Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 4114:6729bbc1fcd6
7003454: order constants in constant table by number of references in code
Reviewed-by: kvn, never, bdelsart
author | twisti |
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date | Wed, 16 Nov 2011 01:39:50 -0800 |
parents | c6a6e936dc68 |
children | 53074c2c4600 |
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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 size_t HeapRegion::GrainBytes = 0; |
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39 size_t HeapRegion::GrainWords = 0; |
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40 size_t 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) | |
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48 { } |
342 | 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 int oop_size; | |
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214 OopClosure* cl2 = NULL; |
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215 |
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216 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
342 | 217 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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218 |
342 | 219 switch (_fk) { |
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220 case NoFilterKind: cl2 = cl; break; |
342 | 221 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
222 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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223 default: ShouldNotReachHere(); |
342 | 224 } |
225 | |
226 // Start filtering what we add to the remembered set. If the object is | |
227 // not considered dead, either because it is marked (in the mark bitmap) | |
228 // or it was allocated after marking finished, then we add it. Otherwise | |
229 // we can safely ignore the object. | |
230 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
231 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
232 } else { | |
233 oop_size = oop(bottom)->size(); | |
234 } | |
235 | |
236 bottom += oop_size; | |
237 | |
238 if (bottom < top) { | |
239 // We replicate the loop below for several kinds of possible filters. | |
240 switch (_fk) { | |
241 case NoFilterKind: | |
242 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
243 break; | |
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244 |
342 | 245 case IntoCSFilterKind: { |
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246 FilterIntoCSClosure filt(this, g1h, cl); |
342 | 247 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
248 break; | |
249 } | |
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250 |
342 | 251 case OutOfRegionFilterKind: { |
252 FilterOutOfRegionClosure filt(_hr, cl); | |
253 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
254 break; | |
255 } | |
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256 |
342 | 257 default: |
258 ShouldNotReachHere(); | |
259 } | |
260 | |
261 // Last object. Need to do dead-obj filtering here too. | |
262 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
263 oop(bottom)->oop_iterate(cl2, mr); | |
264 } | |
265 } | |
266 } | |
267 | |
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268 // Minimum region size; we won't go lower than that. |
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269 // We might want to decrease this in the future, to deal with small |
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270 // heaps a bit more efficiently. |
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271 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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272 |
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273 // Maximum region size; we don't go higher than that. There's a good |
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274 // reason for having an upper bound. We don't want regions to get too |
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275 // large, otherwise cleanup's effectiveness would decrease as there |
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276 // will be fewer opportunities to find totally empty regions after |
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277 // marking. |
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278 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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279 |
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280 // The automatic region size calculation will try to have around this |
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281 // many regions in the heap (based on the min heap size). |
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282 #define TARGET_REGION_NUMBER 2048 |
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283 |
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284 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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285 // region_size in bytes |
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286 uintx region_size = G1HeapRegionSize; |
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287 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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288 // We base the automatic calculation on the min heap size. This |
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289 // can be problematic if the spread between min and max is quite |
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290 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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291 // the max size, the region size might be way too large for the |
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292 // min size. Either way, some users might have to set the region |
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293 // size manually for some -Xms / -Xmx combos. |
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294 |
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295 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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296 (uintx) MIN_REGION_SIZE); |
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297 } |
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298 |
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299 int region_size_log = log2_long((jlong) region_size); |
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300 // Recalculate the region size to make sure it's a power of |
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301 // 2. This means that region_size is the largest power of 2 that's |
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302 // <= what we've calculated so far. |
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303 region_size = ((uintx)1 << region_size_log); |
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304 |
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305 // Now make sure that we don't go over or under our limits. |
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306 if (region_size < MIN_REGION_SIZE) { |
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307 region_size = MIN_REGION_SIZE; |
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308 } else if (region_size > MAX_REGION_SIZE) { |
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309 region_size = MAX_REGION_SIZE; |
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310 } |
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311 |
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312 // And recalculate the log. |
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313 region_size_log = log2_long((jlong) region_size); |
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314 |
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315 // Now, set up the globals. |
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316 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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317 LogOfHRGrainBytes = region_size_log; |
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318 |
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319 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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320 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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321 |
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322 guarantee(GrainBytes == 0, "we should only set it once"); |
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323 // The cast to int is safe, given that we've bounded region_size by |
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324 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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325 GrainBytes = (size_t)region_size; |
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326 |
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327 guarantee(GrainWords == 0, "we should only set it once"); |
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328 GrainWords = GrainBytes >> LogHeapWordSize; |
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329 guarantee((size_t)(1 << LogOfHRGrainWords) == GrainWords, "sanity"); |
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330 |
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331 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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332 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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333 } |
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334 |
342 | 335 void HeapRegion::reset_after_compaction() { |
336 G1OffsetTableContigSpace::reset_after_compaction(); | |
337 // After a compaction the mark bitmap is invalid, so we must | |
338 // treat all objects as being inside the unmarked area. | |
339 zero_marked_bytes(); | |
340 init_top_at_mark_start(); | |
341 } | |
342 | |
343 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
2152 | 344 assert(_humongous_type == NotHumongous, |
345 "we should have already filtered out humongous regions"); | |
346 assert(_humongous_start_region == NULL, | |
347 "we should have already filtered out humongous regions"); | |
348 assert(_end == _orig_end, | |
349 "we should have already filtered out humongous regions"); | |
350 | |
342 | 351 _in_collection_set = false; |
352 | |
353 set_young_index_in_cset(-1); | |
354 uninstall_surv_rate_group(); | |
355 set_young_type(NotYoung); | |
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356 reset_pre_dummy_top(); |
342 | 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 | |
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372 void HeapRegion::par_clear() { |
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373 assert(used() == 0, "the region should have been already cleared"); |
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374 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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375 HeapRegionRemSet* hrrs = rem_set(); |
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376 hrrs->clear(); |
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377 CardTableModRefBS* ct_bs = |
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378 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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379 ct_bs->clear(MemRegion(bottom(), end())); |
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380 } |
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381 |
342 | 382 // <PREDICTION> |
383 void HeapRegion::calc_gc_efficiency() { | |
384 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
385 _gc_efficiency = (double) garbage_bytes() / | |
386 g1h->predict_region_elapsed_time_ms(this, false); | |
387 } | |
388 // </PREDICTION> | |
389 | |
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390 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 391 assert(!isHumongous(), "sanity / pre-condition"); |
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392 assert(end() == _orig_end, |
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393 "Should be normal before the humongous object allocation"); |
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394 assert(top() == bottom(), "should be empty"); |
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395 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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396 |
355 | 397 _humongous_type = StartsHumongous; |
342 | 398 _humongous_start_region = this; |
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399 |
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400 set_end(new_end); |
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401 _offsets.set_for_starts_humongous(new_top); |
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402 } |
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403 |
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404 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 405 assert(!isHumongous(), "sanity / pre-condition"); |
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406 assert(end() == _orig_end, |
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407 "Should be normal before the humongous object allocation"); |
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408 assert(top() == bottom(), "should be empty"); |
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409 assert(first_hr->startsHumongous(), "pre-condition"); |
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410 |
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411 _humongous_type = ContinuesHumongous; |
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412 _humongous_start_region = first_hr; |
342 | 413 } |
414 | |
2152 | 415 void HeapRegion::set_notHumongous() { |
416 assert(isHumongous(), "pre-condition"); | |
417 | |
418 if (startsHumongous()) { | |
419 assert(top() <= end(), "pre-condition"); | |
420 set_end(_orig_end); | |
421 if (top() > end()) { | |
422 // at least one "continues humongous" region after it | |
423 set_top(end()); | |
424 } | |
425 } else { | |
426 // continues humongous | |
427 assert(end() == _orig_end, "sanity"); | |
428 } | |
429 | |
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430 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
2152 | 431 _humongous_type = NotHumongous; |
432 _humongous_start_region = NULL; | |
433 } | |
434 | |
342 | 435 bool HeapRegion::claimHeapRegion(jint claimValue) { |
436 jint current = _claimed; | |
437 if (current != claimValue) { | |
438 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
439 if (res == current) { | |
440 return true; | |
441 } | |
442 } | |
443 return false; | |
444 } | |
445 | |
446 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
447 HeapWord* low = addr; | |
448 HeapWord* high = end(); | |
449 while (low < high) { | |
450 size_t diff = pointer_delta(high, low); | |
451 // Must add one below to bias toward the high amount. Otherwise, if | |
452 // "high" were at the desired value, and "low" were one less, we | |
453 // would not converge on "high". This is not symmetric, because | |
454 // we set "high" to a block start, which might be the right one, | |
455 // which we don't do for "low". | |
456 HeapWord* middle = low + (diff+1)/2; | |
457 if (middle == high) return high; | |
458 HeapWord* mid_bs = block_start_careful(middle); | |
459 if (mid_bs < addr) { | |
460 low = middle; | |
461 } else { | |
462 high = mid_bs; | |
463 } | |
464 } | |
465 assert(low == high && low >= addr, "Didn't work."); | |
466 return low; | |
467 } | |
468 | |
356 | 469 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
470 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
342 | 471 hr_clear(false/*par*/, clear_space); |
472 } | |
473 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
474 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
475 #endif // _MSC_VER | |
476 | |
477 | |
478 HeapRegion:: | |
3766 | 479 HeapRegion(size_t hrs_index, G1BlockOffsetSharedArray* sharedOffsetArray, |
480 MemRegion mr, bool is_zeroed) | |
342 | 481 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), |
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482 _hrs_index(hrs_index), |
355 | 483 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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484 _in_collection_set(false), |
342 | 485 _next_in_special_set(NULL), _orig_end(NULL), |
355 | 486 _claimed(InitialClaimValue), _evacuation_failed(false), |
342 | 487 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
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488 _gc_efficiency(0.0), |
342 | 489 _young_type(NotYoung), _next_young_region(NULL), |
2152 | 490 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
491 #ifdef ASSERT | |
492 _containing_set(NULL), | |
493 #endif // ASSERT | |
494 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
495 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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496 _predicted_bytes_to_copy(0) |
342 | 497 { |
498 _orig_end = mr.end(); | |
499 // Note that initialize() will set the start of the unmarked area of the | |
500 // region. | |
356 | 501 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
502 set_top(bottom()); | |
503 set_saved_mark(); | |
342 | 504 |
505 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
506 | |
507 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
508 // In case the region is allocated during a pause, note the top. | |
509 // We haven't done any counting on a brand new region. | |
510 _top_at_conc_mark_count = bottom(); | |
511 } | |
512 | |
513 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
514 const HeapRegion* _target; | |
515 bool _target_seen; | |
516 HeapRegion* _last; | |
517 CompactibleSpace* _res; | |
518 public: | |
519 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
520 _target(target), _target_seen(false), _res(NULL) {} | |
521 bool doHeapRegion(HeapRegion* cur) { | |
522 if (_target_seen) { | |
523 if (!cur->isHumongous()) { | |
524 _res = cur; | |
525 return true; | |
526 } | |
527 } else if (cur == _target) { | |
528 _target_seen = true; | |
529 } | |
530 return false; | |
531 } | |
532 CompactibleSpace* result() { return _res; } | |
533 }; | |
534 | |
535 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
536 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
537 // cast away const-ness | |
538 HeapRegion* r = (HeapRegion*) this; | |
539 NextCompactionHeapRegionClosure blk(r); | |
540 g1h->heap_region_iterate_from(r, &blk); | |
541 return blk.result(); | |
542 } | |
543 | |
544 void HeapRegion::save_marks() { | |
545 set_saved_mark(); | |
546 } | |
547 | |
548 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
549 HeapWord* p = mr.start(); | |
550 HeapWord* e = mr.end(); | |
551 oop obj; | |
552 while (p < e) { | |
553 obj = oop(p); | |
554 p += obj->oop_iterate(cl); | |
555 } | |
556 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
557 } | |
558 | |
559 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
560 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
561 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
562 } | |
563 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
564 | |
565 | |
566 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
567 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
568 } | |
569 | |
570 HeapWord* | |
571 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
572 ObjectClosure* cl) { | |
573 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
574 // We used to use "block_start_careful" here. But we're actually happy | |
575 // to update the BOT while we do this... | |
576 HeapWord* cur = block_start(mr.start()); | |
577 mr = mr.intersection(used_region()); | |
578 if (mr.is_empty()) return NULL; | |
579 // Otherwise, find the obj that extends onto mr.start(). | |
580 | |
581 assert(cur <= mr.start() | |
845
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582 && (oop(cur)->klass_or_null() == NULL || |
342 | 583 cur + oop(cur)->size() > mr.start()), |
584 "postcondition of block_start"); | |
585 oop obj; | |
586 while (cur < mr.end()) { | |
587 obj = oop(cur); | |
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588 if (obj->klass_or_null() == NULL) { |
342 | 589 // Ran into an unparseable point. |
590 return cur; | |
591 } else if (!g1h->is_obj_dead(obj)) { | |
592 cl->do_object(obj); | |
593 } | |
594 if (cl->abort()) return cur; | |
595 // The check above must occur before the operation below, since an | |
596 // abort might invalidate the "size" operation. | |
597 cur += obj->size(); | |
598 } | |
599 return NULL; | |
600 } | |
601 | |
602 HeapWord* | |
603 HeapRegion:: | |
604 oops_on_card_seq_iterate_careful(MemRegion mr, | |
1666
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605 FilterOutOfRegionClosure* cl, |
3317
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606 bool filter_young, |
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607 jbyte* card_ptr) { |
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608 // Currently, we should only have to clean the card if filter_young |
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609 // is true and vice versa. |
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610 if (filter_young) { |
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611 assert(card_ptr != NULL, "pre-condition"); |
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612 } else { |
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613 assert(card_ptr == NULL, "pre-condition"); |
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614 } |
342 | 615 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
616 | |
617 // If we're within a stop-world GC, then we might look at a card in a | |
618 // GC alloc region that extends onto a GC LAB, which may not be | |
619 // parseable. Stop such at the "saved_mark" of the region. | |
620 if (G1CollectedHeap::heap()->is_gc_active()) { | |
621 mr = mr.intersection(used_region_at_save_marks()); | |
622 } else { | |
623 mr = mr.intersection(used_region()); | |
624 } | |
625 if (mr.is_empty()) return NULL; | |
626 // Otherwise, find the obj that extends onto mr.start(). | |
627 | |
1666
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628 // The intersection of the incoming mr (for the card) and the |
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629 // allocated part of the region is non-empty. This implies that |
5cbac8938c4c
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630 // we have actually allocated into this region. The code in |
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631 // G1CollectedHeap.cpp that allocates a new region sets the |
5cbac8938c4c
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632 // is_young tag on the region before allocating. Thus we |
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633 // safely know if this region is young. |
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634 if (is_young() && filter_young) { |
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635 return NULL; |
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636 } |
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637 |
1705 | 638 assert(!is_young(), "check value of filter_young"); |
639 | |
3317
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640 // 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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641 // 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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|
642 // asked to (i.e., card_ptr != NULL). |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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643 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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644 *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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645 // We must complete this write before we do any of the reads below. |
063382f9b575
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|
646 OrderAccess::storeload(); |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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647 } |
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|
648 |
342 | 649 // We used to use "block_start_careful" here. But we're actually happy |
650 // to update the BOT while we do this... | |
651 HeapWord* cur = block_start(mr.start()); | |
652 assert(cur <= mr.start(), "Postcondition"); | |
653 | |
654 while (cur <= mr.start()) { | |
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655 if (oop(cur)->klass_or_null() == NULL) { |
342 | 656 // Ran into an unparseable point. |
657 return cur; | |
658 } | |
659 // Otherwise... | |
660 int sz = oop(cur)->size(); | |
661 if (cur + sz > mr.start()) break; | |
662 // Otherwise, go on. | |
663 cur = cur + sz; | |
664 } | |
665 oop obj; | |
666 obj = oop(cur); | |
667 // If we finish this loop... | |
668 assert(cur <= mr.start() | |
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669 && obj->klass_or_null() != NULL |
342 | 670 && cur + obj->size() > mr.start(), |
671 "Loop postcondition"); | |
672 if (!g1h->is_obj_dead(obj)) { | |
673 obj->oop_iterate(cl, mr); | |
674 } | |
675 | |
676 HeapWord* next; | |
677 while (cur < mr.end()) { | |
678 obj = oop(cur); | |
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679 if (obj->klass_or_null() == NULL) { |
342 | 680 // Ran into an unparseable point. |
681 return cur; | |
682 }; | |
683 // Otherwise: | |
684 next = (cur + obj->size()); | |
685 if (!g1h->is_obj_dead(obj)) { | |
686 if (next < mr.end()) { | |
687 obj->oop_iterate(cl); | |
688 } else { | |
689 // this obj spans the boundary. If it's an array, stop at the | |
690 // boundary. | |
691 if (obj->is_objArray()) { | |
692 obj->oop_iterate(cl, mr); | |
693 } else { | |
694 obj->oop_iterate(cl); | |
695 } | |
696 } | |
697 } | |
698 cur = next; | |
699 } | |
700 return NULL; | |
701 } | |
702 | |
703 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
704 void HeapRegion::print_on(outputStream* st) const { | |
705 if (isHumongous()) { | |
706 if (startsHumongous()) | |
707 st->print(" HS"); | |
708 else | |
709 st->print(" HC"); | |
710 } else { | |
711 st->print(" "); | |
712 } | |
713 if (in_collection_set()) | |
714 st->print(" CS"); | |
715 else | |
716 st->print(" "); | |
717 if (is_young()) | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1388
diff
changeset
|
718 st->print(is_survivor() ? " SU" : " Y "); |
342 | 719 else |
720 st->print(" "); | |
721 if (is_empty()) | |
722 st->print(" F"); | |
723 else | |
724 st->print(" "); | |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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942
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changeset
|
725 st->print(" %5d", _gc_time_stamp); |
1388 | 726 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
727 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 728 G1OffsetTableContigSpace::print_on(st); |
729 } | |
730 | |
811 | 731 void HeapRegion::verify(bool allow_dirty) const { |
1020
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6882730: G1: parallel heap verification messes up region dump
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942
diff
changeset
|
732 bool dummy = false; |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
733 verify(allow_dirty, VerifyOption_G1UsePrevMarking, /* failures */ &dummy); |
811 | 734 } |
735 | |
342 | 736 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
737 // We would need a mechanism to make that code skip dead objects. | |
738 | |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
739 void HeapRegion::verify(bool allow_dirty, |
3772
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7004681: G1: Extend marking verification to Full GCs
johnc
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3766
diff
changeset
|
740 VerifyOption vo, |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
741 bool* failures) const { |
342 | 742 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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942
diff
changeset
|
743 *failures = false; |
342 | 744 HeapWord* p = bottom(); |
745 HeapWord* prev_p = NULL; | |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
746 VerifyLiveClosure vl_cl(g1, vo); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
747 bool is_humongous = isHumongous(); |
2133
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tonyp
parents:
1972
diff
changeset
|
748 bool do_bot_verify = !is_young(); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
749 size_t object_num = 0; |
342 | 750 while (p < top()) { |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
751 oop obj = oop(p); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
752 size_t obj_size = obj->size(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
753 object_num += 1; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
754 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
755 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
756 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
|
757 SIZE_FORMAT" words) in a %shumongous region", |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
758 p, g1->isHumongous(obj_size) ? "" : "non-", |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
759 obj_size, is_humongous ? "" : "non-"); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
760 *failures = true; |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
761 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
762 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
763 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
764 // 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
|
765 // appropriate messasge. |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
766 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
|
767 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
768 return; |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
769 } |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
770 |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
771 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
|
772 if (obj->is_oop()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
773 klassOop klass = obj->klass(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
774 if (!klass->is_perm()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
775 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
|
776 "not in perm", klass, obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
777 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
778 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
779 } else if (!klass->is_klass()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
780 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
|
781 "not a klass", klass, obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
782 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
783 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
784 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
785 vl_cl.set_containing_obj(obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
786 obj->oop_iterate(&vl_cl); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
787 if (vl_cl.failures()) { |
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 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
790 if (G1MaxVerifyFailures >= 0 && |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
791 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
792 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
793 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
794 } |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
795 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
796 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
|
797 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
798 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
942
diff
changeset
|
799 } |
342 | 800 } |
801 prev_p = p; | |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
802 p += obj_size; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
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803 } |
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804 |
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805 if (p != top()) { |
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806 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
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807 "does not match top "PTR_FORMAT, p, top()); |
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808 *failures = true; |
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809 return; |
342 | 810 } |
2133
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811 |
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812 HeapWord* the_end = end(); |
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813 assert(p == top(), "it should still hold"); |
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814 // Do some extra BOT consistency checking for addresses in the |
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815 // range [top, end). BOT look-ups in this range should yield |
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816 // top. No point in doing that if top == end (there's nothing there). |
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817 if (p < the_end) { |
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818 // Look up top |
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819 HeapWord* addr_1 = p; |
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820 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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821 if (b_start_1 != p) { |
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822 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
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823 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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824 addr_1, b_start_1, p); |
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825 *failures = true; |
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826 return; |
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827 } |
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828 |
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829 // Look up top + 1 |
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830 HeapWord* addr_2 = p + 1; |
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831 if (addr_2 < the_end) { |
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832 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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833 if (b_start_2 != p) { |
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834 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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835 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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836 addr_2, b_start_2, p); |
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837 *failures = true; |
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838 return; |
2133
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839 } |
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840 } |
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841 |
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842 // Look up an address between top and end |
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843 size_t diff = pointer_delta(the_end, p) / 2; |
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844 HeapWord* addr_3 = p + diff; |
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845 if (addr_3 < the_end) { |
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846 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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847 if (b_start_3 != p) { |
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848 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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|
849 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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|
850 addr_3, b_start_3, p); |
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851 *failures = true; |
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852 return; |
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|
853 } |
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854 } |
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855 |
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856 // Loook up end - 1 |
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857 HeapWord* addr_4 = the_end - 1; |
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858 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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859 if (b_start_4 != p) { |
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860 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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861 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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862 addr_4, b_start_4, p); |
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863 *failures = true; |
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|
864 return; |
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|
865 } |
342 | 866 } |
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diff
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|
867 |
1718
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1705
diff
changeset
|
868 if (is_humongous && object_num > 1) { |
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tonyp
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1705
diff
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|
869 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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|
870 "but has "SIZE_FORMAT", objects", |
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diff
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|
871 bottom(), end(), object_num); |
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872 *failures = true; |
1020
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|
873 return; |
342 | 874 } |
875 } | |
876 | |
877 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
878 // away eventually. | |
879 | |
356 | 880 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
342 | 881 // false ==> we'll do the clearing if there's clearing to be done. |
356 | 882 ContiguousSpace::initialize(mr, false, mangle_space); |
342 | 883 _offsets.zero_bottom_entry(); |
884 _offsets.initialize_threshold(); | |
356 | 885 if (clear_space) clear(mangle_space); |
342 | 886 } |
887 | |
356 | 888 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
889 ContiguousSpace::clear(mangle_space); | |
342 | 890 _offsets.zero_bottom_entry(); |
891 _offsets.initialize_threshold(); | |
892 } | |
893 | |
894 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
895 Space::set_bottom(new_bottom); | |
896 _offsets.set_bottom(new_bottom); | |
897 } | |
898 | |
899 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
900 Space::set_end(new_end); | |
901 _offsets.resize(new_end - bottom()); | |
902 } | |
903 | |
904 void G1OffsetTableContigSpace::print() const { | |
905 print_short(); | |
906 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
907 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
908 bottom(), top(), _offsets.threshold(), end()); | |
909 } | |
910 | |
911 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
912 return _offsets.initialize_threshold(); | |
913 } | |
914 | |
915 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
916 HeapWord* end) { | |
917 _offsets.alloc_block(start, end); | |
918 return _offsets.threshold(); | |
919 } | |
920 | |
921 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
922 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
923 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
924 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
925 return top(); | |
926 else | |
927 return ContiguousSpace::saved_mark_word(); | |
928 } | |
929 | |
930 void G1OffsetTableContigSpace::set_saved_mark() { | |
931 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
932 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
933 | |
934 if (_gc_time_stamp < curr_gc_time_stamp) { | |
935 // The order of these is important, as another thread might be | |
936 // about to start scanning this region. If it does so after | |
937 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
938 // will be false, and it will pick up top() as the high water mark | |
939 // of region. If it does so after _gc_time_stamp = ..., then it | |
940 // will pick up the right saved_mark_word() as the high water mark | |
941 // of the region. Either way, the behaviour will be correct. | |
942 ContiguousSpace::set_saved_mark(); | |
845
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943 OrderAccess::storestore(); |
353
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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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944 _gc_time_stamp = curr_gc_time_stamp; |
2433
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945 // No need to do another barrier to flush the writes above. If |
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946 // this is called in parallel with other threads trying to |
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947 // allocate into the region, the caller should call this while |
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948 // holding a lock and when the lock is released the writes will be |
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949 // flushed. |
342 | 950 } |
951 } | |
952 | |
953 G1OffsetTableContigSpace:: | |
954 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
955 MemRegion mr, bool is_zeroed) : | |
956 _offsets(sharedOffsetArray, mr), | |
957 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
958 _gc_time_stamp(0) | |
959 { | |
960 _offsets.set_space(this); | |
356 | 961 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
342 | 962 } |