vm_pageout.h revision 12453 
1/*
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	from: @(#)vm_pageout.h	8.2 (Berkeley) 1/12/94
37 *
38 *
39 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
40 * All rights reserved.
41 *
42 * Author: Avadis Tevanian, Jr.
43 *
44 * Permission to use, copy, modify and distribute this software and
45 * its documentation is hereby granted, provided that both the copyright
46 * notice and this permission notice appear in all copies of the
47 * software, derivative works or modified versions, and any portions
48 * thereof, and that both notices appear in supporting documentation.
49 *
50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
51 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
52 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
53 *
54 * Carnegie Mellon requests users of this software to return to
55 *
56 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
57 *  School of Computer Science
58 *  Carnegie Mellon University
59 *  Pittsburgh PA 15213-3890
60 *
61 * any improvements or extensions that they make and grant Carnegie the
62 * rights to redistribute these changes.
63 *
64 * $Id: vm_pageout.h,v 1.16 1995/11/20 12:19:22 phk Exp $
65 */
66
67#ifndef _VM_VM_PAGEOUT_H_
68#define _VM_VM_PAGEOUT_H_
69
70/*
71 *	Header file for pageout daemon.
72 */
73
74/*
75 *	Exported data structures.
76 */
77
78extern int vm_page_max_wired;
79extern int vm_pages_needed;	/* should be some "event" structure */
80extern int vm_pageout_pages_needed;
81
82#define VM_PAGEOUT_ASYNC 0
83#define VM_PAGEOUT_SYNC 1
84#define VM_PAGEOUT_FORCE 2
85
86/*
87 *	Exported routines.
88 */
89
90/*
91 *	Signal pageout-daemon and wait for it.
92 */
93
94static void pagedaemon_wakeup __P((void));
95static inline void
96pagedaemon_wakeup()
97{
98	if (!vm_pages_needed && curproc != pageproc) {
99		vm_pages_needed++;
100		wakeup(&vm_pages_needed);
101	}
102}
103
104#define VM_WAIT vm_wait()
105
106static void vm_wait __P((void));
107static inline void
108vm_wait()
109{
110	int s;
111
112	s = splhigh();
113	if (curproc == pageproc) {
114		vm_pageout_pages_needed = 1;
115		tsleep(&vm_pageout_pages_needed, PSWP, "vmwait", 0);
116	} else {
117		if (!vm_pages_needed) {
118			vm_pages_needed++;
119			wakeup(&vm_pages_needed);
120		}
121		tsleep(&cnt.v_free_count, PVM, "vmwait", 0);
122	}
123	splx(s);
124}
125
126
127#ifdef KERNEL
128void vm_pageout_page __P((vm_page_t, vm_object_t));
129void vm_pageout_cluster __P((vm_page_t, vm_object_t));
130int vm_pageout_flush __P((vm_page_t *, int, int));
131
132#endif
133
134#endif
135