Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 5935:a735aec54ea4
7123170: JCK vm/jvmti/ResourceExhausted/resexh001/resexh00101/ tests fails since 7u4 b02
Summary: The JVMTI ResourceExhausted events must be generated in all places where OOME is thrown
Reviewed-by: acorn, coleenp, dcubed, dholmes, dsamersoff, jwilhelm, tonyp
Contributed-by: serguei.spitsyn@oracle.com
author | sspitsyn |
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date | Wed, 14 Mar 2012 20:06:48 -0700 |
parents | a9647476d1a4 |
children | 33df1aeaebbf b632e80fc9dc |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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> |
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98 void do_oop_work(T* p) { |
342 | 99 assert(_containing_obj != NULL, "Precondition"); |
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100 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), |
811 | 101 "Precondition"); |
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102 T heap_oop = oopDesc::load_heap_oop(p); |
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103 if (!oopDesc::is_null(heap_oop)) { |
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104 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 105 bool failed = false; |
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106 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { |
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107 MutexLockerEx x(ParGCRareEvent_lock, |
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108 Mutex::_no_safepoint_check_flag); |
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109 |
342 | 110 if (!_failures) { |
111 gclog_or_tty->print_cr(""); | |
112 gclog_or_tty->print_cr("----------"); | |
113 } | |
114 if (!_g1h->is_in_closed_subset(obj)) { | |
1388 | 115 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
342 | 116 gclog_or_tty->print_cr("Field "PTR_FORMAT |
1388 | 117 " of live obj "PTR_FORMAT" in region " |
118 "["PTR_FORMAT", "PTR_FORMAT")", | |
119 p, (void*) _containing_obj, | |
120 from->bottom(), from->end()); | |
121 print_object(gclog_or_tty, _containing_obj); | |
122 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
123 (void*) obj); | |
124 } else { | |
125 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
126 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
127 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
128 " of live obj "PTR_FORMAT" in region " | |
129 "["PTR_FORMAT", "PTR_FORMAT")", | |
130 p, (void*) _containing_obj, | |
131 from->bottom(), from->end()); | |
132 print_object(gclog_or_tty, _containing_obj); | |
133 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
134 "["PTR_FORMAT", "PTR_FORMAT")", | |
135 (void*) obj, to->bottom(), to->end()); | |
136 print_object(gclog_or_tty, obj); | |
342 | 137 } |
138 gclog_or_tty->print_cr("----------"); | |
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139 gclog_or_tty->flush(); |
342 | 140 _failures = true; |
141 failed = true; | |
142 _n_failures++; | |
143 } | |
144 | |
145 if (!_g1h->full_collection()) { | |
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146 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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147 HeapRegion* to = _g1h->heap_region_containing(obj); |
342 | 148 if (from != NULL && to != NULL && |
149 from != to && | |
150 !to->isHumongous()) { | |
151 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
152 jbyte cv_field = *_bs->byte_for_const(p); | |
153 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
154 | |
155 bool is_bad = !(from->is_young() | |
156 || to->rem_set()->contains_reference(p) | |
157 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
158 (_containing_obj->is_objArray() ? | |
159 cv_field == dirty | |
160 : cv_obj == dirty || cv_field == dirty)); | |
161 if (is_bad) { | |
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162 MutexLockerEx x(ParGCRareEvent_lock, |
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163 Mutex::_no_safepoint_check_flag); |
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164 |
342 | 165 if (!_failures) { |
166 gclog_or_tty->print_cr(""); | |
167 gclog_or_tty->print_cr("----------"); | |
168 } | |
169 gclog_or_tty->print_cr("Missing rem set entry:"); | |
3766 | 170 gclog_or_tty->print_cr("Field "PTR_FORMAT" " |
171 "of obj "PTR_FORMAT", " | |
172 "in region "HR_FORMAT, | |
173 p, (void*) _containing_obj, | |
174 HR_FORMAT_PARAMS(from)); | |
342 | 175 _containing_obj->print_on(gclog_or_tty); |
3766 | 176 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " |
177 "in region "HR_FORMAT, | |
178 (void*) obj, | |
179 HR_FORMAT_PARAMS(to)); | |
342 | 180 obj->print_on(gclog_or_tty); |
181 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
182 cv_obj, cv_field); | |
183 gclog_or_tty->print_cr("----------"); | |
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184 gclog_or_tty->flush(); |
342 | 185 _failures = true; |
186 if (!failed) _n_failures++; | |
187 } | |
188 } | |
189 } | |
190 } | |
191 } | |
192 }; | |
193 | |
194 template<class ClosureType> | |
195 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
196 HeapRegion* hr, | |
197 HeapWord* cur, HeapWord* top) { | |
198 oop cur_oop = oop(cur); | |
199 int oop_size = cur_oop->size(); | |
200 HeapWord* next_obj = cur + oop_size; | |
201 while (next_obj < top) { | |
202 // Keep filtering the remembered set. | |
203 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
204 // Bottom lies entirely below top, so we can call the | |
205 // non-memRegion version of oop_iterate below. | |
206 cur_oop->oop_iterate(cl); | |
207 } | |
208 cur = next_obj; | |
209 cur_oop = oop(cur); | |
210 oop_size = cur_oop->size(); | |
211 next_obj = cur + oop_size; | |
212 } | |
213 return cur; | |
214 } | |
215 | |
216 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
217 HeapWord* bottom, | |
218 HeapWord* top, | |
219 OopClosure* cl) { | |
220 G1CollectedHeap* g1h = _g1; | |
221 int oop_size; | |
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222 OopClosure* cl2 = NULL; |
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223 |
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224 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
342 | 225 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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226 |
342 | 227 switch (_fk) { |
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228 case NoFilterKind: cl2 = cl; break; |
342 | 229 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
230 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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231 default: ShouldNotReachHere(); |
342 | 232 } |
233 | |
234 // Start filtering what we add to the remembered set. If the object is | |
235 // not considered dead, either because it is marked (in the mark bitmap) | |
236 // or it was allocated after marking finished, then we add it. Otherwise | |
237 // we can safely ignore the object. | |
