Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 6611:7383557659bd
7185699: G1: Prediction model discrepancies
Summary: Correct the result value of G1CollectedHeap::pending_card_num(). Change the code that calculates the GC efficiency of a non-young heap region to use historical data from mixed GCs and the actual number of live bytes when predicting how long it would take to collect the region. Changes were also reviewed by Thomas Schatzl.
Reviewed-by: azeemj, brutisso
| author | johnc |
|---|---|
| date | Tue, 21 Aug 2012 14:10:39 -0700 |
| parents | a2f7274eb6ef |
| children | c38f13903fdf da91efe96a93 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 29 #include "gc_implementation/g1/heapRegion.inline.hpp" | |
| 30 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 31 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 32 #include "memory/genOopClosures.inline.hpp" | |
| 33 #include "memory/iterator.hpp" | |
| 34 #include "oops/oop.inline.hpp" | |
| 342 | 35 |
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36 int HeapRegion::LogOfHRGrainBytes = 0; |
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37 int HeapRegion::LogOfHRGrainWords = 0; |
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38 size_t HeapRegion::GrainBytes = 0; |
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39 size_t HeapRegion::GrainWords = 0; |
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40 size_t HeapRegion::CardsPerRegion = 0; |
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41 |
| 342 | 42 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
| 43 HeapRegion* hr, OopClosure* cl, | |
| 44 CardTableModRefBS::PrecisionStyle precision, | |
| 45 FilterKind fk) : | |
| 46 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
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47 _hr(hr), _fk(fk), _g1(g1) { } |
| 342 | 48 |
| 49 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
| 50 OopClosure* oc) : | |
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51 _r_bottom(r->bottom()), _r_end(r->end()), _oc(oc) { } |
| 342 | 52 |
| 53 class VerifyLiveClosure: public OopClosure { | |
| 811 | 54 private: |
| 342 | 55 G1CollectedHeap* _g1h; |
| 56 CardTableModRefBS* _bs; | |
| 57 oop _containing_obj; | |
| 58 bool _failures; | |
| 59 int _n_failures; | |
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60 VerifyOption _vo; |
| 342 | 61 public: |
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62 // _vo == UsePrevMarking -> use "prev" marking information, |
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63 // _vo == UseNextMarking -> use "next" marking information, |
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64 // _vo == UseMarkWord -> use mark word from object header. |
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65 VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : |
| 342 | 66 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
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67 _failures(false), _n_failures(0), _vo(vo) |
| 342 | 68 { |
| 69 BarrierSet* bs = _g1h->barrier_set(); | |
| 70 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 71 _bs = (CardTableModRefBS*)bs; | |
| 72 } | |
| 73 | |
| 74 void set_containing_obj(oop obj) { | |
| 75 _containing_obj = obj; | |
| 76 } | |
| 77 | |
| 78 bool failures() { return _failures; } | |
| 79 int n_failures() { return _n_failures; } | |
| 80 | |
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81 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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82 virtual void do_oop( oop* p) { do_oop_work(p); } |
| 342 | 83 |
| 1388 | 84 void print_object(outputStream* out, oop obj) { |
| 85 #ifdef PRODUCT | |
| 86 klassOop k = obj->klass(); | |
| 87 const char* class_name = instanceKlass::cast(k)->external_name(); | |
| 88 out->print_cr("class name %s", class_name); | |
| 89 #else // PRODUCT | |
| 90 obj->print_on(out); | |
| 91 #endif // PRODUCT | |
| 92 } | |
| 93 | |
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94 template <class T> |
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95 void do_oop_work(T* p) { |
| 342 | 96 assert(_containing_obj != NULL, "Precondition"); |
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97 assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), |
| 811 | 98 "Precondition"); |
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99 T heap_oop = oopDesc::load_heap_oop(p); |
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100 if (!oopDesc::is_null(heap_oop)) { |
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101 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 102 bool failed = false; |
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103 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { |
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104 MutexLockerEx x(ParGCRareEvent_lock, |
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105 Mutex::_no_safepoint_check_flag); |
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106 |
| 342 | 107 if (!_failures) { |
| 108 gclog_or_tty->print_cr(""); | |
| 109 gclog_or_tty->print_cr("----------"); | |
| 110 } | |
| 111 if (!_g1h->is_in_closed_subset(obj)) { | |
| 1388 | 112 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
| 342 | 113 gclog_or_tty->print_cr("Field "PTR_FORMAT |
| 1388 | 114 " of live obj "PTR_FORMAT" in region " |
| 115 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 116 p, (void*) _containing_obj, | |
| 117 from->bottom(), from->end()); | |
| 118 print_object(gclog_or_tty, _containing_obj); | |
| 119 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 120 (void*) obj); | |
| 121 } else { | |
| 122 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 123 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 124 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 125 " of live obj "PTR_FORMAT" in region " | |
| 126 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 127 p, (void*) _containing_obj, | |
| 128 from->bottom(), from->end()); | |
| 129 print_object(gclog_or_tty, _containing_obj); | |
| 130 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 131 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 132 (void*) obj, to->bottom(), to->end()); | |
| 133 print_object(gclog_or_tty, obj); | |
| 342 | 134 } |
| 135 gclog_or_tty->print_cr("----------"); | |
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136 gclog_or_tty->flush(); |
| 342 | 137 _failures = true; |
| 138 failed = true; | |
| 139 _n_failures++; | |
| 140 } | |
| 141 | |
| 142 if (!_g1h->full_collection()) { | |
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143 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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144 HeapRegion* to = _g1h->heap_region_containing(obj); |
| 342 | 145 if (from != NULL && to != NULL && |
| 146 from != to && | |
| 147 !to->isHumongous()) { | |
| 148 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 149 jbyte cv_field = *_bs->byte_for_const(p); | |
| 150 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 151 | |
| 152 bool is_bad = !(from->is_young() | |
| 153 || to->rem_set()->contains_reference(p) | |
| 154 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 155 (_containing_obj->is_objArray() ? | |
| 156 cv_field == dirty | |
| 157 : cv_obj == dirty || cv_field == dirty)); | |
| 158 if (is_bad) { | |
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159 MutexLockerEx x(ParGCRareEvent_lock, |
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160 Mutex::_no_safepoint_check_flag); |
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161 |
| 342 | 162 if (!_failures) { |
| 163 gclog_or_tty->print_cr(""); | |
| 164 gclog_or_tty->print_cr("----------"); | |
| 165 } | |
| 166 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 3766 | 167 gclog_or_tty->print_cr("Field "PTR_FORMAT" " |
| 168 "of obj "PTR_FORMAT", " | |
| 169 "in region "HR_FORMAT, | |
| 170 p, (void*) _containing_obj, | |
| 171 HR_FORMAT_PARAMS(from)); | |
| 342 | 172 _containing_obj->print_on(gclog_or_tty); |
| 3766 | 173 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " |
| 174 "in region "HR_FORMAT, | |
| 175 (void*) obj, | |
| 176 HR_FORMAT_PARAMS(to)); | |
| 342 | 177 obj->print_on(gclog_or_tty); |
| 178 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 179 cv_obj, cv_field); | |
| 180 gclog_or_tty->print_cr("----------"); | |
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181 gclog_or_tty->flush(); |
| 342 | 182 _failures = true; |
| 183 if (!failed) _n_failures++; | |
| 184 } | |
| 185 } | |
| 186 } | |
| 187 } | |
| 188 } | |
| 189 }; | |
| 190 | |
| 191 template<class ClosureType> | |
| 192 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
| 193 HeapRegion* hr, | |
| 194 HeapWord* cur, HeapWord* top) { | |
| 195 oop cur_oop = oop(cur); | |
| 196 int oop_size = cur_oop->size(); | |
| 197 HeapWord* next_obj = cur + oop_size; | |
| 198 while (next_obj < top) { | |
| 199 // Keep filtering the remembered set. | |
| 200 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
| 201 // Bottom lies entirely below top, so we can call the | |
| 202 // non-memRegion version of oop_iterate below. | |
| 203 cur_oop->oop_iterate(cl); | |
| 204 } | |
| 205 cur = next_obj; | |
| 206 cur_oop = oop(cur); | |
| 207 oop_size = cur_oop->size(); | |
| 208 next_obj = cur + oop_size; | |
| 209 } | |
| 210 return cur; | |
| 211 } | |
| 212 | |
| 213 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
| 214 HeapWord* bottom, | |
| 215 HeapWord* top, | |
| 216 OopClosure* cl) { | |
| 217 G1CollectedHeap* g1h = _g1; | |
| 218 int oop_size; | |
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219 OopClosure* cl2 = NULL; |
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220 |
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221 FilterIntoCSClosure intoCSFilt(this, g1h, cl); |
| 342 | 222 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); |
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223 |
| 342 | 224 switch (_fk) { |
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225 case NoFilterKind: cl2 = cl; break; |
| 342 | 226 case IntoCSFilterKind: cl2 = &intoCSFilt; break; |
| 227 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
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228 default: ShouldNotReachHere(); |
| 342 | 229 } |
| 230 | |
| 231 // Start filtering what we add to the remembered set. If the object is | |
| 232 // not considered dead, either because it is marked (in the mark bitmap) | |
| 233 // or it was allocated after marking finished, then we add it. Otherwise | |
| 234 // we can safely ignore the object. | |
| 235 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 236 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 237 } else { | |
| 238 oop_size = oop(bottom)->size(); | |
| 239 } | |
| 240 | |
| 241 bottom += oop_size; | |
| 242 | |
| 243 if (bottom < top) { | |
| 244 // We replicate the loop below for several kinds of possible filters. | |
| 245 switch (_fk) { | |
| 246 case NoFilterKind: | |
| 247 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
| 248 break; | |
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249 |
| 342 | 250 case IntoCSFilterKind: { |
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251 FilterIntoCSClosure filt(this, g1h, cl); |
| 342 | 252 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); |
| 253 break; | |
| 254 } | |
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255 |
| 342 | 256 case OutOfRegionFilterKind: { |
| 257 FilterOutOfRegionClosure filt(_hr, cl); | |
| 258 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 259 break; | |
| 260 } | |
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261 |
| 342 | 262 default: |
| 263 ShouldNotReachHere(); | |
| 264 } | |
| 265 | |
| 266 // Last object. Need to do dead-obj filtering here too. | |
| 267 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 268 oop(bottom)->oop_iterate(cl2, mr); | |
| 269 } | |
| 270 } | |
| 271 } | |
| 272 | |
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273 // Minimum region size; we won't go lower than that. |
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274 // We might want to decrease this in the future, to deal with small |
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275 // heaps a bit more efficiently. |
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276 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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277 |
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278 // Maximum region size; we don't go higher than that. There's a good |
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279 // reason for having an upper bound. We don't want regions to get too |
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280 // large, otherwise cleanup's effectiveness would decrease as there |
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281 // will be fewer opportunities to find totally empty regions after |
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282 // marking. |
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283 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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284 |
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285 // The automatic region size calculation will try to have around this |
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286 // many regions in the heap (based on the min heap size). |
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287 #define TARGET_REGION_NUMBER 2048 |
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288 |
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289 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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290 // region_size in bytes |
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291 uintx region_size = G1HeapRegionSize; |
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292 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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293 // We base the automatic calculation on the min heap size. This |
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294 // can be problematic if the spread between min and max is quite |
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295 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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296 // the max size, the region size might be way too large for the |
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297 // min size. Either way, some users might have to set the region |
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298 // size manually for some -Xms / -Xmx combos. |
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299 |
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300 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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301 (uintx) MIN_REGION_SIZE); |
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302 } |
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303 |
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304 int region_size_log = log2_long((jlong) region_size); |
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305 // Recalculate the region size to make sure it's a power of |
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306 // 2. This means that region_size is the largest power of 2 that's |
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307 // <= what we've calculated so far. |
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308 region_size = ((uintx)1 << region_size_log); |
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309 |
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310 // Now make sure that we don't go over or under our limits. |
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311 if (region_size < MIN_REGION_SIZE) { |
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312 region_size = MIN_REGION_SIZE; |
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313 } else if (region_size > MAX_REGION_SIZE) { |
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314 region_size = MAX_REGION_SIZE; |
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315 } |
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316 |
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317 // And recalculate the log. |
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318 region_size_log = log2_long((jlong) region_size); |
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319 |
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320 // Now, set up the globals. |
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321 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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322 LogOfHRGrainBytes = region_size_log; |
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323 |
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324 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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325 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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326 |
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327 guarantee(GrainBytes == 0, "we should only set it once"); |
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328 // The cast to int is safe, given that we've bounded region_size by |
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329 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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330 GrainBytes = (size_t)region_size; |
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331 |
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332 guarantee(GrainWords == 0, "we should only set it once"); |
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333 GrainWords = GrainBytes >> LogHeapWordSize; |
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334 guarantee((size_t) 1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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335 |
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336 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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337 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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338 } |
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339 |
| 342 | 340 void HeapRegion::reset_after_compaction() { |
| 341 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 342 // After a compaction the mark bitmap is invalid, so we must | |
| 343 // treat all objects as being inside the unmarked area. | |
| 344 zero_marked_bytes(); | |
| 345 init_top_at_mark_start(); | |
| 346 } | |
| 347 | |
| 348 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
| 2152 | 349 assert(_humongous_type == NotHumongous, |
| 350 "we should have already filtered out humongous regions"); | |
| 351 assert(_humongous_start_region == NULL, | |
| 352 "we should have already filtered out humongous regions"); | |
| 353 assert(_end == _orig_end, | |
| 354 "we should have already filtered out humongous regions"); | |
| 355 | |
| 342 | 356 _in_collection_set = false; |
| 357 | |
| 358 set_young_index_in_cset(-1); | |
| 359 uninstall_surv_rate_group(); | |
| 360 set_young_type(NotYoung); | |
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361 reset_pre_dummy_top(); |
| 342 | 362 |
| 363 if (!par) { | |
| 364 // If this is parallel, this will be done later. | |
| 365 HeapRegionRemSet* hrrs = rem_set(); | |
| 366 if (hrrs != NULL) hrrs->clear(); | |
| 355 | 367 _claimed = InitialClaimValue; |
| 342 | 368 } |
| 369 zero_marked_bytes(); | |
| 370 | |
| 371 _offsets.resize(HeapRegion::GrainWords); | |
| 372 init_top_at_mark_start(); | |
| 356 | 373 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 374 } |
| 375 | |
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376 void HeapRegion::par_clear() { |
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377 assert(used() == 0, "the region should have been already cleared"); |
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378 assert(capacity() == HeapRegion::GrainBytes, "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 void HeapRegion::calc_gc_efficiency() { |
| 6611 | 387 // GC efficiency is the ratio of how much space would be |
| 388 // reclaimed over how long we predict it would take to reclaim it. | |
| 342 | 389 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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390 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 6611 | 391 |
| 392 // Retrieve a prediction of the elapsed time for this region for | |
| 393 // a mixed gc because the region will only be evacuated during a | |
| 394 // mixed gc. | |
| 395 double region_elapsed_time_ms = | |
| 396 g1p->predict_region_elapsed_time_ms(this, false /* for_young_gc */); | |
| 397 _gc_efficiency = (double) reclaimable_bytes() / region_elapsed_time_ms; | |
| 342 | 398 } |
| 399 | |
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400 void HeapRegion::set_startsHumongous(HeapWord* new_top, HeapWord* new_end) { |
| 2152 | 401 assert(!isHumongous(), "sanity / pre-condition"); |
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402 assert(end() == _orig_end, |
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403 "Should be normal before the humongous object allocation"); |
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404 assert(top() == bottom(), "should be empty"); |
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405 assert(bottom() <= new_top && new_top <= new_end, "pre-condition"); |
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406 |
| 355 | 407 _humongous_type = StartsHumongous; |
| 342 | 408 _humongous_start_region = this; |
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409 |
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410 set_end(new_end); |
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411 _offsets.set_for_starts_humongous(new_top); |
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412 } |
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413 |
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414 void HeapRegion::set_continuesHumongous(HeapRegion* first_hr) { |
| 2152 | 415 assert(!isHumongous(), "sanity / pre-condition"); |
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416 assert(end() == _orig_end, |
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417 "Should be normal before the humongous object allocation"); |
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418 assert(top() == bottom(), "should be empty"); |
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419 assert(first_hr->startsHumongous(), "pre-condition"); |
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420 |
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421 _humongous_type = ContinuesHumongous; |
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422 _humongous_start_region = first_hr; |
| 342 | 423 } |
| 424 | |
| 2152 | 425 void HeapRegion::set_notHumongous() { |
| 426 assert(isHumongous(), "pre-condition"); | |
| 427 | |
| 428 if (startsHumongous()) { | |
| 429 assert(top() <= end(), "pre-condition"); | |
| 430 set_end(_orig_end); | |
| 431 if (top() > end()) { | |
| 432 // at least one "continues humongous" region after it | |
| 433 set_top(end()); | |
| 434 } | |
| 435 } else { | |
| 436 // continues humongous | |
| 437 assert(end() == _orig_end, "sanity"); | |
| 438 } | |
| 439 | |
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440 assert(capacity() == HeapRegion::GrainBytes, "pre-condition"); |
| 2152 | 441 _humongous_type = NotHumongous; |
| 442 _humongous_start_region = NULL; | |
| 443 } | |
| 444 | |
| 342 | 445 bool HeapRegion::claimHeapRegion(jint claimValue) { |
| 446 jint current = _claimed; | |
| 447 if (current != claimValue) { | |
| 448 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 449 if (res == current) { | |
| 450 return true; | |
| 451 } | |
| 452 } | |
| 453 return false; | |
| 454 } | |
| 455 | |
| 456 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
| 457 HeapWord* low = addr; | |
| 458 HeapWord* high = end(); | |
| 459 while (low < high) { | |
| 460 size_t diff = pointer_delta(high, low); | |
| 461 // Must add one below to bias toward the high amount. Otherwise, if | |
| 462 // "high" were at the desired value, and "low" were one less, we | |
| 463 // would not converge on "high". This is not symmetric, because | |
| 464 // we set "high" to a block start, which might be the right one, | |
| 465 // which we don't do for "low". | |
| 466 HeapWord* middle = low + (diff+1)/2; | |
| 467 if (middle == high) return high; | |
| 468 HeapWord* mid_bs = block_start_careful(middle); | |
| 469 if (mid_bs < addr) { | |
| 470 low = middle; | |
| 471 } else { | |
| 472 high = mid_bs; | |
| 473 } | |
| 474 } | |
| 475 assert(low == high && low >= addr, "Didn't work."); | |
| 476 return low; | |
| 477 } | |
| 478 | |
| 356 | 479 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 480 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
| 342 | 481 hr_clear(false/*par*/, clear_space); |
| 482 } | |
| 483 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 484 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 485 #endif // _MSC_VER | |
| 486 | |
| 487 | |
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488 HeapRegion::HeapRegion(uint hrs_index, |
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489 G1BlockOffsetSharedArray* sharedOffsetArray, |
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490 MemRegion mr, bool is_zeroed) : |
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491 G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), |
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492 _hrs_index(hrs_index), |
| 355 | 493 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
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494 _in_collection_set(false), |
| 342 | 495 _next_in_special_set(NULL), _orig_end(NULL), |
| 355 | 496 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 6011 | 497 _prev_marked_bytes(0), _next_marked_bytes(0), _gc_efficiency(0.0), |
| 342 | 498 _young_type(NotYoung), _next_young_region(NULL), |
| 2152 | 499 _next_dirty_cards_region(NULL), _next(NULL), _pending_removal(false), |
| 500 #ifdef ASSERT | |
| 501 _containing_set(NULL), | |
| 502 #endif // ASSERT | |
| 503 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
| 504 _rem_set(NULL), _recorded_rs_length(0), _predicted_elapsed_time_ms(0), | |
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505 _predicted_bytes_to_copy(0) |
| 342 | 506 { |
| 507 _orig_end = mr.end(); | |
| 508 // Note that initialize() will set the start of the unmarked area of the | |
| 509 // region. | |
| 356 | 510 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 511 set_top(bottom()); | |
| 512 set_saved_mark(); | |
| 342 | 513 |
| 514 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
| 515 | |
| 516 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
| 517 } | |
| 518 | |
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519 CompactibleSpace* HeapRegion::next_compaction_space() const { |
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520 // We're not using an iterator given that it will wrap around when |
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521 // it reaches the last region and this is not what we want here. |
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522 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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523 uint index = hrs_index() + 1; |
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524 while (index < g1h->n_regions()) { |
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525 HeapRegion* hr = g1h->region_at(index); |
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526 if (!hr->isHumongous()) { |
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527 return hr; |
| 342 | 528 } |
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529 index += 1; |
| 342 | 530 } |
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531 return NULL; |
| 342 | 532 } |
| 533 | |
| 534 void HeapRegion::save_marks() { | |
| 535 set_saved_mark(); | |
| 536 } | |
| 537 | |
| 538 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
| 539 HeapWord* p = mr.start(); | |
| 540 HeapWord* e = mr.end(); | |
| 541 oop obj; | |
| 542 while (p < e) { | |
| 543 obj = oop(p); | |
| 544 p += obj->oop_iterate(cl); | |
| 545 } | |
| 546 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
| 547 } | |
| 548 | |
| 549 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 550 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
| 551 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 552 } | |
| 553 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 554 | |
| 555 | |
| 556 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
| 557 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
| 558 } | |
| 559 | |
|
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560 void HeapRegion::note_self_forwarding_removal_start(bool during_initial_mark, |
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561 bool during_conc_mark) { |
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562 // We always recreate the prev marking info and we'll explicitly |
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563 // mark all objects we find to be self-forwarded on the prev |
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564 // bitmap. So all objects need to be below PTAMS. |
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565 _prev_top_at_mark_start = top(); |
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566 _prev_marked_bytes = 0; |
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567 |
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568 if (during_initial_mark) { |
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569 // During initial-mark, we'll also explicitly mark all objects |
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570 // we find to be self-forwarded on the next bitmap. So all |
|
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571 // objects need to be below NTAMS. |
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572 _next_top_at_mark_start = top(); |
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573 _next_marked_bytes = 0; |
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574 } else if (during_conc_mark) { |
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575 // During concurrent mark, all objects in the CSet (including |
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576 // the ones we find to be self-forwarded) are implicitly live. |
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577 // So all objects need to be above NTAMS. |
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578 _next_top_at_mark_start = bottom(); |
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579 _next_marked_bytes = 0; |
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580 } |
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581 } |
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582 |
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583 void HeapRegion::note_self_forwarding_removal_end(bool during_initial_mark, |
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584 bool during_conc_mark, |
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585 size_t marked_bytes) { |
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586 assert(0 <= marked_bytes && marked_bytes <= used(), |
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587 err_msg("marked: "SIZE_FORMAT" used: "SIZE_FORMAT, |
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588 marked_bytes, used())); |
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589 _prev_marked_bytes = marked_bytes; |
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590 } |
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591 |
| 342 | 592 HeapWord* |
| 593 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 594 ObjectClosure* cl) { | |
| 595 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 596 // We used to use "block_start_careful" here. But we're actually happy | |
| 597 // to update the BOT while we do this... | |
| 598 HeapWord* cur = block_start(mr.start()); | |
| 599 mr = mr.intersection(used_region()); | |
| 600 if (mr.is_empty()) return NULL; | |
| 601 // Otherwise, find the obj that extends onto mr.start(). | |
| 602 | |
| 603 assert(cur <= mr.start() | |
|
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604 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 605 cur + oop(cur)->size() > mr.start()), |
| 606 "postcondition of block_start"); | |
| 607 oop obj; | |
| 608 while (cur < mr.end()) { | |
| 609 obj = oop(cur); | |
|
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610 if (obj->klass_or_null() == NULL) { |
| 342 | 611 // Ran into an unparseable point. |
| 612 return cur; | |
| 613 } else if (!g1h->is_obj_dead(obj)) { | |
| 614 cl->do_object(obj); | |
| 615 } | |
| 616 if (cl->abort()) return cur; | |
| 617 // The check above must occur before the operation below, since an | |
| 618 // abort might invalidate the "size" operation. | |
| 619 cur += obj->size(); | |
| 620 } | |
| 621 return NULL; | |
| 622 } | |
| 623 | |
| 624 HeapWord* | |
| 625 HeapRegion:: | |
| 626 oops_on_card_seq_iterate_careful(MemRegion mr, | |
|
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627 FilterOutOfRegionClosure* cl, |
|
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628 bool filter_young, |
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629 jbyte* card_ptr) { |
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630 // Currently, we should only have to clean the card if filter_young |
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631 // is true and vice versa. |
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632 if (filter_young) { |
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633 assert(card_ptr != NULL, "pre-condition"); |
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634 } else { |
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635 assert(card_ptr == NULL, "pre-condition"); |
