Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 12035:33d39b75663f
Merge
author | ehelin |
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date | Thu, 15 Aug 2013 06:20:48 -0700 |
parents | dae8324fc7d1 |
children | 3cce976666d9 5888334c9c24 |
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, |
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43 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 44 CardTableModRefBS::PrecisionStyle precision, |
45 FilterKind fk) : | |
46 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
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47 _hr(hr), _fk(fk), _g1(g1) { } |
342 | 48 |
49 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
50 OopClosure* oc) : | |
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51 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
342 | 52 |
53 class VerifyLiveClosure: public OopClosure { | |
811 | 54 private: |
342 | 55 G1CollectedHeap* _g1h; |
56 CardTableModRefBS* _bs; | |
57 oop _containing_obj; | |
58 bool _failures; | |
59 int _n_failures; | |
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60 VerifyOption _vo; |
342 | 61 public: |
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62 // _vo == UsePrevMarking -> use "prev" marking information, |
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63 // _vo == UseNextMarking -> use "next" marking information, |
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64 // _vo == UseMarkWord -> use mark word from object header. |
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65 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : |
342 | 66 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
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67 _failures(false), _n_failures(0), _vo(vo) |
342 | 68 { |
69 BarrierSet* bs = _g1h->barrier_set(); | |
70 if (bs->is_a(BarrierSet::CardTableModRef)) | |
71 _bs = (CardTableModRefBS*)bs; | |
72 } | |
73 | |
74 void set_containing_obj(oop obj) { | |
75 _containing_obj = obj; | |
76 } | |
77 | |
78 bool failures() { return _failures; } | |
79 int n_failures() { return _n_failures; } | |
80 | |
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81 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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82 virtual void do_oop( oop* p) { do_oop_work(p); } |
342 | 83 |
1388 | 84 void print_object(outputStream* out, oop obj) { |
85 #ifdef PRODUCT | |
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86 Klass* k = obj->klass(); |
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87 const char* class_name = InstanceKlass::cast(k)->external_name(); |
1388 | 88 out->print_cr("class name %s", class_name); |
89 #else // PRODUCT | |
90 obj->print_on(out); | |
91 #endif // PRODUCT | |
92 } | |
93 | |
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94 template <class T> |
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95 void do_oop_work(T* p) { |
342 | 96 assert(_containing_obj != NULL, "Precondition"); |
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97 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), |
811 | 98 "Precondition"); |
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99 T heap_oop = oopDesc::load_heap_oop(p); |
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100 if (!oopDesc::is_null(heap_oop)) { |
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101 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
342 | 102 bool failed = false; |
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103 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { |
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104 MutexLockerEx x(ParGCRareEvent_lock, |
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105 Mutex::_no_safepoint_check_flag); |
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106 |
342 | 107 if (!_failures) { |
108 gclog_or_tty->print_cr(""); | |
109 gclog_or_tty->print_cr("----------"); | |
110 } | |
111 if (!_g1h->is_in_closed_subset(obj)) { | |
1388 | 112 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
342 | 113 gclog_or_tty->print_cr("Field "PTR_FORMAT |
1388 | 114 " of live obj "PTR_FORMAT" in region " |
115 "["PTR_FORMAT", "PTR_FORMAT")", | |
116 p, (void*) _containing_obj, | |
117 from->bottom(), from->end()); | |
118 print_object(gclog_or_tty, _containing_obj); | |
119 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
120 (void*) obj); | |
121 } else { | |
122 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
123 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
124 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
125 " of live obj "PTR_FORMAT" in region " | |
126 "["PTR_FORMAT", "PTR_FORMAT")", | |
127 p, (void*) _containing_obj, | |
128 from->bottom(), from->end()); | |
129 print_object(gclog_or_tty, _containing_obj); | |
130 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
131 "["PTR_FORMAT", "PTR_FORMAT")", | |
132 (void*) obj, to->bottom(), to->end()); | |
133 print_object(gclog_or_tty, obj); | |
342 | 134 } |
135 gclog_or_tty->print_cr("----------"); | |
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136 gclog_or_tty->flush(); |
342 | 137 _failures = true; |
138 failed = true; | |
139 _n_failures++; | |
140 } | |
141 | |
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142 if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { |
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143 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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144 HeapRegion* to = _g1h->heap_region_containing(obj); |
342 | 145 if (from != NULL && to != NULL && |
146 from != to && | |
147 !to->isHumongous()) { | |
148 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
149 jbyte cv_field = *_bs->byte_for_const(p); | |
150 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
151 | |
152 bool is_bad = !(from->is_young() | |
153 || to->rem_set()->contains_reference(p) | |
154 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
155 (_containing_obj->is_objArray() ? | |
156 cv_field == dirty | |
157 : cv_obj == dirty || cv_field == dirty)); | |
158 if (is_bad) { | |
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159 MutexLockerEx x(ParGCRareEvent_lock, |
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160 Mutex::_no_safepoint_check_flag); |
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161 |
342 | 162 if (!_failures) { |
163 gclog_or_tty->print_cr(""); | |
164 gclog_or_tty->print_cr("----------"); | |
165 } | |
166 gclog_or_tty->print_cr("Missing rem set entry:"); | |
3766 | 167 gclog_or_tty->print_cr("Field "PTR_FORMAT" " |
168 "of obj "PTR_FORMAT", " | |
169 "in region "HR_FORMAT, | |
170 p, (void*) _containing_obj, | |
171 HR_FORMAT_PARAMS(from)); | |
342 | 172 _containing_obj->print_on(gclog_or_tty); |
3766 | 173 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " |
174 "in region "HR_FORMAT, | |
175 (void*) obj, | |
176 HR_FORMAT_PARAMS(to)); | |
342 | 177 obj->print_on(gclog_or_tty); |
178 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
179 cv_obj, cv_field); | |
180 gclog_or_tty->print_cr("----------"); | |
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181 gclog_or_tty->flush(); |
342 | 182 _failures = true; |
183 if (!failed) _n_failures++; | |
