |
514 arrayOop obj = (arrayOop)(bottom()); | |
515 obj->set_length((int) (obj->length() + cont->capacity()/jintSize)); | |
516 set_end(cont->end()); | |
517 set_top(cont->end()); | |
518 } | |
519 | |
520 void HeapRegion::save_marks() { | |
521 set_saved_mark(); | |
522 } | |
523 | |
524 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
525 HeapWord* p = mr.start(); | |
526 HeapWord* e = mr.end(); | |
527 oop obj; | |
528 while (p < e) { | |
529 obj = oop(p); | |
530 p += obj->oop_iterate(cl); | |
531 } | |
532 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
533 } | |
534 | |
535 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
536 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
537 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
538 } | |
539 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
540 | |
541 | |
542 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
543 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
544 } | |
545 | |
546 #ifdef DEBUG | |
547 HeapWord* HeapRegion::allocate(size_t size) { | |
548 jint state = zero_fill_state(); | |
549 assert(!G1CollectedHeap::heap()->allocs_are_zero_filled() || | |
550 zero_fill_is_allocated(), | |
551 "When ZF is on, only alloc in ZF'd regions"); | |
552 return G1OffsetTableContigSpace::allocate(size); | |
553 } | |
554 #endif | |
555 | |
556 void HeapRegion::set_zero_fill_state_work(ZeroFillState zfs) { | |
557 assert(ZF_mon->owned_by_self() || | |
558 Universe::heap()->is_gc_active(), | |
559 "Must hold the lock or be a full GC to modify."); | |
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560 #ifdef ASSERT |
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561 if (top() != bottom() && zfs != Allocated) { |
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562 ResourceMark rm; |
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563 stringStream region_str; |
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564 print_on(®ion_str); |
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565 assert(top() == bottom() || zfs == Allocated, |
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566 err_msg("Region must be empty, or we must be setting it to allocated. " |
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567 "_zfs=%d, zfs=%d, region: %s", _zfs, zfs, region_str.as_string())); |
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568 } |
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569 #endif |
342 | 570 _zfs = zfs; |
571 } | |
572 | |
573 void HeapRegion::set_zero_fill_complete() { | |
574 set_zero_fill_state_work(ZeroFilled); | |
575 if (ZF_mon->owned_by_self()) { | |
576 ZF_mon->notify_all(); | |
577 } | |
578 } | |
579 | |
580 | |
581 void HeapRegion::ensure_zero_filled() { | |
582 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
583 ensure_zero_filled_locked(); | |
584 } | |
585 | |
586 void HeapRegion::ensure_zero_filled_locked() { | |
587 assert(ZF_mon->owned_by_self(), "Precondition"); | |
588 bool should_ignore_zf = SafepointSynchronize::is_at_safepoint(); | |
589 assert(should_ignore_zf || Heap_lock->is_locked(), | |
590 "Either we're in a GC or we're allocating a region."); | |
591 switch (zero_fill_state()) { | |
592 case HeapRegion::NotZeroFilled: | |
593 set_zero_fill_in_progress(Thread::current()); | |
594 { | |
595 ZF_mon->unlock(); | |
596 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
597 ZF_mon->lock_without_safepoint_check(); | |
598 } | |
599 // A trap. | |
600 guarantee(zero_fill_state() == HeapRegion::ZeroFilling | |
601 && zero_filler() == Thread::current(), | |
602 "AHA! Tell Dave D if you see this..."); | |
603 set_zero_fill_complete(); | |
604 // gclog_or_tty->print_cr("Did sync ZF."); | |
605 ConcurrentZFThread::note_sync_zfs(); | |
606 break; | |
607 case HeapRegion::ZeroFilling: | |
608 if (should_ignore_zf) { | |
609 // We can "break" the lock and take over the work. | |
610 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
611 set_zero_fill_complete(); | |
612 ConcurrentZFThread::note_sync_zfs(); | |
613 break; | |
614 } else { | |
615 ConcurrentZFThread::wait_for_ZF_completed(this); | |
616 } | |
617 case HeapRegion::ZeroFilled: | |
618 // Nothing to do. | |
619 break; | |
620 case HeapRegion::Allocated: | |
621 guarantee(false, "Should not call on allocated regions."); | |
622 } | |
623 assert(zero_fill_state() == HeapRegion::ZeroFilled, "Post"); | |
624 } | |
625 | |
626 HeapWord* | |
627 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
628 ObjectClosure* cl) { | |
629 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
630 // We used to use "block_start_careful" here. But we're actually happy | |
631 // to update the BOT while we do this... | |
632 HeapWord* cur = block_start(mr.start()); | |
633 mr = mr.intersection(used_region()); | |
634 if (mr.is_empty()) return NULL; | |