238 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
239 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
240 } else { | |
241 oop_size = oop(bottom)->size(); | |
242 } | |
243 | |
244 bottom += oop_size; | |
245 | |
246 if (bottom < top) { | |
247 // We replicate the loop below for several kinds of possible filters. | |
248 switch (_fk) { | |
249 case NoFilterKind: | |
250 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
251 break; | |
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252 |
342 | 253 case IntoCSFilterKind: { |
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254 FilterIntoCSClosure filt(this, g1h, cl); |
342 | 255 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
256 break; | |
257 } | |
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258 |
342 | 259 case OutOfRegionFilterKind: { |
260 FilterOutOfRegionClosure filt(_hr, cl); | |
261 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
262 break; | |
263 } | |
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264 |
342 | 265 default: |
266 ShouldNotReachHere(); | |
267 } | |
268 | |
269 // Last object. Need to do dead-obj filtering here too. | |
270 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
271 oop(bottom)->oop_iterate(cl2, mr); | |
272 } | |
273 } | |
274 } | |
275 | |
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276 // Minimum region size; we won't go lower than that. |
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277 // We might want to decrease this in the future, to deal with small |
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278 // heaps a bit more efficiently. |
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279 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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280 |
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281 // Maximum region size; we don't go higher than that. There's a good |
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282 // reason for having an upper bound. We don't want regions to get too |
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283 // large, otherwise cleanup's effectiveness would decrease as there |
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284 // will be fewer opportunities to find totally empty regions after |
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285 // marking. |
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286 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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287 |
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288 // The automatic region size calculation will try to have around this |
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289 // many regions in the heap (based on the min heap size). |
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290 #define TARGET_REGION_NUMBER 2048 |
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291 |
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292 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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293 // region_size in bytes |
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294 uintx region_size = G1HeapRegionSize; |
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295 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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296 // We base the automatic calculation on the min heap size. This |
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297 // can be problematic if the spread between min and max is quite |
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298 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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299 // the max size, the region size might be way too large for the |
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300 // min size. Either way, some users might have to set the region |
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301 // size manually for some -Xms / -Xmx combos. |
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302 |
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303 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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304 (uintx) MIN_REGION_SIZE); |
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305 } |
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306 |
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307 int region_size_log = log2_long((jlong) region_size); |
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308 // Recalculate the region size to make sure it's a power of |
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309 // 2. This means that region_size is the largest power of 2 that's |
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310 // <= what we've calculated so far. |
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311 region_size = ((uintx)1 << region_size_log); |
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312 |
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313 // Now make sure that we don't go over or under our limits. |
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314 if (region_size < MIN_REGION_SIZE) { |
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315 region_size = MIN_REGION_SIZE; |
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316 } else if (region_size > MAX_REGION_SIZE) { |
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317 region_size = MAX_REGION_SIZE; |
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318 } |
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319 |
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320 // And recalculate the log. |
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321 region_size_log = log2_long((jlong) region_size); |
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322 |
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323 // Now, set up the globals. |
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324 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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325 LogOfHRGrainBytes = region_size_log; |
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326 |
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327 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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328 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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329 |
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330 guarantee(GrainBytes == 0, "we should only set it once"); |
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331 // The cast to int is safe, given that we've bounded region_size by |
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332 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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333 GrainBytes = (size_t)region_size; |
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334 |