184 } | |
185 } | |
186 } | |
187 } | |
188 } | |
189 }; | |
190 | |
191 template<class ClosureType> | |
192 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
193 HeapRegion* hr, | |
194 HeapWord* cur, HeapWord* top) { | |
195 oop cur_oop = oop(cur); | |
196 int oop_size = cur_oop->size(); | |
197 HeapWord* next_obj = cur + oop_size; | |
198 while (next_obj < top) { | |
199 // Keep filtering the remembered set. | |
200 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
201 // Bottom lies entirely below top, so we can call the | |
202 // non-memRegion version of oop_iterate below. | |
203 cur_oop->oop_iterate(cl); | |
204 } | |
205 cur = next_obj; | |
206 cur_oop = oop(cur); | |
207 oop_size = cur_oop->size(); | |
208 next_obj = cur + oop_size; | |
209 } | |
210 return cur; | |
211 } | |
212 | |
213 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
214 HeapWord* bottom, | |
215 HeapWord* top, | |
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216 ExtendedOopClosure* cl) { |
342 | 217 G1CollectedHeap* g1h = _g1; |
218 int oop_size; | |
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219 ExtendedOopClosure* cl2 = NULL; |
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220 |
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221 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
342 | 222 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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223 |
342 | 224 switch (_fk) { |
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225 case NoFilterKind: cl2 = cl; break; |
342 | 226 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
227 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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228 default: ShouldNotReachHere(); |
342 | 229 } |
230 | |
231 // Start filtering what we add to the remembered set. If the object is | |
232 // not considered dead, either because it is marked (in the mark bitmap) | |
233 // or it was allocated after marking finished, then we add it. Otherwise | |
234 // we can safely ignore the object. | |
235 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
236 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
237 } else { | |
238 oop_size = oop(bottom)->size(); | |
239 } | |
240 | |
241 bottom += oop_size; | |
242 | |
243 if (bottom < top) { | |
244 // We replicate the loop below for several kinds of possible filters. | |
245 switch (_fk) { | |
246 case NoFilterKind: | |
247 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
248 break; | |
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249 |
342 | 250 case IntoCSFilterKind: { |
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251 FilterIntoCSClosure filt(this, g1h, cl); |
342 | 252 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
253 break; | |
254 } | |
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255 |
342 | 256 case OutOfRegionFilterKind: { |
257 FilterOutOfRegionClosure filt(_hr, cl); | |
258 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
259 break; | |
260 } | |
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261 |
342 | 262 default: |
263 ShouldNotReachHere(); | |
264 } | |
265 | |
266 // Last object. Need to do dead-obj filtering here too. | |
267 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
268 oop(bottom)->oop_iterate(cl2, mr); | |
269 } | |
270 } | |
271 } | |
272 | |
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273 // Minimum region size; we won't go lower than that. |
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274 // We might want to decrease this in the future, to deal with small |
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275 // heaps a bit more efficiently. |
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276 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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277 |
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278 // Maximum region size; we don't go higher than that. There's a good |
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279 // reason for having an upper bound. We don't want regions to get too |
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280 // large, otherwise cleanup's effectiveness would decrease as there |
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281 // will be fewer opportunities to find totally empty regions after |
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282 // marking. |
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283 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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284 |
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285 // The automatic region size calculation will try to have around this |
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286 // many regions in the heap (based on the min heap size). |
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287 #define TARGET_REGION_NUMBER 2048 |
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288 |
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289 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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290 // region_size in bytes |
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291 uintx region_size = G1HeapRegionSize; |
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292 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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293 // We base the automatic calculation on the min heap size. This |
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294 // can be problematic if the spread between min and max is quite |
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295 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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296 // the max size, the region size might be way too large for the |
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297 // min size. Either way, some users might have to set the region |
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298 // size manually for some -Xms / -Xmx combos. |
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299 |
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300 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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301 (uintx) MIN_REGION_SIZE); |
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302 } |
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303 |
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304 int region_size_log = log2_long((jlong) region_size); |
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305 // Recalculate the region size to make sure it's a power of |
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306 // 2. This means that region_size is the largest power of 2 that's |
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307 // <= what we've calculated so far. |
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308 region_size = ((uintx)1 << region_size_log); |
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309 |
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310 // Now make sure that we don't go over or under our limits. |
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311 if (region_size < MIN_REGION_SIZE) { |
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312 region_size = MIN_REGION_SIZE; |
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313 } else if (region_size > MAX_REGION_SIZE) { |
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314 region_size = MAX_REGION_SIZE; |
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315 } |
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316 |
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317 if (region_size != G1HeapRegionSize) { |
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318 // Update the flag to make sure that PrintFlagsFinal logs the correct value |
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319 FLAG_SET_ERGO(uintx, G1HeapRegionSize, region_size); |
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320 } |
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321 |
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322 // And recalculate the log. |
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323 region_size_log = log2_long((jlong) region_size); |
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324 |
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325 // Now, set up the globals. |
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326 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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327 LogOfHRGrainBytes = region_size_log; |
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328 |
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329 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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330 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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331 |
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332 guarantee(GrainBytes == 0, "we should only set it once"); |
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333 // The cast to int is safe, given that we've bounded region_size by |
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334 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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335 GrainBytes = (size_t)region_size; |
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336 |
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337 guarantee(GrainWords == 0, "we should only set it once"); |
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338 GrainWords = GrainBytes >> LogHeapWordSize; |
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339 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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340 |
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341 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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342 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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343 } |
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344 |
342 | 345 void HeapRegion::reset_after_compaction() { |
346 G1OffsetTableContigSpace::reset_after_compaction(); | |
347 // After a compaction the mark bitmap is invalid, so we must | |
348 // treat all objects as being inside the unmarked area. | |
349 zero_marked_bytes(); | |
350 init_top_at_mark_start(); | |
351 } | |
352 | |
353 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
2152 | 354 assert(_humongous_type == NotHumongous, |
355 "we should have already filtered out humongous regions"); | |
356 assert(_humongous_start_region == NULL, | |
357 "we should have already filtered out humongous regions"); | |
358 assert(_end == _orig_end, | |
359 "we should have already filtered out humongous regions"); | |
360 | |
342 | 361 _in_collection_set = false; |
362 | |
363 set_young_index_in_cset(-1); | |
364 uninstall_surv_rate_group(); | |
365 set_young_type(NotYoung); | |
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366 reset_pre_dummy_top(); |
342 | 367 |
368 if (!par) { | |
369 // If this is parallel, this will be done later. | |
370 HeapRegionRemSet* hrrs = rem_set(); | |
371 if (hrrs != NULL) hrrs->clear(); | |
355 | 372 _claimed = InitialClaimValue; |
342 | 373 } |
374 zero_marked_bytes(); | |
375 | |
376 _offsets.resize(HeapRegion::GrainWords); | |
377 init_top_at_mark_start(); | |
356 | 378 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 379 } |
380 | |
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381 void HeapRegion::par_clear() { |
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382 assert(used() == 0, "the region should have been already cleared"); |
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383 assert(capacity() == HeapRegion::GrainBytes, "should be back to normal"); |
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384 HeapRegionRemSet* hrrs = rem_set(); |
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385 hrrs->clear(); |
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386 CardTableModRefBS* ct_bs = |
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387 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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388 ct_bs->clear(MemRegion(bottom(), end())); |
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389 } |
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390 |
342 | 391 void HeapRegion::calc_gc_efficiency() { |
6611 | 392 // GC efficiency is the ratio of how much space would be |
393 // reclaimed over how long we predict it would take to reclaim it. | |
342 | 394 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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395 G1CollectorPolicy* g1p = g1h->g1_policy(); |
6611 | 396 |
397 // Retrieve a prediction of the elapsed time for this region for | |
398 // a mixed gc because the region will only be evacuated during a | |
399 // mixed gc. | |
400 double region_elapsed_time_ms = | |
401 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
402 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
342 | 403 } |
404 | |
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405 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
2152 | 406 assert(!isHumongous(), "sanity / pre-condition"); |
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407 assert(end() == _orig_end, |
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408 "Should be normal before the humongous object allocation"); |
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409 assert(top() == bottom(), "should be empty"); |
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410 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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411 |
355 | 412 _humongous_type = StartsHumongous; |
342 | 413 _humongous_start_region = this; |
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414 |
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415 set_end(new_end); |
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416 _offsets.set_for_starts_humongous(new_top); |
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417 } |
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418 |
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419 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
2152 | 420 assert(!isHumongous(), "sanity / pre-condition"); |
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421 assert(end() == _orig_end, |
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422 "Should be normal before the humongous object allocation"); |
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423 assert(top() == bottom(), "should be empty"); |
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424 assert(first_hr->startsHumongous(), "pre-condition"); |
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425 |
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426 _humongous_type = ContinuesHumongous; |
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427 _humongous_start_region = first_hr; |
342 | 428 } |
429 | |
2152 | 430 void HeapRegion::set_notHumongous() { |
431 assert(isHumongous(), "pre-condition"); | |
432 | |
433 if (startsHumongous()) { | |
434 assert(top() <= end(), "pre-condition"); | |
435 set_end(_orig_end); | |
436 if (top() > end()) { | |
437 // at least one "continues humongous" region after it | |
438 set_top(end()); | |
439 } | |
440 } else { | |
441 // continues humongous | |
442 assert(end() == _orig_end, "sanity"); | |
443 } | |
444 | |
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445 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
2152 | 446 _humongous_type = NotHumongous; |
447 _humongous_start_region = NULL; | |
448 } | |
449 | |
342 | 450 bool HeapRegion::claimHeapRegion(jint claimValue) { |
451 jint current = _claimed; | |
452 if (current != claimValue) { | |
453 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
454 if (res == current) { | |
455 return true; | |
456 } | |
457 } | |
458 return false; | |
459 } | |
460 | |
461 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
462 HeapWord* low = addr; | |
463 HeapWord* high = end(); | |
464 while (low < high) { | |
465 size_t diff = pointer_delta(high, low); | |
466 // Must add one below to bias toward the high amount. Otherwise, if | |
467 // "high" were at the desired value, and "low" were one less, we | |
468 // would not converge on "high". This is not symmetric, because | |
469 // we set "high" to a block start, which might be the right one, | |
470 // which we don't do for "low". | |
471 HeapWord* middle = low + (diff+1)/2; | |
472 if (middle == high) return high; | |
473 HeapWord* mid_bs = block_start_careful(middle); | |
474 if (mid_bs < addr) { | |
475 low = middle; | |
476 } else { | |
477 high = mid_bs; | |
478 } | |
479 } | |
480 assert(low == high && low >= addr, "Didn't work."); | |
481 return low; | |
482 } | |
483 | |
484 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
485 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
486 #endif // _MSC_VER | |
487 | |
488 | |
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489 HeapRegion::HeapRegion(uint hrs_index, |
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490 G1BlockOffsetSharedArray* sharedOffsetArray, |
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491 MemRegion mr) : |
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492 G1OffsetTableContigSpace(sharedOffsetArray, mr), |
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493 _hrs_index(hrs_index), |
355 | 494 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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495 _in_collection_set(false), |
342 | 496 _next_in_special_set(NULL), _orig_end(NULL), |
355 | 497 _claimed(InitialClaimValue), _evacuation_failed(false), |
6011 | 498 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
342 | 499 _young_type(NotYoung), _next_young_region(NULL), |
2152 | 500 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
501 #ifdef ASSERT | |
502 _containing_set(NULL), | |
503 #endif // ASSERT | |
504 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
505 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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506 _predicted_bytes_to_copy(0) |
342 | 507 { |
508 _orig_end = mr.end(); | |
509 // Note that initialize() will set the start of the unmarked area of the | |
510 // region. | |
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511 hr_clear(false /*par*/, false /*clear_space*/); |
356 | 512 set_top(bottom()); |
513 set_saved_mark(); | |
342 | 514 |
515 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
516 | |
517 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
518 } | |
519 | |
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520 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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521 // We're not using an iterator given that it will wrap around when |
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522 // it reaches the last region and this is not what we want here. |
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523 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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524 uint index = hrs_index() + 1; |
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525 while (index < g1h->n_regions()) { |
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526 HeapRegion* hr = g1h->region_at(index); |
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527 if (!hr->isHumongous()) { |
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528 return hr; |
342 | 529 } |
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530 index += 1; |
342 | 531 } |
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532 return NULL; |
342 | 533 } |
534 | |
535 void HeapRegion::save_marks() { | |
536 set_saved_mark(); | |
537 } | |
538 | |
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539 void HeapRegion::oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
342 | 540 HeapWord* p = mr.start(); |
541 HeapWord* e = mr.end(); | |
542 oop obj; | |
543 while (p < e) { | |
544 obj = oop(p); | |
545 p += obj->oop_iterate(cl); | |
546 } | |
547 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
548 } | |
549 | |
550 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
551 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
552 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
553 } | |
554 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
555 | |
556 | |
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557 void HeapRegion::oop_before_save_marks_iterate(ExtendedOopClosure* cl) { |
342 | 558 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); |
559 } | |
560 | |
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561 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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562 bool during_conc_mark) { |
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563 // We always recreate the prev marking info and we'll explicitly |
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564 // mark all objects we find to be self-forwarded on the prev |
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565 // bitmap. So all objects need to be below PTAMS. |
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566 _prev_top_at_mark_start = top(); |
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567 _prev_marked_bytes = 0; |
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568 |
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569 if (during_initial_mark) { |
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570 // During initial-mark, we'll also explicitly mark all objects |
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571 // we find to be self-forwarded on the next bitmap. So all |
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572 // objects need to be below NTAMS. |
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573 _next_top_at_mark_start = top(); |
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574 _next_marked_bytes = 0; |
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575 } else if (during_conc_mark) { |
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576 // During concurrent mark, all objects in the CSet (including |
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577 // the ones we find to be self-forwarded) are implicitly live. |
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578 // So all objects need to be above NTAMS. |
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579 _next_top_at_mark_start = bottom(); |
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580 _next_marked_bytes = 0; |
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581 } |
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582 } |
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583 |
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584 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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585 bool during_conc_mark, |
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586 size_t marked_bytes) { |
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587 assert(0 <= marked_bytes && marked_bytes <= used(), |
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588 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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589 marked_bytes, used())); |
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590 _prev_marked_bytes = marked_bytes; |
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591 } |
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592 |
342 | 593 HeapWord* |
594 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
595 ObjectClosure* cl) { | |
596 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
597 // We used to use "block_start_careful" here. But we're actually happy | |
598 // to update the BOT while we do this... | |
599 HeapWord* cur = block_start(mr.start()); | |
600 mr = mr.intersection(used_region()); | |
601 if (mr.is_empty()) return NULL; | |
602 // Otherwise, find the obj that extends onto mr.start(). | |
603 | |
604 assert(cur <= mr.start() | |
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605 && (oop(cur)->klass_or_null() == NULL || |
342 | 606 cur + oop(cur)->size() > mr.start()), |
607 "postcondition of block_start"); | |
608 oop obj; | |
609 while (cur < mr.end()) { | |
610 obj = oop(cur); | |
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611 if (obj->klass_or_null() == NULL) { |
342 | 612 // Ran into an unparseable point. |
613 return cur; | |
614 } else if (!g1h->is_obj_dead(obj)) { | |
615 cl->do_object(obj); | |
616 } | |
617 if (cl->abort()) return cur; | |
618 // The check above must occur before the operation below, since an | |
619 // abort might invalidate the "size" operation. | |
620 cur += obj->size(); | |
621 } | |
622 return NULL; | |
623 } | |
624 | |
625 HeapWord* | |
626 HeapRegion:: | |
627 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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628 FilterOutOfRegionClosure* cl, |
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629 bool filter_young, |
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630 jbyte* card_ptr) { |
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631 // Currently, we should only have to clean the card if filter_young |
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632 // is true and vice versa. |
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633 if (filter_young) { |
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634 assert(card_ptr != NULL, "pre-condition"); |
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635 } else { |
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636 assert(card_ptr == NULL, "pre-condition"); |
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637 } |
342 | 638 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
639 | |
640 // If we're within a stop-world GC, then we might look at a card in a | |
641 // GC alloc region that extends onto a GC LAB, which may not be | |
642 // parseable. Stop such at the "saved_mark" of the region. | |
4839 | 643 if (g1h->is_gc_active()) { |
342 | 644 mr = mr.intersection(used_region_at_save_marks()); |
645 } else { | |
646 mr = mr.intersection(used_region()); | |
647 } | |
648 if (mr.is_empty()) return NULL; | |
649 // Otherwise, find the obj that extends onto mr.start(). | |
650 | |
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651 // The intersection of the incoming mr (for the card) and the |
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652 // allocated part of the region is non-empty. This implies that |
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653 // we have actually allocated into this region. The code in |
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654 // G1CollectedHeap.cpp that allocates a new region sets the |
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655 // is_young tag on the region before allocating. Thus we |
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656 // safely know if this region is young. |
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657 if (is_young() && filter_young) { |
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658 return NULL; |
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659 } |
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660 |
1705 | 661 assert(!is_young(), "check value of filter_young"); |
662 | |
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663 // We can only clean the card here, after we make the decision that |
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664 // the card is not young. And we only clean the card if we have been |
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665 // asked to (i.e., card_ptr != NULL). |
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666 if (card_ptr != NULL) { |
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667 *card_ptr = CardTableModRefBS::clean_card_val(); |
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668 // We must complete this write before we do any of the reads below. |
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669 OrderAccess::storeload(); |
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670 } |
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671 |
4839 | 672 // Cache the boundaries of the memory region in some const locals |
673 HeapWord* const start = mr.start(); | |
674 HeapWord* const end = mr.end(); | |
675 | |
342 | 676 // We used to use "block_start_careful" here. But we're actually happy |
677 // to update the BOT while we do this... | |
4839 | 678 HeapWord* cur = block_start(start); |
679 assert(cur <= start, "Postcondition"); | |
680 | |
681 oop obj; | |
342 | 682 |
4839 | 683 HeapWord* next = cur; |
684 while (next <= start) { | |
685 cur = next; | |
686 obj = oop(cur); | |
687 if (obj->klass_or_null() == NULL) { | |
342 | 688 // Ran into an unparseable point. |
689 return cur; | |
690 } | |
691 // Otherwise... | |
4839 | 692 next = (cur + obj->size()); |
342 | 693 } |
4839 | 694 |
695 // If we finish the above loop...We have a parseable object that | |
696 // begins on or before the start of the memory region, and ends | |
697 // inside or spans the entire region. | |
698 | |
699 assert(obj == oop(cur), "sanity"); | |
700 assert(cur <= start && | |
701 obj->klass_or_null() != NULL && | |
702 (cur + obj->size()) > start, | |
342 | 703 "Loop postcondition"); |
4839 | 704 |
342 | 705 if (!g1h->is_obj_dead(obj)) { |
706 obj->oop_iterate(cl, mr); | |
707 } | |
708 | |
4839 | 709 while (cur < end) { |
342 | 710 obj = oop(cur); |
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711 if (obj->klass_or_null() == NULL) { |
342 | 712 // Ran into an unparseable point. |
713 return cur; | |
714 }; | |
4839 | 715 |
342 | 716 // Otherwise: |
717 next = (cur + obj->size()); | |
4839 | 718 |
342 | 719 if (!g1h->is_obj_dead(obj)) { |
4839 | 720 if (next < end || !obj->is_objArray()) { |
721 // This object either does not span the MemRegion | |
722 // boundary, or if it does it's not an array. | |
723 // Apply closure to whole object. | |
342 | 724 obj->oop_iterate(cl); |
725 } else { | |
4839 | 726 // This obj is an array that spans the boundary. |
727 // Stop at the boundary. | |
728 obj->oop_iterate(cl, mr); | |
342 | 729 } |
730 } | |
731 cur = next; | |
732 } | |
733 return NULL; | |
734 } | |
735 | |
736 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
737 void HeapRegion::print_on(outputStream* st) const { | |
738 if (isHumongous()) { | |
739 if (startsHumongous()) | |
740 st->print(" HS"); | |
741 else | |
742 st->print(" HC"); | |
743 } else { | |
744 st->print(" "); | |
745 } | |
746 if (in_collection_set()) | |
747 st->print(" CS"); | |
748 else | |
749 st->print(" "); | |
750 if (is_young()) | |
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751 st->print(is_survivor() ? " SU" : " Y "); |
342 | 752 else |
753 st->print(" "); | |
754 if (is_empty()) | |
755 st->print(" F"); | |
756 else | |
757 st->print(" "); | |
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758 st->print(" TS %5d", _gc_time_stamp); |
1388 | 759 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
760 prev_top_at_mark_start(), next_top_at_mark_start()); | |
342 | 761 G1OffsetTableContigSpace::print_on(st); |
762 } | |
763 | |
6008 | 764 void HeapRegion::verify() const { |
1020
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765 bool dummy = false; |
6008 | 766 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); |
811 | 767 } |
768 | |
342 | 769 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
770 // We would need a mechanism to make that code skip dead objects. | |
771 | |
6008 | 772 void HeapRegion::verify(VerifyOption vo, |
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773 bool* failures) const { |
342 | 774 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
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775 *failures = false; |
342 | 776 HeapWord* p = bottom(); |
777 HeapWord* prev_p = NULL; | |
3772
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778 VerifyLiveClosure vl_cl(g1, vo); |
1718
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779 bool is_humongous = isHumongous(); |
2133
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780 bool do_bot_verify = !is_young(); |
1718
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781 size_t object_num = 0; |
342 | 782 while (p < top()) { |
2133
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783 oop obj = oop(p); |
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784 size_t obj_size = obj->size(); |
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785 object_num += 1; |
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|
786 |
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787 if (is_humongous != g1->isHumongous(obj_size)) { |
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788 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
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789 SIZE_FORMAT" words) in a %shumongous region", |
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790 p, g1->isHumongous(obj_size) ? "" : "non-", |
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791 obj_size, is_humongous ? "" : "non-"); |
1718
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792 *failures = true; |
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|
793 return; |
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|
794 } |
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795 |
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796 // If it returns false, verify_for_object() will output the |
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797 // appropriate messasge. |
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798 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
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799 *failures = true; |
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|
800 return; |
1718
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|
801 } |
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|
802 |
3772
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803 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
2133
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804 if (obj->is_oop()) { |
6725
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805 Klass* klass = obj->klass(); |
11034 | 806 if (!klass->is_metaspace_object()) { |
2133
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diff
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|
807 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
6725
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808 "not metadata", klass, obj); |
2133
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|
809 *failures = true; |
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|
810 return; |
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|
811 } else if (!klass->is_klass()) { |
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|
812 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
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diff
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|
813 "not a klass", klass, obj); |
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|
814 *failures = true; |
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diff
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|
815 return; |
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diff
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|
816 } else { |
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|
817 vl_cl.set_containing_obj(obj); |
6725
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818 obj->oop_iterate_no_header(&vl_cl); |
2133
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|
819 if (vl_cl.failures()) { |
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diff
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820 *failures = true; |
