Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 3830:f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
Summary: Refactor the allocation code during GC to use the G1AllocRegion abstraction. Use separate subclasses of G1AllocRegion for survivor and old regions. Avoid BOT updates and dirty survivor cards incrementally for the former.
Reviewed-by: brutisso, johnc, ysr
| author | tonyp |
|---|---|
| date | Fri, 12 Aug 2011 11:31:06 -0400 |
| parents | 6747fd0512e0 |
| children | f0ecbe78fc7b |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 29 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
| 30 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 31 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 32 #include "memory/genOopClosures.inline.hpp" | |
| 33 #include "memory/iterator.hpp" | |
| 34 #include "oops/oop.inline.hpp" | |
| 342 | 35 |
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36 int HeapRegion::LogOfHRGrainBytes = 0; |
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37 int HeapRegion::LogOfHRGrainWords = 0; |
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38 int HeapRegion::GrainBytes = 0; |
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39 int HeapRegion::GrainWords = 0; |
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40 int HeapRegion::CardsPerRegion = 0; |
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41 |
| 342 | 42 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
| 43 HeapRegion* hr, OopClosure* cl, | |
| 44 CardTableModRefBS::PrecisionStyle precision, | |
| 45 FilterKind fk) : | |
| 46 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
| 47 _hr(hr), _fk(fk), _g1(g1) | |
| 48 {} | |
| 49 | |
| 50 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
| 51 OopClosure* oc) : | |
| 52 _r_bottom(r->bottom()), _r_end(r->end()), | |
| 53 _oc(oc), _out_of_region(0) | |
| 54 {} | |
| 55 | |
| 56 class VerifyLiveClosure: public OopClosure { | |
| 811 | 57 private: |
| 342 | 58 G1CollectedHeap* _g1h; |
| 59 CardTableModRefBS* _bs; | |
| 60 oop _containing_obj; | |
| 61 bool _failures; | |
| 62 int _n_failures; | |
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63 VerifyOption _vo; |
| 342 | 64 public: |
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65 // _vo == UsePrevMarking -> use "prev" marking information, |
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66 // _vo == UseNextMarking -> use "next" marking information, |
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67 // _vo == UseMarkWord -> use mark word from object header. |
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68 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : |
| 342 | 69 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
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70 _failures(false), _n_failures(0), _vo(vo) |
| 342 | 71 { |
| 72 BarrierSet* bs = _g1h->barrier_set(); | |
| 73 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 74 _bs = (CardTableModRefBS*)bs; | |
| 75 } | |
| 76 | |
| 77 void set_containing_obj(oop obj) { | |
| 78 _containing_obj = obj; | |
| 79 } | |
| 80 | |
| 81 bool failures() { return _failures; } | |
| 82 int n_failures() { return _n_failures; } | |
| 83 | |
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84 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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85 virtual void do_oop( oop* p) { do_oop_work(p); } |
| 342 | 86 |
| 1388 | 87 void print_object(outputStream* out, oop obj) { |
| 88 #ifdef PRODUCT | |
| 89 klassOop k = obj->klass(); | |
| 90 const char* class_name = instanceKlass::cast(k)->external_name(); | |
| 91 out->print_cr("class name %s", class_name); | |
| 92 #else // PRODUCT | |
| 93 obj->print_on(out); | |
| 94 #endif // PRODUCT | |
| 95 } | |
| 96 | |
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97 template <class T> void do_oop_work(T* p) { |
| 342 | 98 assert(_containing_obj != NULL, "Precondition"); |
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99 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), |
| 811 | 100 "Precondition"); |
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101 T heap_oop = oopDesc::load_heap_oop(p); |
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102 if (!oopDesc::is_null(heap_oop)) { |
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103 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 104 bool failed = false; |
| 811 | 105 if (!_g1h->is_in_closed_subset(obj) || |
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106 _g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 107 if (!_failures) { |
| 108 gclog_or_tty->print_cr(""); | |
| 109 gclog_or_tty->print_cr("----------"); | |
| 110 } | |
| 111 if (!_g1h->is_in_closed_subset(obj)) { | |
| 1388 | 112 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
| 342 | 113 gclog_or_tty->print_cr("Field "PTR_FORMAT |
| 1388 | 114 " of live obj "PTR_FORMAT" in region " |
| 115 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 116 p, (void*) _containing_obj, | |
| 117 from->bottom(), from->end()); | |
| 118 print_object(gclog_or_tty, _containing_obj); | |
| 119 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 120 (void*) obj); | |
| 121 } else { | |
| 122 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 123 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 124 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 125 " of live obj "PTR_FORMAT" in region " | |
| 126 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 127 p, (void*) _containing_obj, | |
| 128 from->bottom(), from->end()); | |
| 129 print_object(gclog_or_tty, _containing_obj); | |
| 130 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 131 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 132 (void*) obj, to->bottom(), to->end()); | |
| 133 print_object(gclog_or_tty, obj); | |
| 342 | 134 } |
| 135 gclog_or_tty->print_cr("----------"); | |
| 136 _failures = true; | |
| 137 failed = true; | |
| 138 _n_failures++; | |
| 139 } | |
| 140 | |
| 141 if (!_g1h->full_collection()) { | |
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142 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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143 HeapRegion* to = _g1h->heap_region_containing(obj); |
| 342 | 144 if (from != NULL && to != NULL && |
| 145 from != to && | |
| 146 !to->isHumongous()) { | |
| 147 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 148 jbyte cv_field = *_bs->byte_for_const(p); | |
| 149 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 150 | |
| 151 bool is_bad = !(from->is_young() | |
| 152 || to->rem_set()->contains_reference(p) | |
| 153 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 154 (_containing_obj->is_objArray() ? | |
| 155 cv_field == dirty | |
| 156 : cv_obj == dirty || cv_field == dirty)); | |
| 157 if (is_bad) { | |
| 158 if (!_failures) { | |
| 159 gclog_or_tty->print_cr(""); | |
| 160 gclog_or_tty->print_cr("----------"); | |
| 161 } | |
| 162 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 3766 | 163 gclog_or_tty->print_cr("Field "PTR_FORMAT" " |
| 164 "of obj "PTR_FORMAT", " | |
| 165 "in region "HR_FORMAT, | |
| 166 p, (void*) _containing_obj, | |
| 167 HR_FORMAT_PARAMS(from)); | |
| 342 | 168 _containing_obj->print_on(gclog_or_tty); |
| 3766 | 169 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " |
| 170 "in region "HR_FORMAT, | |
| 171 (void*) obj, | |
| 172 HR_FORMAT_PARAMS(to)); | |
| 342 | 173 obj->print_on(gclog_or_tty); |
| 174 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 175 cv_obj, cv_field); | |
| 176 gclog_or_tty->print_cr("----------"); | |
| 177 _failures = true; | |
| 178 if (!failed) _n_failures++; | |
| 179 } | |
| 180 } | |
| 181 } | |
| 182 } | |
| 183 } | |
| 184 }; | |
| 185 | |
| 186 template<class ClosureType> | |
| 187 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
| 188 HeapRegion* hr, | |
| 189 HeapWord* cur, HeapWord* top) { | |
| 190 oop cur_oop = oop(cur); | |
| 191 int oop_size = cur_oop->size(); | |
| 192 HeapWord* next_obj = cur + oop_size; | |
| 193 while (next_obj < top) { | |
| 194 // Keep filtering the remembered set. | |
| 195 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
| 196 // Bottom lies entirely below top, so we can call the | |
| 197 // non-memRegion version of oop_iterate below. | |
| 198 cur_oop->oop_iterate(cl); | |
| 199 } | |
| 200 cur = next_obj; | |
| 201 cur_oop = oop(cur); | |
| 202 oop_size = cur_oop->size(); | |
| 203 next_obj = cur + oop_size; | |
| 204 } | |
| 205 return cur; | |
| 206 } | |
| 207 | |
| 208 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
| 209 HeapWord* bottom, | |
| 210 HeapWord* top, | |
| 211 OopClosure* cl) { | |
| 212 G1CollectedHeap* g1h = _g1; | |
| 213 | |
| 214 int oop_size; | |
| 215 | |
| 216 OopClosure* cl2 = cl; | |
| 217 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
| 218 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
| 219 switch (_fk) { | |
| 220 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
| 221 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
| 222 } | |
| 223 | |
| 224 // Start filtering what we add to the remembered set. If the object is | |
| 225 // not considered dead, either because it is marked (in the mark bitmap) | |
| 226 // or it was allocated after marking finished, then we add it. Otherwise | |
| 227 // we can safely ignore the object. | |
| 228 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 229 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 230 } else { | |
| 231 oop_size = oop(bottom)->size(); | |
| 232 } | |
| 233 | |
| 234 bottom += oop_size; | |
| 235 | |
| 236 if (bottom < top) { | |
| 237 // We replicate the loop below for several kinds of possible filters. | |
| 238 switch (_fk) { | |
| 239 case NoFilterKind: | |
| 240 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
| 241 break; | |
| 242 case IntoCSFilterKind: { | |
| 243 FilterIntoCSClosure filt(this, g1h, cl); | |
| 244 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 245 break; | |
| 246 } | |
| 247 case OutOfRegionFilterKind: { | |
| 248 FilterOutOfRegionClosure filt(_hr, cl); | |
| 249 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 250 break; | |
| 251 } | |
| 252 default: | |
| 253 ShouldNotReachHere(); | |
| 254 } | |
| 255 | |
| 256 // Last object. Need to do dead-obj filtering here too. | |
| 257 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 258 oop(bottom)->oop_iterate(cl2, mr); | |
| 259 } | |
| 260 } | |
| 261 } | |
| 262 | |
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263 // Minimum region size; we won't go lower than that. |
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264 // We might want to decrease this in the future, to deal with small |
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265 // heaps a bit more efficiently. |
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266 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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267 |
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268 // Maximum region size; we don't go higher than that. There's a good |
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269 // reason for having an upper bound. We don't want regions to get too |
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270 // large, otherwise cleanup's effectiveness would decrease as there |
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271 // will be fewer opportunities to find totally empty regions after |
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272 // marking. |
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273 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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274 |
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275 // The automatic region size calculation will try to have around this |
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276 // many regions in the heap (based on the min heap size). |
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277 #define TARGET_REGION_NUMBER 2048 |
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278 |
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279 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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280 // region_size in bytes |
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281 uintx region_size = G1HeapRegionSize; |
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282 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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283 // We base the automatic calculation on the min heap size. This |
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284 // can be problematic if the spread between min and max is quite |
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285 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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286 // the max size, the region size might be way too large for the |
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287 // min size. Either way, some users might have to set the region |
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288 // size manually for some -Xms / -Xmx combos. |
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289 |
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290 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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291 (uintx) MIN_REGION_SIZE); |
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292 } |
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293 |
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294 int region_size_log = log2_long((jlong) region_size); |
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295 // Recalculate the region size to make sure it's a power of |
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296 // 2. This means that region_size is the largest power of 2 that's |
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297 // <= what we've calculated so far. |
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298 region_size = ((uintx)1 << region_size_log); |
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299 |
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300 // Now make sure that we don't go over or under our limits. |
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301 if (region_size < MIN_REGION_SIZE) { |
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302 region_size = MIN_REGION_SIZE; |
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303 } else if (region_size > MAX_REGION_SIZE) { |
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304 region_size = MAX_REGION_SIZE; |
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305 } |
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306 |
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307 // And recalculate the log. |
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308 region_size_log = log2_long((jlong) region_size); |
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309 |
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310 // Now, set up the globals. |
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311 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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312 LogOfHRGrainBytes = region_size_log; |
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313 |
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314 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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315 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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316 |
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317 guarantee(GrainBytes == 0, "we should only set it once"); |
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318 // The cast to int is safe, given that we've bounded region_size by |
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319 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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320 GrainBytes = (int) region_size; |
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321 |
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322 guarantee(GrainWords == 0, "we should only set it once"); |
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323 GrainWords = GrainBytes >> LogHeapWordSize; |
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324 guarantee(1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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325 |
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326 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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327 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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328 } |
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329 |
| 342 | 330 void HeapRegion::reset_after_compaction() { |
| 331 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 332 // After a compaction the mark bitmap is invalid, so we must | |
| 333 // treat all objects as being inside the unmarked area. | |
| 334 zero_marked_bytes(); | |
| 335 init_top_at_mark_start(); | |
| 336 } | |
| 337 | |
| 338 DirtyCardToOopClosure* | |
| 339 HeapRegion::new_dcto_closure(OopClosure* cl, | |
| 340 CardTableModRefBS::PrecisionStyle precision, | |
| 341 HeapRegionDCTOC::FilterKind fk) { | |
| 342 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
| 343 this, cl, precision, fk); | |
| 344 } | |
| 345 | |
| 346 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
| 2152 | 347 assert(_humongous_type == NotHumongous, |
| 348 "we should have already filtered out humongous regions"); | |
| 349 assert(_humongous_start_region == NULL, | |
| 350 "we should have already filtered out humongous regions"); | |
| 351 assert(_end == _orig_end, | |
| 352 "we should have already filtered out humongous regions"); | |
| 353 | |
| 342 | 354 _in_collection_set = false; |
| 355 | |
| 356 set_young_index_in_cset(-1); | |
| 357 uninstall_surv_rate_group(); | |
| 358 set_young_type(NotYoung); | |
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359 reset_pre_dummy_top(); |
| 342 | 360 |
| 361 if (!par) { | |
| 362 // If this is parallel, this will be done later. | |
| 363 HeapRegionRemSet* hrrs = rem_set(); | |
| 364 if (hrrs != NULL) hrrs->clear(); | |
| 355 | 365 _claimed = InitialClaimValue; |
| 342 | 366 } |
| 367 zero_marked_bytes(); | |
| 368 set_sort_index(-1); | |
| 369 | |
| 370 _offsets.resize(HeapRegion::GrainWords); | |
| 371 init_top_at_mark_start(); | |
| 356 | 372 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 373 } |
| 374 | |
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375 void HeapRegion::par_clear() { |
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376 assert(used() == 0, "the region should have been already cleared"); |
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377 assert(capacity() == (size_t) HeapRegion::GrainBytes, |
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378 "should be back to normal"); |
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379 HeapRegionRemSet* hrrs = rem_set(); |
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380 hrrs->clear(); |
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381 CardTableModRefBS* ct_bs = |
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382 (CardTableModRefBS*)G1CollectedHeap::heap()->barrier_set(); |
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383 ct_bs->clear(MemRegion(bottom(), end())); |
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384 } |
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385 |
| 342 | 386 // <PREDICTION> |
| 387 void HeapRegion::calc_gc_efficiency() { | |
| 388 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 389 _gc_efficiency = (double) garbage_bytes() / | |
| 390 g1h->predict_region_elapsed_time_ms(this, false); | |
| 391 } | |
| 392 // </PREDICTION> | |
| 393 | |
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394 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