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636 } |
| 342 | 637 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 638 | |
| 639 // If we're within a stop-world GC, then we might look at a card in a | |
| 640 // GC alloc region that extends onto a GC LAB, which may not be | |
| 641 // parseable. Stop such at the "saved_mark" of the region. | |
| 4839 | 642 if (g1h->is_gc_active()) { |
| 342 | 643 mr = mr.intersection(used_region_at_save_marks()); |
| 644 } else { | |
| 645 mr = mr.intersection(used_region()); | |
| 646 } | |
| 647 if (mr.is_empty()) return NULL; | |
| 648 // Otherwise, find the obj that extends onto mr.start(). | |
| 649 | |
|
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650 // The intersection of the incoming mr (for the card) and the |
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651 // allocated part of the region is non-empty. This implies that |
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652 // we have actually allocated into this region. The code in |
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653 // G1CollectedHeap.cpp that allocates a new region sets the |
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654 // is_young tag on the region before allocating. Thus we |
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655 // safely know if this region is young. |
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656 if (is_young() && filter_young) { |
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657 return NULL; |
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658 } |
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659 |
| 1705 | 660 assert(!is_young(), "check value of filter_young"); |
| 661 | |
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662 // We can only clean the card here, after we make the decision that |
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663 // the card is not young. And we only clean the card if we have been |
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664 // asked to (i.e., card_ptr != NULL). |
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665 if (card_ptr != NULL) { |
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666 *card_ptr = CardTableModRefBS::clean_card_val(); |
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667 // We must complete this write before we do any of the reads below. |
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668 OrderAccess::storeload(); |
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669 } |
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670 |
| 4839 | 671 // Cache the boundaries of the memory region in some const locals |
| 672 HeapWord* const start = mr.start(); | |
| 673 HeapWord* const end = mr.end(); | |
| 674 | |
| 342 | 675 // We used to use "block_start_careful" here. But we're actually happy |
| 676 // to update the BOT while we do this... | |
| 4839 | 677 HeapWord* cur = block_start(start); |
| 678 assert(cur <= start, "Postcondition"); | |
| 679 | |
| 680 oop obj; | |
| 342 | 681 |
| 4839 | 682 HeapWord* next = cur; |
| 683 while (next <= start) { | |
| 684 cur = next; | |
| 685 obj = oop(cur); | |
| 686 if (obj->klass_or_null() == NULL) { | |
| 342 | 687 // Ran into an unparseable point. |
| 688 return cur; | |
| 689 } | |
| 690 // Otherwise... | |
| 4839 | 691 next = (cur + obj->size()); |
| 342 | 692 } |
| 4839 | 693 |
| 694 // If we finish the above loop...We have a parseable object that | |
| 695 // begins on or before the start of the memory region, and ends | |
| 696 // inside or spans the entire region. | |
| 697 | |
| 698 assert(obj == oop(cur), "sanity"); | |
| 699 assert(cur <= start && | |
| 700 obj->klass_or_null() != NULL && | |
| 701 (cur + obj->size()) > start, | |
| 342 | 702 "Loop postcondition"); |
| 4839 | 703 |
| 342 | 704 if (!g1h->is_obj_dead(obj)) { |
| 705 obj->oop_iterate(cl, mr); | |
| 706 } | |
| 707 | |
| 4839 | 708 while (cur < end) { |
| 342 | 709 obj = oop(cur); |
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710 if (obj->klass_or_null() == NULL) { |
| 342 | 711 // Ran into an unparseable point. |
| 712 return cur; | |
| 713 }; | |
| 4839 | 714 |
| 342 | 715 // Otherwise: |
| 716 next = (cur + obj->size()); | |
| 4839 | 717 |
| 342 | 718 if (!g1h->is_obj_dead(obj)) { |
| 4839 | 719 if (next < end || !obj->is_objArray()) { |
| 720 // This object either does not span the MemRegion | |
| 721 // boundary, or if it does it's not an array. | |
| 722 // Apply closure to whole object. | |
| 342 | 723 obj->oop_iterate(cl); |
| 724 } else { | |
| 4839 | 725 // This obj is an array that spans the boundary. |
| 726 // Stop at the boundary. | |
| 727 obj->oop_iterate(cl, mr); | |
| 342 | 728 } |
| 729 } | |
| 730 cur = next; | |
| 731 } | |
| 732 return NULL; | |
| 733 } | |
| 734 | |
| 735 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
| 736 void HeapRegion::print_on(outputStream* st) const { | |
| 737 if (isHumongous()) { | |
| 738 if (startsHumongous()) | |
| 739 st->print(" HS"); | |
| 740 else | |
| 741 st->print(" HC"); | |
| 742 } else { | |
| 743 st->print(" "); | |
| 744 } | |
| 745 if (in_collection_set()) | |
| 746 st->print(" CS"); | |
| 747 else | |
| 748 st->print(" "); | |
| 749 if (is_young()) | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1388
diff
changeset
|
750 st->print(is_survivor() ? " SU" : " Y "); |
| 342 | 751 else |
| 752 st->print(" "); | |
| 753 if (is_empty()) | |
| 754 st->print(" F"); | |
| 755 else | |
| 756 st->print(" "); | |
|
4073
53074c2c4600
7099849: G1: include heap region information in hs_err files
tonyp
parents:
4023
diff
changeset
|
757 st->print(" TS %5d", _gc_time_stamp); |
| 1388 | 758 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 759 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 760 G1OffsetTableContigSpace::print_on(st); |
| 761 } | |
| 762 | |
| 6008 | 763 void HeapRegion::verify() const { |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
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parents:
942
diff
changeset
|
764 bool dummy = false; |
| 6008 | 765 verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); |
| 811 | 766 } |
| 767 | |
| 342 | 768 // This really ought to be commoned up into OffsetTableContigSpace somehow. |
| 769 // We would need a mechanism to make that code skip dead objects. | |
| 770 | |
| 6008 | 771 void HeapRegion::verify(VerifyOption vo, |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
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942
diff
changeset
|
772 bool* failures) const { |
| 342 | 773 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
1020
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6882730: G1: parallel heap verification messes up region dump
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942
diff
changeset
|
774 *failures = false; |
| 342 | 775 HeapWord* p = bottom(); |
| 776 HeapWord* prev_p = NULL; | |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
777 VerifyLiveClosure vl_cl(g1, vo); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
778 bool is_humongous = isHumongous(); |
|
2133
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
779 bool do_bot_verify = !is_young(); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
780 size_t object_num = 0; |
| 342 | 781 while (p < top()) { |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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1972
diff
changeset
|
782 oop obj = oop(p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
783 size_t obj_size = obj->size(); |
|
2250ee17e258
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parents:
1972
diff
changeset
|
784 object_num += 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
785 |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
786 if (is_humongous != g1->isHumongous(obj_size)) { |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
787 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
|
788 SIZE_FORMAT" words) in a %shumongous region", |
|
2133
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tonyp
parents:
1972
diff
changeset
|
789 p, g1->isHumongous(obj_size) ? "" : "non-", |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
790 obj_size, is_humongous ? "" : "non-"); |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
791 *failures = true; |
|
2133
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7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
792 return; |
|
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 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
795 // 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
|
796 // appropriate messasge. |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
797 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
|
798 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
799 return; |
|
1718
bb847e31b836
6974928: G1: sometimes humongous objects are allocated in young regions
tonyp
parents:
1705
diff
changeset
|
800 } |
|
2133
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tonyp
parents:
1972
diff
changeset
|
801 |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
802 if (!g1->is_obj_dead_cond(obj, this, vo)) { |
|
2133
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parents:
1972
diff
changeset
|
803 if (obj->is_oop()) { |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
804 klassOop klass = obj->klass(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
805 if (!klass->is_perm()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
806 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
|
807 "not in perm", klass, obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
808 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
809 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
810 } else if (!klass->is_klass()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
811 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
|
812 "not a klass", klass, obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
813 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
814 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
815 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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parents:
1972
diff
changeset
|
816 vl_cl.set_containing_obj(obj); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
817 obj->oop_iterate(&vl_cl); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
818 if (vl_cl.failures()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
819 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
820 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
821 if (G1MaxVerifyFailures >= 0 && |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
822 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
823 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
824 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
825 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
826 } else { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
827 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
|
828 *failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
829 return; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
830 } |
| 342 | 831 } |
| 832 prev_p = p; | |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
833 p += obj_size; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
834 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
835 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
836 if (p != top()) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
837 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
|
838 "does not match top "PTR_FORMAT, p, top()); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
839 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
840 return; |
| 342 | 841 } |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
842 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
843 HeapWord* the_end = end(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
844 assert(p == top(), "it should still hold"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
845 // 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
|
846 // 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
|
847 // 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
|
848 if (p < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
849 // Look up top |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
850 HeapWord* addr_1 = p; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
851 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
|
852 if (b_start_1 != p) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
853 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
|
854 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
855 addr_1, b_start_1, p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
856 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
857 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
858 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
859 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
860 // Look up top + 1 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
861 HeapWord* addr_2 = p + 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
862 if (addr_2 < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
863 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
|
864 if (b_start_2 != p) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
865 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
|
866 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
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tonyp
parents:
1972
diff
changeset
|
867 addr_2, b_start_2, p); |
|
1020
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
868 *failures = true; |
|
ff2402f6a50b
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
942
diff
changeset
|
869 return; |
|
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
870 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
871 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
872 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
873 // Look up an address between top and end |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
874 size_t diff = pointer_delta(the_end, p) / 2; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
875 HeapWord* addr_3 = p + diff; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
876 if (addr_3 < the_end) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
877 HeapWord* b_start_3 = _offsets.block_start_const(addr_3); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
878 if (b_start_3 != p) { |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
879 gclog_or_tty->print_cr("BOT look up for top + diff: "PTR_FORMAT" " |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
880 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
881 addr_3, b_start_3, p); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
882 *failures = true; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
883 return; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
884 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
885 } |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
886 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
887 // Loook up end - 1 |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
888 HeapWord* addr_4 = the_end - 1; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
1972
diff
changeset
|
889 HeapWord* b_start_4 = _offsets.block_start_const(addr_4); |
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890 if (b_start_4 != p) { |
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891 gclog_or_tty->print_cr("BOT look up for end - 1: "PTR_FORMAT" " |
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892 " yielded "PTR_FORMAT", expecting "PTR_FORMAT, |
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893 addr_4, b_start_4, p); |
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894 *failures = true; |
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895 return; |
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896 } |
| 342 | 897 } |
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898 |
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899 if (is_humongous && object_num > 1) { |
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900 gclog_or_tty->print_cr("region ["PTR_FORMAT","PTR_FORMAT"] is humongous " |
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901 "but has "SIZE_FORMAT", objects", |
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902 bottom(), end(), object_num); |
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903 *failures = true; |
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904 return; |
| 342 | 905 } |
| 906 } | |
| 907 | |
| 908 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
| 909 // away eventually. | |
| 910 | |
| 356 | 911 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 342 | 912 // false ==> we'll do the clearing if there's clearing to be done. |
| 356 | 913 ContiguousSpace::initialize(mr, false, mangle_space); |
| 342 | 914 _offsets.zero_bottom_entry(); |
| 915 _offsets.initialize_threshold(); | |
| 356 | 916 if (clear_space) clear(mangle_space); |
| 342 | 917 } |
| 918 | |
| 356 | 919 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
| 920 ContiguousSpace::clear(mangle_space); | |
| 342 | 921 _offsets.zero_bottom_entry(); |
| 922 _offsets.initialize_threshold(); | |
| 923 } | |
| 924 | |
| 925 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 926 Space::set_bottom(new_bottom); | |
| 927 _offsets.set_bottom(new_bottom); | |
| 928 } | |
| 929 | |
| 930 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 931 Space::set_end(new_end); | |
| 932 _offsets.resize(new_end - bottom()); | |
| 933 } | |
| 934 | |
| 935 void G1OffsetTableContigSpace::print() const { | |
| 936 print_short(); | |
| 937 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 938 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 939 bottom(), top(), _offsets.threshold(), end()); | |
| 940 } | |
| 941 | |
| 942 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 943 return _offsets.initialize_threshold(); | |
| 944 } | |
| 945 | |
| 946 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 947 HeapWord* end) { | |
| 948 _offsets.alloc_block(start, end); | |
| 949 return _offsets.threshold(); | |
| 950 } | |
| 951 | |
| 952 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 953 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 954 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
| 955 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
| 956 return top(); | |
| 957 else | |
| 958 return ContiguousSpace::saved_mark_word(); | |
| 959 } | |
| 960 | |
| 961 void G1OffsetTableContigSpace::set_saved_mark() { | |
| 962 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 963 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 964 | |
| 965 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 966 // The order of these is important, as another thread might be | |
| 967 // about to start scanning this region. If it does so after | |
| 968 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 969 // will be false, and it will pick up top() as the high water mark | |
| 970 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 971 // will pick up the right saved_mark_word() as the high water mark | |
| 972 // of the region. Either way, the behaviour will be correct. | |
| 973 ContiguousSpace::set_saved_mark(); | |
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974 OrderAccess::storestore(); |
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975 _gc_time_stamp = curr_gc_time_stamp; |
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976 // No need to do another barrier to flush the writes above. If |
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977 // this is called in parallel with other threads trying to |
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978 // allocate into the region, the caller should call this while |
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979 // holding a lock and when the lock is released the writes will be |
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980 // flushed. |
| 342 | 981 } |
| 982 } | |
| 983 | |
| 984 G1OffsetTableContigSpace:: | |
| 985 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 986 MemRegion mr, bool is_zeroed) : | |
| 987 _offsets(sharedOffsetArray, mr), | |
| 988 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 989 _gc_time_stamp(0) | |
| 990 { | |
| 991 _offsets.set_space(this); | |
| 356 | 992 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 342 | 993 } |