| 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(&kcs, i); |
| 25 | idle_nsec += get_idle_time(&kcs, i); |
| 26 | } |
| 27 | |
| 28 | ktime_get_boottime_ts64(&uptime); |
| 29 | timens_add_boottime(&uptime); |
| 30 | |
| 31 | idle.tv_sec = div_u64_rem(idle_nsec, NSEC_PER_SEC, &rem); |
| 32 | idle.tv_nsec = rem; |
| 33 | seq_printf(m, "%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); |