| 2152 | 395 assert(!isHumongous(), "sanity / pre-condition"); |
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396 assert(end() == _orig_end, |
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397 "Should be normal before the humongous object allocation"); |
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398 assert(top() == bottom(), "should be empty"); |
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399 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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400 |
| 355 | 401 _humongous_type = StartsHumongous; |
| 342 | 402 _humongous_start_region = this; |
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403 |
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404 set_end(new_end); |
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405 _offsets.set_for_starts_humongous(new_top); |
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406 } |
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407 |
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408 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
| 2152 | 409 assert(!isHumongous(), "sanity / pre-condition"); |
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410 assert(end() == _orig_end, |
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411 "Should be normal before the humongous object allocation"); |
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412 assert(top() == bottom(), "should be empty"); |
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413 assert(first_hr->startsHumongous(), "pre-condition"); |
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414 |
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415 _humongous_type = ContinuesHumongous; |
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416 _humongous_start_region = first_hr; |
| 342 | 417 } |
| 418 | |
| 2152 | 419 void HeapRegion::set_notHumongous() { |
| 420 assert(isHumongous(), "pre-condition"); | |
| 421 | |
| 422 if (startsHumongous()) { | |
| 423 assert(top() <= end(), "pre-condition"); | |
| 424 set_end(_orig_end); | |
| 425 if (top() > end()) { | |
| 426 // at least one "continues humongous" region after it | |
| 427 set_top(end()); | |
| 428 } | |
| 429 } else { | |
| 430 // continues humongous | |
| 431 assert(end() == _orig_end, "sanity"); | |
| 432 } | |
| 433 | |
| 434 assert(capacity() == (size_t) HeapRegion::GrainBytes, "pre-condition"); | |
| 435 _humongous_type = NotHumongous; | |
| 436 _humongous_start_region = NULL; | |
| 437 } | |
| 438 | |
| 342 | 439 bool HeapRegion::claimHeapRegion(jint claimValue) { |
| 440 jint current = _claimed; | |
| 441 if (current != claimValue) { | |
| 442 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 443 if (res == current) { | |
| 444 return true; | |
| 445 } | |
| 446 } | |
| 447 return false; | |
| 448 } | |
| 449 | |
| 450 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
| 451 HeapWord* low = addr; | |
| 452 HeapWord* high = end(); | |
| 453 while (low < high) { | |
| 454 size_t diff = pointer_delta(high, low); | |
| 455 // Must add one below to bias toward the high amount. Otherwise, if | |
| 456 // "high" were at the desired value, and "low" were one less, we | |
| 457 // would not converge on "high". This is not symmetric, because | |
| 458 // we set "high" to a block start, which might be the right one, | |
| 459 // which we don't do for "low". | |
| 460 HeapWord* middle = low + (diff+1)/2; | |
| 461 if (middle == high) return high; | |
| 462 HeapWord* mid_bs = block_start_careful(middle); | |
| 463 if (mid_bs < addr) { | |
| 464 low = middle; | |
| 465 } else { | |
| 466 high = mid_bs; | |
| 467 } | |
| 468 } | |
| 469 assert(low == high && low >= addr, "Didn't work."); | |
| 470 return low; | |
| 471 } | |
| 472 | |
| 356 | 473 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 474 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
| 342 | 475 hr_clear(false/*par*/, clear_space); |
| 476 } | |
| 477 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 478 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 479 #endif // _MSC_VER | |
| 480 | |
| 481 | |
| 482 HeapRegion:: | |
| 3766 | 483 HeapRegion(size_t hrs_index, G1BlockOffsetSharedArray* sharedOffsetArray, |
| 484 MemRegion mr, bool is_zeroed) | |
| 342 | 485 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), |
| 3766 | 486 _next_fk(HeapRegionDCTOC::NoFilterKind), _hrs_index(hrs_index), |
| 355 | 487 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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488 _in_collection_set(false), |
| 342 | 489 _next_in_special_set(NULL), _orig_end(NULL), |
| 355 | 490 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 342 | 491 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
| 492 _young_type(NotYoung), _next_young_region(NULL), | |
| 2152 | 493 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
| 494 #ifdef ASSERT | |
| 495 _containing_set(NULL), | |
| 496 #endif // ASSERT | |
| 497 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
| 498 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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499 _predicted_bytes_to_copy(0) |
| 342 | 500 { |
| 501 _orig_end = mr.end(); | |
| 502 // Note that initialize() will set the start of the unmarked area of the | |
| 503 // region. | |
| 356 | 504 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 505 set_top(bottom()); | |
| 506 set_saved_mark(); | |
| 342 | 507 |
| 508 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
| 509 | |
| 510 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
| 511 // In case the region is allocated during a pause, note the top. | |
| 512 // We haven't done any counting on a brand new region. | |
| 513 _top_at_conc_mark_count = bottom(); | |
| 514 } | |
| 515 | |
| 516 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
| 517 const HeapRegion* _target; | |
| 518 bool _target_seen; | |
| 519 HeapRegion* _last; | |
| 520 CompactibleSpace* _res; | |
| 521 public: | |
| 522 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
| 523 _target(target), _target_seen(false), _res(NULL) {} | |
| 524 bool doHeapRegion(HeapRegion* cur) { | |
| 525 if (_target_seen) { | |
| 526 if (!cur->isHumongous()) { | |
| 527 _res = cur; | |
| 528 return true; | |
| 529 } | |
| 530 } else if (cur == _target) { | |
| 531 _target_seen = true; | |
| 532 } | |
| 533 return false; | |
| 534 } | |
| 535 CompactibleSpace* result() { return _res; } | |
| 536 }; | |
| 537 | |
| 538 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
| 539 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 540 // cast away const-ness | |
