blob: a3bd243f5c58aeb96a0b1910d1ba3879246491f8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
// SPDX-License-Identifier: GPL-2.0
#ifndef MEMCONTROL_COMMON_H__
#define MEMCONTROL_COMMON_H__
#include <stdlib.h>
#include <stdio.h>
#include "tst_test.h"
#define TMPDIR "mntdir"
#define MB(x) (x << 20)
/*
* Checks if two given values differ by less than err% of their
* sum. An extra percent is added for every doubling of the page size
* to compensate for wastage in page sized allocations.
*/
static inline int values_close(const ssize_t a,
const ssize_t b,
const ssize_t err)
{
const size_t page_size = SAFE_SYSCONF(_SC_PAGESIZE);
const ssize_t page_adjusted_err = ffs(page_size >> 13) + err;
return 100 * labs(a - b) <= (a + b) * page_adjusted_err;
}
static inline void alloc_pagecache(const int fd, size_t size)
{
char buf[BUFSIZ];
size_t i;
SAFE_LSEEK(fd, 0, SEEK_END);
for (i = 0; i < size; i += sizeof(buf))
SAFE_WRITE(SAFE_WRITE_ALL, fd, buf, sizeof(buf));
}
static inline void alloc_anon(const size_t size)
{
const size_t page_size = SAFE_SYSCONF(_SC_PAGESIZE);
char *const buf = SAFE_MALLOC(size);
size_t i;
for (i = 0; i < size; i += page_size)
buf[i] = 0;
free(buf);
}
#endif /* MEMCONTROL_COMMON_H__ */
|
