Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 3766:c3f1170908be
7045330: G1: Simplify/fix the HeapRegionSeq class
7042285: G1: native memory leak during humongous object allocation
6804436: G1: heap region indices should be size_t
Summary: A series of fixes and improvements to the HeapRegionSeq class: a) replace the _regions growable array with a standard C array, b) avoid de-allocating / re-allocating HeapRegion instances when the heap shrinks / grows (fix for 7042285), c) introduce fast method to map address to HeapRegion via a "biased" array pointer, d) embed the _hrs object in G1CollectedHeap, instead of pointing to it via an indirection, e) assume that all the regions added to the HeapRegionSeq instance are contiguous, f) replace int's with size_t's for indexes (and expand that to HeapRegion as part of 6804436), g) remove unnecessary / unused methods, h) rename a couple of fields (_alloc_search_start and _seq_bottom), i) fix iterate_from() not to always start from index 0 irrespective of the region passed to it, j) add a verification method to check the HeapRegionSeq assumptions, k) always call the wrappers for _hrs.iterate(), _hrs_length(), and _hrs.at() from G1CollectedHeap, not those methods directly, and l) unify the code that expands the sequence (by either re-using or creating a new HeapRegion) and make it robust wrt to a HeapRegion allocation failing.
Reviewed-by: stefank, johnc, brutisso
author | tonyp |
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date | Fri, 10 Jun 2011 13:16:40 -0400 |
parents | 063382f9b575 |
children | 6747fd0512e0 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/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; | |
811 | 63 bool _use_prev_marking; |
342 | 64 public: |
811 | 65 // use_prev_marking == true -> use "prev" marking information, |
66 // use_prev_marking == false -> use "next" marking information | |
67 VerifyLiveClosure(G1CollectedHeap* g1h, bool use_prev_marking) : | |
342 | 68 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
811 | 69 _failures(false), _n_failures(0), _use_prev_marking(use_prev_marking) |
342 | 70 { |
71 BarrierSet* bs = _g1h->barrier_set(); | |
72 if (bs->is_a(BarrierSet::CardTableModRef)) | |
73 _bs = (CardTableModRefBS*)bs; | |
74 } | |
75 | |
76 void set_containing_obj(oop obj) { | |
77 _containing_obj = obj; | |
78 } | |
79 | |
80 bool failures() { return _failures; } | |
81 int n_failures() { return _n_failures; } | |
82 | |
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83 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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84 virtual void do_oop( oop* p) { do_oop_work(p); } |
342 | 85 |
1388 | 86 void print_object(outputStream* out, oop obj) { |
87 #ifdef PRODUCT | |
88 klassOop k = obj->klass(); | |
89 const char* class_name = instanceKlass::cast(k)->external_name(); | |
90 out->print_cr("class name %s", class_name); | |
91 #else // PRODUCT | |
92 obj->print_on(out); | |
93 #endif // PRODUCT | |
94 } | |
95 | |
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96 template <class T> void do_oop_work(T* p) { |
342 | 97 assert(_containing_obj != NULL, "Precondition"); |
811 | 98 assert(!_g1h->is_obj_dead_cond(_containing_obj, _use_prev_marking), |
99 "Precondition"); | |
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100 T heap_oop = oopDesc::load_heap_oop(p); |
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101 if (!oopDesc::is_null(heap_oop)) { |
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102 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 103 bool failed = false; |
811 | 104 if (!_g1h->is_in_closed_subset(obj) || |
105 _g1h->is_obj_dead_cond(obj, _use_prev_marking)) { | |
342 | 106 if (!_failures) { |
107 gclog_or_tty->print_cr(""); | |
108 gclog_or_tty->print_cr("----------"); | |
109 } | |
110 if (!_g1h->is_in_closed_subset(obj)) { | |
1388 | 111 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
342 | 112 gclog_or_tty->print_cr("Field "PTR_FORMAT |
1388 | 113 " of live obj "PTR_FORMAT" in region " |
114 "["PTR_FORMAT", "PTR_FORMAT")", | |
115 p, (void*) _containing_obj, | |
116 from->bottom(), from->end()); | |
117 print_object(gclog_or_tty, _containing_obj); | |
118 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
119 (void*) obj); | |
120 } else { | |
121 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
122 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
123 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
124 " of live obj "PTR_FORMAT" in region " | |
125 "["PTR_FORMAT", "PTR_FORMAT")", | |
126 p, (void*) _containing_obj, | |
127 from->bottom(), from->end()); | |
128 print_object(gclog_or_tty, _containing_obj); | |
129 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
130 "["PTR_FORMAT", "PTR_FORMAT")", | |
131 (void*) obj, to->bottom(), to->end()); | |
132 print_object(gclog_or_tty, obj); | |
342 | 133 } |
134 gclog_or_tty->print_cr("----------"); | |
135 _failures = true; | |
136 failed = true; | |
137 _n_failures++; | |
138 } | |
139 | |
140 if (!_g1h->full_collection()) { | |
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141 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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142 HeapRegion* to = _g1h->heap_region_containing(obj); |
342 | 143 if (from != NULL && to != NULL && |
144 from != to && | |
145 !to->isHumongous()) { | |
146 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
147 jbyte cv_field = *_bs->byte_for_const(p); | |
148 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
149 | |
150 bool is_bad = !(from->is_young() | |
151 || to->rem_set()->contains_reference(p) | |
152 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
153 (_containing_obj->is_objArray() ? | |
154 cv_field == dirty | |
155 : cv_obj == dirty || cv_field == dirty)); | |
156 if (is_bad) { | |
157 if (!_failures) { | |
158 gclog_or_tty->print_cr(""); | |
159 gclog_or_tty->print_cr("----------"); | |
160 } | |
161 gclog_or_tty->print_cr("Missing rem set entry:"); | |
3766 | 162 gclog_or_tty->print_cr("Field "PTR_FORMAT" " |
163 "of obj "PTR_FORMAT", " | |
164 "in region "HR_FORMAT, | |
165 p, (void*) _containing_obj, | |
166 HR_FORMAT_PARAMS(from)); | |
342 | 167 _containing_obj->print_on(gclog_or_tty); |
3766 | 168 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " |
169 "in region "HR_FORMAT, | |
170 (void*) obj, | |
171 HR_FORMAT_PARAMS(to)); | |
342 | 172 obj->print_on(gclog_or_tty); |
173 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
174 cv_obj, cv_field); | |
175 gclog_or_tty->print_cr("----------"); | |
176 _failures = true; | |
177 if (!failed) _n_failures++; | |
178 } | |
179 } | |
180 } | |
181 } | |
182 } | |
183 }; | |
184 | |
185 template<class ClosureType> | |
186 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
187 HeapRegion* hr, | |
188 HeapWord* cur, HeapWord* top) { | |
189 oop cur_oop = oop(cur); | |
190 int oop_size = cur_oop->size(); | |
191 HeapWord* next_obj = cur + oop_size; | |
192 while (next_obj < top) { | |
193 // Keep filtering the remembered set. | |
194 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
195 // Bottom lies entirely below top, so we can call the | |
196 // non-memRegion version of oop_iterate below. | |
197 cur_oop->oop_iterate(cl); | |
198 } | |
199 cur = next_obj; | |
200 cur_oop = oop(cur); | |
201 oop_size = cur_oop->size(); | |
202 next_obj = cur + oop_size; | |
203 } | |
204 return cur; | |
205 } | |
206 | |
207 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
208 HeapWord* bottom, | |
209 HeapWord* top, | |
210 OopClosure* cl) { | |
211 G1CollectedHeap* g1h = _g1; | |
212 | |
213 int oop_size; | |
214 | |
215 OopClosure* cl2 = cl; | |
216 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
217 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
218 switch (_fk) { | |
219 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
220 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
221 } | |
222 | |
223 // Start filtering what we add to the remembered set. If the object is | |
224 // not considered dead, either because it is marked (in the mark bitmap) | |
225 // or it was allocated after marking finished, then we add it. Otherwise | |
226 // we can safely ignore the object. | |
227 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
228 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
229 } else { | |
230 oop_size = oop(bottom)->size(); | |
231 } | |
232 | |
233 bottom += oop_size; | |
234 | |
235 if (bottom < top) { | |
236 // We replicate the loop below for several kinds of possible filters. | |
237 switch (_fk) { | |
238 case NoFilterKind: | |
239 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
240 break; | |
241 case IntoCSFilterKind: { | |
242 FilterIntoCSClosure filt(this, g1h, cl); | |
243 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
244 break; | |
245 } | |
246 case OutOfRegionFilterKind: { | |
247 FilterOutOfRegionClosure filt(_hr, cl); | |
248 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
249 break; | |
250 } | |
251 default: | |
252 ShouldNotReachHere(); | |
253 } | |
254 | |
255 // Last object. Need to do dead-obj filtering here too. | |
256 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
257 oop(bottom)->oop_iterate(cl2, mr); | |
258 } | |
259 } | |
260 } | |
261 | |
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262 // Minimum region size; we won't go lower than that. |
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263 // We might want to decrease this in the future, to deal with small |
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264 // heaps a bit more efficiently. |
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265 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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266 |
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267 // Maximum region size; we don't go higher than that. There's a good |
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268 // reason for having an upper bound. We don't want regions to get too |
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269 // large, otherwise cleanup's effectiveness would decrease as there |
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270 // will be fewer opportunities to find totally empty regions after |
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271 // marking. |
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272 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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273 |
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274 // The automatic region size calculation will try to have around this |
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275 // many regions in the heap (based on the min heap size). |
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276 #define TARGET_REGION_NUMBER 2048 |
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277 |
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278 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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279 // region_size in bytes |
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280 uintx region_size = G1HeapRegionSize; |
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281 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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282 // We base the automatic calculation on the min heap size. This |
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283 // can be problematic if the spread between min and max is quite |
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284 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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285 // the max size, the region size might be way too large for the |
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286 // min size. Either way, some users might have to set the region |
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287 // size manually for some -Xms / -Xmx combos. |
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288 |
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289 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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290 (uintx) MIN_REGION_SIZE); |
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291 } |
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292 |
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293 int region_size_log = log2_long((jlong) region_size); |
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294 // Recalculate the region size to make sure it's a power of |
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295 // 2. This means that region_size is the largest power of 2 that's |
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296 // <= what we've calculated so far. |
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297 region_size = ((uintx)1 << region_size_log); |
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298 |
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299 // Now make sure that we don't go over or under our limits. |
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300 if (region_size < MIN_REGION_SIZE) { |
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301 region_size = MIN_REGION_SIZE; |
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302 } else if (region_size > MAX_REGION_SIZE) { |
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303 region_size = MAX_REGION_SIZE; |
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304 } |
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305 |
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306 // And recalculate the log. |
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307 region_size_log = log2_long((jlong) region_size); |
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308 |
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309 // Now, set up the globals. |
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310 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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311 LogOfHRGrainBytes = region_size_log; |
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312 |
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313 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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314 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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315 |
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316 guarantee(GrainBytes == 0, "we should only set it once"); |
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317 // The cast to int is safe, given that we've bounded region_size by |
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318 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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319 GrainBytes = (int) region_size; |
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320 |
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321 guarantee(GrainWords == 0, "we should only set it once"); |
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322 GrainWords = GrainBytes >> LogHeapWordSize; |
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323 guarantee(1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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324 |
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325 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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326 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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327 } |
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328 |
342 | 329 void HeapRegion::reset_after_compaction() { |
330 G1OffsetTableContigSpace::reset_after_compaction(); | |
331 // After a compaction the mark bitmap is invalid, so we must | |
332 // treat all objects as being inside the unmarked area. | |
333 zero_marked_bytes(); | |
334 init_top_at_mark_start(); | |
335 } | |
336 | |
337 DirtyCardToOopClosure* | |
338 HeapRegion::new_dcto_closure(OopClosure* cl, | |
339 CardTableModRefBS::PrecisionStyle precision, | |
340 HeapRegionDCTOC::FilterKind fk) { | |
341 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
342 this, cl, precision, fk); | |
343 } | |
344 | |
345 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
2152 | 346 assert(_humongous_type == NotHumongous, |
347 "we should have already filtered out humongous regions"); | |
348 assert(_humongous_start_region == NULL, | |
349 "we should have already filtered out humongous regions"); | |
350 assert(_end == _orig_end, | |
351 "we should have already filtered out humongous regions"); | |
352 | |
342 | 353 _in_collection_set = false; |
354 _is_gc_alloc_region = false; | |
355 | |
356 set_young_index_in_cset(-1); | |
357 uninstall_surv_rate_group(); | |
358 set_young_type(NotYoung); | |
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359 reset_pre_dummy_top(); |
342 | 360 |
361 if (!par) { | |
362 // If this is parallel, this will be done later. | |
363 HeapRegionRemSet* hrrs = rem_set(); | |
364 if (hrrs != NULL) hrrs->clear(); | |
355 | 365 _claimed = InitialClaimValue; |
342 | 366 } |
367 zero_marked_bytes(); | |
368 set_sort_index(-1); | |
369 | |
370 _offsets.resize(HeapRegion::GrainWords); | |
371 init_top_at_mark_start(); | |
356 | 372 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 373 } |
374 | |
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375 void HeapRegion::par_clear() { |
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376 assert(used() == 0, "the region should have been already cleared"); |
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377 assert(capacity() == (size_t) HeapRegion::GrainBytes, |
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378 "should be back to normal"); |
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379 HeapRegionRemSet* hrrs = rem_set(); |
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380 hrrs->clear(); |
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381 CardTableModRefBS* ct_bs = |
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382 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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383 ct_bs->clear(MemRegion(bottom(), end())); |
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384 } |
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385 |
342 | 386 // <PREDICTION> |
387 void HeapRegion::calc_gc_efficiency() { | |
388 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
389 _gc_efficiency = (double) garbage_bytes() / | |
390 g1h->predict_region_elapsed_time_ms(this, false); | |
391 } | |
392 // </PREDICTION> | |
393 | |
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394 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 395 assert(!isHumongous(), "sanity / pre-condition"); |
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396 assert(end() == _orig_end, |
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397 "Should be normal before the humongous object allocation"); |
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398 assert(top() == bottom(), "should be empty"); |
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399 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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400 |
355 | 401 _humongous_type = StartsHumongous; |
342 | 402 _humongous_start_region = this; |
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403 |
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404 set_end(new_end); |
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405 _offsets.set_for_starts_humongous(new_top); |
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406 } |
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407 |
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408 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 409 assert(!isHumongous(), "sanity / pre-condition"); |
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410 assert(end() == _orig_end, |
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411 "Should be normal before the humongous object allocation"); |
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412 assert(top() == bottom(), "should be empty"); |
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413 assert(first_hr->startsHumongous(), "pre-condition"); |
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414 |
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415 _humongous_type = ContinuesHumongous; |
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416 _humongous_start_region = first_hr; |
342 | 417 } |
418 | |
2152 | 419 void HeapRegion::set_notHumongous() { |
420 assert(isHumongous(), "pre-condition"); | |
421 | |
422 if (startsHumongous()) { | |
423 assert(top() <= end(), "pre-condition"); | |
424 set_end(_orig_end); | |
425 if (top() > end()) { | |
426 // at least one "continues humongous" region after it | |
427 set_top(end()); | |
428 } | |
429 } else { | |
430 // continues humongous | |
431 assert(end() == _orig_end, "sanity"); | |
432 } | |
433 | |
434 assert(capacity() == (size_t) HeapRegion::GrainBytes, "pre-condition"); | |
435 _humongous_type = NotHumongous; | |
436 _humongous_start_region = NULL; | |
437 } | |
438 | |
342 | 439 bool HeapRegion::claimHeapRegion(jint claimValue) { |
440 jint current = _claimed; | |
441 if (current != claimValue) { | |
442 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
443 if (res == current) { | |
444 return true; | |
445 } | |
446 } | |
447 return false; | |
448 } | |
449 | |
450 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
451 HeapWord* low = addr; | |
452 HeapWord* high = end(); | |
453 while (low < high) { | |
454 size_t diff = pointer_delta(high, low); | |
455 // Must add one below to bias toward the high amount. Otherwise, if | |
456 // "high" were at the desired value, and "low" were one less, we | |
457 // would not converge on "high". This is not symmetric, because | |
458 // we set "high" to a block start, which might be the right one, | |
459 // which we don't do for "low". | |
460 HeapWord* middle = low + (diff+1)/2; | |
461 if (middle == high) return high; | |
462 HeapWord* mid_bs = block_start_careful(middle); | |
463 if (mid_bs < addr) { | |
464 low = middle; | |
465 } else { | |
466 high = mid_bs; | |
467 } | |
468 } | |
469 assert(low == high && low >= addr, "Didn't work."); | |
470 return low; | |
471 } | |
472 | |
356 | 473 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
474 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
342 | 475 hr_clear(false/*par*/, clear_space); |
476 } | |
477 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
478 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
479 #endif // _MSC_VER | |
480 | |
481 | |
482 HeapRegion:: | |
3766 | 483 HeapRegion(size_t hrs_index, G1BlockOffsetSharedArray* sharedOffsetArray, |
484 MemRegion mr, bool is_zeroed) | |
342 | 485 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), |
3766 | 486 _next_fk(HeapRegionDCTOC::NoFilterKind), _hrs_index(hrs_index), |
355 | 487 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
342 | 488 _in_collection_set(false), _is_gc_alloc_region(false), |
489 _next_in_special_set(NULL), _orig_end(NULL), | |
355 | 490 _claimed(InitialClaimValue), _evacuation_failed(false), |
342 | 491 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
492 _young_type(NotYoung), _next_young_region(NULL), | |
2152 | 493 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
494 #ifdef ASSERT | |
495 _containing_set(NULL), | |
496 #endif // ASSERT | |
497 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
498 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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499 _predicted_bytes_to_copy(0) |
342 | 500 { |
501 _orig_end = mr.end(); | |
502 // Note that initialize() will set the start of the unmarked area of the | |
503 // region. | |
356 | 504 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
505 set_top(bottom()); | |
506 set_saved_mark(); | |
342 | 507 |
508 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
509 | |
510 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
