Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 3852:fdb992d83a87
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Reviewed-by: kvn, never, bdelsart
author | twisti |
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date | Tue, 16 Aug 2011 04:14:05 -0700 |
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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/g1BlockOffsetTable.inline.hpp" | |
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
28 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
29 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
30 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
31 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
32 #include "memory/genOopClosures.inline.hpp" | |
33 #include "memory/iterator.hpp" | |
34 #include "oops/oop.inline.hpp" | |
342 | 35 |
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36 int HeapRegion::LogOfHRGrainBytes = 0; |
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37 int HeapRegion::LogOfHRGrainWords = 0; |
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38 int HeapRegion::GrainBytes = 0; |
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39 int HeapRegion::GrainWords = 0; |
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40 int HeapRegion::CardsPerRegion = 0; |
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41 |
342 | 42 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
43 HeapRegion* hr, OopClosure* cl, | |
44 CardTableModRefBS::PrecisionStyle precision, | |
45 FilterKind fk) : | |
46 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
47 _hr(hr), _fk(fk), _g1(g1) | |
48 {} | |
49 | |
50 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
51 OopClosure* oc) : | |
52 _r_bottom(r->bottom()), _r_end(r->end()), | |
53 _oc(oc), _out_of_region(0) | |
54 {} | |
55 | |
56 class VerifyLiveClosure: public OopClosure { | |
811 | 57 private: |
342 | 58 G1CollectedHeap* _g1h; |
59 CardTableModRefBS* _bs; | |
60 oop _containing_obj; | |
61 bool _failures; | |
62 int _n_failures; | |
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63 VerifyOption _vo; |
342 | 64 public: |
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65 // _vo == UsePrevMarking -> use "prev" marking information, |
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66 // _vo == UseNextMarking -> use "next" marking information, |
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67 // _vo == UseMarkWord -> use mark word from object header. |
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68 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : |
342 | 69 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
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70 _failures(false), _n_failures(0), _vo(vo) |
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"); |
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99 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), |
811 | 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) || |
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106 _g1h->is_obj_dead_cond(obj, _vo)) { |
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:"); | |
3766 | 163 gclog_or_tty->print_cr("Field "PTR_FORMAT" " |
164 "of obj "PTR_FORMAT", " | |
165 "in region "HR_FORMAT, | |
166 p, (void*) _containing_obj, | |
167 HR_FORMAT_PARAMS(from)); | |
342 | 168 _containing_obj->print_on(gclog_or_tty); |
3766 | 169 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " |
170 "in region "HR_FORMAT, | |
171 (void*) obj, | |
172 HR_FORMAT_PARAMS(to)); | |
342 | 173 obj->print_on(gclog_or_tty); |
174 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
175 cv_obj, cv_field); | |
176 gclog_or_tty->print_cr("----------"); | |
177 _failures = true; | |
178 if (!failed) _n_failures++; | |
179 } | |
180 } | |
181 } | |
182 } | |
183 } | |
184 }; | |
185 | |
186 template<class ClosureType> | |
187 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
188 HeapRegion* hr, | |
189 HeapWord* cur, HeapWord* top) { | |
190 oop cur_oop = oop(cur); | |
191 int oop_size = cur_oop->size(); | |
192 HeapWord* next_obj = cur + oop_size; | |
193 while (next_obj < top) { | |
194 // Keep filtering the remembered set. | |
195 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
196 // Bottom lies entirely below top, so we can call the | |
197 // non-memRegion version of oop_iterate below. | |
198 cur_oop->oop_iterate(cl); | |
199 } | |
200 cur = next_obj; | |
201 cur_oop = oop(cur); | |
202 oop_size = cur_oop->size(); | |
203 next_obj = cur + oop_size; | |
204 } | |
205 return cur; | |
206 } | |
207 | |
208 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
209 HeapWord* bottom, | |
210 HeapWord* top, | |
211 OopClosure* cl) { | |
212 G1CollectedHeap* g1h = _g1; | |
213 | |
214 int oop_size; | |
215 | |
216 OopClosure* cl2 = cl; | |
217 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
218 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
219 switch (_fk) { | |
220 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
221 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
222 } | |
223 | |
224 // Start filtering what we add to the remembered set. If the object is | |
225 // not considered dead, either because it is marked (in the mark bitmap) | |
226 // or it was allocated after marking finished, then we add it. Otherwise | |
227 // we can safely ignore the object. | |
228 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
229 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
230 } else { | |
231 oop_size = oop(bottom)->size(); | |
232 } | |
233 | |
234 bottom += oop_size; | |
235 | |
236 if (bottom < top) { | |
237 // We replicate the loop below for several kinds of possible filters. | |
238 switch (_fk) { | |
239 case NoFilterKind: | |
240 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
241 break; | |
242 case IntoCSFilterKind: { | |
243 FilterIntoCSClosure filt(this, g1h, cl); | |
244 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
245 break; | |
246 } | |
247 case OutOfRegionFilterKind: { | |
248 FilterOutOfRegionClosure filt(_hr, cl); | |
249 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
250 break; | |
251 } | |
252 default: | |
253 ShouldNotReachHere(); | |
254 } | |
255 | |
256 // Last object. Need to do dead-obj filtering here too. | |
257 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
258 oop(bottom)->oop_iterate(cl2, mr); | |
259 } | |
260 } | |
261 } | |
262 | |
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263 // Minimum region size; we won't go lower than that. |
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264 // We might want to decrease this in the future, to deal with small |
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265 // heaps a bit more efficiently. |
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266 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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267 |
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268 // Maximum region size; we don't go higher than that. There's a good |
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269 // reason for having an upper bound. We don't want regions to get too |
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270 // large, otherwise cleanup's effectiveness would decrease as there |
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271 // will be fewer opportunities to find totally empty regions after |
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272 // marking. |
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273 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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274 |
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275 // The automatic region size calculation will try to have around this |
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276 // many regions in the heap (based on the min heap size). |
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277 #define TARGET_REGION_NUMBER 2048 |
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278 |
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279 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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280 // region_size in bytes |
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281 uintx region_size = G1HeapRegionSize; |
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282 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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283 // We base the automatic calculation on the min heap size. This |
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284 // can be problematic if the spread between min and max is quite |
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285 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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286 // the max size, the region size might be way too large for the |
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287 // min size. Either way, some users might have to set the region |
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288 // size manually for some -Xms / -Xmx combos. |
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289 |
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290 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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291 (uintx) MIN_REGION_SIZE); |
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292 } |
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293 |
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294 int region_size_log = log2_long((jlong) region_size); |
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295 // Recalculate the region size to make sure it's a power of |
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296 // 2. This means that region_size is the largest power of 2 that's |
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297 // <= what we've calculated so far. |
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298 region_size = ((uintx)1 << region_size_log); |
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299 |
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300 // Now make sure that we don't go over or under our limits. |
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301 if (region_size < MIN_REGION_SIZE) { |
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302 region_size = MIN_REGION_SIZE; |
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303 } else if (region_size > MAX_REGION_SIZE) { |
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304 region_size = MAX_REGION_SIZE; |
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305 } |
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306 |
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307 // And recalculate the log. |
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308 region_size_log = log2_long((jlong) region_size); |
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309 |
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310 // Now, set up the globals. |
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311 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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312 LogOfHRGrainBytes = region_size_log; |
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313 |
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314 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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315 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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316 |
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317 guarantee(GrainBytes == 0, "we should only set it once"); |
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318 // The cast to int is safe, given that we've bounded region_size by |
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319 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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320 GrainBytes = (int) region_size; |
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321 |
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322 guarantee(GrainWords == 0, "we should only set it once"); |
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323 GrainWords = GrainBytes >> LogHeapWordSize; |
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324 guarantee(1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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325 |
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326 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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327 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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328 } |
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329 |
342 | 330 void HeapRegion::reset_after_compaction() { |
331 G1OffsetTableContigSpace::reset_after_compaction(); | |
332 // After a compaction the mark bitmap is invalid, so we must | |
333 // treat all objects as being inside the unmarked area. | |
334 zero_marked_bytes(); | |
335 init_top_at_mark_start(); | |
336 } | |
337 | |
338 DirtyCardToOopClosure* | |
339 HeapRegion::new_dcto_closure(OopClosure* cl, | |
340 CardTableModRefBS::PrecisionStyle precision, | |
341 HeapRegionDCTOC::FilterKind fk) { | |
342 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
343 this, cl, precision, fk); | |
344 } | |
345 | |
346 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
2152 | 347 assert(_humongous_type == NotHumongous, |
348 "we should have already filtered out humongous regions"); | |
349 assert(_humongous_start_region == NULL, | |
350 "we should have already filtered out humongous regions"); | |
351 assert(_end == _orig_end, | |
352 "we should have already filtered out humongous regions"); | |
353 | |
342 | 354 _in_collection_set = false; |
355 _is_gc_alloc_region = false; | |
356 | |
357 set_young_index_in_cset(-1); | |
358 uninstall_surv_rate_group(); | |
359 set_young_type(NotYoung); | |
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360 reset_pre_dummy_top(); |
342 | 361 |
362 if (!par) { | |
363 // If this is parallel, this will be done later. | |
364 HeapRegionRemSet* hrrs = rem_set(); | |
365 if (hrrs != NULL) hrrs->clear(); | |
355 | 366 _claimed = InitialClaimValue; |
342 | 367 } |
368 zero_marked_bytes(); | |
369 set_sort_index(-1); | |
370 | |
371 _offsets.resize(HeapRegion::GrainWords); | |
372 init_top_at_mark_start(); | |
356 | 373 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 374 } |
375 | |
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376 void HeapRegion::par_clear() { |
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377 assert(used() == 0, "the region should have been already cleared"); |
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378 assert(capacity() == (size_t) HeapRegion::GrainBytes, |
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379 "should be back to normal"); |
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380 HeapRegionRemSet* hrrs = rem_set(); |
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381 hrrs->clear(); |
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382 CardTableModRefBS* ct_bs = |
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383 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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384 ct_bs->clear(MemRegion(bottom(), end())); |
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385 } |
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386 |
342 | 387 // <PREDICTION> |
388 void HeapRegion::calc_gc_efficiency() { | |
389 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
390 _gc_efficiency = (double) garbage_bytes() / | |
391 g1h->predict_region_elapsed_time_ms(this, false); | |
392 } | |
393 // </PREDICTION> | |
394 | |
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395 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 396 assert(!isHumongous(), "sanity / pre-condition"); |
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397 assert(end() == _orig_end, |
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398 "Should be normal before the humongous object allocation"); |
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399 assert(top() == bottom(), "should be empty"); |
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400 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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401 |
355 | 402 _humongous_type = StartsHumongous; |
342 | 403 _humongous_start_region = this; |
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404 |
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405 set_end(new_end); |
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406 _offsets.set_for_starts_humongous(new_top); |
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407 } |
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408 |
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409 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 410 assert(!isHumongous(), "sanity / pre-condition"); |
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411 assert(end() == _orig_end, |
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412 "Should be normal before the humongous object allocation"); |
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413 assert(top() == bottom(), "should be empty"); |
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414 assert(first_hr->startsHumongous(), "pre-condition"); |
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415 |
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416 _humongous_type = ContinuesHumongous; |
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417 _humongous_start_region = first_hr; |
342 | 418 } |
419 | |
2152 | 420 void HeapRegion::set_notHumongous() { |
421 assert(isHumongous(), "pre-condition"); | |
422 | |
423 if (startsHumongous()) { | |
424 assert(top() <= end(), "pre-condition"); | |
425 set_end(_orig_end); | |
426 if (top() > end()) { | |
427 // at least one "continues humongous" region after it | |
428 set_top(end()); | |
429 } | |
430 } else { | |
431 // continues humongous | |
432 assert(end() == _orig_end, "sanity"); | |
433 } | |
434 | |
435 assert(capacity() == (size_t) HeapRegion::GrainBytes, "pre-condition"); | |
436 _humongous_type = NotHumongous; | |
437 _humongous_start_region = NULL; | |
438 } | |
439 | |
342 | 440 bool HeapRegion::claimHeapRegion(jint claimValue) { |
441 jint current = _claimed; | |
442 if (current != claimValue) { | |
443 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
444 if (res == current) { | |
445 return true; | |
446 } | |
447 } | |
448 return false; | |
449 } | |
450 | |
451 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
452 HeapWord* low = addr; | |
453 HeapWord* high = end(); | |
454 while (low < high) { | |
455 size_t diff = pointer_delta(high, low); | |
456 // Must add one below to bias toward the high amount. Otherwise, if | |
457 // "high" were at the desired value, and "low" were one less, we | |
458 // would not converge on "high". This is not symmetric, because | |
459 // we set "high" to a block start, which might be the right one, | |
460 // which we don't do for "low". | |
461 HeapWord* middle = low + (diff+1)/2; | |
462 if (middle == high) return high; | |
463 HeapWord* mid_bs = block_start_careful(middle); | |
464 if (mid_bs < addr) { | |
465 low = middle; | |
466 } else { | |
467 high = mid_bs; | |
468 } | |
469 } | |
470 assert(low == high && low >= addr, "Didn't work."); | |
471 return low; | |
472 } | |
473 | |
356 | 474 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
475 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
342 | 476 hr_clear(false/*par*/, clear_space); |
477 } | |
478 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
479 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
480 #endif // _MSC_VER | |
481 | |
482 | |
483 HeapRegion:: | |
3766 | 484 HeapRegion(size_t hrs_index, G1BlockOffsetSharedArray* sharedOffsetArray, |
485 MemRegion mr, bool is_zeroed) | |
342 | 486 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), |
3766 | 487 _next_fk(HeapRegionDCTOC::NoFilterKind), _hrs_index(hrs_index), |
355 | 488 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
342 | 489 _in_collection_set(false), _is_gc_alloc_region(false), |
490 _next_in_special_set(NULL), _orig_end(NULL), | |
355 | 491 _claimed(InitialClaimValue), _evacuation_failed(false), |
342 | 492 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
493 _young_type(NotYoung), _next_young_region(NULL), | |
2152 | 494 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
495 #ifdef ASSERT | |
496 _containing_set(NULL), | |
497 #endif // ASSERT | |
498 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
499 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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500 _predicted_bytes_to_copy(0) |
342 | 501 { |
502 _orig_end = mr.end(); | |
503 // Note that initialize() will set the start of the unmarked area of the | |
504 // region. | |
356 | 505 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
506 set_top(bottom()); | |
507 set_saved_mark(); | |
342 | 508 |
509 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
510 | |
511 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
512 // In case the region is allocated during a pause, note the top. | |
513 // We haven't done any counting on a brand new region. | |
514 _top_at_conc_mark_count = bottom(); | |
515 } | |
516 | |
517 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
518 const HeapRegion* _target; | |
519 bool _target_seen; | |
520 HeapRegion* _last; | |
521 CompactibleSpace* _res; | |
522 public: | |
523 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
524 _target(target), _target_seen(false), _res(NULL) {} | |
525 bool doHeapRegion(HeapRegion* cur) { | |
526 if (_target_seen) { | |
527 if (!cur->isHumongous()) { | |
528 _res = cur; | |
529 return true; | |
530 } | |
531 } else if (cur == _target) { | |
532 _target_seen = true; | |
533 } | |
534 return false; | |
535 } | |
536 CompactibleSpace* result() { return _res; } | |
537 }; | |
538 | |
539 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
540 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
541 // cast away const-ness | |
542 HeapRegion* r = (HeapRegion*) this; | |
543 NextCompactionHeapRegionClosure blk(r); | |
544 g1h->heap_region_iterate_from(r, &blk); | |
545 return blk.result(); | |
546 } | |
547 | |
548 void HeapRegion::save_marks() { | |
549 set_saved_mark(); | |
550 } | |
551 | |
552 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
553 HeapWord* p = mr.start(); | |
554 HeapWord* e = mr.end(); | |
555 oop obj; | |
556 while (p < e) { | |
557 obj = oop(p); | |
558 p += obj->oop_iterate(cl); | |
559 } | |
560 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
561 } | |
562 | |
563 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
564 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
565 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
566 } | |
567 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
568 | |
569 | |
570 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
571 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
572 } | |
573 | |
574 HeapWord* | |
575 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
576 ObjectClosure* cl) { | |
577 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
578 // We used to use "block_start_careful" here. But we're actually happy | |
579 // to update the BOT while we do this... | |
580 HeapWord* cur = block_start(mr.start()); | |
581 mr = mr.intersection(used_region()); | |
582 if (mr.is_empty()) return NULL; | |
583 // Otherwise, find the obj that extends onto mr.start(). | |
584 | |
585 assert(cur <= mr.start() | |
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586 && (oop(cur)->klass_or_null() == NULL || |
342 | 587 cur + oop(cur)->size() > mr.start()), |
588 "postcondition of block_start"); | |
589 oop obj; | |
590 while (cur < mr.end()) { | |
591 obj = oop(cur); | |
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592 if (obj->klass_or_null() == NULL) { |
342 | 593 // Ran into an unparseable point. |
594 return cur; | |
595 } else if (!g1h->is_obj_dead(obj)) { | |
596 cl->do_object(obj); | |
597 } | |
598 if (cl->abort()) return cur; | |
599 // The check above must occur before the operation below, since an | |
600 // abort might invalidate the "size" operation. | |
601 cur += obj->size(); | |
602 } | |
603 return NULL; | |
604 } | |
605 | |
606 HeapWord* | |
607 HeapRegion:: | |
608 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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609 FilterOutOfRegionClosure* cl, |
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610 bool filter_young, |
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611 jbyte* card_ptr) { |
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612 // Currently, we should only have to clean the card if filter_young |
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613 // is true and vice versa. |
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614 if (filter_young) { |
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615 assert(card_ptr != NULL, "pre-condition"); |
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|
616 } else { |
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617 assert(card_ptr == NULL, "pre-condition"); |
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618 } |
342 | 619 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
620 | |
621 // If we're within a stop-world GC, then we might look at a card in a | |
622 // GC alloc region that extends onto a GC LAB, which may not be | |
623 // parseable. Stop such at the "saved_mark" of the region. | |
624 if (G1CollectedHeap::heap()->is_gc_active()) { | |
625 mr = mr.intersection(used_region_at_save_marks()); | |
626 } else { | |
627 mr = mr.intersection(used_region()); | |
628 } | |
629 if (mr.is_empty()) return NULL; | |
630 // Otherwise, find the obj that extends onto mr.start(). | |
631 | |
1666
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|
632 // The intersection of the incoming mr (for the card) and the |
5cbac8938c4c
