Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp @ 1960:878b57474103
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 | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 2001, 2007, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ inline HeapRegion* HeapRegionSeq::addr_to_region(const void* addr) { assert(_seq_bottom != NULL, "bad _seq_bottom in addr_to_region"); if ((char*) addr >= _seq_bottom) { size_t diff = (size_t) pointer_delta((HeapWord*) addr, (HeapWord*) _seq_bottom); int index = (int) (diff >> HeapRegion::LogOfHRGrainWords); assert(index >= 0, "invariant / paranoia"); if (index < _regions.length()) { HeapRegion* hr = _regions.at(index); assert(hr->is_in_reserved(addr), "addr_to_region is wrong..."); return hr; } } return NULL; }