vm_pageout.h revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	from: @(#)vm_pageout.h	8.2 (Berkeley) 1/12/94
33 *
34 *
35 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
36 * All rights reserved.
37 *
38 * Author: Avadis Tevanian, Jr.
39 *
40 * Permission to use, copy, modify and distribute this software and
41 * its documentation is hereby granted, provided that both the copyright
42 * notice and this permission notice appear in all copies of the
43 * software, derivative works or modified versions, and any portions
44 * thereof, and that both notices appear in supporting documentation.
45 *
46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
47 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
49 *
50 * Carnegie Mellon requests users of this software to return to
51 *
52 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
53 *  School of Computer Science
54 *  Carnegie Mellon University
55 *  Pittsburgh PA 15213-3890
56 *
57 * any improvements or extensions that they make and grant Carnegie the
58 * rights to redistribute these changes.
59 *
60 * $FreeBSD: stable/11/sys/vm/vm_pageout.h 331722 2018-03-29 02:50:57Z eadler $
61 */
62
63#ifndef _VM_VM_PAGEOUT_H_
64#define _VM_VM_PAGEOUT_H_
65
66#ifdef _KERNEL
67
68/*
69 *	Header file for pageout daemon.
70 */
71
72/*
73 *	Exported data structures.
74 */
75
76extern int vm_page_max_wired;
77extern int vm_pageout_deficit;
78extern int vm_pageout_page_count;
79extern bool vm_pageout_wanted;
80extern bool vm_pages_needed;
81
82#define	VM_OOM_MEM	1
83#define	VM_OOM_SWAPZ	2
84
85/*
86 * vm_lowmem flags.
87 */
88#define	VM_LOW_KMEM	0x01
89#define	VM_LOW_PAGES	0x02
90
91/*
92 *	Exported routines.
93 */
94
95/*
96 *	Signal pageout-daemon and wait for it.
97 */
98
99void pagedaemon_wait(int pri, const char *wmesg);
100void pagedaemon_wakeup(void);
101#define VM_WAIT vm_wait()
102#define VM_WAITPFAULT vm_waitpfault()
103void vm_wait(void);
104void vm_waitpfault(void);
105
106int vm_pageout_flush(vm_page_t *, int, int, int, int *, boolean_t *);
107void vm_pageout_oom(int shortage);
108
109void vm_swapout_run(void);
110void vm_swapout_run_idle(void);
111#endif /* _KERNEL */
112#endif	/* _VM_VM_PAGEOUT_H_ */
113