511 // In case the region is allocated during a pause, note the top. | |
512 // We haven't done any counting on a brand new region. | |
513 _top_at_conc_mark_count = bottom(); | |
514 } | |
515 | |
516 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
517 const HeapRegion* _target; | |
518 bool _target_seen; | |
519 HeapRegion* _last; | |
520 CompactibleSpace* _res; | |
521 public: | |
522 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
523 _target(target), _target_seen(false), _res(NULL) {} | |
524 bool doHeapRegion(HeapRegion* cur) { | |
525 if (_target_seen) { | |
526 if (!cur->isHumongous()) { | |
527 _res = cur; | |
528 return true; | |
529 } | |
530 } else if (cur == _target) { | |
531 _target_seen = true; | |
532 } | |
533 return false; | |
534 } | |
535 CompactibleSpace* result() { return _res; } | |
536 }; | |
537 | |
538 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
539 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
540 // cast away const-ness | |
541 HeapRegion* r = (HeapRegion*) this; | |
542 NextCompactionHeapRegionClosure blk(r); | |
543 g1h->heap_region_iterate_from(r, &blk); | |
544 return blk.result(); | |
545 } | |
546 | |
547 void HeapRegion::save_marks() { | |
548 set_saved_mark(); | |
549 } | |
550 | |
551 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
552 HeapWord* p = mr.start(); | |
553 HeapWord* e = mr.end(); | |
554 oop obj; | |
555 while (p < e) { | |
556 obj = oop(p); | |
557 p += obj->oop_iterate(cl); | |
558 } | |
559 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
560 } | |
561 | |
562 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
563 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
564 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
565 } | |
566 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
567 | |
568 | |
569 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
570 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
571 } | |
572 | |
573 HeapWord* | |
574 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
575 ObjectClosure* cl) { | |
576 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
577 // We used to use "block_start_careful" here. But we're actually happy | |
578 // to update the BOT while we do this... | |
579 HeapWord* cur = block_start(mr.start()); | |
580 mr = mr.intersection(used_region()); | |
581 if (mr.is_empty()) return NULL; | |
582 // Otherwise, find the obj that extends onto mr.start(). | |
583 | |
584 assert(cur <= mr.start() | |
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585 && (oop(cur)->klass_or_null() == NULL || |
342 | 586 cur + oop(cur)->size() > mr.start()), |
587 "postcondition of block_start"); | |
588 oop obj; | |
589 while (cur < mr.end()) { | |
590 obj = oop(cur); | |
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591 if (obj->klass_or_null() == NULL) { |
342 | 592 // Ran into an unparseable point. |
593 return cur; | |
594 } else if (!g1h->is_obj_dead(obj)) { | |
595 cl->do_object(obj); | |
596 } | |
597 if (cl->abort()) return cur; | |
598 // The check above must occur before the operation below, since an | |
599 // abort might invalidate the "size" operation. | |
600 cur += obj->size(); | |
601 } | |
602 return NULL; | |
603 } | |
604 | |
605 HeapWord* | |
606 HeapRegion:: | |
607 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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608 FilterOutOfRegionClosure* cl, |
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609 bool filter_young, |
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610 jbyte* card_ptr) { |
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611 // Currently, we should only have to clean the card if filter_young |
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612 // is true and vice versa. |
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613 if (filter_young) { |
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614 assert(card_ptr != NULL, "pre-condition"); |
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615 } else { |
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616 assert(card_ptr == NULL, "pre-condition"); |
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617 } |
342 | 618 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
619 | |
620 // If we're within a stop-world GC, then we might look at a card in a | |
621 // GC alloc region that extends onto a GC LAB, which may not be | |
622 // parseable. Stop such at the "saved_mark" of the region. | |
623 if (G1CollectedHeap::heap()->is_gc_active()) { | |
624 mr = mr.intersection(used_region_at_save_marks()); | |
625 } else { | |
626 mr = mr.intersection(used_region()); | |
627 } | |
628 if (mr.is_empty()) return NULL; | |
629 // Otherwise, find the obj that extends onto mr.start(). | |
630 | |
1666
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631 // The intersection of the incoming mr (for the card) and the |
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632 // allocated part of the region is non-empty. This implies that |
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633 // 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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634 // G1CollectedHeap.cpp that allocates a new region sets the |
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635 // 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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636 // safely know if this region is young. |
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diff
changeset
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637 if (is_young() && filter_young) { |
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6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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638 return NULL; |
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6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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|
639 } |
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6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
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diff
changeset
|
640 |
1705 | 641 assert(!is_young(), "check value of filter_young"); |
642 | |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
643 // 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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|
644 // 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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645 // 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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|
646 if (card_ptr != NULL) { |
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|
647 *card_ptr = CardTableModRefBS::clean_card_val(); |
063382f9b575
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|
648 // We must complete this write before we do any of the reads below. |
063382f9b575
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|
649 OrderAccess::storeload(); |
063382f9b575
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650 } |
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651 |
342 | 652 // We used to use "block_start_careful" here. But we're actually happy |
653 // to update the BOT while we do this... | |
654 HeapWord* cur = block_start(mr.start()); | |
655 assert(cur <= mr.start(), "Postcondition"); | |
656 | |
657 while (cur <= mr.start()) { | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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658 if (oop(cur)->klass_or_null() == NULL) { |
342 | 659 // Ran into an unparseable point. |
660 return cur; | |
661 } | |
662 // Otherwise... | |
663 int sz = oop(cur)->size(); | |
664 if (cur + sz > mr.start()) break; | |
665 // Otherwise, go on. | |
666 cur = cur + sz; | |
667 } | |
668 oop obj; | |
669 obj = oop(cur); | |
670 // If we finish this loop... | |
671 assert(cur <= mr.start() | |
845
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672 && obj->klass_or_null() != NULL |
342 | 673 && cur + obj->size() > mr.start(), |
674 "Loop postcondition"); | |
675 if (!g1h->is_obj_dead(obj)) { | |
676 obj->oop_iterate(cl, mr); | |
677 } | |
678 | |
679 HeapWord* next; | |
680 while (cur < mr.end()) { | |
681 obj = oop(cur); | |
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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682 if (obj->klass_or_null() == NULL) { |
342 | 683 // Ran into an unparseable point. |
684 return cur; | |
685 }; | |
686 // Otherwise: | |
687 next = (cur + obj->size()); | |
688 if (!g1h->is_obj_dead(obj)) { | |
689 if (next < mr.end()) { | |
690 obj->oop_iterate(cl); | |
691 } else { | |
692 // this obj spans the boundary. If it's an array, stop at the | |
693 // boundary. | |
694 if (obj->is_objArray()) { | |
695 obj->oop_iterate(cl, mr); | |
696 } else { | |
697 obj->oop_iterate(cl); | |
698 } | |
699 } | |
700 } | |
701 cur = next; | |
702 } | |
703 return NULL; | |
704 } | |
705 | |
706 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
707 void HeapRegion::print_on(outputStream* st) const { | |
708 if (isHumongous()) { | |
709 if (startsHumongous()) | |
710 st->print(" HS"); | |
711 else | |
712 st->print(" HC"); | |
713 } else { | |
714 st->print(" "); | |
715 } | |
716 if (in_collection_set()) | |
717 st->print(" CS"); | |
718 else if (is_gc_alloc_region()) | |
719 st->print(" A "); | |
720 else | |
721 st->print(" "); | |
722 if (is_young()) | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1388
diff
changeset
|
723 st->print(is_survivor() ? " SU" : " Y "); |
342 | 724 else |
725 st->print(" "); | |
726 if (is_empty()) | |
727 st->print(" F"); | |
728 else | |
729 st->print(" "); | |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
730 st->print(" %5d", _gc_time_stamp); |
1388 | 731 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
732 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 733 G1OffsetTableContigSpace::print_on(st); |
734 } | |
735 | |
811 | 736 void HeapRegion::verify(bool allow_dirty) const { |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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|
737 bool dummy = false; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
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|
738 verify(allow_dirty, /* use_prev_marking */ true, /* failures */ &dummy); |
811 | 739 } |
740 | |
342 | 741 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
742 // We would need a mechanism to make that code skip dead objects. | |
743 | |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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942
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|
744 void HeapRegion::verify(bool allow_dirty, |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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942
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|
745 bool use_prev_marking, |
ff2402f6a50b
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tonyp
parents:
942
diff
changeset
|
746 bool* failures) const { |
342 | 747 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
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diff
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|
748 *failures = false; |
342 | 749 HeapWord* p = bottom(); |
750 HeapWord* prev_p = NULL; | |
811 | 751 VerifyLiveClosure vl_cl(g1, use_prev_marking); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
752 bool is_humongous = isHumongous(); |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
753 bool do_bot_verify = !is_young(); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
754 size_t object_num = 0; |
342 | 755 while (p < top()) { |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
756 oop obj = oop(p); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
757 size_t obj_size = obj->size(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
758 object_num += 1; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
759 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
760 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
761 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
|
