mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-21 10:05:00 +08:00
f3ae6c6e8a
Makefile already contains -D_GNU_SOURCE, so we can remove it from the *.c files. Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*
|
|
* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
// Test that values in /proc/uptime increment monotonically
|
|
// while shifting across CPUs.
|
|
#undef NDEBUG
|
|
#include <assert.h>
|
|
#include <unistd.h>
|
|
#include <sys/syscall.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "proc-uptime.h"
|
|
|
|
static inline int sys_sched_getaffinity(pid_t pid, unsigned int len, unsigned long *m)
|
|
{
|
|
return syscall(SYS_sched_getaffinity, pid, len, m);
|
|
}
|
|
|
|
static inline int sys_sched_setaffinity(pid_t pid, unsigned int len, unsigned long *m)
|
|
{
|
|
return syscall(SYS_sched_setaffinity, pid, len, m);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
unsigned int len;
|
|
unsigned long *m;
|
|
unsigned int cpu;
|
|
uint64_t u0, u1, i0, i1;
|
|
int fd;
|
|
|
|
/* find out "nr_cpu_ids" */
|
|
m = NULL;
|
|
len = 0;
|
|
do {
|
|
len += sizeof(unsigned long);
|
|
free(m);
|
|
m = malloc(len);
|
|
} while (sys_sched_getaffinity(0, len, m) == -EINVAL);
|
|
|
|
fd = open("/proc/uptime", O_RDONLY);
|
|
assert(fd >= 0);
|
|
|
|
proc_uptime(fd, &u0, &i0);
|
|
for (cpu = 0; cpu < len * 8; cpu++) {
|
|
memset(m, 0, len);
|
|
m[cpu / (8 * sizeof(unsigned long))] |= 1UL << (cpu % (8 * sizeof(unsigned long)));
|
|
|
|
/* CPU might not exist, ignore error */
|
|
sys_sched_setaffinity(0, len, m);
|
|
|
|
proc_uptime(fd, &u1, &i1);
|
|
assert(u1 >= u0);
|
|
assert(i1 >= i0);
|
|
u0 = u1;
|
|
i0 = i1;
|
|
}
|
|
|
|
return 0;
|
|
}
|