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/time_namespace.h>
9#include <linux/kernel_stat.h>
10
11static int uptime_proc_show(struct seq_file *m, void *v)
12{
13 struct timespec64 uptime;
14 struct timespec64 idle;
15 u64 nsec;
16 u32 rem;
17 int i;
18
19 nsec = 0;
20 for_each_possible_cpu(i)
21 nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
22
23 ktime_get_boottime_ts64(&uptime);
24 timens_add_boottime(&uptime);
25
26 idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
27 idle.tv_nsec = rem;
28 seq_printf(m, "%lu.%02lu %lu.%02lu\n",
29 (unsigned long) uptime.tv_sec,
30 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
31 (unsigned long) idle.tv_sec,
32 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
33 return 0;
34}
35
36static int __init proc_uptime_init(void)
37{
38 proc_create_single("uptime", 0, NULL, uptime_proc_show);
39 return 0;
40}
41fs_initcall(proc_uptime_init);