| 541 HeapRegion* r = (HeapRegion*) this; | |
| 542 NextCompactionHeapRegionClosure blk(r); | |
| 543 g1h->heap_region_iterate_from(r, &blk); | |
| 544 return blk.result(); | |
| 545 } | |
| 546 | |
| 547 void HeapRegion::save_marks() { | |
| 548 set_saved_mark(); | |
| 549 } | |
| 550 | |
| 551 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
| 552 HeapWord* p = mr.start(); | |
| 553 HeapWord* e = mr.end(); | |
| 554 oop obj; | |
| 555 while (p < e) { | |
| 556 obj = oop(p); | |
| 557 p += obj->oop_iterate(cl); | |
| 558 } | |
| 559 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
| 560 } | |
| 561 | |
| 562 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 563 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
| 564 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 565 } | |
| 566 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 567 | |
| 568 | |
| 569 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
| 570 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
| 571 } | |
| 572 | |
| 573 HeapWord* | |
| 574 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 575 ObjectClosure* cl) { | |
| 576 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 577 // We used to use "block_start_careful" here. But we're actually happy | |
| 578 // to update the BOT while we do this... | |
| 579 HeapWord* cur = block_start(mr.start()); | |
| 580 mr = mr.intersection(used_region()); | |
| 581 if (mr.is_empty()) return NULL; | |
| 582 // Otherwise, find the obj that extends onto mr.start(). | |
| 583 | |
| 584 assert(cur <= mr.start() | |
|
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diff
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|
585 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 586 cur + oop(cur)->size() > mr.start()), |
| 587 "postcondition of block_start"); | |
| 588 oop obj; | |
| 589 while (cur < mr.end()) { | |
| 590 obj = oop(cur); | |
|
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|
591 if (obj->klass_or_null() == NULL) { |
| 342 | 592 // Ran into an unparseable point. |
| 593 return cur; | |
| 594 } else if (!g1h->is_obj_dead(obj)) { | |
| 595 cl->do_object(obj); | |
| 596 } | |
| 597 if (cl->abort()) return cur; | |
| 598 // The check above must occur before the operation below, since an | |
| 599 // abort might invalidate the "size" operation. | |
| 600 cur += obj->size(); | |
| 601 } | |
| 602 return NULL; | |
| 603 } | |
| 604 | |
| 605 HeapWord* | |
| 606 HeapRegion:: | |
| 607 oops_on_card_seq_iterate_careful(MemRegion mr, | |
|
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|
608 FilterOutOfRegionClosure* cl, |
|
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609 bool filter_young, |
|
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|
610 jbyte* card_ptr) { |
|
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|
611 // Currently, we should only have to clean the card if filter_young |
|
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|
612 // is true and vice versa. |
|
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|
613 if (filter_young) { |
|
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|
614 assert(card_ptr != NULL, "pre-condition"); |
|
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|
615 } else { |
|
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616 assert(card_ptr == NULL, "pre-condition"); |
|
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|
617 } |
| 342 | 618 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 619 | |
| 620 // If we're within a stop-world GC, then we might look at a card in a | |
| 621 // GC alloc region that extends onto a GC LAB, which may not be | |
| 622 // parseable. Stop such at the "saved_mark" of the region. | |
| 623 if (G1CollectedHeap::heap()->is_gc_active()) { | |
| 624 mr = mr.intersection(used_region_at_save_marks()); | |
| 625 } else { | |
| 626 mr = mr.intersection(used_region()); | |
| 627 } | |
| 628 if (mr.is_empty()) return NULL; | |
| 629 // Otherwise, find the obj that extends onto mr.start(). | |
| 630 | |
|
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|
631 // The intersection of the incoming mr (for the card) and the |
|
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|
632 // allocated part of the region is non-empty. This implies that |
|
5cbac8938c4c
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|
633 // we have actually allocated into this region. The code in |
|
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6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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|
634 // G1CollectedHeap.cpp that allocates a new region sets the |
|
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|
635 // is_young tag on the region before allocating. Thus we |
|
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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|
636 // safely know if this region is young. |
|
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changeset
|
637 if (is_young() && filter_young) { |
|
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|
638 return NULL; |
|
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6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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diff
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|
639 } |
|
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6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
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changeset
|
640 |
| 1705 | 641 assert(!is_young(), "check value of filter_young"); |
| 642 | |
|
3317
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|
643 // We can only clean the card here, after we make the decision that |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
644 // the card is not young. And we only clean the card if we have been |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
645 // asked to (i.e., card_ptr != NULL). |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
646 if (card_ptr != NULL) { |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
647 *card_ptr = CardTableModRefBS::clean_card_val(); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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changeset
|
648 // We must complete this write before we do any of the reads below. |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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changeset
|
649 OrderAccess::storeload(); |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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|
650 } |
|
063382f9b575
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parents:
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changeset