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335 guarantee(GrainWords == 0, "we should only set it once"); |
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336 GrainWords = GrainBytes >> LogHeapWordSize; |
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337 guarantee((size_t)(1 << LogOfHRGrainWords) == GrainWords, "sanity"); |
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338 |
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339 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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340 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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341 } |
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342 |
342 | 343 void HeapRegion::reset_after_compaction() { |
344 G1OffsetTableContigSpace::reset_after_compaction(); | |
345 // After a compaction the mark bitmap is invalid, so we must | |
346 // treat all objects as being inside the unmarked area. | |
347 zero_marked_bytes(); | |
348 init_top_at_mark_start(); | |
349 } | |
350 | |
351 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
2152 | 352 assert(_humongous_type == NotHumongous, |
353 "we should have already filtered out humongous regions"); | |
354 assert(_humongous_start_region == NULL, | |
355 "we should have already filtered out humongous regions"); | |
356 assert(_end == _orig_end, | |
357 "we should have already filtered out humongous regions"); | |
358 | |
342 | 359 _in_collection_set = false; |
360 | |
361 set_young_index_in_cset(-1); | |
362 uninstall_surv_rate_group(); | |
363 set_young_type(NotYoung); | |
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364 reset_pre_dummy_top(); |
342 | 365 |
366 if (!par) { | |
367 // If this is parallel, this will be done later. | |
368 HeapRegionRemSet* hrrs = rem_set(); | |
369 if (hrrs != NULL) hrrs->clear(); | |
355 | 370 _claimed = InitialClaimValue; |
342 | 371 } |
372 zero_marked_bytes(); | |
373 set_sort_index(-1); | |
374 | |
375 _offsets.resize(HeapRegion::GrainWords); | |
376 init_top_at_mark_start(); | |
356 | 377 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 378 } |
379 | |
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380 void HeapRegion::par_clear() { |
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381 assert(used() == 0, "the region should have been already cleared"); |
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382 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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383 HeapRegionRemSet* hrrs = rem_set(); |
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384 hrrs->clear(); |
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385 CardTableModRefBS* ct_bs = |
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386 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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387 ct_bs->clear(MemRegion(bottom(), end())); |
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388 } |
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389 |
342 | 390 void HeapRegion::calc_gc_efficiency() { |
391 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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392 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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393 _gc_efficiency = (double) reclaimable_bytes() / |
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394 g1p->predict_region_elapsed_time_ms(this, false); |
342 | 395 } |
396 | |
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397 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 398 assert(!isHumongous(), "sanity / pre-condition"); |
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399 assert(end() == _orig_end, |
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400 "Should be normal before the humongous object allocation"); |
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401 assert(top() == bottom(), "should be empty"); |
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402 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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403 |
355 | 404 _humongous_type = StartsHumongous; |
342 | 405 _humongous_start_region = this; |
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406 |
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407 set_end(new_end); |
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408 _offsets.set_for_starts_humongous(new_top); |
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409 } |
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410 |
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411 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 412 assert(!isHumongous(), "sanity / pre-condition"); |
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413 assert(end() == _orig_end, |
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414 "Should be normal before the humongous object allocation"); |
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415 assert(top() == bottom(), "should be empty"); |
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416 assert(first_hr->startsHumongous(), "pre-condition"); |
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417 |
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418 _humongous_type = ContinuesHumongous; |
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419 _humongous_start_region = first_hr; |
342 | 420 } |
421 | |
2152 | 422 void HeapRegion::set_notHumongous() { |
423 assert(isHumongous(), "pre-condition"); | |
424 | |
425 if (startsHumongous()) { | |
426 assert(top() <= end(), "pre-condition"); | |
427 set_end(_orig_end); | |
428 if (top() > end()) { | |
429 // at least one "continues humongous" region after it | |
430 set_top(end()); | |
431 } | |
432 } else { | |
433 // continues humongous | |
434 assert(end() == _orig_end, "sanity"); | |
435 } | |
436 | |
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437 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
2152 | 438 _humongous_type = NotHumongous; |
439 _humongous_start_region = NULL; | |
440 } | |
441 | |
342 | 442 bool HeapRegion::claimHeapRegion(jint claimValue) { |
443 jint current = _claimed; | |
444 if (current != claimValue) { | |
445 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
446 if (res == current) { | |
447 return true; | |
448 } | |
449 } | |
450 return false; | |
451 } | |
452 | |
453 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
454 HeapWord* low = addr; | |
455 HeapWord* high = end(); | |
456 while (low < high) { | |
457 size_t diff = pointer_delta(high, low); | |
458 // Must add one below to bias toward the high amount. Otherwise, if | |
459 // "high" were at the desired value, and "low" were one less, we | |
460 // would not converge on "high". This is not symmetric, because | |
461 // we set "high" to a block start, which might be the right one, | |
462 // which we don't do for "low". | |
463 HeapWord* middle = low + (diff+1)/2; | |
464 if (middle == high) return high; | |
465 HeapWord* mid_bs = block_start_careful(middle); | |
466 if (mid_bs < addr) { | |
467 low = middle; | |
468 } else { | |
469 high = mid_bs; | |
470 } | |
471 } | |
472 assert(low == high && low >= addr, "Didn't work."); | |
473 return low; | |
474 } | |
475 | |
356 | 476 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
477 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
342 | 478 hr_clear(false/*par*/, clear_space); |
479 } | |
480 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
481 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
482 #endif // _MSC_VER | |
483 | |
484 | |
485 HeapRegion:: | |
3766 | 486 HeapRegion(size_t hrs_index, G1BlockOffsetSharedArray* sharedOffsetArray, |
487 MemRegion mr, bool is_zeroed) | |
342 | 488 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), |
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489 _hrs_index(hrs_index), |
355 | 490 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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491 _in_collection_set(false), |
342 | 492 _next_in_special_set(NULL), _orig_end(NULL), |
355 | 493 _claimed(InitialClaimValue), _evacuation_failed(false), |
342 | 494 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
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495 _gc_efficiency(0.0), |
342 | 496 _young_type(NotYoung), _next_young_region(NULL), |
2152 | 497 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
498 #ifdef ASSERT | |
499 _containing_set(NULL), | |
500 #endif // ASSERT | |
501 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
502 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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503 _predicted_bytes_to_copy(0) |
342 | 504 { |
505 _orig_end = mr.end(); | |
506 // Note that initialize() will set the start of the unmarked area of the | |
507 // region. | |
356 | 508 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
509 set_top(bottom()); | |
510 set_saved_mark(); | |
342 | 511 |
512 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
513 | |
514 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
515 // In case the region is allocated during a pause, note the top. | |
516 // We haven't done any counting on a brand new region. | |
517 _top_at_conc_mark_count = bottom(); | |
518 } | |
519 | |
520 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
521 const HeapRegion* _target; | |
522 bool _target_seen; | |
523 HeapRegion* _last; | |
524 CompactibleSpace* _res; | |
525 public: | |
526 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
527 _target(target), _target_seen(false), _res(NULL) {} | |
528 bool doHeapRegion(HeapRegion* cur) { | |
529 if (_target_seen) { | |
530 if (!cur->isHumongous()) { | |
531 _res = cur; | |
532 return true; | |
533 } | |
534 } else if (cur == _target) { | |
535 _target_seen = true; | |
536 } | |
537 return false; | |
538 } | |
539 CompactibleSpace* result() { return _res; } | |
540 }; | |
541 | |
542 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
543 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
544 // cast away const-ness | |
545 HeapRegion* r = (HeapRegion*) this; | |
546 NextCompactionHeapRegionClosure blk(r); | |
547 g1h->heap_region_iterate_from(r, &blk); | |
548 return blk.result(); | |
549 } | |
550 | |
551 void HeapRegion::save_marks() { | |
552 set_saved_mark(); | |
553 } | |
554 | |
555 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
556 HeapWord* p = mr.start(); | |
557 HeapWord* e = mr.end(); | |
558 oop obj; | |
559 while (p < e) { | |
560 obj = oop(p); | |
561 p += obj->oop_iterate(cl); | |
562 } | |
563 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
564 } | |
565 | |
566 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
567 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
568 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
569 } | |
570 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
571 | |
572 | |
573 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
574 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
575 } | |
576 | |
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577 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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578 bool during_conc_mark) { |
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579 // We always recreate the prev marking info and we'll explicitly |
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580 // mark all objects we find to be self-forwarded on the prev |
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581 // bitmap. So all objects need to be below PTAMS. |
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582 _prev_top_at_mark_start = top(); |
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583 _prev_marked_bytes = 0; |
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584 |
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585 if (during_initial_mark) { |
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586 // During initial-mark, we'll also explicitly mark all objects |
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587 // we find to be self-forwarded on the next bitmap. So all |
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588 // objects need to be below NTAMS. |
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589 _next_top_at_mark_start = top(); |
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590 set_top_at_conc_mark_count(bottom()); |
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591 _next_marked_bytes = 0; |
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592 } else if (during_conc_mark) { |
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593 // During concurrent mark, all objects in the CSet (including |
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594 // the ones we find to be self-forwarded) are implicitly live. |
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595 // So all objects need to be above NTAMS. |
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596 _next_top_at_mark_start = bottom(); |
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597 set_top_at_conc_mark_count(bottom()); |
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598 _next_marked_bytes = 0; |
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599 } |
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600 } |
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601 |
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602 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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603 bool during_conc_mark, |
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604 size_t marked_bytes) { |
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605 assert(0 <= marked_bytes && marked_bytes <= used(), |
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606 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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607 marked_bytes, used())); |
