1 /*-
2 * Copyright (c) 2018 Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in
11 * the documentation and/or other materials provided with the
12 * distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #ifndef _LINUXKPI_LINUX_SWAP_H_
28 #define _LINUXKPI_LINUX_SWAP_H_
29
30 #include <sys/param.h>
31 #include <sys/domainset.h>
32 #include <sys/queue.h>
33 #include <sys/proc.h>
34 #include <sys/pcpu.h>
35
36 #include <vm/vm.h>
37 #include <vm/swap_pager.h>
38 #include <vm/vm_pageout.h>
39
40 static inline long
get_nr_swap_pages(void)41 get_nr_swap_pages(void)
42 {
43 int i, j;
44
45 /* NB: This could be done cheaply by obtaining swap_total directly */
46 swap_pager_status(&i, &j);
47 return i - j;
48 }
49
50 static inline int
current_is_kswapd(void)51 current_is_kswapd(void)
52 {
53
54 return (curproc == pageproc);
55 }
56
57 #endif
58