|
651 |
| 342 | 652 // We used to use "block_start_careful" here. But we're actually happy |
| 653 // to update the BOT while we do this... | |
| 654 HeapWord* cur = block_start(mr.start()); | |
| 655 assert(cur <= mr.start(), "Postcondition"); | |
| 656 | |
| 657 while (cur <= mr.start()) { | |
|
845
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ysr
parents:
838
diff
changeset
|
658 if (oop(cur)->klass_or_null() == NULL) { |
| 342 | 659 // Ran into an unparseable point. |
| 660 return cur; | |
| 661 } | |
| 662 // Otherwise... | |
| 663 int sz = oop(cur)->size(); | |
| 664 if (cur + sz > mr.start()) break; | |
| 665 // Otherwise, go on. | |
| 666 cur = cur + sz; | |
| 667 } | |
| 668 oop obj; | |
| 669 obj = oop(cur); | |
| 670 // If we finish this loop... | |
| 671 assert(cur <= mr.start() | |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
changeset
|
672 && obj->klass_or_null() != NULL |
| 342 | 673 && cur + obj->size() > mr.start(), |
| 674 "Loop postcondition"); | |
| 675 if (!g1h->is_obj_dead(obj)) { | |
| 676 obj->oop_iterate(cl, mr); | |
| 677 } | |
| 678 | |
| 679 HeapWord* next; | |
| 680 while (cur < mr.end()) { | |
| 681 obj = oop(cur); | |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
682 if (obj->klass_or_null() == NULL) { |
| 342 | 683 // Ran into an unparseable point. |
| 684 return cur; | |
| 685 }; | |
| 686 // Otherwise: | |
| 687 next = (cur + obj->size()); | |
| 688 if (!g1h->is_obj_dead(obj)) { | |
| 689 if (next < mr.end()) { | |
| 690 obj->oop_iterate(cl); | |
| 691 } else { | |
| 692 // this obj spans the boundary. If it's an array, stop at the | |
| 693 // boundary. | |
| 694 if (obj->is_objArray()) { | |
| 695 obj->oop_iterate(cl, mr); | |
| 696 } else { | |
| 697 obj->oop_iterate(cl); | |
| 698 } | |
| 699 } | |
| 700 } | |
| 701 cur = next; | |
| 702 } | |
| 703 return NULL; | |
| 704 } | |
| 705 | |
| 706 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
| 707 void HeapRegion::print_on(outputStream* st) const { | |
| 708 if (isHumongous()) { | |
| 709 if (startsHumongous()) | |
| 710 st->print(" HS"); | |
| 711 else | |
| 712 st->print(" HC"); | |
| 713 } else { | |
| 714 st->print(" "); | |
| 715 } | |
| 716 if (in_collection_set()) | |
| 717 st->print(" CS"); | |
| 718 else | |
| 719 st->print(" "); | |
| 720 if (is_young()) | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1388
diff
changeset
|
721 st->print(is_survivor() ? " SU" : " Y "); |
| 342 | 722 else |
| 723 st->print(" "); | |
| 724 if (is_empty()) | |
| 725 st->print(" F"); | |
| 726 else | |
| 727 st->print(" "); | |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
728 st->print(" %5d", _gc_time_stamp); |
| 1388 | 729 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 730 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 731 G1OffsetTableContigSpace::print_on(st); |
| 732 } | |
| 733 | |
| 811 | 734 void HeapRegion::verify(bool allow_dirty) const { |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
735 bool dummy = false; |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
736 verify(allow_dirty, VerifyOption_G1UsePrevMarking, /* failures */ &dummy); |
| 811 | 737 } |
| 738 | |
| 342 | 739 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
| 740 // We would need a mechanism to make that code skip dead objects. | |
| 741 | |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
742 void HeapRegion::verify(bool allow_dirty, |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
743 VerifyOption vo, |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
744 bool* failures) const { |
| 342 | 745 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
746 *failures = false; |
| 342 | 747 HeapWord* p = bottom(); |
| 748 HeapWord* prev_p = NULL; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
749 VerifyLiveClosure vl_cl(g1, vo); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
750 bool is_humongous = isHumongous(); |
|
2133
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7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
751 bool do_bot_verify = !is_young(); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
752 size_t object_num = 0; |
| 342 | 753 while (p < top()) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
754 oop obj = oop(p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
755 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
756 object_num += 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
757 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
758 if (is_humongous != g1->isHumongous(obj_size)) { |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
759 gclog_or_tty->print_cr("obj "PTR_FORMAT" is of %shumongous size (" |
|
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
760 SIZE_FORMAT" words) in a %shumongous region", |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
761 p, g1->isHumongous(obj_size) ? "" : "non-", |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
762 obj_size, is_humongous ? "" : "non-"); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
763 *failures = true; |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
764 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
765 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
766 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
767 // If it returns false, verify_for_object() will output the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
768 // appropriate messasge. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
769 if (do_bot_verify && !_offsets.verify_for_object(p, obj_size)) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
770 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
771 return; |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
772 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
773 |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
774 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
775 if (obj->is_oop()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
776 klassOop klass = obj->klass(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
777 if (!klass->is_perm()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
778 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
779 "not in perm", klass, obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
780 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
781 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
782 } else if (!klass->is_klass()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
783 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
784 "not a klass", klass, obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
785 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
786 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
787 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
788 vl_cl.set_containing_obj(obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
789 obj->oop_iterate(&vl_cl); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
790 if (vl_cl.failures()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
791 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
792 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
793 if (G1MaxVerifyFailures >= 0 && |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
794 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
795 return; |
|
2250ee17e258
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796 } |
|
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|
797 } |
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|
798 } else { |
|
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|
799 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
|
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|
800 *failures = true; |
|
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|
801 return; |
|
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942
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|
802 } |
| 342 | 803 } |
| 804 prev_p = p; | |
|
2133
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805 p += obj_size; |
|
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|
806 } |
|
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diff
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|
807 |
|
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|
808 if (p != top()) { |
|
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diff
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|
809 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
|
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|
810 "does not match top "PTR_FORMAT, p, top()); |
|
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diff
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|
811 *failures = true; |
|
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|
812 return; |
| 342 | 813 } |
|
2133
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|
814 |
|
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|
815 HeapWord* the_end = end(); |
|
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|
816 assert(p == top(), "it should still hold"); |
|
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817 // Do some extra BOT consistency checking for addresses in the |
|
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818 // range [top, end). BOT look-ups in this range should yield |
|
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819 // top. No point in doing that if top == end (there's nothing there). |
|
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|
820 if (p < the_end) { |
|
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|
821 // Look up top |
|
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|
822 HeapWord* addr_1 = p; |
|
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|
823 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
|
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|
824 if (b_start_1 != p) { |
|
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diff
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|
825 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
|
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|
826 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
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|
827 addr_1, b_start_1, p); |
|
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|
828 *failures = true; |
|
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parents:
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diff
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|
829 return; |
|
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diff
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|
830 } |
|
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|
831 |
|
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|
832 // Look up top + 1 |
|
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833 HeapWord* addr_2 = p + 1; |
|
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|
834 if (addr_2 < the_end) { |
|
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835 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
|
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836 if (b_start_2 != p) { |
|
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837 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
|
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|
838 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
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|
839 addr_2, b_start_2, p); |
|
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diff
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|
840 *failures = true; |
|
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|
841 return; |
|
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|
842 } |
|
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|
843 } |
|
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|
844 |
|
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|
845 // Look up an address between top and end |
|
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|
846 size_t diff = pointer_delta(the_end, p) / 2; |
|
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847 HeapWord* addr_3 = p + diff; |
|
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|
848 if (addr_3 < the_end) { |
|
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1972
diff
changeset
|
849 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
|
2250ee17e258
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diff
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|
850 if (b_start_3 != p) { |
|
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diff
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|
851 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
|
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diff
changeset
|
852 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
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parents:
1972
diff
changeset
|
853 addr_3, b_start_3, p); |
|
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1972
diff
changeset
|
854 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
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|
855 return; |
|
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parents:
1972
diff
changeset
|
856 } |
|
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parents:
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diff
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|
857 } |
|
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parents:
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diff
changeset
|
858 |
|
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parents:
1972
diff
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|
859 // Loook up end - 1 |
|
2250ee17e258
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diff
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|
860 HeapWord* addr_4 = the_end - 1; |
|
2250ee17e258
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|
861 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
|
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1972
diff
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|
862 if (b_start_4 != p) { |
|
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diff
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|
863 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
|
2250ee17e258
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diff
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|
864 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
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diff
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|
865 addr_4, b_start_4, p); |
|
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1972
diff
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|
866 *failures = true; |
|
2250ee17e258
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parents:
1972
diff
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|
867 return; |
|
1020
ff2402f6a50b
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tonyp
parents:
942
diff
changeset
|
868 } |
| 342 | 869 } |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
870 |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
871 if (is_humongous && object_num > 1) { |
|
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
872 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
|
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
873 "but has "SIZE_FORMAT", objects", |
|
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
874 bottom(), end(), object_num); |
|
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
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1705
diff
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|
875 *failures = true; |
|
1020
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942
diff
changeset
|
876 return; |
| 342 | 877 } |
| 878 } | |
| 879 | |
| 880 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
| 881 // away eventually. | |
| 882 | |
| 356 | 883 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 342 | 884 // false ==> we'll do the clearing if there's clearing to be done. |
| 356 | 885 ContiguousSpace::initialize(mr, false, mangle_space); |
| 342 | 886 _offsets.zero_bottom_entry(); |
| 887 _offsets.initialize_threshold(); | |
| 356 | 888 if (clear_space) clear(mangle_space); |
| 342 | 889 } |
| 890 | |
| 356 | 891 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
| 892 ContiguousSpace::clear(mangle_space); | |
| 342 | 893 _offsets.zero_bottom_entry(); |
| 894 _offsets.initialize_threshold(); | |
| 895 } | |
| 896 | |
| 897 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 898 Space::set_bottom(new_bottom); | |
| 899 _offsets.set_bottom(new_bottom); | |
| 900 } | |
| 901 | |
| 902 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 903 Space::set_end(new_end); | |
| 904 _offsets.resize(new_end - bottom()); | |
| 905 } | |
| 906 | |
| 907 void G1OffsetTableContigSpace::print() const { | |
| 908 print_short(); | |
| 909 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 910 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 911 bottom(), top(), _offsets.threshold(), end()); | |
| 912 } | |
| 913 | |
| 914 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 915 return _offsets.initialize_threshold(); | |
| 916 } | |
| 917 | |
| 918 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 919 HeapWord* end) { | |
| 920 _offsets.alloc_block(start, end); | |
| 921 return _offsets.threshold(); | |
| 922 } | |
| 923 | |
| 924 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 925 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 926 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
| 927 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
| 928 return top(); | |
| 929 else | |
| 930 return ContiguousSpace::saved_mark_word(); | |
| 931 } | |
| 932 | |
| 933 void G1OffsetTableContigSpace::set_saved_mark() { | |
| 934 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 935 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 936 | |
| 937 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 938 // The order of these is important, as another thread might be | |
| 939 // about to start scanning this region. If it does so after | |
| 940 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 941 // will be false, and it will pick up top() as the high water mark | |
| 942 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 943 // will pick up the right saved_mark_word() as the high water mark | |
| 944 // of the region. Either way, the behaviour will be correct. | |
| 945 ContiguousSpace::set_saved_mark(); | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
946 OrderAccess::storestore(); |
|
353
9bb2c10ac07b
6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents:
342
diff
changeset
|
947 _gc_time_stamp = curr_gc_time_stamp; |
|
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
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2152
diff
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|
948 // No need to do another barrier to flush the writes above. If |
|
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|
949 // this is called in parallel with other threads trying to |
|
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7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
950 // allocate into the region, the caller should call this while |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2152
diff
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|
951 // holding a lock and when the lock is released the writes will be |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2152
diff
changeset
|
952 // flushed. |
| 342 | 953 } |
| 954 } | |
| 955 | |
| 956 G1OffsetTableContigSpace:: | |
| 957 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 958 MemRegion mr, bool is_zeroed) : | |
| 959 _offsets(sharedOffsetArray, mr), | |
| 960 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 961 _gc_time_stamp(0) | |
| 962 { | |
| 963 _offsets.set_space(this); | |
| 356 | 964 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 342 | 965 } |