1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #ifndef MEMCONTROL_COMMON_H__
4 #define MEMCONTROL_COMMON_H__
5
6 #include <stdlib.h>
7 #include <stdio.h>
8
9 #include "tst_test.h"
10
11 #define TMPDIR "mntdir"
12 #define MB(x) (x << 20)
13
14 /*
15 * Checks if two given values differ by less than err% of their
16 * sum. An extra percent is added for every doubling of the page size
17 * to compensate for wastage in page sized allocations.
18 */
values_close(const ssize_t a,const ssize_t b,const ssize_t err)19 static inline int values_close(const ssize_t a,
20 const ssize_t b,
21 const ssize_t err)
22 {
23 const size_t page_size = SAFE_SYSCONF(_SC_PAGESIZE);
24 const ssize_t page_adjusted_err = ffs(page_size >> 13) + err;
25
26 return 100 * labs(a - b) <= (a + b) * page_adjusted_err;
27 }
28
alloc_pagecache(const int fd,size_t size)29 static inline void alloc_pagecache(const int fd, size_t size)
30 {
31 char buf[BUFSIZ];
32 size_t i;
33
34 SAFE_LSEEK(fd, 0, SEEK_END);
35
36 for (i = 0; i < size; i += sizeof(buf))
37 SAFE_WRITE(SAFE_WRITE_ALL, fd, buf, sizeof(buf));
38 }
39
alloc_anon(const size_t size)40 static inline void alloc_anon(const size_t size)
41 {
42 const size_t page_size = SAFE_SYSCONF(_SC_PAGESIZE);
43 char *const buf = SAFE_MALLOC(size);
44 size_t i;
45
46 for (i = 0; i < size; i += page_size)
47 buf[i] = 0;
48
49 free(buf);
50 }
51
52 #endif /* MEMCONTROL_COMMON_H__ */
53