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|
821 } |
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822 if (G1MaxVerifyFailures >= 0 && |
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823 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
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|
824 return; |
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|
825 } |
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diff
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|
826 } |
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|
827 } else { |
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diff
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|
828 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
1020
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829 *failures = true; |
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|
830 return; |
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|
831 } |
342 | 832 } |
833 prev_p = p; | |
2133
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|
834 p += obj_size; |
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|
835 } |
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|
836 |
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|
837 if (p != top()) { |
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838 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
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diff
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839 "does not match top "PTR_FORMAT, p, top()); |
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|
840 *failures = true; |
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diff
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|
841 return; |
342 | 842 } |
2133
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diff
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|
843 |
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|
844 HeapWord* the_end = end(); |
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diff
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|
845 assert(p == top(), "it should still hold"); |
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diff
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|
846 // Do some extra BOT consistency checking for addresses in the |
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diff
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|
847 // range [top, end). BOT look-ups in this range should yield |
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diff
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|
848 // top. No point in doing that if top == end (there's nothing there). |
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1972
diff
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|
849 if (p < the_end) { |
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parents:
1972
diff
changeset
|
850 // Look up top |
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1972
diff
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|
851 HeapWord* addr_1 = p; |
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1972
diff
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|
852 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
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1972
diff
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|
853 if (b_start_1 != p) { |
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diff
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|
854 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
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1972
diff
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|
855 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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diff
changeset
|
856 addr_1, b_start_1, p); |
2250ee17e258
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1972
diff
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|
857 *failures = true; |
2250ee17e258
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1972
diff
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|
858 return; |
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1972
diff
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|
859 } |
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diff
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|
860 |
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parents:
1972
diff
changeset
|
861 // Look up top + 1 |
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diff
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|
862 HeapWord* addr_2 = p + 1; |
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diff
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|
863 if (addr_2 < the_end) { |
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diff
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|
864 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
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diff
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|
865 if (b_start_2 != p) { |
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diff
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|
866 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
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diff
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|
867 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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|
868 addr_2, b_start_2, p); |
1020
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942
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|
869 *failures = true; |
ff2402f6a50b
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|
870 return; |
2133
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diff
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|
871 } |
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diff
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|
872 } |
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diff
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|
873 |
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diff
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|
874 // Look up an address between top and end |
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diff
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|
875 size_t diff = pointer_delta(the_end, p) / 2; |
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diff
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|
876 HeapWord* addr_3 = p + diff; |
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1972
diff
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|
877 if (addr_3 < the_end) { |
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|
878 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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1972
diff
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|
879 if (b_start_3 != p) { |
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diff
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|
880 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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diff
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|
