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annotate src/share/vm/gc_implementation/g1/g1EvacFailure.hpp @ 4784:02838862dec8

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7121623: G1: always be able to reliably calculate the length of a forwarded chunked array Summary: Store the "next chunk start index" in the length field of the to-space object, instead of the from-space object, so that we can always reliably read the size of all from-space objects. Reviewed-by: johnc, ysr, jmasa
author tonyp
date Sat, 07 Jan 2012 00:43:59 -0500
parents 023652e49ac0
children 2ace1c4ee8da
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4783
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1 /*
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2 * Copyright (c) 2012, 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 CardTableModRefBS* _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((CardTableModRefBS*)_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 _prev_marked_bytes;
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70 size_t _next_marked_bytes;
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71 OopsInHeapRegionClosure *_update_rset_cl;
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72 public:
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73 RemoveSelfForwardPtrObjClosure(G1CollectedHeap* g1, ConcurrentMark* cm,
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74 HeapRegion* hr,
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75 OopsInHeapRegionClosure* update_rset_cl) :
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76 _g1(g1), _cm(cm), _hr(hr),
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77 _update_rset_cl(update_rset_cl),
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78 _prev_marked_bytes(0), _next_marked_bytes(0) {}
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79
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80 size_t prev_marked_bytes() { return _prev_marked_bytes; }
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81 size_t next_marked_bytes() { return _next_marked_bytes; }
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82
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83 // <original comment>
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84 // The original idea here was to coalesce evacuated and dead objects.
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85 // However that caused complications with the block offset table (BOT).
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86 // In particular if there were two TLABs, one of them partially refined.
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87 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~|
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88 // The BOT entries of the unrefined part of TLAB_2 point to the start
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89 // of TLAB_2. If the last object of the TLAB_1 and the first object
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90 // of TLAB_2 are coalesced, then the cards of the unrefined part
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91 // would point into middle of the filler object.
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92 // The current approach is to not coalesce and leave the BOT contents intact.
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93 // </original comment>
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94 //
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95 // We now reset the BOT when we start the object iteration over the
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96 // region and refine its entries for every object we come across. So
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97 // the above comment is not really relevant and we should be able
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98 // to coalesce dead objects if we want to.
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99 void do_object(oop obj) {
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100 HeapWord* obj_addr = (HeapWord*) obj;
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101 assert(_hr->is_in(obj_addr), "sanity");
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102 size_t obj_size = obj->size();
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103
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104 _hr->update_bot_for_object(obj_addr, obj_size);
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105
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106 if (obj->is_forwarded() && obj->forwardee() == obj) {
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107 // The object failed to move.
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108 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs.");
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109 _cm->markPrev(obj);
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110 assert(_cm->isPrevMarked(obj), "Should be marked!");
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111 _prev_marked_bytes += (obj_size * HeapWordSize);
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112 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) {
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113 _cm->markAndGrayObjectIfNecessary(obj);
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114 }
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115 obj->set_mark(markOopDesc::prototype());
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116
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117 // While we were processing RSet buffers during the collection,
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118 // we actually didn't scan any cards on the collection set,
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119 // since we didn't want to update remembered sets with entries
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120 // that point into the collection set, given that live objects
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121 // from the collection set are about to move and such entries
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122 // will be stale very soon.
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123 // This change also dealt with a reliability issue which
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124 // involved scanning a card in the collection set and coming
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125 // across an array that was being chunked and looking malformed.
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126 // The problem is that, if evacuation fails, we might have
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127 // remembered set entries missing given that we skipped cards on
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128 // the collection set. So, we'll recreate such entries now.
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129
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130 obj->oop_iterate(_update_rset_cl);
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131 assert(_cm->isPrevMarked(obj), "Should be marked!");
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132 } else {
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133 // The object has been either evacuated or is dead. Fill it with a
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134 // dummy object.
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135 MemRegion mr((HeapWord*)obj, obj_size);
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136 CollectedHeap::fill_with_object(mr);
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137 _cm->clearRangeBothMaps(mr);
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138 }
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139 }
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140 };
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141
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142 class RemoveSelfForwardPtrHRClosure: public HeapRegionClosure {
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143 G1CollectedHeap* _g1h;
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144 ConcurrentMark* _cm;
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145 OopsInHeapRegionClosure *_update_rset_cl;
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146
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147 public:
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148 RemoveSelfForwardPtrHRClosure(G1CollectedHeap* g1h,
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149 OopsInHeapRegionClosure* update_rset_cl) :
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150 _g1h(g1h), _update_rset_cl(update_rset_cl),
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151 _cm(_g1h->concurrent_mark()) { }
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152
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153 bool doHeapRegion(HeapRegion *hr) {
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154 assert(!hr->isHumongous(), "sanity");
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155 assert(hr->in_collection_set(), "bad CS");
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156
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157 if (hr->claimHeapRegion(HeapRegion::ParEvacFailureClaimValue)) {
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158 if (hr->evacuation_failed()) {
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159 RemoveSelfForwardPtrObjClosure rspc(_g1h, _cm, hr, _update_rset_cl);
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160
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161 // In the common case (i.e. when there is no evacuation
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162 // failure) we make sure that the following is done when
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163 // the region is freed so that it is "ready-to-go" when it's
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164 // re-allocated. However, when evacuation failure happens, a
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165 // region will remain in the heap and might ultimately be added
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166 // to a CSet in the future. So we have to be careful here and
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167 // make sure the region's RSet is ready for parallel iteration
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168 // whenever this might be required in the future.
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169 hr->rem_set()->reset_for_par_iteration();
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170 hr->reset_bot();
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171 _update_rset_cl->set_region(hr);
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172 hr->object_iterate(&rspc);
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173
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174 // A number of manipulations to make the TAMS for this region
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175 // be the current top, and the marked bytes be the ones observed
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176 // in the iteration.
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177 if (_cm->at_least_one_mark_complete()) {
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178 // The comments below are the postconditions achieved by the
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179 // calls. Note especially the last such condition, which says that
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180 // the count of marked bytes has been properly restored.
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181 hr->note_start_of_marking(false);
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182 // _next_top_at_mark_start == top, _next_marked_bytes == 0
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183 hr->add_to_marked_bytes(rspc.prev_marked_bytes());
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184 // _next_marked_bytes == prev_marked_bytes.
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185 hr->note_end_of_marking();
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186 // _prev_top_at_mark_start == top(),
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187 // _prev_marked_bytes == prev_marked_bytes
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188 }
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189 // If there is no mark in progress, we modified the _next variables
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190 // above needlessly, but harmlessly.
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191 if (_g1h->mark_in_progress()) {
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192 hr->note_start_of_marking(false);
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193 // _next_top_at_mark_start == top, _next_marked_bytes == 0
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194 // _next_marked_bytes == next_marked_bytes.
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195 }
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196 }
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197 }
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198 return false;
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199 }
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200 };
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201
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202 class G1ParRemoveSelfForwardPtrsTask: public AbstractGangTask {
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203 protected:
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204 G1CollectedHeap* _g1h;
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205
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206 public:
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207 G1ParRemoveSelfForwardPtrsTask(G1CollectedHeap* g1h) :
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208 AbstractGangTask("G1 Remove Self-forwarding Pointers"),
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209 _g1h(g1h) { }
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210
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211 void work(uint worker_id) {
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212 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set());
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213 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set());
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214 UpdateRSetDeferred deferred_update(_g1h, &dcq);
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215
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216 OopsInHeapRegionClosure *update_rset_cl = &deferred_update;
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217 if (!G1DeferredRSUpdate) {
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218 update_rset_cl = &immediate_update;
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219 }
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220
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221 RemoveSelfForwardPtrHRClosure rsfp_cl(_g1h, update_rset_cl);
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222
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223 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id);
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224 _g1h->collection_set_iterate_from(hr, &rsfp_cl);
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225 }
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226 };
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227
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228 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP