Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentZFThread.hpp @ 2132:4947ee68d19c
7008136: CMS: assert((HeapWord*)nextChunk <= _limit) failed: sweep invariant
Summary: The recorded _sweep_limit may not necessarily remain a block boundary as the old generation expands during a concurrent cycle. Terminal actions inside the sweep closure need to be aware of this as they cross over the limit.
Reviewed-by: johnc, minqi
author | ysr |
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date | Thu, 06 Jan 2011 23:50:02 -0800 |
parents | f95d63e2154a |
children |
rev | line source |
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342 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP | |
27 | |
28 #include "gc_implementation/shared/concurrentGCThread.hpp" | |
29 | |
342 | 30 // The Concurrent ZF Thread. Performs concurrent zero-filling. |
31 | |
32 class ConcurrentZFThread: public ConcurrentGCThread { | |
33 friend class VMStructs; | |
34 friend class ZeroFillRegionClosure; | |
35 | |
36 private: | |
37 | |
38 // Zero fill the heap region. | |
39 void processHeapRegion(HeapRegion* r); | |
40 | |
41 // Stats | |
42 // Allocation (protected by heap lock). | |
43 static int _region_allocs; // Number of regions allocated | |
44 static int _sync_zfs; // Synchronous zero-fills + | |
45 static int _zf_waits; // Wait for conc zero-fill completion. | |
46 | |
47 // Number of regions CFZ thread fills. | |
48 static int _regions_filled; | |
49 | |
50 double _vtime_start; // Initial virtual time. | |
51 | |
52 // These are static because the "print_summary_info" method is, and | |
53 // it currently assumes there is only one ZF thread. We'll change when | |
54 // we need to. | |
55 static double _vtime_accum; // Initial virtual time. | |
56 static double vtime_accum() { return _vtime_accum; } | |
57 | |
58 // Offer yield for GC. Returns true if yield occurred. | |
59 bool offer_yield(); | |
60 | |
61 public: | |
62 // Constructor | |
63 ConcurrentZFThread(); | |
64 | |
65 // Main loop. | |
66 virtual void run(); | |
67 | |
68 // Printing | |
1019 | 69 void print_on(outputStream* st) const; |
70 void print() const; | |
342 | 71 |
72 // Waits until "r" has been zero-filled. Requires caller to hold the | |
73 // ZF_mon. | |
74 static void wait_for_ZF_completed(HeapRegion* r); | |
75 | |
76 // Get or clear the current unclean region. Should be done | |
77 // while holding the ZF_needed_mon lock. | |
78 | |
79 // shutdown | |
794 | 80 void stop(); |
342 | 81 |
82 // Stats | |
83 static void note_region_alloc() {_region_allocs++; } | |
84 static void note_sync_zfs() { _sync_zfs++; } | |
85 static void note_zf_wait() { _zf_waits++; } | |
86 static void note_region_filled() { _regions_filled++; } | |
87 | |
88 static void print_summary_info(); | |
89 }; | |
1972 | 90 |
91 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP |