lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | #include <linux/fs.h> |
| 2 | #include <linux/init.h> |
| 3 | #include <linux/proc_fs.h> |
| 4 | #include <linux/sched.h> |
| 5 | #include <linux/seq_file.h> |
| 6 | #include <linux/time.h> |
| 7 | #include <linux/kernel_stat.h> |
| 8 | #include <asm/cputime.h> |
| 9 | |
| 10 | static int uptime_proc_show(struct seq_file *m, void *v) |
| 11 | { |
| 12 | struct timespec uptime; |
| 13 | struct timespec idle; |
| 14 | u64 idletime; |
| 15 | u64 nsec; |
| 16 | u32 rem; |
| 17 | int i; |
| 18 | |
| 19 | idletime = 0; |
| 20 | for_each_possible_cpu(i) |
| 21 | idletime += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE]; |
| 22 | |
| 23 | do_posix_clock_monotonic_gettime(&uptime); |
| 24 | monotonic_to_bootbased(&uptime); |
| 25 | nsec = cputime64_to_jiffies64(idletime) * TICK_NSEC; |
| 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 | |
| 36 | static int uptime_proc_open(struct inode *inode, struct file *file) |
| 37 | { |
| 38 | return single_open(file, uptime_proc_show, NULL); |
| 39 | } |
| 40 | |
| 41 | static const struct file_operations uptime_proc_fops = { |
| 42 | .open = uptime_proc_open, |
| 43 | .read = seq_read, |
| 44 | .llseek = seq_lseek, |
| 45 | .release = single_release, |
| 46 | }; |
| 47 | |
| 48 | static int __init proc_uptime_init(void) |
| 49 | { |
| 50 | proc_create("uptime", 0, NULL, &uptime_proc_fops); |
| 51 | return 0; |
| 52 | } |
| 53 | module_init(proc_uptime_init); |