FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_pageout.h
1 /*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
3 *
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * The Mach Operating System project at Carnegie-Mellon University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)vm_pageout.h 8.2 (Berkeley) 1/12/94
35 *
36 *
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
39 *
40 * Author: Avadis Tevanian, Jr.
41 *
42 * Permission to use, copy, modify and distribute this software and
43 * its documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
47 *
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
51 *
52 * Carnegie Mellon requests users of this software to return to
53 *
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
58 *
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
61 *
62 * $FreeBSD: releng/12.0/sys/vm/vm_pageout.h 338507 2018-09-06 19:28:52Z markj $
63 */
64
65 #ifndef _VM_VM_PAGEOUT_H_
66 #define _VM_VM_PAGEOUT_H_
67
68 #ifdef _KERNEL
69
70 /*
71 * Header file for pageout daemon.
72 */
73
74 /*
75 * Exported data structures.
76 */
77
78 extern int vm_page_max_wired;
79 extern int vm_pageout_page_count;
80
81 #define VM_OOM_MEM 1
82 #define VM_OOM_SWAPZ 2
83
84 /*
85 * vm_lowmem flags.
86 */
87 #define VM_LOW_KMEM 0x01
88 #define VM_LOW_PAGES 0x02
89
90 /*
91 * Exported routines.
92 */
93
94 /*
95 * Signal pageout-daemon and wait for it.
96 */
97
98 void vm_wait(vm_object_t obj);
99 void vm_waitpfault(struct domainset *);
100 void vm_wait_domain(int domain);
101 void vm_wait_min(void);
102 void vm_wait_severe(void);
103
104 int vm_pageout_flush(vm_page_t *, int, int, int, int *, boolean_t *);
105 void vm_pageout_oom(int shortage);
106
107 void vm_swapout_run(void);
108 void vm_swapout_run_idle(void);
109 #endif /* _KERNEL */
110 #endif /* _VM_VM_PAGEOUT_H_ */
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