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608 _prev_marked_bytes = marked_bytes; |
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609 } |
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610 |
342 | 611 HeapWord* |
612 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
613 ObjectClosure* cl) { | |
614 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
615 // We used to use "block_start_careful" here. But we're actually happy | |
616 // to update the BOT while we do this... | |
617 HeapWord* cur = block_start(mr.start()); | |
618 mr = mr.intersection(used_region()); | |
619 if (mr.is_empty()) return NULL; | |
620 // Otherwise, find the obj that extends onto mr.start(). | |
621 | |
622 assert(cur <= mr.start() | |
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623 && (oop(cur)->klass_or_null() == NULL || |
342 | 624 cur + oop(cur)->size() > mr.start()), |
625 "postcondition of block_start"); | |
626 oop obj; | |
627 while (cur < mr.end()) { | |
628 obj = oop(cur); | |
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629 if (obj->klass_or_null() == NULL) { |
342 | 630 // Ran into an unparseable point. |
631 return cur; | |
632 } else if (!g1h->is_obj_dead(obj)) { | |
633 cl->do_object(obj); | |
634 } | |
635 if (cl->abort()) return cur; | |
636 // The check above must occur before the operation below, since an | |
637 // abort might invalidate the "size" operation. | |
638 cur += obj->size(); | |
639 } | |
640 return NULL; | |
641 } | |
642 | |
643 HeapWord* | |
644 HeapRegion:: | |
645 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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646 FilterOutOfRegionClosure* cl, |
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647 bool filter_young, |
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648 jbyte* card_ptr) { |
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649 // Currently, we should only have to clean the card if filter_young |
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650 // is true and vice versa. |
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651 if (filter_young) { |
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652 assert(card_ptr != NULL, "pre-condition"); |
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653 } else { |
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654 assert(card_ptr == NULL, "pre-condition"); |
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655 } |
342 | 656 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
657 | |
658 // If we're within a stop-world GC, then we might look at a card in a | |
659 // GC alloc region that extends onto a GC LAB, which may not be | |
660 // parseable. Stop such at the "saved_mark" of the region. | |
4839 | 661 if (g1h->is_gc_active()) { |
342 | 662 mr = mr.intersection(used_region_at_save_marks()); |
663 } else { | |
664 mr = mr.intersection(used_region()); | |
665 } | |
666 if (mr.is_empty()) return NULL; | |
667 // Otherwise, find the obj that extends onto mr.start(). | |
668 | |
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669 // The intersection of the incoming mr (for the card) and the |
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670 // allocated part of the region is non-empty. This implies that |
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671 // we have actually allocated into this region. The code in |
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672 // G1CollectedHeap.cpp that allocates a new region sets the |
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673 // is_young tag on the region before allocating. Thus we |
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674 // safely know if this region is young. |
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675 if (is_young() && filter_young) { |
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676 return NULL; |
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677 } |
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678 |
1705 | 679 assert(!is_young(), "check value of filter_young"); |
680 | |
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681 // We can only clean the card here, after we make the decision that |
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682 // the card is not young. And we only clean the card if we have been |
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683 // asked to (i.e., card_ptr != NULL). |
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684 if (card_ptr != NULL) { |
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685 *card_ptr = CardTableModRefBS::clean_card_val(); |
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686 // We must complete this write before we do any of the reads below. |
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687 OrderAccess::storeload(); |
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688 } |
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689 |
4839 | 690 // Cache the boundaries of the memory region in some const locals |
691 HeapWord* const start = mr.start(); | |
692 HeapWord* const end = mr.end(); | |
693 | |
342 | 694 // We used to use "block_start_careful" here. But we're actually happy |
695 // to update the BOT while we do this... | |
4839 | 696 HeapWord* cur = block_start(start); |
697 assert(cur <= start, "Postcondition"); | |
698 | |
699 oop obj; | |
342 | 700 |
4839 | 701 HeapWord* next = cur; |
702 while (next <= start) { | |
703 cur = next; | |
704 obj = oop(cur); | |
705 if (obj->klass_or_null() == NULL) { | |
342 | 706 // Ran into an unparseable point. |
707 return cur; | |
708 } | |
709 // Otherwise... | |
4839 | 710 next = (cur + obj->size()); |
342 | 711 } |
4839 | 712 |
713 // If we finish the above loop...We have a parseable object that | |
714 // begins on or before the start of the memory region, and ends | |
715 // inside or spans the entire region. | |
716 | |
717 assert(obj == oop(cur), "sanity"); | |
718 assert(cur <= start && | |
719 obj->klass_or_null() != NULL && | |
720 (cur + obj->size()) > start, | |
342 | 721 "Loop postcondition"); |
4839 | 722 |
342 | 723 if (!g1h->is_obj_dead(obj)) { |
724 obj->oop_iterate(cl, mr); | |
725 } | |
726 | |
4839 | 727 while (cur < end) { |
342 | 728 obj = oop(cur); |
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729 if (obj->klass_or_null() == NULL) { |
342 | 730 // Ran into an unparseable point. |
731 return cur; | |
732 }; | |
4839 | 733 |
342 | 734 // Otherwise: |
735 next = (cur + obj->size()); | |
4839 | 736 |
342 | 737 if (!g1h->is_obj_dead(obj)) { |
4839 | 738 if (next < end || !obj->is_objArray()) { |
739 // This object either does not span the MemRegion | |
740 // boundary, or if it does it's not an array. | |
741 // Apply closure to whole object. | |
342 | 742 obj->oop_iterate(cl); |
743 } else { | |
4839 | 744 // This obj is an array that spans the boundary. |
745 // Stop at the boundary. | |
746 obj->oop_iterate(cl, mr); | |
342 | 747 } |
748 } | |
749 cur = next; | |