762 SIZE_FORMAT" words) in a %shumongous region", |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
763 p, g1->isHumongous(obj_size) ? "" : "non-", |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
764 obj_size, is_humongous ? "" : "non-"); |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
765 *failures = true; |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
766 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
767 } |
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 // 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
|
770 // appropriate messasge. |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
771 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
|
772 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
773 return; |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
774 } |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
775 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
776 if (!g1->is_obj_dead_cond(obj, this, use_prev_marking)) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
777 if (obj->is_oop()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
778 klassOop klass = obj->klass(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
779 if (!klass->is_perm()) { |
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 in perm", 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 if (!klass->is_klass()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
785 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
|
786 "not a klass", klass, obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
787 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
788 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
789 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
790 vl_cl.set_containing_obj(obj); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
791 obj->oop_iterate(&vl_cl); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
792 if (vl_cl.failures()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
793 *failures = true; |
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 if (G1MaxVerifyFailures >= 0 && |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
796 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
797 return; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
798 } |
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 } else { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
801 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
|
802 *failures = true; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
803 return; |
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
804 } |
342 | 805 } |
806 prev_p = p; | |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
807 p += obj_size; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
808 } |
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 if (p != top()) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
811 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
|
812 "does not match top "PTR_FORMAT, p, top()); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
813 *failures = true; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
814 return; |
342 | 815 } |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
816 |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
817 HeapWord* the_end = end(); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
818 assert(p == top(), "it should still hold"); |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
819 // 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
|
820 // 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
|
821 // 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
|
822 if (p < the_end) { |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
823 // Look up top |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
824 HeapWord* addr_1 = p; |
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
825 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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826 if (b_start_1 != p) { |
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827 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
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828 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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829 addr_1, b_start_1, p); |
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830 *failures = true; |
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831 return; |
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832 } |
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833 |
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834 // Look up top + 1 |
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835 HeapWord* addr_2 = p + 1; |
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836 if (addr_2 < the_end) { |
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837 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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838 if (b_start_2 != p) { |
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839 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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840 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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841 addr_2, b_start_2, p); |
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842 *failures = true; |
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843 return; |
2133
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844 } |
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845 } |
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846 |
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847 // Look up an address between top and end |
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848 size_t diff = pointer_delta(the_end, p) / 2; |
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849 HeapWord* addr_3 = p + diff; |
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850 if (addr_3 < the_end) { |
