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 #include <linux/pagemap.h>
41 #include <linux/page-flags.h>
42
43 static inline long
get_nr_swap_pages(void)44 get_nr_swap_pages(void)
45 {
46 int i, j;
47
48 /* NB: This could be done cheaply by obtaining swap_total directly */
49 swap_pager_status(&i, &j);
50 return i - j;
51 }
52
53 static inline int
current_is_kswapd(void)54 current_is_kswapd(void)
55 {
56
57 return (curproc == pageproc);
58 }
59
60 static inline void
folio_mark_accessed(struct folio * folio)61 folio_mark_accessed(struct folio *folio)
62 {
63 mark_page_accessed(&folio->page);
64 }
65
66 static inline void
check_move_unevictable_folios(struct folio_batch * fbatch)67 check_move_unevictable_folios(struct folio_batch *fbatch)
68 {
69 }
70
71 #endif
72