750 } | |
751 return NULL; | |
752 } | |
753 | |
754 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
755 void HeapRegion::print_on(outputStream* st) const { | |
756 if (isHumongous()) { | |
757 if (startsHumongous()) | |
758 st->print(" HS"); | |
759 else | |
760 st->print(" HC"); | |
761 } else { | |
762 st->print(" "); | |
763 } | |
764 if (in_collection_set()) | |
765 st->print(" CS"); | |
766 else | |
767 st->print(" "); | |
768 if (is_young()) | |
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769 st->print(is_survivor() ? " SU" : " Y "); |
342 | 770 else |
771 st->print(" "); | |
772 if (is_empty()) | |
773 st->print(" F"); | |
774 else | |
775 st->print(" "); | |
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776 st->print(" TS %5d", _gc_time_stamp); |
1388 | 777 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
778 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 779 G1OffsetTableContigSpace::print_on(st); |
780 } | |
781 | |
811 | 782 void HeapRegion::verify(bool allow_dirty) const { |
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783 bool dummy = false; |
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784 verify(allow_dirty, VerifyOption_G1UsePrevMarking, /* failures */ &dummy); |
811 | 785 } |
786 | |
342 | 787 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
788 // We would need a mechanism to make that code skip dead objects. | |
789 | |
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790 void HeapRegion::verify(bool allow_dirty, |
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791 VerifyOption vo, |
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792 bool* failures) const { |
342 | 793 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
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794 *failures = false; |
342 | 795 HeapWord* p = bottom(); |
796 HeapWord* prev_p = NULL; | |
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797 VerifyLiveClosure vl_cl(g1, vo); |
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798 bool is_humongous = isHumongous(); |
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799 bool do_bot_verify = !is_young(); |
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800 size_t object_num = 0; |
342 | 801 while (p < top()) { |
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802 oop obj = oop(p); |
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803 size_t obj_size = obj->size(); |
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804 object_num += 1; |
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805 |
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|
806 if (is_humongous != g1->isHumongous(obj_size)) { |
1718
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807 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
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|
808 SIZE_FORMAT" words) in a %shumongous region", |
2133
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809 p, g1->isHumongous(obj_size) ? "" : "non-", |
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810 obj_size, is_humongous ? "" : "non-"); |
1718
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811 *failures = true; |
2133
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diff
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|
812 return; |
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|
813 } |
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|
814 |
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diff
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815 // If it returns false, verify_for_object() will output the |
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816 // appropriate messasge. |
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817 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
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818 *failures = true; |
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819 return; |
1718
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820 } |
2133
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|
821 |
3772
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johnc
parents:
3766
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822 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
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823 if (obj->is_oop()) { |
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824 klassOop klass = obj->klass(); |
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825 if (!klass->is_perm()) { |
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826 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
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827 "not in perm", klass, obj); |
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828 *failures = true; |
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|
829 return; |
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|
830 } else if (!klass->is_klass()) { |
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831 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
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|
832 "not a klass", klass, obj); |
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|
833 *failures = true; |
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|
834 return; |
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diff
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|
835 } else { |
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|
836 vl_cl.set_containing_obj(obj); |
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|
837 obj->oop_iterate(&vl_cl); |
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1972
diff
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|
838 if (vl_cl.failures()) { |
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parents:
1972
diff
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|
839 *failures = true; |
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diff
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|
840 } |
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841 if (G1MaxVerifyFailures >= 0 && |
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diff
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842 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
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diff
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|
843 return; |
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parents:
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diff
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|
844 } |
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|
845 } |
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|
846 } else { |
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|
847 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
1020
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diff
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|
848 *failures = true; |
ff2402f6a50b
