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 | #include "internal.h" |
11 | |
12 | static int uptime_proc_show(struct seq_file *m, void *v) |
13 | { |
14 | struct timespec64 uptime; |
15 | struct timespec64 idle; |
16 | u64 idle_nsec; |
17 | u32 rem; |
18 | int i; |
19 | |
20 | idle_nsec = 0; |
21 | for_each_possible_cpu(i) { |
22 | struct kernel_cpustat kcs; |
23 | |
24 | kcpustat_cpu_fetch(dst: &kcs, cpu: i); |
25 | idle_nsec += get_idle_time(kcs: &kcs, cpu: i); |
26 | } |
27 | |
28 | ktime_get_boottime_ts64(ts: &uptime); |
29 | timens_add_boottime(ts: &uptime); |
30 | |
31 | idle.tv_sec = div_u64_rem(dividend: idle_nsec, NSEC_PER_SEC, remainder: &rem); |
32 | idle.tv_nsec = rem; |
33 | seq_printf(m, fmt: "%lu.%02lu %lu.%02lu\n" , |
34 | (unsigned long) uptime.tv_sec, |
35 | (uptime.tv_nsec / (NSEC_PER_SEC / 100)), |
36 | (unsigned long) idle.tv_sec, |
37 | (idle.tv_nsec / (NSEC_PER_SEC / 100))); |
38 | return 0; |
39 | } |
40 | |
41 | static int __init proc_uptime_init(void) |
42 | { |
43 | struct proc_dir_entry *pde; |
44 | |
45 | pde = proc_create_single("uptime" , 0, NULL, uptime_proc_show); |
46 | pde_make_permanent(pde); |
47 | return 0; |
48 | } |
49 | fs_initcall(proc_uptime_init); |
50 | |