881 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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diff
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|
882 addr_3, b_start_3, p); |
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diff
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|
883 *failures = true; |
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1972
diff
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|
884 return; |
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tonyp
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1972
diff
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|
885 } |
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diff
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|
886 } |
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diff
changeset
|
887 |
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parents:
1972
diff
changeset
|
888 // Loook up end - 1 |
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1972
diff
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|
889 HeapWord* addr_4 = the_end - 1; |
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diff
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|
890 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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1972
diff
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|
891 if (b_start_4 != p) { |
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1972
diff
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|
892 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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diff
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|
893 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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parents:
1972
diff
changeset
|
894 addr_4, b_start_4, p); |
2250ee17e258
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diff
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|
895 *failures = true; |
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1972
diff
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|
896 return; |
1020
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942
diff
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|
897 } |
342 | 898 } |
1020
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942
diff
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|
899 |
1718
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parents:
1705
diff
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|
900 if (is_humongous && object_num > 1) { |
bb847e31b836
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tonyp
parents:
1705
diff
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|
901 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
bb847e31b836
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tonyp
parents:
1705
diff
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|
902 "but has "SIZE_FORMAT", objects", |
bb847e31b836
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tonyp
parents:
1705
diff
changeset
|
903 bottom(), end(), object_num); |
bb847e31b836
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parents:
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diff
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|
904 *failures = true; |
1020
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|
905 return; |
342 | 906 } |
907 } | |
908 | |
909 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
910 // away eventually. | |
911 | |
356 | 912 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
913 ContiguousSpace::clear(mangle_space); | |
342 | 914 _offsets.zero_bottom_entry(); |
915 _offsets.initialize_threshold(); | |
916 } | |
917 | |
918 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
919 Space::set_bottom(new_bottom); | |
920 _offsets.set_bottom(new_bottom); | |
921 } | |
922 | |
923 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
924 Space::set_end(new_end); | |
925 _offsets.resize(new_end - bottom()); | |
926 } | |
927 | |
928 void G1OffsetTableContigSpace::print() const { | |
929 print_short(); | |
930 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
931 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
932 bottom(), top(), _offsets.threshold(), end()); | |
933 } | |
934 | |
935 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
936 return _offsets.initialize_threshold(); | |
937 } | |
938 | |
939 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
940 HeapWord* end) { | |
941 _offsets.alloc_block(start, end); | |
942 return _offsets.threshold(); | |
943 } | |
944 | |
945 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
946 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
947 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
948 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
949 return top(); | |
950 else | |
951 return ContiguousSpace::saved_mark_word(); | |
952 } | |
953 | |
954 void G1OffsetTableContigSpace::set_saved_mark() { | |
955 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
956 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
957 | |
958 if (_gc_time_stamp < curr_gc_time_stamp) { | |
959 // The order of these is important, as another thread might be | |
960 // about to start scanning this region. If it does so after | |
961 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
962 // will be false, and it will pick up top() as the high water mark | |
963 // of region. If it does so after _gc_time_stamp = ..., then it | |
964 // will pick up the right saved_mark_word() as the high water mark | |
965 // of the region. Either way, the behaviour will be correct. | |
966 ContiguousSpace::set_saved_mark(); | |
845
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967 OrderAccess::storestore(); |
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968 _gc_time_stamp = curr_gc_time_stamp; |
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969 // No need to do another barrier to flush the writes above. If |
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970 // this is called in parallel with other threads trying to |
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971 // allocate into the region, the caller should call this while |
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972 // holding a lock and when the lock is released the writes will be |
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973 // flushed. |
342 | 974 } |
975 } | |
976 | |
977 G1OffsetTableContigSpace:: | |
978 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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979 MemRegion mr) : |
342 | 980 _offsets(sharedOffsetArray, mr), |
981 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
982 _gc_time_stamp(0) | |
983 { | |
984 _offsets.set_space(this); | |
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985 // false ==> we'll do the clearing if there's clearing to be done. |
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986 ContiguousSpace::initialize(mr, false, SpaceDecorator::Mangle); |
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987 _offsets.zero_bottom_entry(); |
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988 _offsets.initialize_threshold(); |
342 | 989 } |