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comparison src/share/vm/memory/blockOffsetTable.cpp @ 3746:537a4053b0f9

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7042740: CMS: assert(n> q) failed: Looping at: ... blockOffsetTable.cpp:557 Summary: Do a one-step look-ahead, when sweeping free or garbage blocks, to avoid overstepping sweep limit, which may become a non-block-boundary because of a heap expansion delta coalescing with a previously co-terminal free block. Reviewed-by: brutisso, tonyp
author ysr
date Mon, 23 May 2011 16:42:14 -0700
parents 7d64aa23eb96
children d2a62e0f25eb
comparison
equal deleted inserted replaced
3397:cfbca4d74a61 3746:537a4053b0f9
1 /* 1 /*
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
564 while (n <= addr) { 564 while (n <= addr) {
565 debug_only(HeapWord* last = q); // for debugging 565 debug_only(HeapWord* last = q); // for debugging
566 q = n; 566 q = n;
567 n += _sp->block_size(n); 567 n += _sp->block_size(n);
568 assert(n > q, 568 assert(n > q,
569 err_msg("Looping at n = " PTR_FORMAT " with last = " PTR_FORMAT " _sp = [" PTR_FORMAT "," PTR_FORMAT ")", 569 err_msg("Looping at n = " PTR_FORMAT " with last = " PTR_FORMAT","
570 n, last, _sp->bottom(), _sp->end())); 570 " while querying blk_start(" PTR_FORMAT ")"
571 } 571 " on _sp = [" PTR_FORMAT "," PTR_FORMAT ")",
572 assert(q <= addr, err_msg("wrong order for current (" INTPTR_FORMAT ") <= arg (" INTPTR_FORMAT ")", q, addr)); 572 n, last, addr, _sp->bottom(), _sp->end()));
573 assert(addr <= n, err_msg("wrong order for arg (" INTPTR_FORMAT ") <= next (" INTPTR_FORMAT ")", addr, n)); 573 }
574 assert(q <= addr,
575 err_msg("wrong order for current (" INTPTR_FORMAT ")" " <= arg (" INTPTR_FORMAT ")",
576 q, addr));
577 assert(addr <= n,
578 err_msg("wrong order for arg (" INTPTR_FORMAT ") <= next (" INTPTR_FORMAT ")",
579 addr, n));
574 return q; 580 return q;
575 } 581 }
576 582
577 HeapWord* BlockOffsetArrayNonContigSpace::block_start_careful( 583 HeapWord* BlockOffsetArrayNonContigSpace::block_start_careful(
578 const void* addr) const { 584 const void* addr) const {