0
|
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 };
|