| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | |
| 10 | static 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 | |
| 33 | static int __init proc_uptime_init(void) |
| 34 | { |
| 35 | proc_create_single("uptime", 0, NULL, uptime_proc_show); |
| 36 | return 0; |
| 37 | } |
| 38 | fs_initcall(proc_uptime_init); |