635 // Otherwise, find the obj that extends onto mr.start(). | |
636 | |
637 assert(cur <= mr.start() | |
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638 && (oop(cur)->klass_or_null() == NULL || |
342 | 639 cur + oop(cur)->size() > mr.start()), |
640 "postcondition of block_start"); | |
641 oop obj; | |
642 while (cur < mr.end()) { | |
643 obj = oop(cur); | |
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644 if (obj->klass_or_null() == NULL) { |
342 | 645 // Ran into an unparseable point. |
646 return cur; | |
647 } else if (!g1h->is_obj_dead(obj)) { | |
648 cl->do_object(obj); | |
649 } | |
650 if (cl->abort()) return cur; | |
651 // The check above must occur before the operation below, since an | |
652 // abort might invalidate the "size" operation. | |
653 cur += obj->size(); | |
654 } | |
655 return NULL; | |
656 } | |
657 | |
658 HeapWord* | |
659 HeapRegion:: | |
660 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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661 FilterOutOfRegionClosure* cl, |
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662 bool filter_young) { |
342 | 663 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
664 | |
665 // If we're within a stop-world GC, then we might look at a card in a | |
666 // GC alloc region that extends onto a GC LAB, which may not be | |
667 // parseable. Stop such at the "saved_mark" of the region. | |
668 if (G1CollectedHeap::heap()->is_gc_active()) { | |
669 mr = mr.intersection(used_region_at_save_marks()); | |
670 } else { | |
671 mr = mr.intersection(used_region()); | |
672 } | |
673 if (mr.is_empty()) return NULL; | |
674 // Otherwise, find the obj that extends onto mr.start(). | |
675 | |
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676 // The intersection of the incoming mr (for the card) and the |
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677 // allocated part of the region is non-empty. This implies that |
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678 // we have actually allocated into this region. The code in |
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679 // G1CollectedHeap.cpp that allocates a new region sets the |
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680 // is_young tag on the region before allocating. Thus we |
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681 // safely know if this region is young. |
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682 if (is_young() && filter_young) { |
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683 return NULL; |
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684 } |
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685 |
1705 | 686 assert(!is_young(), "check value of filter_young"); |
687 | |
342 | 688 // We used to use "block_start_careful" here. But we're actually happy |
689 // to update the BOT while we do this... | |
690 HeapWord* cur = block_start(mr.start()); | |
691 assert(cur <= mr.start(), "Postcondition"); | |
692 | |
693 while (cur <= mr.start()) { | |
845
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694 if (oop(cur)->klass_or_null() == NULL) { |
342 | 695 // Ran into an unparseable point. |
696 return cur; | |
697 } | |
698 // Otherwise... | |
699 int sz = oop(cur)->size(); | |
700 if (cur + sz > mr.start()) break; | |
701 // Otherwise, go on. | |
702 cur = cur + sz; | |
703 } | |
704 oop obj; | |
705 obj = oop(cur); | |
706 // If we finish this loop... | |
707 assert(cur <= mr.start() | |
845
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708 && obj->klass_or_null() != NULL |
342 | 709 && cur + obj->size() > mr.start(), |
710 "Loop postcondition"); | |
711 if (!g1h->is_obj_dead(obj)) { | |
712 obj->oop_iterate(cl, mr); | |
713 } | |
714 | |
715 HeapWord* next; | |
716 while (cur < mr.end()) { | |
717 obj = oop(cur); | |
845
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718 if (obj->klass_or_null() == NULL) { |
342 | 719 // Ran into an unparseable point. |
720 return cur; | |
721 }; | |
722 // Otherwise: | |
723 next = (cur + obj->size()); | |
724 if (!g1h->is_obj_dead(obj)) { | |
725 if (next < mr.end()) { | |
726 obj->oop_iterate(cl); | |
727 } else { | |
728 // this obj spans the boundary. If it's an array, stop at the | |
729 // boundary. | |
730 if (obj->is_objArray()) { | |
731 obj->oop_iterate(cl, mr); | |
732 } else { | |
733 obj->oop_iterate(cl); | |
734 } | |
735 } | |
736 } | |
737 cur = next; | |
738 } | |
739 return NULL; | |
740 } | |
741 | |
742 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
743 void HeapRegion::print_on(outputStream* st) const { | |
744 if (isHumongous()) { | |
745 if (startsHumongous()) | |
746 st->print(" HS"); | |
747 else | |
748 st->print(" HC"); | |
749 } else { | |
750 st->print(" "); | |
751 } | |
752 if (in_collection_set()) | |
753 st->print(" CS"); | |
754 else if (is_gc_alloc_region()) | |
755 st->print(" A "); | |
756 else | |
757 st->print(" "); | |
758 if (is_young()) | |
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759 st->print(is_survivor() ? " SU" : " Y "); |
342 | 760 else |
761 st->print(" "); | |
762 if (is_empty()) | |
763 st->print(" F"); | |
764 else | |
765 st->print(" "); | |
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766 st->print(" %5d", _gc_time_stamp); |
1388 | 767 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
768 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 769 G1OffsetTableContigSpace::print_on(st); |
770 } | |
771 | |
811 | 772 void HeapRegion::verify(bool allow_dirty) const { |
1020
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773 bool dummy = false; |
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774 verify(allow_dirty, /* use_prev_marking */ true, /* failures */ &dummy); |
811 | 775 } |
776 | |
342 | 777 #define OBJ_SAMPLE_INTERVAL 0 |
778 #define BLOCK_SAMPLE_INTERVAL 100 | |
779 | |
780 // This really ought to be commoned up into OffsetTableContigSpace somehow. | |
781 // We would need a mechanism to make that code skip dead objects. | |
782 | |
1020
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783 void HeapRegion::verify(bool allow_dirty, |
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784 bool use_prev_marking, |
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785 bool* failures) const { |
342 | 786 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
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787 *failures = false; |
342 | 788 HeapWord* p = bottom(); |
789 HeapWord* prev_p = NULL; | |
790 int objs = 0; | |
791 int blocks = 0; | |
811 | 792 VerifyLiveClosure vl_cl(g1, use_prev_marking); |
1718
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793 bool is_humongous = isHumongous(); |
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794 size_t object_num = 0; |
342 | 795 while (p < top()) { |
796 size_t size = oop(p)->size(); | |
1718
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797 if (is_humongous != g1->isHumongous(size)) { |
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798 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
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799 SIZE_FORMAT" words) in a %shumongous region", |
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800 p, g1->isHumongous(size) ? "" : "non-", |
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801 size, is_humongous ? "" : "non-"); |
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802 *failures = true; |
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|
803 } |
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804 object_num += 1; |
342 | 805 if (blocks == BLOCK_SAMPLE_INTERVAL) { |
1020
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806 HeapWord* res = block_start_const(p + (size/2)); |
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807 if (p != res) { |
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808 gclog_or_tty->print_cr("offset computation 1 for "PTR_FORMAT" and " |
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809 SIZE_FORMAT" returned "PTR_FORMAT, |
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810 p, size, res); |
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811 *failures = true; |
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|
812 return; |
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813 } |
342 | 814 blocks = 0; |
815 } else { | |
816 blocks++; | |
817 } | |
818 if (objs == OBJ_SAMPLE_INTERVAL) { | |
819 oop obj = oop(p); | |
811 | 820 if (!g1->is_obj_dead_cond(obj, this, use_prev_marking)) { |
1020
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821 if (obj->is_oop()) { |
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822 klassOop klass = obj->klass(); |
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823 if (!klass->is_perm()) { |
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824 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
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825 "not in perm", klass, obj); |
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826 *failures = true; |
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|
827 return; |
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|
828 } else if (!klass->is_klass()) { |
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829 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
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830 "not a klass", klass, obj); |
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831 *failures = true; |
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|
832 return; |
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|
833 } else { |
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834 vl_cl.set_containing_obj(obj); |
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|
835 obj->oop_iterate(&vl_cl); |
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|
836 if (vl_cl.failures()) { |
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|
837 *failures = true; |
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|
838 } |
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839 if (G1MaxVerifyFailures >= 0 && |
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changeset
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840 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
841 return; |
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|
842 } |
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|
843 } |
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|
844 } else { |
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|
845 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
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|
846 *failures = true; |
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|
847 return; |
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|
848 } |
342 | 849 } |
850 objs = 0; | |
851 } else { | |
852 objs++; | |
853 } | |
854 prev_p = p; | |
855 p += size; | |
856 } | |
857 HeapWord* rend = end(); | |
858 HeapWord* rtop = top(); | |
859 if (rtop < rend) { | |
1020
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860 HeapWord* res = block_start_const(rtop + (rend - rtop) / 2); |
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861 if (res != rtop) { |
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862 gclog_or_tty->print_cr("offset computation 2 for "PTR_FORMAT" and " |
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863 PTR_FORMAT" returned "PTR_FORMAT, |
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|
864 rtop, rend, res); |
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|
865 *failures = true; |
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|
866 return; |
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|
867 } |
342 | 868 } |
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869 |
1718
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870 if (is_humongous && object_num > 1) { |
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6974928: G1: sometimes humongous objects are allocated in young regions
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871 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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6974928: G1: sometimes humongous objects are allocated in young regions
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872 "but has "SIZE_FORMAT", objects", |
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6974928: G1: sometimes humongous objects are allocated in young regions
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|
873 bottom(), end(), object_num); |
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874 *failures = true; |
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6974928: G1: sometimes humongous objects are allocated in young regions
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|
875 } |
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|
876 |
1020
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877 if (p != top()) { |
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878 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
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879 "does not match top "PTR_FORMAT, p, top()); |
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|
880 *failures = true; |
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881 return; |
342 | 882 } |
883 } | |
884 | |
885 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
886 // away eventually. | |
887 | |
356 | 888 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
342 | 889 // false ==> we'll do the clearing if there's clearing to be done. |
356 | 890 ContiguousSpace::initialize(mr, false, mangle_space); |
342 | 891 _offsets.zero_bottom_entry(); |
892 _offsets.initialize_threshold(); | |
356 | 893 if (clear_space) clear(mangle_space); |
342 | 894 } |
895 | |
356 | 896 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
897 ContiguousSpace::clear(mangle_space); | |
342 | 898 _offsets.zero_bottom_entry(); |
899 _offsets.initialize_threshold(); | |
900 } | |
901 | |
902 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
903 Space::set_bottom(new_bottom); | |
904 _offsets.set_bottom(new_bottom); | |
905 } | |
906 | |
907 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
908 Space::set_end(new_end); | |
909 _offsets.resize(new_end - bottom()); | |
910 } | |
911 | |
912 void G1OffsetTableContigSpace::print() const { | |
913 print_short(); | |
