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
uptime_proc_show(struct seq_file * m,void * v)10 static int uptime_proc_show(struct seq_file *m, void *v)
11 {
12 struct timespec uptime;
13 struct timespec idle;
14 int i;
15 cputime_t idletime = cputime_zero;
16
17 for_each_possible_cpu(i)
18 idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);
19
20 do_posix_clock_monotonic_gettime(&uptime);
21 monotonic_to_bootbased(&uptime);
22 cputime_to_timespec(idletime, &idle);
23 seq_printf(m, "%lu.%02lu %lu.%02lu\n",
24 (unsigned long) uptime.tv_sec,
25 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
26 (unsigned long) idle.tv_sec,
27 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
28 return 0;
29 }
30
uptime_proc_open(struct inode * inode,struct file * file)31 static int uptime_proc_open(struct inode *inode, struct file *file)
32 {
33 return single_open(file, uptime_proc_show, NULL);
34 }
35
36 static const struct file_operations uptime_proc_fops = {
37 .open = uptime_proc_open,
38 .read = seq_read,
39 .llseek = seq_lseek,
40 .release = single_release,
41 };
42
proc_uptime_init(void)43 static int __init proc_uptime_init(void)
44 {
45 proc_create("uptime", 0, NULL, &uptime_proc_fops);
46 return 0;
47 }
48 module_init(proc_uptime_init);
49