tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/fs.h>
3#include <linux/init.h>
4#include <linux/proc_fs.h>
5#include <linux/sched.h>
6#include <linux/seq_file.h>
7#include <linux/time.h>
8#include <linux/kernel_stat.h>
9
10static int uptime_proc_show(struct seq_file *m, void *v)
11{
12 struct timespec64 uptime;
13 struct timespec64 idle;
14 u64 nsec;
15 u32 rem;
16 int i;
17
18 nsec = 0;
19 for_each_possible_cpu(i)
20 nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
21
22 ktime_get_boottime_ts64(&uptime);
23 idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
24 idle.tv_nsec = rem;
25 seq_printf(m, "%lu.%02lu %lu.%02lu\n",
26 (unsigned long) uptime.tv_sec,
27 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
28 (unsigned long) idle.tv_sec,
29 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
30 return 0;
31}
32
33static int __init proc_uptime_init(void)
34{
35 proc_create_single("uptime", 0, NULL, uptime_proc_show);
36 return 0;
37}
38fs_initcall(proc_uptime_init);