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annotate src/share/vm/gc_implementation/g1/g1EvacFailure.hpp @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 89152779163c 6948da6d7c13
children
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1 /*
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP
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27
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28 #include "gc_implementation/g1/concurrentMark.inline.hpp"
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29 #include "gc_implementation/g1/dirtyCardQueue.hpp"
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30 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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31 #include "gc_implementation/g1/g1_globals.hpp"
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32 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
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33 #include "gc_implementation/g1/heapRegion.hpp"
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34 #include "gc_implementation/g1/heapRegionRemSet.hpp"
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35 #include "utilities/workgroup.hpp"
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36
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37 // Closures and tasks associated with any self-forwarding pointers
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38 // installed as a result of an evacuation failure.
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39
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40 class UpdateRSetDeferred : public OopsInHeapRegionClosure {
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41 private:
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42 G1CollectedHeap* _g1;
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43 DirtyCardQueue *_dcq;
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44 G1SATBCardTableModRefBS* _ct_bs;
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45
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46 public:
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47 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) :
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48 _g1(g1), _ct_bs(_g1->g1_barrier_set()), _dcq(dcq) {}
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49
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50 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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51 virtual void do_oop( oop* p) { do_oop_work(p); }
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52 template <class T> void do_oop_work(T* p) {
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53 assert(_from->is_in_reserved(p), "paranoia");
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54 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) &&
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55 !_from->is_survivor()) {
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56 size_t card_index = _ct_bs->index_for(p);
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57 if (_ct_bs->mark_card_deferred(card_index)) {
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58 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index));
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59 }
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60 }
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61 }
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62 };
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63
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64 class RemoveSelfForwardPtrObjClosure: public ObjectClosure {
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65 private:
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66 G1CollectedHeap* _g1;
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67 ConcurrentMark* _cm;
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68 HeapRegion* _hr;
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69 size_t _marked_bytes;
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70 OopsInHeapRegionClosure *_update_rset_cl;
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71 bool _during_initial_mark;
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72 bool _during_conc_mark;
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73 uint _worker_id;
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74 HeapWord* _end_of_last_gap;
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75 HeapWord* _last_gap_threshold;
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76 HeapWord* _last_obj_threshold;
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77
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78 public:
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79 RemoveSelfForwardPtrObjClosure(G1CollectedHeap* g1, ConcurrentMark* cm,
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80 HeapRegion* hr,
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81 OopsInHeapRegionClosure* update_rset_cl,
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82 bool during_initial_mark,
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83 bool during_conc_mark,
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84 uint worker_id) :
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85 _g1(g1), _cm(cm), _hr(hr), _marked_bytes(0),
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86 _update_rset_cl(update_rset_cl),
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87 _during_initial_mark(during_initial_mark),
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88 _during_conc_mark(during_conc_mark),
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89 _worker_id(worker_id),
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90 _end_of_last_gap(hr->bottom()),
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91 _last_gap_threshold(hr->bottom()),
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92 _last_obj_threshold(hr->bottom()) { }
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93
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94 size_t marked_bytes() { return _marked_bytes; }
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95
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96 // <original comment>
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97 // The original idea here was to coalesce evacuated and dead objects.
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98 // However that caused complications with the block offset table (BOT).
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99 // In particular if there were two TLABs, one of them partially refined.
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100 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~|
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101 // The BOT entries of the unrefined part of TLAB_2 point to the start
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102 // of TLAB_2. If the last object of the TLAB_1 and the first object
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103 // of TLAB_2 are coalesced, then the cards of the unrefined part
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104 // would point into middle of the filler object.
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105 // The current approach is to not coalesce and leave the BOT contents intact.
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106 // </original comment>
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107 //
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108 // We now reset the BOT when we start the object iteration over the
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109 // region and refine its entries for every object we come across. So
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110 // the above comment is not really relevant and we should be able
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111 // to coalesce dead objects if we want to.
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112 void do_object(oop obj) {
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113 HeapWord* obj_addr = (HeapWord*) obj;
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114 assert(_hr->is_in(obj_addr), "sanity");
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115 size_t obj_size = obj->size();
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116 HeapWord* obj_end = obj_addr + obj_size;
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117
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118 if (_end_of_last_gap != obj_addr) {
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119 // there was a gap before obj_addr
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120 _last_gap_threshold = _hr->cross_threshold(_end_of_last_gap, obj_addr);
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121 }
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122
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123 if (obj->is_forwarded() && obj->forwardee() == obj) {
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124 // The object failed to move.
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125
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126 // We consider all objects that we find self-forwarded to be
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127 // live. What we'll do is that we'll update the prev marking
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128 // info so that they are all under PTAMS and explicitly marked.
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129 if (!_cm->isPrevMarked(obj)) {
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130 _cm->markPrev(obj);
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131 }
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132 if (_during_initial_mark) {
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133 // For the next marking info we'll only mark the
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134 // self-forwarded objects explicitly if we are during
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135 // initial-mark (since, normally, we only mark objects pointed
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136 // to by roots if we succeed in copying them). By marking all
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137 // self-forwarded objects we ensure that we mark any that are
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138 // still pointed to be roots. During concurrent marking, and
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139 // after initial-mark, we don't need to mark any objects
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140 // explicitly and all objects in the CSet are considered
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141 // (implicitly) live. So, we won't mark them explicitly and
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142 // we'll leave them over NTAMS.
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143 _cm->grayRoot(obj, obj_size, _worker_id, _hr);
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144 }
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145 _marked_bytes += (obj_size * HeapWordSize);
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146 obj->set_mark(markOopDesc::prototype());
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147
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148 // While we were processing RSet buffers during the collection,
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149 // we actually didn't scan any cards on the collection set,
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150 // since we didn't want to update remembered sets with entries
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151 // that point into the collection set, given that live objects
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152 // from the collection set are about to move and such entries
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153 // will be stale very soon.
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154 // This change also dealt with a reliability issue which
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155 // involved scanning a card in the collection set and coming
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156 // across an array that was being chunked and looking malformed.
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157 // The problem is that, if evacuation fails, we might have
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158 // remembered set entries missing given that we skipped cards on
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159 // the collection set. So, we'll recreate such entries now.
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160 obj->oop_iterate(_update_rset_cl);
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161 } else {
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162
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163 // The object has been either evacuated or is dead. Fill it with a
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164 // dummy object.
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165 MemRegion mr(obj_addr, obj_size);
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166 CollectedHeap::fill_with_object(mr);
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167
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168 // must nuke all dead objects which we skipped when iterating over the region
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169 _cm->clearRangePrevBitmap(MemRegion(_end_of_last_gap, obj_end));
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170 }
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171 _end_of_last_gap = obj_end;
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172 _last_obj_threshold = _hr->cross_threshold(obj_addr, obj_end);
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173 }
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174 };
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175
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176 class RemoveSelfForwardPtrHRClosure: public HeapRegionClosure {
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177 G1CollectedHeap* _g1h;
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178 ConcurrentMark* _cm;
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179 uint _worker_id;
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180
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181 DirtyCardQueue _dcq;
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182 UpdateRSetDeferred _update_rset_cl;
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183
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184 public:
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185 RemoveSelfForwardPtrHRClosure(G1CollectedHeap* g1h,
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186 uint worker_id) :
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187 _g1h(g1h), _dcq(&g1h->dirty_card_queue_set()), _update_rset_cl(g1h, &_dcq),
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188 _worker_id(worker_id), _cm(_g1h->concurrent_mark()) {
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189 }
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190
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191 bool doHeapRegion(HeapRegion *hr) {
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192 bool during_initial_mark = _g1h->g1_policy()->during_initial_mark_pause();
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193 bool during_conc_mark = _g1h->mark_in_progress();
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194
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195 assert(!hr->isHumongous(), "sanity");
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196 assert(hr->in_collection_set(), "bad CS");
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197
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198 if (hr->claimHeapRegion(HeapRegion::ParEvacFailureClaimValue)) {
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199 if (hr->evacuation_failed()) {
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200 RemoveSelfForwardPtrObjClosure rspc(_g1h, _cm, hr, &_update_rset_cl,
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201 during_initial_mark,
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202 during_conc_mark,
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203 _worker_id);
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204
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205 hr->note_self_forwarding_removal_start(during_initial_mark,
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206 during_conc_mark);
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207 _g1h->check_bitmaps("Self-Forwarding Ptr Removal", hr);
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208
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209 // In the common case (i.e. when there is no evacuation
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210 // failure) we make sure that the following is done when
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211 // the region is freed so that it is "ready-to-go" when it's
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212 // re-allocated. However, when evacuation failure happens, a
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213 // region will remain in the heap and might ultimately be added
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214 // to a CSet in the future. So we have to be careful here and
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215 // make sure the region's RSet is ready for parallel iteration
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216 // whenever this might be required in the future.
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217 hr->rem_set()->reset_for_par_iteration();
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218 hr->reset_bot();
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219 _update_rset_cl.set_region(hr);
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220 hr->object_iterate(&rspc);
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221
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222 hr->rem_set()->clean_strong_code_roots(hr);
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223
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224 hr->note_self_forwarding_removal_end(during_initial_mark,
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225 during_conc_mark,
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226 rspc.marked_bytes());
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227 }
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228 }
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229 return false;
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230 }
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231 };
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232
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233 class G1ParRemoveSelfForwardPtrsTask: public AbstractGangTask {
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234 protected:
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235 G1CollectedHeap* _g1h;
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236
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237 public:
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238 G1ParRemoveSelfForwardPtrsTask(G1CollectedHeap* g1h) :
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239 AbstractGangTask("G1 Remove Self-forwarding Pointers"),
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240 _g1h(g1h) { }
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241
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242 void work(uint worker_id) {
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243 RemoveSelfForwardPtrHRClosure rsfp_cl(_g1h, worker_id);
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244
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245 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id);
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246 _g1h->collection_set_iterate_from(hr, &rsfp_cl);
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247 }
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248 };
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249
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250 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP