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comparison src/share/vm/runtime/sweeper.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // An NmethodSweeper is an incremental cleaner for:
26 // - cleanup inline caches
27 // - reclamation of unreferences zombie nmethods
28 //
29
30 class NMethodSweeper : public AllStatic {
31 static long _traversals; // Stack traversal count
32 static CodeBlob* _current; // Current nmethod
33 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
34 static int _invocations; // No. of invocations left until we are completed with this pass
35
36 static bool _rescan; // Indicates that we should do a full rescan of the
37 // of the code cache looking for work to do.
38 static int _locked_seen; // Number of locked nmethods encountered during the scan
39 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
40
41
42 static void process_nmethod(nmethod *nm);
43 public:
44 static long traversal_count() { return _traversals; }
45
46 static void sweep(); // Invoked at the end of each safepoint
47
48 static void notify(nmethod* nm) {
49 // Perform a full scan of the code cache from the beginning. No
50 // need to synchronize the setting of this flag since it only
51 // changes to false at safepoint so we can never overwrite it with false.
52 _rescan = true;
53 }
54 };