Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp @ 4787:2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object).
Reviewed-by: johnc, brutisso
| author | tonyp |
|---|---|
| date | Tue, 10 Jan 2012 18:58:13 -0500 |
| parents | 23d434c6290d |
| children | 2e966d967c5c |
| rev | line source |
|---|---|
| 3771 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 3771 | 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 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP | |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/concurrentMark.hpp" | |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 | |
| 31 inline void CMTask::push(oop obj) { | |
| 32 HeapWord* objAddr = (HeapWord*) obj; | |
| 33 assert(_g1h->is_in_g1_reserved(objAddr), "invariant"); | |
| 34 assert(!_g1h->is_on_master_free_list( | |
| 35 _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant"); | |
| 36 assert(!_g1h->is_obj_ill(obj), "invariant"); | |
| 37 assert(_nextMarkBitMap->isMarked(objAddr), "invariant"); | |
| 38 | |
| 39 if (_cm->verbose_high()) { | |
| 40 gclog_or_tty->print_cr("[%d] pushing "PTR_FORMAT, _task_id, (void*) obj); | |
| 41 } | |
| 42 | |
| 43 if (!_task_queue->push(obj)) { | |
| 44 // The local task queue looks full. We need to push some entries | |
| 45 // to the global stack. | |
| 46 | |
| 47 if (_cm->verbose_medium()) { | |
| 48 gclog_or_tty->print_cr("[%d] task queue overflow, " | |
| 49 "moving entries to the global stack", | |
| 50 _task_id); | |
| 51 } | |
| 52 move_entries_to_global_stack(); | |
| 53 | |
| 54 // this should succeed since, even if we overflow the global | |
| 55 // stack, we should have definitely removed some entries from the | |
| 56 // local queue. So, there must be space on it. | |
| 57 bool success = _task_queue->push(obj); | |
| 58 assert(success, "invariant"); | |
| 59 } | |
| 60 | |
| 61 statsOnly( int tmp_size = _task_queue->size(); | |
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62 if (tmp_size > _local_max_size) { |
| 3771 | 63 _local_max_size = tmp_size; |
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64 } |
| 3771 | 65 ++_local_pushes ); |
| 66 } | |
| 67 | |
| 68 // This determines whether the method below will check both the local | |
| 69 // and global fingers when determining whether to push on the stack a | |
| 70 // gray object (value 1) or whether it will only check the global one | |
| 71 // (value 0). The tradeoffs are that the former will be a bit more | |
| 72 // accurate and possibly push less on the stack, but it might also be | |
| 73 // a little bit slower. | |
| 74 | |
| 75 #define _CHECK_BOTH_FINGERS_ 1 | |
| 76 | |
| 77 inline void CMTask::deal_with_reference(oop obj) { | |
| 78 if (_cm->verbose_high()) { | |
| 79 gclog_or_tty->print_cr("[%d] we're dealing with reference = "PTR_FORMAT, | |
| 80 _task_id, (void*) obj); | |
| 81 } | |
| 82 | |
| 83 ++_refs_reached; | |
| 84 | |
| 85 HeapWord* objAddr = (HeapWord*) obj; | |
| 86 assert(obj->is_oop_or_null(true /* ignore mark word */), "Error"); | |
| 87 if (_g1h->is_in_g1_reserved(objAddr)) { | |
| 88 assert(obj != NULL, "null check is implicit"); | |
| 89 if (!_nextMarkBitMap->isMarked(objAddr)) { | |
| 90 // Only get the containing region if the object is not marked on the | |
| 91 // bitmap (otherwise, it's a waste of time since we won't do | |
| 92 // anything with it). | |
| 93 HeapRegion* hr = _g1h->heap_region_containing_raw(obj); | |
| 94 if (!hr->obj_allocated_since_next_marking(obj)) { | |
| 95 if (_cm->verbose_high()) { | |
| 96 gclog_or_tty->print_cr("[%d] "PTR_FORMAT" is not considered marked", | |
| 97 _task_id, (void*) obj); | |
| 98 } | |
| 99 | |
| 100 // we need to mark it first | |
| 101 if (_nextMarkBitMap->parMark(objAddr)) { | |
| 102 // No OrderAccess:store_load() is needed. It is implicit in the | |
| 103 // CAS done in parMark(objAddr) above | |
| 104 HeapWord* global_finger = _cm->finger(); | |
| 105 | |
| 106 #if _CHECK_BOTH_FINGERS_ | |
| 107 // we will check both the local and global fingers | |
| 108 | |
| 109 if (_finger != NULL && objAddr < _finger) { | |
| 110 if (_cm->verbose_high()) { | |
| 111 gclog_or_tty->print_cr("[%d] below the local finger ("PTR_FORMAT"), " | |
| 112 "pushing it", _task_id, _finger); | |
| 113 } | |
| 114 push(obj); | |
| 115 } else if (_curr_region != NULL && objAddr < _region_limit) { | |
| 116 // do nothing | |
| 117 } else if (objAddr < global_finger) { | |
| 118 // Notice that the global finger might be moving forward | |
| 119 // concurrently. This is not a problem. In the worst case, we | |
| 120 // mark the object while it is above the global finger and, by | |
| 121 // the time we read the global finger, it has moved forward | |
| 122 // passed this object. In this case, the object will probably | |
| 123 // be visited when a task is scanning the region and will also | |
| 124 // be pushed on the stack. So, some duplicate work, but no | |
| 125 // correctness problems. | |
| 126 | |
| 127 if (_cm->verbose_high()) { | |
| 128 gclog_or_tty->print_cr("[%d] below the global finger " | |
| 129 "("PTR_FORMAT"), pushing it", | |
| 130 _task_id, global_finger); | |
| 131 } | |
| 132 push(obj); | |
| 133 } else { | |
| 134 // do nothing | |
| 135 } | |
| 136 #else // _CHECK_BOTH_FINGERS_ | |
| 137 // we will only check the global finger | |
| 138 | |
| 139 if (objAddr < global_finger) { | |
| 140 // see long comment above | |
| 141 | |
| 142 if (_cm->verbose_high()) { | |
| 143 gclog_or_tty->print_cr("[%d] below the global finger " | |
| 144 "("PTR_FORMAT"), pushing it", | |
| 145 _task_id, global_finger); | |
| 146 } | |
| 147 push(obj); | |
| 148 } | |
| 149 #endif // _CHECK_BOTH_FINGERS_ | |
| 150 } | |
| 151 } | |
| 152 } | |
| 153 } | |
| 154 } | |
| 155 | |
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156 inline void ConcurrentMark::markPrev(oop p) { |
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157 assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity"); |
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158 // Note we are overriding the read-only view of the prev map here, via |
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159 // the cast. |
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160 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p); |
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161 } |
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162 |
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163 inline void ConcurrentMark::markNext(oop p) { |
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164 assert(!_nextMarkBitMap->isMarked((HeapWord*) p), "sanity"); |
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165 _nextMarkBitMap->mark((HeapWord*) p); |
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166 } |
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167 |
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168 inline void ConcurrentMark::grayRoot(oop obj, size_t word_size) { |
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169 HeapWord* addr = (HeapWord*) obj; |
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170 |
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171 // Currently we don't do anything with word_size but we will use it |
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172 // in the very near future in the liveness calculation piggy-backing |
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173 // changes. |
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174 |
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175 #ifdef ASSERT |
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176 HeapRegion* hr = _g1h->heap_region_containing(addr); |
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177 assert(hr != NULL, "sanity"); |
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178 assert(!hr->is_survivor(), "should not allocate survivors during IM"); |
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179 assert(addr < hr->next_top_at_mark_start(), |
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180 err_msg("addr: "PTR_FORMAT" hr: "HR_FORMAT" NTAMS: "PTR_FORMAT, |
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181 addr, HR_FORMAT_PARAMS(hr), hr->next_top_at_mark_start())); |
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182 // We cannot assert that word_size == obj->size() given that obj |
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183 // might not be in a consistent state (another thread might be in |
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184 // the process of copying it). So the best thing we can do is to |
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185 // assert that word_size is under an upper bound which is its |
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186 // containing region's capacity. |
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187 assert(word_size * HeapWordSize <= hr->capacity(), |
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188 err_msg("size: "SIZE_FORMAT" capacity: "SIZE_FORMAT" "HR_FORMAT, |
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189 word_size * HeapWordSize, hr->capacity(), |
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190 HR_FORMAT_PARAMS(hr))); |
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191 #endif // ASSERT |
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192 |
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193 if (!_nextMarkBitMap->isMarked(addr)) { |
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194 _nextMarkBitMap->parMark(addr); |
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195 } |
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196 } |
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197 |
| 3771 | 198 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP |