blob: 061894625903ded399f2ab9285daa5f69adba854 [file] [log] [blame]
Alexey Dobriyana9caa3d2009-02-20 17:07:22 +03001#include <linux/fs.h>
Alexey Dobriyan96177602008-10-03 02:38:18 +04002#include <linux/init.h>
3#include <linux/proc_fs.h>
4#include <linux/sched.h>
Alexey Dobriyana9caa3d2009-02-20 17:07:22 +03005#include <linux/seq_file.h>
Alexey Dobriyan96177602008-10-03 02:38:18 +04006#include <linux/time.h>
Michael Abbott96830a52009-09-24 10:15:19 +02007#include <linux/kernel_stat.h>
Alexey Dobriyan96177602008-10-03 02:38:18 +04008#include <asm/cputime.h>
9
Alexey Dobriyana9caa3d2009-02-20 17:07:22 +030010static int uptime_proc_show(struct seq_file *m, void *v)
Alexey Dobriyan96177602008-10-03 02:38:18 +040011{
12 struct timespec uptime;
13 struct timespec idle;
Martin Schwidefsky612ef282011-12-19 19:23:15 +010014 u64 idletime;
Martin Schwidefskyc3e0ef92011-12-15 14:56:10 +010015 u64 nsec;
16 u32 rem;
Michael Abbott96830a52009-09-24 10:15:19 +020017 int i;
Michael Abbott96830a52009-09-24 10:15:19 +020018
Martin Schwidefskyc3e0ef92011-12-15 14:56:10 +010019 idletime = 0;
Michael Abbott96830a52009-09-24 10:15:19 +020020 for_each_possible_cpu(i)
Martin Schwidefsky612ef282011-12-19 19:23:15 +010021 idletime += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
Alexey Dobriyan96177602008-10-03 02:38:18 +040022
Oleg Nesterov1d98a5f2013-07-03 15:08:27 -070023 get_monotonic_boottime(&uptime);
Martin Schwidefskyc3e0ef92011-12-15 14:56:10 +010024 nsec = cputime64_to_jiffies64(idletime) * TICK_NSEC;
25 idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
26 idle.tv_nsec = rem;
Alexey Dobriyana9caa3d2009-02-20 17:07:22 +030027 seq_printf(m, "%lu.%02lu %lu.%02lu\n",
Alexey Dobriyan96177602008-10-03 02:38:18 +040028 (unsigned long) uptime.tv_sec,
29 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
30 (unsigned long) idle.tv_sec,
31 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
Alexey Dobriyana9caa3d2009-02-20 17:07:22 +030032 return 0;
Alexey Dobriyan96177602008-10-03 02:38:18 +040033}
34
Alexey Dobriyana9caa3d2009-02-20 17:07:22 +030035static int uptime_proc_open(struct inode *inode, struct file *file)
36{
37 return single_open(file, uptime_proc_show, NULL);
38}
39
40static const struct file_operations uptime_proc_fops = {
41 .open = uptime_proc_open,
42 .read = seq_read,
43 .llseek = seq_lseek,
44 .release = single_release,
45};
46
Alexey Dobriyan96177602008-10-03 02:38:18 +040047static int __init proc_uptime_init(void)
48{
Alexey Dobriyana9caa3d2009-02-20 17:07:22 +030049 proc_create("uptime", 0, NULL, &uptime_proc_fops);
Alexey Dobriyan96177602008-10-03 02:38:18 +040050 return 0;
51}
52module_init(proc_uptime_init);