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parents:
942
diff
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|
849 return; |
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parents:
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diff
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|
850 } |
342 | 851 } |
852 prev_p = p; | |
2133
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|
853 p += obj_size; |
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parents:
1972
diff
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|
854 } |
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|
855 |
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1972
diff
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|
856 if (p != top()) { |
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1972
diff
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|
857 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
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diff
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|
858 "does not match top "PTR_FORMAT, p, top()); |
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parents:
1972
diff
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|
859 *failures = true; |
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parents:
1972
diff
changeset
|
860 return; |
342 | 861 } |
2133
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1972
diff
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|
862 |
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1972
diff
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|
863 HeapWord* the_end = end(); |
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1972
diff
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|
864 assert(p == top(), "it should still hold"); |
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1972
diff
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|
865 // Do some extra BOT consistency checking for addresses in the |
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parents:
1972
diff
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|
866 // range [top, end). BOT look-ups in this range should yield |
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diff
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|
867 // top. No point in doing that if top == end (there's nothing there). |
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1972
diff
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|
868 if (p < the_end) { |
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parents:
1972
diff
changeset
|
869 // Look up top |
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diff
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|
870 HeapWord* addr_1 = p; |
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diff
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|
871 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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|
872 if (b_start_1 != p) { |
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diff
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|
873 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
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1972
diff
changeset
|
874 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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parents:
1972
diff
changeset
|
875 addr_1, b_start_1, p); |
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diff
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|
876 *failures = true; |
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parents:
1972
diff
changeset
|
877 return; |
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parents:
1972
diff
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|
878 } |
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diff
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|
879 |
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parents:
1972
diff
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|
880 // Look up top + 1 |
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diff
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|
881 HeapWord* addr_2 = p + 1; |
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diff
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|
882 if (addr_2 < the_end) { |
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|
883 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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diff
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|
884 if (b_start_2 != p) { |
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diff
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|
885 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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1972
diff
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|
886 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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diff
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|
887 addr_2, b_start_2, p); |
1020
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parents:
942
diff
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|
888 *failures = true; |
ff2402f6a50b
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tonyp
parents:
942
diff
changeset
|
889 return; |
2133
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parents:
1972
diff
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|
890 } |
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diff
changeset
|
891 } |
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parents:
1972
diff
changeset
|
892 |
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1972
diff
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|
893 // Look up an address between top and end |
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diff
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|
894 size_t diff = pointer_delta(the_end, p) / 2; |
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diff
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|
895 HeapWord* addr_3 = p + diff; |
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parents:
1972
diff
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|
896 if (addr_3 < the_end) { |
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|
897 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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1972
diff
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|
898 if (b_start_3 != p) { |
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diff
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|
899 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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tonyp
parents:
1972
diff
changeset
|
900 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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parents:
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diff
changeset
|
901 addr_3, b_start_3, p); |
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parents:
1972
diff
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|
902 *failures = true; |
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tonyp
parents:
1972
diff
changeset
|
903 return; |
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tonyp
parents:
1972
diff
changeset
|
904 } |
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tonyp
parents:
1972
diff
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|
905 } |
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tonyp
parents:
1972
diff
changeset
|
906 |
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parents:
1972
diff
changeset
|
907 // Loook up end - 1 |
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1972
diff
changeset
|
908 HeapWord* addr_4 = the_end - 1; |
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diff
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|
909 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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1972
diff
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|
910 if (b_start_4 != p) { |
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diff
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|
911 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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1972
diff
changeset
|
912 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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parents:
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diff
changeset
|
913 addr_4, b_start_4, p); |
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parents:
1972
diff
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|
914 *failures = true; |
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parents:
1972
diff
changeset
|
915 return; |
1020
ff2402f6a50b
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parents:
942
diff
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|
916 } |
342 | 917 } |
1020
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parents:
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diff
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|
918 |
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
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parents:
1705
diff
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|
919 if (is_humongous && object_num > 1) { |
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
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|
920 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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parents:
1705
diff
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|
921 "but has "SIZE_FORMAT", objects", |
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tonyp
parents:
1705
diff
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|
922 bottom(), end(), object_num); |
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parents:
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diff
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|
923 *failures = true; |
1020
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|
924 return; |
342 | 925 } |
926 } | |
927 | |
928 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
929 // away eventually. | |
930 | |
356 | 931 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
342 | 932 // false ==> we'll do the clearing if there's clearing to be done. |
356 | 933 ContiguousSpace::initialize(mr, false, mangle_space); |
342 | 934 _offsets.zero_bottom_entry(); |
935 _offsets.initialize_threshold(); | |
356 | 936 if (clear_space) clear(mangle_space); |
342 | 937 } |
938 | |
356 | 939 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
940 ContiguousSpace::clear(mangle_space); | |
342 | 941 _offsets.zero_bottom_entry(); |
942 _offsets.initialize_threshold(); | |
943 } | |
944 | |
945 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
946 Space::set_bottom(new_bottom); | |
947 _offsets.set_bottom(new_bottom); | |
948 } | |
949 | |
950 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
951 Space::set_end(new_end); | |
952 _offsets.resize(new_end - bottom()); | |
953 } | |
954 | |
955 void G1OffsetTableContigSpace::print() const { | |
956 print_short(); | |
957 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
958 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
959 bottom(), top(), _offsets.threshold(), end()); | |
960 } | |
961 | |
962 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
963 return _offsets.initialize_threshold(); | |
964 } | |
965 | |
966 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
967 HeapWord* end) { | |
968 _offsets.alloc_block(start, end); | |
969 return _offsets.threshold(); | |
970 } | |
971 | |
972 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
973 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
974 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
975 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
976 return top(); | |
977 else | |
978 return ContiguousSpace::saved_mark_word(); | |
979 } | |
980 | |
981 void G1OffsetTableContigSpace::set_saved_mark() { | |
982 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
983 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
984 | |
985 if (_gc_time_stamp < curr_gc_time_stamp) { | |
986 // The order of these is important, as another thread might be | |
987 // about to start scanning this region. If it does so after | |
988 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
989 // will be false, and it will pick up top() as the high water mark | |
990 // of region. If it does so after _gc_time_stamp = ..., then it | |
991 // will pick up the right saved_mark_word() as the high water mark | |
992 // of the region. Either way, the behaviour will be correct. | |
993 ContiguousSpace::set_saved_mark(); | |
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994 OrderAccess::storestore(); |
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995 _gc_time_stamp = curr_gc_time_stamp; |
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996 // No need to do another barrier to flush the writes above. If |
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997 // this is called in parallel with other threads trying to |
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998 // allocate into the region, the caller should call this while |
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999 // holding a lock and when the lock is released the writes will be |
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1000 // flushed. |
342 | 1001 } |
1002 } | |
1003 | |
1004 G1OffsetTableContigSpace:: | |
1005 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
1006 MemRegion mr, bool is_zeroed) : | |
1007 _offsets(sharedOffsetArray, mr), | |
1008 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
1009 _gc_time_stamp(0) | |
1010 { | |
1011 _offsets.set_space(this); | |
356 | 1012 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
342 | 1013 } |