914 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
915 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
916 bottom(), top(), _offsets.threshold(), end()); | |
917 } | |
918 | |
919 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
920 return _offsets.initialize_threshold(); | |
921 } | |
922 | |
923 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
924 HeapWord* end) { | |
925 _offsets.alloc_block(start, end); | |
926 return _offsets.threshold(); | |
927 } | |
928 | |
929 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
930 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
931 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
932 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
933 return top(); | |
934 else | |
935 return ContiguousSpace::saved_mark_word(); | |
936 } | |
937 | |
938 void G1OffsetTableContigSpace::set_saved_mark() { | |
939 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
940 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
941 | |
942 if (_gc_time_stamp < curr_gc_time_stamp) { | |
943 // The order of these is important, as another thread might be | |
944 // about to start scanning this region. If it does so after | |
945 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
946 // will be false, and it will pick up top() as the high water mark | |
947 // of region. If it does so after _gc_time_stamp = ..., then it | |
948 // will pick up the right saved_mark_word() as the high water mark | |
949 // of the region. Either way, the behaviour will be correct. | |
950 ContiguousSpace::set_saved_mark(); | |
845
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951 OrderAccess::storestore(); |
353
9bb2c10ac07b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
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diff
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952 _gc_time_stamp = curr_gc_time_stamp; |
845
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953 // The following fence is to force a flush of the writes above, but |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
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954 // is strictly not needed because when an allocating worker thread |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
955 // calls set_saved_mark() it does so under the ParGCRareEvent_lock; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
956 // when the lock is released, the write will be flushed. |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
957 // OrderAccess::fence(); |
342 | 958 } |
959 } | |
960 | |
961 G1OffsetTableContigSpace:: | |
962 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
963 MemRegion mr, bool is_zeroed) : | |
964 _offsets(sharedOffsetArray, mr), | |
965 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
966 _gc_time_stamp(0) | |
967 { | |
968 _offsets.set_space(this); | |
356 | 969 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
342 | 970 } |
971 | |
972 size_t RegionList::length() { | |
973 size_t len = 0; | |
974 HeapRegion* cur = hd(); | |
975 DEBUG_ONLY(HeapRegion* last = NULL); | |
976 while (cur != NULL) { | |
977 len++; | |
978 DEBUG_ONLY(last = cur); | |
979 cur = get_next(cur); | |
980 } | |
981 assert(last == tl(), "Invariant"); | |
982 return len; | |
983 } | |
984 | |
985 void RegionList::insert_before_head(HeapRegion* r) { | |
986 assert(well_formed(), "Inv"); | |
987 set_next(r, hd()); | |
988 _hd = r; | |
989 _sz++; | |
990 if (tl() == NULL) _tl = r; | |
991 assert(well_formed(), "Inv"); | |
992 } | |
993 | |
994 void RegionList::prepend_list(RegionList* new_list) { | |
995 assert(well_formed(), "Precondition"); | |
996 assert(new_list->well_formed(), "Precondition"); | |
997 HeapRegion* new_tl = new_list->tl(); | |
998 if (new_tl != NULL) { | |
999 set_next(new_tl, hd()); | |
1000 _hd = new_list->hd(); | |
1001 _sz += new_list->sz(); | |
1002 if (tl() == NULL) _tl = new_list->tl(); | |
1003 } else { | |
1004 assert(new_list->hd() == NULL && new_list->sz() == 0, "Inv"); | |
1005 } | |
1006 assert(well_formed(), "Inv"); | |
1007 } | |
1008 | |
1009 void RegionList::delete_after(HeapRegion* r) { | |
1010 assert(well_formed(), "Precondition"); | |
1011 HeapRegion* next = get_next(r); | |
1012 assert(r != NULL, "Precondition"); | |
1013 HeapRegion* next_tl = get_next(next); | |
1014 set_next(r, next_tl); | |
1015 dec_sz(); | |
1016 if (next == tl()) { | |
1017 assert(next_tl == NULL, "Inv"); | |
1018 _tl = r; | |
1019 } | |
1020 assert(well_formed(), "Inv"); | |
1021 } | |
1022 | |
1023 HeapRegion* RegionList::pop() { | |
1024 assert(well_formed(), "Inv"); | |
1025 HeapRegion* res = hd(); | |
1026 if (res != NULL) { | |
1027 _hd = get_next(res); | |
1028 _sz--; | |
1029 set_next(res, NULL); | |
1030 if (sz() == 0) _tl = NULL; | |
1031 } | |
1032 assert(well_formed(), "Inv"); | |
1033 return res; | |
1034 } |