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851 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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852 if (b_start_3 != p) { |
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853 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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854 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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855 addr_3, b_start_3, p); |
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856 *failures = true; |
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857 return; |
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858 } |
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859 } |
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860 |
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861 // Loook up end - 1 |
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862 HeapWord* addr_4 = the_end - 1; |
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863 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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864 if (b_start_4 != p) { |
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865 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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866 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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867 addr_4, b_start_4, p); |
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868 *failures = true; |
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869 return; |
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870 } |
342 | 871 } |
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872 |
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873 if (is_humongous && object_num > 1) { |
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874 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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875 "but has "SIZE_FORMAT", objects", |
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876 bottom(), end(), object_num); |
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877 *failures = true; |
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878 return; |
342 | 879 } |
880 } | |
881 | |
882 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
883 // away eventually. | |
884 | |
356 | 885 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
342 | 886 // false ==> we'll do the clearing if there's clearing to be done. |
356 | 887 ContiguousSpace::initialize(mr, false, mangle_space); |
342 | 888 _offsets.zero_bottom_entry(); |
889 _offsets.initialize_threshold(); | |
356 | 890 if (clear_space) clear(mangle_space); |
342 | 891 } |
892 | |
356 | 893 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
894 ContiguousSpace::clear(mangle_space); | |
342 | 895 _offsets.zero_bottom_entry(); |
896 _offsets.initialize_threshold(); | |
897 } | |
898 | |
899 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
900 Space::set_bottom(new_bottom); | |
901 _offsets.set_bottom(new_bottom); | |
902 } | |
903 | |
904 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
905 Space::set_end(new_end); | |
906 _offsets.resize(new_end - bottom()); | |
907 } | |
908 | |
909 void G1OffsetTableContigSpace::print() const { | |
910 print_short(); | |
911 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
912 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
913 bottom(), top(), _offsets.threshold(), end()); | |
914 } | |
915 | |
916 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
917 return _offsets.initialize_threshold(); | |
918 } | |
919 | |
920 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
921 HeapWord* end) { | |
922 _offsets.alloc_block(start, end); | |
923 return _offsets.threshold(); | |
924 } | |
925 | |
926 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
927 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
928 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
929 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
930 return top(); | |
931 else | |
932 return ContiguousSpace::saved_mark_word(); | |
933 } | |
934 | |
935 void G1OffsetTableContigSpace::set_saved_mark() { | |
936 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
937 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
938 | |
939 if (_gc_time_stamp < curr_gc_time_stamp) { | |
940 // The order of these is important, as another thread might be | |
941 // about to start scanning this region. If it does so after | |
942 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
943 // will be false, and it will pick up top() as the high water mark | |
944 // of region. If it does so after _gc_time_stamp = ..., then it | |
945 // will pick up the right saved_mark_word() as the high water mark | |
946 // of the region. Either way, the behaviour will be correct. | |
947 ContiguousSpace::set_saved_mark(); | |
845
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948 OrderAccess::storestore(); |
353
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diff
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949 _gc_time_stamp = curr_gc_time_stamp; |
2433
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950 // No need to do another barrier to flush the writes above. If |
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951 // this is called in parallel with other threads trying to |
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952 // allocate into the region, the caller should call this while |
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953 // holding a lock and when the lock is released the writes will be |
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954 // flushed. |
342 | 955 } |
956 } | |
957 | |
958 G1OffsetTableContigSpace:: | |
959 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
960 MemRegion mr, bool is_zeroed) : | |
961 _offsets(sharedOffsetArray, mr), | |
962 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
963 _gc_time_stamp(0) | |
964 { | |
965 _offsets.set_space(this); | |
356 | 966 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
342 | 967 } |