Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 2433:abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
7023151: G1: refactor the code that operates on _cur_alloc_region to be re-used for allocs by the GC threads
7018286: G1: humongous allocation attempts should take the GC locker into account
Summary: First, this change replaces the asymmetric locking scheme in the G1 slow alloc path by a summetric one. Second, it factors out the code that operates on _cur_alloc_region so that it can be re-used for allocations by the GC threads in the future.
Reviewed-by: stefank, brutisso, johnc
| author | tonyp |
|---|---|
| date | Wed, 30 Mar 2011 10:26:59 -0400 |
| parents | 0fa27f37d4d4 |
| children | 0654ee04b214 063382f9b575 |
| 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; | |
| 811 | 63 bool _use_prev_marking; |
| 342 | 64 public: |
| 811 | 65 // use_prev_marking == true -> use "prev" marking information, |
| 66 // use_prev_marking == false -> use "next" marking information | |
| 67 VerifyLiveClosure(G1CollectedHeap* g1h, bool use_prev_marking) : | |
| 342 | 68 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
| 811 | 69 _failures(false), _n_failures(0), _use_prev_marking(use_prev_marking) |
| 342 | 70 { |
| 71 BarrierSet* bs = _g1h->barrier_set(); | |
| 72 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 73 _bs = (CardTableModRefBS*)bs; | |
| 74 } | |
| 75 | |
| 76 void set_containing_obj(oop obj) { | |
| 77 _containing_obj = obj; | |
| 78 } | |
| 79 | |
| 80 bool failures() { return _failures; } | |
| 81 int n_failures() { return _n_failures; } | |
| 82 | |
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83 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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84 virtual void do_oop( oop* p) { do_oop_work(p); } |
| 342 | 85 |
| 1388 | 86 void print_object(outputStream* out, oop obj) { |
| 87 #ifdef PRODUCT | |
| 88 klassOop k = obj->klass(); | |
| 89 const char* class_name = instanceKlass::cast(k)->external_name(); | |
| 90 out->print_cr("class name %s", class_name); | |
| 91 #else // PRODUCT | |
| 92 obj->print_on(out); | |
| 93 #endif // PRODUCT | |
| 94 } | |
| 95 | |
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96 template <class T> void do_oop_work(T* p) { |
| 342 | 97 assert(_containing_obj != NULL, "Precondition"); |
| 811 | 98 assert(!_g1h->is_obj_dead_cond(_containing_obj, _use_prev_marking), |
| 99 "Precondition"); | |
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100 T heap_oop = oopDesc::load_heap_oop(p); |
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101 if (!oopDesc::is_null(heap_oop)) { |
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102 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 103 bool failed = false; |
| 811 | 104 if (!_g1h->is_in_closed_subset(obj) || |
| 105 _g1h->is_obj_dead_cond(obj, _use_prev_marking)) { | |
| 342 | 106 if (!_failures) { |
| 107 gclog_or_tty->print_cr(""); | |
| 108 gclog_or_tty->print_cr("----------"); | |
| 109 } | |
| 110 if (!_g1h->is_in_closed_subset(obj)) { | |
| 1388 | 111 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
| 342 | 112 gclog_or_tty->print_cr("Field "PTR_FORMAT |
| 1388 | 113 " of live obj "PTR_FORMAT" in region " |
| 114 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 115 p, (void*) _containing_obj, | |
| 116 from->bottom(), from->end()); | |
| 117 print_object(gclog_or_tty, _containing_obj); | |
| 118 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 119 (void*) obj); | |
| 120 } else { | |
| 121 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 122 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 123 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 124 " of live obj "PTR_FORMAT" in region " | |
| 125 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 126 p, (void*) _containing_obj, | |
| 127 from->bottom(), from->end()); | |
| 128 print_object(gclog_or_tty, _containing_obj); | |
| 129 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 130 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 131 (void*) obj, to->bottom(), to->end()); | |
| 132 print_object(gclog_or_tty, obj); | |
| 342 | 133 } |
| 134 gclog_or_tty->print_cr("----------"); | |
| 135 _failures = true; | |
| 136 failed = true; | |
| 137 _n_failures++; | |
| 138 } | |
| 139 | |
| 140 if (!_g1h->full_collection()) { | |
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141 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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142 HeapRegion* to = _g1h->heap_region_containing(obj); |
| 342 | 143 if (from != NULL && to != NULL && |
| 144 from != to && | |
| 145 !to->isHumongous()) { | |
| 146 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 147 jbyte cv_field = *_bs->byte_for_const(p); | |
| 148 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 149 | |
| 150 bool is_bad = !(from->is_young() | |
| 151 || to->rem_set()->contains_reference(p) | |
| 152 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 153 (_containing_obj->is_objArray() ? | |
| 154 cv_field == dirty | |
| 155 : cv_obj == dirty || cv_field == dirty)); | |
| 156 if (is_bad) { | |
| 157 if (!_failures) { | |
| 158 gclog_or_tty->print_cr(""); | |
| 159 gclog_or_tty->print_cr("----------"); | |
| 160 } | |
| 161 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 162 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 163 " of obj "PTR_FORMAT | |
| 164 ", in region %d ["PTR_FORMAT | |
| 165 ", "PTR_FORMAT"),", | |
| 166 p, (void*) _containing_obj, | |
| 167 from->hrs_index(), | |
| 168 from->bottom(), | |
| 169 from->end()); | |
| 170 _containing_obj->print_on(gclog_or_tty); | |
| 171 gclog_or_tty->print_cr("points to obj "PTR_FORMAT | |