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633 // allocated part of the region is non-empty. This implies that |
5cbac8938c4c
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634 // we have actually allocated into this region. The code in |
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6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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635 // G1CollectedHeap.cpp that allocates a new region sets the |
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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|
636 // is_young tag on the region before allocating. Thus we |
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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|
637 // safely know if this region is young. |
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
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diff
changeset
|
638 if (is_young() && filter_young) { |
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
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|
639 return NULL; |
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
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|
640 } |
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
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diff
changeset
|
641 |
1705 | 642 assert(!is_young(), "check value of filter_young"); |
643 | |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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644 // We can only clean the card here, after we make the decision that |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
645 // the card is not young. And we only clean the card if we have been |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
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|
646 // asked to (i.e., card_ptr != NULL). |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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647 if (card_ptr != NULL) { |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
648 *card_ptr = CardTableModRefBS::clean_card_val(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
649 // We must complete this write before we do any of the reads below. |
063382f9b575
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tonyp
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|
650 OrderAccess::storeload(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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651 } |
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|
652 |
342 | 653 // We used to use "block_start_careful" here. But we're actually happy |
654 // to update the BOT while we do this... | |
655 HeapWord* cur = block_start(mr.start()); | |
656 assert(cur <= mr.start(), "Postcondition"); | |
657 | |
658 while (cur <= mr.start()) { | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
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|
659 if (oop(cur)->klass_or_null() == NULL) { |
342 | 660 // Ran into an unparseable point. |
661 return cur; | |
662 } | |
663 // Otherwise... | |
664 int sz = oop(cur)->size(); | |
665 if (cur + sz > mr.start()) break; | |
666 // Otherwise, go on. | |
667 cur = cur + sz; | |
668 } | |
669 oop obj; | |
670 obj = oop(cur); | |
671 // If we finish this loop... | |
672 assert(cur <= mr.start() | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
673 && obj->klass_or_null() != NULL |
342 | 674 && cur + obj->size() > mr.start(), |
675 "Loop postcondition"); | |
676 if (!g1h->is_obj_dead(obj)) { | |
677 obj->oop_iterate(cl, mr); | |
678 } | |
679 | |
680 HeapWord* next; | |
681 while (cur < mr.end()) { | |
682 obj = oop(cur); | |
845
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parents:
838
diff
changeset
|
683 if (obj->klass_or_null() == NULL) { |
342 | 684 // Ran into an unparseable point. |
685 return cur; | |
686 }; | |
687 // Otherwise: | |
688 next = (cur + obj->size()); | |
689 if (!g1h->is_obj_dead(obj)) { | |
690 if (next < mr.end()) { | |
691 obj->oop_iterate(cl); | |
692 } else { | |
693 // this obj spans the boundary. If it's an array, stop at the | |
694 // boundary. | |
695 if (obj->is_objArray()) { | |
696 obj->oop_iterate(cl, mr); | |
697 } else { | |
698 obj->oop_iterate(cl); | |
699 } | |
700 } | |
701 } | |
702 cur = next; | |
703 } | |
704 return NULL; | |
705 } | |
706 | |
707 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
708 void HeapRegion::print_on(outputStream* st) const { | |
709 if (isHumongous()) { | |
710 if (startsHumongous()) | |
711 st->print(" HS"); | |
712 else | |
713 st->print(" HC"); | |
714 } else { | |
715 st->print(" "); | |
716 } | |
717 if (in_collection_set()) | |
718 st->print(" CS"); | |
719 else if (is_gc_alloc_region()) | |
720 st->print(" A "); | |
721 else | |
722 st->print(" "); | |
723 if (is_young()) | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1388
diff
changeset
|
724 st->print(is_survivor() ? " SU" : " Y "); |
342 | 725 else |
726 st->print(" "); | |
727 if (is_empty()) | |
728 st->print(" F"); | |
729 else | |
730 st->print(" "); | |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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942
diff
changeset
|
731 st->print(" %5d", _gc_time_stamp); |
1388 | 732 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
733 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 734 G1OffsetTableContigSpace::print_on(st); |
735 } | |
736 | |
811 | 737 void HeapRegion::verify(bool allow_dirty) const { |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
942
diff
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|
738 bool dummy = false; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
739 verify(allow_dirty, VerifyOption_G1UsePrevMarking, /* failures */ &dummy); |
811 | 740 } |
741 | |
342 | 742 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
743 // We would need a mechanism to make that code skip dead objects. | |
744 | |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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942
diff
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|
745 void HeapRegion::verify(bool allow_dirty, |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
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|
746 VerifyOption vo, |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
747 bool* failures) const { |
342 | 748 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
749 *failures = false; |
342 | 750 HeapWord* p = bottom(); |
751 HeapWord* prev_p = NULL; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
752 VerifyLiveClosure vl_cl(g1, vo); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
753 bool is_humongous = isHumongous(); |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
754 bool do_bot_verify = !is_young(); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
755 size_t object_num = 0; |
342 | 756 while (p < top()) { |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
757 oop obj = oop(p); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
758 size_t obj_size = obj->size(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
759 object_num += 1; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
760 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
761 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
762 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
|
763 SIZE_FORMAT" words) in a %shumongous region", |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
764 p, g1->isHumongous(obj_size) ? "" : "non-", |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
765 obj_size, is_humongous ? "" : "non-"); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
766 *failures = true; |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
767 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
768 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
769 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
770 // 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
|
771 // appropriate messasge. |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
772 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
773 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
774 return; |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
775 } |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
776 |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
777 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
778 if (obj->is_oop()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
779 klassOop klass = obj->klass(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
780 if (!klass->is_perm()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
781 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
|
782 "not in perm", klass, obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
783 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
784 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
785 } else if (!klass->is_klass()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
786 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
|
787 "not a klass", klass, obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
788 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
789 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
790 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
791 vl_cl.set_containing_obj(obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
792 obj->oop_iterate(&vl_cl); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
793 if (vl_cl.failures()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
794 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
795 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
796 if (G1MaxVerifyFailures >= 0 && |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
797 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
798 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
799 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
800 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
801 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
802 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
803 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
804 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
805 } |
342 | 806 } |
807 prev_p = p; | |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
808 p += obj_size; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
809 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
810 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
811 if (p != top()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
812 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
|
813 "does not match top "PTR_FORMAT, p, top()); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
814 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
815 return; |
342 | 816 } |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
817 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
818 HeapWord* the_end = end(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
819 assert(p == top(), "it should still hold"); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
820 // 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
|
821 // 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
|
822 // 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
|
823 if (p < the_end) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
824 // Look up top |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
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825 HeapWord* addr_1 = p; |
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826 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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827 if (b_start_1 != p) { |
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828 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
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829 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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830 addr_1, b_start_1, p); |
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831 *failures = true; |
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832 return; |
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833 } |
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834 |
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835 // Look up top + 1 |
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836 HeapWord* addr_2 = p + 1; |
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837 if (addr_2 < the_end) { |
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838 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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839 if (b_start_2 != p) { |
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840 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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841 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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842 addr_2, b_start_2, p); |
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843 *failures = true; |
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844 return; |
2133
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845 } |
