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annotate src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp @ 1960:878b57474103

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6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again Summary: An evacuation failure while copying the roots caused an object, A, to be forwarded to itself. During the subsequent RSet updating a reference to A was processed causing the reference to be added to the RSet of A's heap region. As a result of adding to the remembered set we ran into the issue described in 6930581 - the sparse table expanded and the RSet scanning code walked the cards in one instance of RHashTable (_cur) while the occupied() counts the cards in the expanded table (_next). Reviewed-by: tonyp, iveresov
author johnc
date Tue, 16 Nov 2010 14:07:33 -0800
parents c32059ef4dc0
children f95d63e2154a
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1 /*
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2 * Copyright (c) 2001, 2010, 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 inline size_t G1RemSet::n_workers() {
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26 if (_g1->workers() != NULL) {
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27 return _g1->workers()->total_workers();
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28 } else {
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29 return 1;
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30 }
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31 }
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32
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33 template <class T>
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34 inline void G1RemSet::write_ref(HeapRegion* from, T* p) {
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35 par_write_ref(from, p, 0);
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36 }
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37
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38 template <class T>
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39 inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) {
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40 oop obj = oopDesc::load_decode_heap_oop(p);
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41 #ifdef ASSERT
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42 // can't do because of races
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43 // assert(obj == NULL || obj->is_oop(), "expected an oop");
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44
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45 // Do the safe subset of is_oop
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46 if (obj != NULL) {
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47 #ifdef CHECK_UNHANDLED_OOPS
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48 oopDesc* o = obj.obj();
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49 #else
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50 oopDesc* o = obj;
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51 #endif // CHECK_UNHANDLED_OOPS
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52 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
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53 assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
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54 }
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55 #endif // ASSERT
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56
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57 assert(from == NULL || from->is_in_reserved(p), "p is not in from");
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58
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59 HeapRegion* to = _g1->heap_region_containing(obj);
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60 if (to != NULL && from != to) {
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61 #if G1_REM_SET_LOGGING
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62 gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS"
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63 " for region [" PTR_FORMAT ", " PTR_FORMAT ")",
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64 p, obj,
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65 to->bottom(), to->end());
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66 #endif
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67 assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
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68 to->rem_set()->add_reference(p, tid);
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69 }
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70 }
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71
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72 template <class T>
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73 inline void UpdateRSOopClosure::do_oop_work(T* p) {
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74 assert(_from != NULL, "from region must be non-NULL");
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75 _rs->par_write_ref(_from, p, _worker_i);
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76 }
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77
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78 template <class T>
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79 inline void UpdateRSetImmediate::do_oop_work(T* p) {
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80 assert(_from->is_in_reserved(p), "paranoia");
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81 T heap_oop = oopDesc::load_heap_oop(p);
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82 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {
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83 _g1_rem_set->par_write_ref(_from, p, 0);
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84 }
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85 }
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86
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87 template <class T>
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88 inline void UpdateRSOrPushRefOopClosure::do_oop_work(T* p) {
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89 oop obj = oopDesc::load_decode_heap_oop(p);
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90 #ifdef ASSERT
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91 // can't do because of races
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92 // assert(obj == NULL || obj->is_oop(), "expected an oop");
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93
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94 // Do the safe subset of is_oop
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95 if (obj != NULL) {
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96 #ifdef CHECK_UNHANDLED_OOPS
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97 oopDesc* o = obj.obj();
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98 #else
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99 oopDesc* o = obj;
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100 #endif // CHECK_UNHANDLED_OOPS
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101 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
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102 assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
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103 }
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104 #endif // ASSERT
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105
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106 assert(_from != NULL, "from region must be non-NULL");
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107
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108 HeapRegion* to = _g1->heap_region_containing(obj);
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109 if (to != NULL && _from != to) {
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110 // The _record_refs_into_cset flag is true during the RSet
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111 // updating part of an evacuation pause. It is false at all
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112 // other times:
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113 // * rebuilding the rembered sets after a full GC
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114 // * during concurrent refinement.
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115 // * updating the remembered sets of regions in the collection
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116 // set in the event of an evacuation failure (when deferred
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117 // updates are enabled).
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118
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119 if (_record_refs_into_cset && to->in_collection_set()) {
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120 // We are recording references that point into the collection
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121 // set and this particular reference does exactly that...
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122 // If the referenced object has already been forwarded
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123 // to itself, we are handling an evacuation failure and
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124 // we have already visited/tried to copy this object
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125 // there is no need to retry.
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126 if (!self_forwarded(obj)) {
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127 assert(_push_ref_cl != NULL, "should not be null");
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128 // Push the reference in the refs queue of the G1ParScanThreadState
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129 // instance for this worker thread.
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130 _push_ref_cl->do_oop(p);
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131 }
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132
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133 // Deferred updates to the CSet are either discarded (in the normal case),
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134 // or processed (if an evacuation failure occurs) at the end
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135 // of the collection.
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136 // See G1RemSet::cleanup_after_oops_into_collection_set_do().
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137 } else {
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parents: 1861
diff changeset
138 // We either don't care about pushing references that point into the
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
139 // collection set (i.e. we're not during an evacuation pause) _or_
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
140 // the reference doesn't point into the collection set. Either way
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
141 // we add the reference directly to the RSet of the region containing
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
142 // the referenced object.
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
143 _g1_rem_set->par_write_ref(_from, p, _worker_i);
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
144 }
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
145 }
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
146 }
878b57474103 6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again
johnc
parents: 1861
diff changeset
147