| 172 " in region %d ["PTR_FORMAT | |
| 173 ", "PTR_FORMAT").", | |
| 174 (void*) obj, to->hrs_index(), | |
| 175 to->bottom(), to->end()); | |
| 176 obj->print_on(gclog_or_tty); | |
| 177 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 178 cv_obj, cv_field); | |
| 179 gclog_or_tty->print_cr("----------"); | |
| 180 _failures = true; | |
| 181 if (!failed) _n_failures++; | |
| 182 } | |
| 183 } | |
| 184 } | |
| 185 } | |
| 186 } | |
| 187 }; | |
| 188 | |
| 189 template<class ClosureType> | |
| 190 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
| 191 HeapRegion* hr, | |
| 192 HeapWord* cur, HeapWord* top) { | |
| 193 oop cur_oop = oop(cur); | |
| 194 int oop_size = cur_oop->size(); | |
| 195 HeapWord* next_obj = cur + oop_size; | |
| 196 while (next_obj < top) { | |
| 197 // Keep filtering the remembered set. | |
| 198 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
| 199 // Bottom lies entirely below top, so we can call the | |
| 200 // non-memRegion version of oop_iterate below. | |
| 201 cur_oop->oop_iterate(cl); | |
| 202 } | |
| 203 cur = next_obj; | |
| 204 cur_oop = oop(cur); | |
| 205 oop_size = cur_oop->size(); | |
| 206 next_obj = cur + oop_size; | |
| 207 } | |
| 208 return cur; | |
| 209 } | |
| 210 | |
| 211 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
| 212 HeapWord* bottom, | |
| 213 HeapWord* top, | |
| 214 OopClosure* cl) { | |
| 215 G1CollectedHeap* g1h = _g1; | |
| 216 | |
| 217 int oop_size; | |
| 218 | |
| 219 OopClosure* cl2 = cl; | |
| 220 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
| 221 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
| 222 switch (_fk) { | |
| 223 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
| 224 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
| 225 } | |
| 226 | |
| 227 // Start filtering what we add to the remembered set. If the object is | |
| 228 // not considered dead, either because it is marked (in the mark bitmap) | |
| 229 // or it was allocated after marking finished, then we add it. Otherwise | |
| 230 // we can safely ignore the object. | |
| 231 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 232 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 233 } else { | |
| 234 oop_size = oop(bottom)->size(); | |
| 235 } | |
| 236 | |
| 237 bottom += oop_size; | |
| 238 | |
| 239 if (bottom < top) { | |
| 240 // We replicate the loop below for several kinds of possible filters. | |
| 241 switch (_fk) { | |
| 242 case NoFilterKind: | |
| 243 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
| 244 break; | |
| 245 case IntoCSFilterKind: { | |
| 246 FilterIntoCSClosure filt(this, g1h, cl); | |
| 247 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 248 break; | |
| 249 } | |
| 250 case OutOfRegionFilterKind: { | |
| 251 FilterOutOfRegionClosure filt(_hr, cl); | |
| 252 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 253 break; | |
| 254 } | |
| 255 default: | |
| 256 ShouldNotReachHere(); | |
| 257 } | |
| 258 | |
| 259 // Last object. Need to do dead-obj filtering here too. | |
| 260 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 261 oop(bottom)->oop_iterate(cl2, mr); | |
| 262 } | |
| 263 } | |
| 264 } | |
| 265 | |
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266 // Minimum region size; we won't go lower than that. |
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267 // We might want to decrease this in the future, to deal with small |
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268 // heaps a bit more efficiently. |
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269 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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270 |
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271 // Maximum region size; we don't go higher than that. There's a good |
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272 // reason for having an upper bound. We don't want regions to get too |
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273 // large, otherwise cleanup's effectiveness would decrease as there |
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274 // will be fewer opportunities to find totally empty regions after |
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275 // marking. |
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276 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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277 |
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278 // The automatic region size calculation will try to have around this |
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279 // many regions in the heap (based on the min heap size). |
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280 #define TARGET_REGION_NUMBER 2048 |
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281 |
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282 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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283 // region_size in bytes |
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284 uintx region_size = G1HeapRegionSize; |
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285 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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286 // We base the automatic calculation on the min heap size. This |
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287 // can be problematic if the spread between min and max is quite |
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288 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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289 // the max size, the region size might be way too large for the |
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290 // min size. Either way, some users might have to set the region |
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291 // size manually for some -Xms / -Xmx combos. |
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292 |
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293 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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294 (uintx) MIN_REGION_SIZE); |
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295 } |
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296 |
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297 int region_size_log = log2_long((jlong) region_size); |
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298 // Recalculate the region size to make sure it's a power of |
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299 // 2. This means that region_size is the largest power of 2 that's |
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300 // <= what we've calculated so far. |
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301 region_size = ((uintx)1 << region_size_log); |
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302 |
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303 // Now make sure that we don't go over or under our limits. |
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304 if (region_size < MIN_REGION_SIZE) { |
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305 region_size = MIN_REGION_SIZE; |
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306 } else if (region_size > MAX_REGION_SIZE) { |
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307 region_size = MAX_REGION_SIZE; |
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308 } |
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309 |
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310 // And recalculate the log. |
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311 region_size_log = log2_long((jlong) region_size); |
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312 |
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313 // Now, set up the globals. |
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314 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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315 LogOfHRGrainBytes = region_size_log; |
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316 |
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317 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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318 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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319 |
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320 guarantee(GrainBytes == 0, "we should only set it once"); |
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321 // The cast to int is safe, given that we've bounded region_size by |
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322 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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323 GrainBytes = (int) region_size; |
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324 |
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325 guarantee(GrainWords == 0, "we should only set it once"); |
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326 GrainWords = GrainBytes >> LogHeapWordSize; |
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327 guarantee(1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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328 |
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329 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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330 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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331 } |
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332 |
| 342 | 333 void HeapRegion::reset_after_compaction() { |
| 334 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 335 // After a compaction the mark bitmap is invalid, so we must | |
| 336 // treat all objects as being inside the unmarked area. | |
| 337 zero_marked_bytes(); | |
| 338 init_top_at_mark_start(); | |
| 339 } | |
| 340 | |
| 341 DirtyCardToOopClosure* | |
| 342 HeapRegion::new_dcto_closure(OopClosure* cl, | |
| 343 CardTableModRefBS::PrecisionStyle precision, | |
| 344 HeapRegionDCTOC::FilterKind fk) { | |
| 345 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
| 346 this, cl, precision, fk); | |
| 347 } | |
| 348 | |
| 349 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
| 2152 | 350 assert(_humongous_type == NotHumongous, |
| 351 "we should have already filtered out humongous regions"); | |
| 352 assert(_humongous_start_region == NULL, | |
| 353 "we should have already filtered out humongous regions"); | |
| 354 assert(_end == _orig_end, | |
| 355 "we should have already filtered out humongous regions"); | |
| 356 | |
| 342 | 357 _in_collection_set = false; |
| 358 _is_gc_alloc_region = false; | |
| 359 | |
| 360 set_young_index_in_cset(-1); | |
| 361 uninstall_surv_rate_group(); | |
| 362 set_young_type(NotYoung); | |
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363 reset_pre_dummy_top(); |
| 342 | 364 |
| 365 if (!par) { | |
| 366 // If this is parallel, this will be done later. | |
| 367 HeapRegionRemSet* hrrs = rem_set(); | |
| 368 if (hrrs != NULL) hrrs->clear(); | |
| 355 | 369 _claimed = InitialClaimValue; |
| 342 | 370 } |
| 371 zero_marked_bytes(); | |
| 372 set_sort_index(-1); | |
| 373 | |
| 374 _offsets.resize(HeapRegion::GrainWords); | |
| 375 init_top_at_mark_start(); | |
| 356 | 376 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 377 } |
| 378 | |
| 379 // <PREDICTION> | |
| 380 void HeapRegion::calc_gc_efficiency() { | |
| 381 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 382 _gc_efficiency = (double) garbage_bytes() / | |
| 383 g1h->predict_region_elapsed_time_ms(this, false); | |
| 384 } | |
| 385 // </PREDICTION> | |
| 386 | |
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387 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
| 2152 | 388 assert(!isHumongous(), "sanity / pre-condition"); |
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389 assert(end() == _orig_end, |
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390 "Should be normal before the humongous object allocation"); |
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391 assert(top() == bottom(), "should be empty"); |
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392 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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393 |
| 355 | 394 _humongous_type = StartsHumongous; |
| 342 | 395 _humongous_start_region = this; |
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396 |
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397 set_end(new_end); |
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398 _offsets.set_for_starts_humongous(new_top); |
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399 } |
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400 |
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401 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
| 2152 | 402 assert(!isHumongous(), "sanity / pre-condition"); |
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403 assert(end() == _orig_end, |
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404 "Should be normal before the humongous object allocation"); |
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405 assert(top() == bottom(), "should be empty"); |
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406 assert(first_hr->startsHumongous(), "pre-condition"); |
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407 |
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408 _humongous_type = ContinuesHumongous; |
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409 _humongous_start_region = first_hr; |
| 342 | 410 } |
| 411 | |
| 2152 | 412 void HeapRegion::set_notHumongous() { |
| 413 assert(isHumongous(), "pre-condition"); | |
| 414 | |
| 415 if (startsHumongous()) { | |
| 416 assert(top() <= end(), "pre-condition"); | |
| 417 set_end(_orig_end); | |
| 418 if (top() > end()) { | |
| 419 // at least one "continues humongous" region after it | |
| 420 set_top(end()); | |
| 421 } | |
| 422 } else { | |
| 423 // continues humongous | |
| 424 assert(end() == _orig_end, "sanity"); | |
| 425 } | |
| 426 | |
| 427 assert(capacity() == (size_t) HeapRegion::GrainBytes, "pre-condition"); | |
| 428 _humongous_type = NotHumongous; | |
| 429 _humongous_start_region = NULL; | |
| 430 } | |
| 431 | |
| 342 | 432 bool HeapRegion::claimHeapRegion(jint claimValue) { |
| 433 jint current = _claimed; | |
| 434 if (current != claimValue) { | |
| 435 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 436 if (res == current) { | |
| 437 return true; | |
| 438 } | |
| 439 } | |
| 440 return false; | |
| 441 } | |
| 442 | |
| 443 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
| 444 HeapWord* low = addr; | |
| 445 HeapWord* high = end(); | |
| 446 while (low < high) { | |
| 447 size_t diff = pointer_delta(high, low); | |
| 448 // Must add one below to bias toward the high amount. Otherwise, if | |
| 449 // "high" were at the desired value, and "low" were one less, we | |
| 450 // would not converge on "high". This is not symmetric, because | |
| 451 // we set "high" to a block start, which might be the right one, | |
| 452 // which we don't do for "low". | |
| 453 HeapWord* middle = low + (diff+1)/2; | |
| 454 if (middle == high) return high; | |
| 455 HeapWord* mid_bs = block_start_careful(middle); | |
| 456 if (mid_bs < addr) { | |
| 457 low = middle; | |
| 458 } else { | |
| 459 high = mid_bs; | |
| 460 } | |
| 461 } | |
| 462 assert(low == high && low >= addr, "Didn't work."); | |
| 463 return low; | |
| 464 } | |
| 465 | |
| 356 | 466 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 467 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
| 342 | 468 hr_clear(false/*par*/, clear_space); |
| 469 } | |
| 470 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 471 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 472 #endif // _MSC_VER | |
| 473 | |
| 474 | |
| 475 HeapRegion:: | |
| 476 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 477 MemRegion mr, bool is_zeroed) | |
| 478 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), | |
| 479 _next_fk(HeapRegionDCTOC::NoFilterKind), | |
| 480 _hrs_index(-1), | |
| 355 | 481 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
| 342 | 482 _in_collection_set(false), _is_gc_alloc_region(false), |
| 483 _next_in_special_set(NULL), _orig_end(NULL), | |
| 355 | 484 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 342 | 485 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
| 486 _young_type(NotYoung), _next_young_region(NULL), | |
| 2152 | 487 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
| 488 #ifdef ASSERT | |
| 489 _containing_set(NULL), | |
| 490 #endif // ASSERT | |
| 491 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
| 492 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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493 _predicted_bytes_to_copy(0) |
| 342 | 494 { |
| 495 _orig_end = mr.end(); | |
| 496 // Note that initialize() will set the start of the unmarked area of the | |
| 497 // region. | |
| 356 | 498 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 499 set_top(bottom()); | |
| 500 set_saved_mark(); | |
| 342 | 501 |
| 502 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
| 503 | |
| 504 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
| 505 // In case the region is allocated during a pause, note the top. | |
| 506 // We haven't done any counting on a brand new region. | |
| 507 _top_at_conc_mark_count = bottom(); | |
| 508 } | |
| 509 | |
| 510 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
| 511 const HeapRegion* _target; | |
| 512 bool _target_seen; | |
| 513 HeapRegion* _last; | |
| 514 CompactibleSpace* _res; | |
| 515 public: | |
| 516 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
| 517 _target(target), _target_seen(false), _res(NULL) {} | |
| 518 bool doHeapRegion(HeapRegion* cur) { | |
| 519 if (_target_seen) { | |
| 520 if (!cur->isHumongous()) { | |
| 521 _res = cur; | |
| 522 return true; | |
| 523 } | |
| 524 } else if (cur == _target) { | |
| 525 _target_seen = true; | |
| 526 } | |
| 527 return false; | |
| 528 } | |
| 529 CompactibleSpace* result() { return _res; } | |
| 530 }; | |
| 531 | |
| 532 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
| 533 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 534 // cast away const-ness | |
| 535 HeapRegion* r = (HeapRegion*) this; | |
| 536 NextCompactionHeapRegionClosure blk(r); | |
| 537 g1h->heap_region_iterate_from(r, &blk); | |
| 538 return blk.result(); | |
| 539 } | |
| 540 | |
| 541 void HeapRegion::save_marks() { | |
| 542 set_saved_mark(); | |
| 543 } | |
| 544 | |
| 545 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
| 546 HeapWord* p = mr.start(); | |
| 547 HeapWord* e = mr.end(); | |
| 548 oop obj; | |
| 549 while (p < e) { | |
| 550 obj = oop(p); | |
| 551 p += obj->oop_iterate(cl); | |
| 552 } | |
| 553 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
| 554 } | |
| 555 | |
| 556 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 557 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
| 558 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 559 } | |
| 560 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 561 | |
| 562 | |
| 563 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
| 564 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
| 565 } | |
| 566 | |
| 567 HeapWord* | |
| 568 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 569 ObjectClosure* cl) { | |
| 570 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 571 // We used to use "block_start_careful" here. But we're actually happy | |
| 572 // to update the BOT while we do this... | |
| 573 HeapWord* cur = block_start(mr.start()); | |
| 574 mr = mr.intersection(used_region()); | |
| 575 if (mr.is_empty()) return NULL; | |
| 576 // Otherwise, find the obj that extends onto mr.start(). | |
| 577 | |
| 578 assert(cur <= mr.start() | |
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579 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 580 cur + oop(cur)->size() > mr.start()), |
| 581 "postcondition of block_start"); | |
| 582 oop obj; | |
| 583 while (cur < mr.end()) { | |
| 584 obj = oop(cur); | |
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585 if (obj->klass_or_null() == NULL) { |
| 342 | 586 // Ran into an unparseable point. |
| 587 return cur; | |
| 588 } else if (!g1h->is_obj_dead(obj)) { | |
| 589 cl->do_object(obj); | |
| 590 } | |
| 591 if (cl->abort()) return cur; | |
| 592 // The check above must occur before the operation below, since an | |
| 593 // abort might invalidate the "size" operation. | |
| 594 cur += obj->size(); | |
| 595 } | |
| 596 return NULL; | |
| 597 } | |
| 598 | |
| 599 HeapWord* | |
| 600 HeapRegion:: | |
| 601 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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602 FilterOutOfRegionClosure* cl, |
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603 bool filter_young) { |
| 342 | 604 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 605 | |
| 606 // If we're within a stop-world GC, then we might look at a card in a | |
| 607 // GC alloc region that extends onto a GC LAB, which may not be | |
| 608 // parseable. Stop such at the "saved_mark" of the region. | |
| 609 if (G1CollectedHeap::heap()->is_gc_active()) { | |
| 610 mr = mr.intersection(used_region_at_save_marks()); | |
| 611 } else { | |
| 612 mr = mr.intersection(used_region()); | |
| 613 } | |
| 614 if (mr.is_empty()) return NULL; | |
| 615 // Otherwise, find the obj that extends onto mr.start(). | |
| 616 | |
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617 // The intersection of the incoming mr (for the card) and the |
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618 // allocated part of the region is non-empty. This implies that |
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619 // 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
johnc
parents:
1552
diff
changeset
|
620 // G1CollectedHeap.cpp that allocates a new region sets the |
|
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
1552
diff
changeset
|
621 // 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
johnc
parents:
1552
diff
changeset
|
622 // safely know if this region is young. |
|
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
1552
diff
changeset
|
623 if (is_young() && filter_young) { |
|
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
1552
diff
changeset
|
624 return NULL; |
|
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
1552
diff
changeset
|
625 } |
|
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
1552
diff
changeset
|
626 |
| 1705 | 627 assert(!is_young(), "check value of filter_young"); |
| 628 | |
| 342 | 629 // We used to use "block_start_careful" here. But we're actually happy |
| 630 // to update the BOT while we do this... | |
| 631 HeapWord* cur = block_start(mr.start()); | |
| 632 assert(cur <= mr.start(), "Postcondition"); | |
| 633 | |
| 634 while (cur <= mr.start()) { | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
635 if (oop(cur)->klass_or_null() == NULL) { |
| 342 | 636 // Ran into an unparseable point. |
| 637 return cur; | |
| 638 } | |
| 639 // Otherwise... | |
| 640 int sz = oop(cur)->size(); | |
| 641 if (cur + sz > mr.start()) break; | |
| 642 // Otherwise, go on. | |
| 643 cur = cur + sz; | |
| 644 } | |
| 645 oop obj; | |
| 646 obj = oop(cur); | |
| 647 // If we finish this loop... | |
| 648 assert(cur <= mr.start() | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
649 && obj->klass_or_null() != NULL |
| 342 | 650 && cur + obj->size() > mr.start(), |
| 651 "Loop postcondition"); | |
| 652 if (!g1h->is_obj_dead(obj)) { | |
| 653 obj->oop_iterate(cl, mr); | |
| 654 } | |
| 655 | |
| 656 HeapWord* next; | |
| 657 while (cur < mr.end()) { | |
| 658 obj = oop(cur); | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
659 if (obj->klass_or_null() == NULL) { |
| 342 | 660 // Ran into an unparseable point. |
| 661 return cur; | |
| 662 }; | |
| 663 // Otherwise: | |
| 664 next = (cur + obj->size()); | |
| 665 if (!g1h->is_obj_dead(obj)) { | |
| 666 if (next < mr.end()) { | |
| 667 obj->oop_iterate(cl); | |
| 668 } else { | |
| 669 // this obj spans the boundary. If it's an array, stop at the | |
| 670 // boundary. | |
| 671 if (obj->is_objArray()) { | |
| 672 obj->oop_iterate(cl, mr); | |
| 673 } else { | |
| 674 obj->oop_iterate(cl); | |
| 675 } | |
| 676 } | |
| 677 } | |
| 678 cur = next; | |
| 679 } | |
| 680 return NULL; | |
| 681 } | |
| 682 | |
| 683 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
| 684 void HeapRegion::print_on(outputStream* st) const { | |
| 685 if (isHumongous()) { | |
| 686 if (startsHumongous()) | |
| 687 st->print(" HS"); | |
| 688 else | |
| 689 st->print(" HC"); | |
| 690 } else { | |
| 691 st->print(" "); | |
| 692 } | |
| 693 if (in_collection_set()) | |
| 694 st->print(" CS"); | |
| 695 else if (is_gc_alloc_region()) | |
| 696 st->print(" A "); | |
| 697 else | |
| 698 st->print(" "); | |
| 699 if (is_young()) | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1388
diff
changeset
|
700 st->print(is_survivor() ? " SU" : " Y "); |
| 342 | 701 else |
| 702 st->print(" "); | |
| 703 if (is_empty()) | |
| 704 st->print(" F"); | |
| 705 else | |
| 706 st->print(" "); | |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
707 st->print(" %5d", _gc_time_stamp); |
| 1388 | 708 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 709 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 710 G1OffsetTableContigSpace::print_on(st); |
| 711 } | |
| 712 | |
| 811 | 713 void HeapRegion::verify(bool allow_dirty) const { |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
714 bool dummy = false; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
715 verify(allow_dirty, /* use_prev_marking */ true, /* failures */ &dummy); |
| 811 | 716 } |
| 717 | |
| 342 | 718 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
| 719 // We would need a mechanism to make that code skip dead objects. | |
| 720 | |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
721 void HeapRegion::verify(bool allow_dirty, |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
722 bool use_prev_marking, |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
723 bool* failures) const { |
| 342 | 724 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
725 *failures = false; |
| 342 | 726 HeapWord* p = bottom(); |
| 727 HeapWord* prev_p = NULL; | |
| 811 | 728 VerifyLiveClosure vl_cl(g1, use_prev_marking); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
729 bool is_humongous = isHumongous(); |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
730 bool do_bot_verify = !is_young(); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
731 size_t object_num = 0; |
| 342 | 732 while (p < top()) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
733 oop obj = oop(p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
734 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
735 object_num += 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
736 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
737 if (is_humongous != g1->isHumongous(obj_size)) { |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
738 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
|
739 SIZE_FORMAT" words) in a %shumongous region", |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
740 p, g1->isHumongous(obj_size) ? "" : "non-", |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
741 obj_size, is_humongous ? "" : "non-"); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
742 *failures = true; |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
743 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
744 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
745 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
746 // 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
|
747 // appropriate messasge. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
748 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
|
749 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
750 return; |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
751 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
752 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
753 if (!g1->is_obj_dead_cond(obj, this, use_prev_marking)) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
754 if (obj->is_oop()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
755 klassOop klass = obj->klass(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
756 if (!klass->is_perm()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
757 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
|
758 "not in perm", klass, obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
759 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
760 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
761 } else if (!klass->is_klass()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
762 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
|
763 "not a klass", klass, obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
764 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
765 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
766 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
767 vl_cl.set_containing_obj(obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
768 obj->oop_iterate(&vl_cl); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
769 if (vl_cl.failures()) { |
|
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 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
772 if (G1MaxVerifyFailures >= 0 && |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
773 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
774 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
775 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
776 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
777 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
778 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
779 *failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
780 return; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
781 } |
| 342 | 782 } |
| 783 prev_p = p; | |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
784 p += obj_size; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
785 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
786 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
787 if (p != top()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
788 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
789 "does not match top "PTR_FORMAT, p, top()); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
790 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
791 return; |
| 342 | 792 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
793 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
794 HeapWord* the_end = end(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
795 assert(p == top(), "it should still hold"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
796 // Do some extra BOT consistency checking for addresses in the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
797 // range [top, end). BOT look-ups in this range should yield |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
798 // top. No point in doing that if top == end (there's nothing there). |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
799 if (p < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
800 // Look up top |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
801 HeapWord* addr_1 = p; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
802 HeapWord* b_start_1 = _offsets.block_start_const(addr_1); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
803 if (b_start_1 != p) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
804 gclog_or_tty->print_cr("BOT look up for top: "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
805 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
806 addr_1, b_start_1, p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
807 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
808 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
809 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
810 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
811 // Look up top + 1 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
812 HeapWord* addr_2 = p + 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
813 if (addr_2 < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
814 HeapWord* b_start_2 = _offsets.block_start_const(addr_2); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
815 if (b_start_2 != p) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
816 gclog_or_tty->print_cr("BOT look up for top + 1: "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
817 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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818 addr_2, b_start_2, p); |
|
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819 *failures = true; |
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820 return; |
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821 } |
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822 } |
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823 |
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824 // Look up an address between top and end |
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825 size_t diff = pointer_delta(the_end, p) / 2; |
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826 HeapWord* addr_3 = p + diff; |
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827 if (addr_3 < the_end) { |
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828 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
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829 if (b_start_3 != p) { |
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830 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
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831 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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832 addr_3, b_start_3, p); |
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833 *failures = true; |
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834 return; |
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835 } |
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836 } |
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837 |
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838 // Loook up end - 1 |
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839 HeapWord* addr_4 = the_end - 1; |
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840 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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841 if (b_start_4 != p) { |
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842 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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843 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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844 addr_4, b_start_4, p); |
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845 *failures = true; |
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846 return; |
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847 } |
| 342 | 848 } |
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849 |
|
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850 if (is_humongous && object_num > 1) { |
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851 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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852 "but has "SIZE_FORMAT", objects", |
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853 bottom(), end(), object_num); |
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854 *failures = true; |
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855 return; |
| 342 | 856 } |
| 857 } | |
| 858 | |
| 859 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
| 860 // away eventually. | |
| 861 | |
| 356 | 862 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 342 | 863 // false ==> we'll do the clearing if there's clearing to be done. |
| 356 | 864 ContiguousSpace::initialize(mr, false, mangle_space); |
| 342 | 865 _offsets.zero_bottom_entry(); |
| 866 _offsets.initialize_threshold(); | |
| 356 | 867 if (clear_space) clear(mangle_space); |
| 342 | 868 } |
| 869 | |
| 356 | 870 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
| 871 ContiguousSpace::clear(mangle_space); | |
| 342 | 872 _offsets.zero_bottom_entry(); |
| 873 _offsets.initialize_threshold(); | |
| 874 } | |
| 875 | |
| 876 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 877 Space::set_bottom(new_bottom); | |
| 878 _offsets.set_bottom(new_bottom); | |
| 879 } | |
| 880 | |
| 881 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 882 Space::set_end(new_end); | |
| 883 _offsets.resize(new_end - bottom()); | |
| 884 } | |
| 885 | |
| 886 void G1OffsetTableContigSpace::print() const { | |
| 887 print_short(); | |
| 888 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 889 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 890 bottom(), top(), _offsets.threshold(), end()); | |
| 891 } | |
| 892 | |
| 893 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 894 return _offsets.initialize_threshold(); | |
| 895 } | |
| 896 | |
| 897 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 898 HeapWord* end) { | |
| 899 _offsets.alloc_block(start, end); | |
| 900 return _offsets.threshold(); | |
| 901 } | |
| 902 | |
| 903 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 904 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 905 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
| 906 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
| 907 return top(); | |
| 908 else | |
| 909 return ContiguousSpace::saved_mark_word(); | |
| 910 } | |
| 911 | |
| 912 void G1OffsetTableContigSpace::set_saved_mark() { | |
| 913 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 914 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 915 | |
| 916 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 917 // The order of these is important, as another thread might be | |
| 918 // about to start scanning this region. If it does so after | |
| 919 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 920 // will be false, and it will pick up top() as the high water mark | |
| 921 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 922 // will pick up the right saved_mark_word() as the high water mark | |
| 923 // of the region. Either way, the behaviour will be correct. | |
| 924 ContiguousSpace::set_saved_mark(); | |
|
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925 OrderAccess::storestore(); |
|
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926 _gc_time_stamp = curr_gc_time_stamp; |
|
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927 // No need to do another barrier to flush the writes above. If |
|
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928 // this is called in parallel with other threads trying to |
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929 // allocate into the region, the caller should call this while |
|
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930 // holding a lock and when the lock is released the writes will be |
|
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931 // flushed. |
| 342 | 932 } |
| 933 } | |
| 934 | |
| 935 G1OffsetTableContigSpace:: | |
| 936 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 937 MemRegion mr, bool is_zeroed) : | |
| 938 _offsets(sharedOffsetArray, mr), | |
| 939 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 940 _gc_time_stamp(0) | |
| 941 { | |
| 942 _offsets.set_space(this); | |
| 356 | 943 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 342 | 944 } |