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846 } |
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847 |
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848 // Look up an address between top and end |
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849 size_t diff = pointer_delta(the_end, p) / 2; |
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850 HeapWord* addr_3 = p + diff; |
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851 if (addr_3 < the_end) { |
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852 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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853 if (b_start_3 != p) { |
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854 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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855 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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856 addr_3, b_start_3, p); |
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857 *failures = true; |
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858 return; |
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859 } |
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860 } |
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861 |
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862 // Loook up end - 1 |
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863 HeapWord* addr_4 = the_end - 1; |
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864 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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865 if (b_start_4 != p) { |
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866 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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867 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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868 addr_4, b_start_4, p); |
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869 *failures = true; |
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870 return; |
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871 } |
342 | 872 } |
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873 |
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874 if (is_humongous && object_num > 1) { |
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875 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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876 "but has "SIZE_FORMAT", objects", |
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877 bottom(), end(), object_num); |
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878 *failures = true; |
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879 return; |
342 | 880 } |
881 } | |
882 | |
883 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
884 // away eventually. | |
885 | |
356 | 886 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
342 | 887 // false ==> we'll do the clearing if there's clearing to be done. |
356 | 888 ContiguousSpace::initialize(mr, false, mangle_space); |
342 | 889 _offsets.zero_bottom_entry(); |
890 _offsets.initialize_threshold(); | |
356 | 891 if (clear_space) clear(mangle_space); |
342 | 892 } |
893 | |
356 | 894 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
895 ContiguousSpace::clear(mangle_space); | |
342 | 896 _offsets.zero_bottom_entry(); |
897 _offsets.initialize_threshold(); | |
898 } | |
899 | |
900 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
901 Space::set_bottom(new_bottom); | |
902 _offsets.set_bottom(new_bottom); | |
903 } | |
904 | |
905 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
906 Space::set_end(new_end); | |
907 _offsets.resize(new_end - bottom()); | |
908 } | |
909 | |
910 void G1OffsetTableContigSpace::print() const { | |
911 print_short(); | |
912 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
913 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
914 bottom(), top(), _offsets.threshold(), end()); | |
915 } | |
916 | |
917 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
918 return _offsets.initialize_threshold(); | |
919 } | |
920 | |
921 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
922 HeapWord* end) { | |
923 _offsets.alloc_block(start, end); | |
924 return _offsets.threshold(); | |
925 } | |
926 | |
927 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
928 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
929 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
930 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
931 return top(); | |
932 else | |
933 return ContiguousSpace::saved_mark_word(); | |
934 } | |
935 | |
936 void G1OffsetTableContigSpace::set_saved_mark() { | |
937 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
938 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
939 | |
940 if (_gc_time_stamp < curr_gc_time_stamp) { | |
941 // The order of these is important, as another thread might be | |
942 // about to start scanning this region. If it does so after | |
943 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
944 // will be false, and it will pick up top() as the high water mark | |
945 // of region. If it does so after _gc_time_stamp = ..., then it | |
946 // will pick up the right saved_mark_word() as the high water mark | |
947 // of the region. Either way, the behaviour will be correct. | |
948 ContiguousSpace::set_saved_mark(); | |
845
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949 OrderAccess::storestore(); |
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950 _gc_time_stamp = curr_gc_time_stamp; |
2433
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951 // No need to do another barrier to flush the writes above. If |
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952 // this is called in parallel with other threads trying to |
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953 // allocate into the region, the caller should call this while |
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954 // holding a lock and when the lock is released the writes will be |
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955 // flushed. |
342 | 956 } |
957 } | |
958 | |
959 G1OffsetTableContigSpace:: | |
960 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
961 MemRegion mr, bool is_zeroed) : | |
962 _offsets(sharedOffsetArray, mr), | |
963 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
964 _gc_time_stamp(0) | |
965 { | |
966 _offsets.set_space(this); | |
356 | 967 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
342 | 968 } |