53 lines
1.2 KiB
C
Executable File
53 lines
1.2 KiB
C
Executable File
#include <linux/fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/time.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/cputime.h>
|
|
|
|
static int uptime_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
struct timespec uptime;
|
|
struct timespec idle;
|
|
u64 idletime;
|
|
u64 nsec;
|
|
u32 rem;
|
|
int i;
|
|
|
|
idletime = 0;
|
|
for_each_possible_cpu(i)
|
|
idletime += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
|
|
|
|
get_monotonic_boottime(&uptime);
|
|
nsec = cputime64_to_jiffies64(idletime) * TICK_NSEC;
|
|
idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
|
|
idle.tv_nsec = rem;
|
|
seq_printf(m, "%lu.%02lu %lu.%02lu\n",
|
|
(unsigned long) uptime.tv_sec,
|
|
(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
|
|
(unsigned long) idle.tv_sec,
|
|
(idle.tv_nsec / (NSEC_PER_SEC / 100)));
|
|
return 0;
|
|
}
|
|
|
|
static int uptime_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, uptime_proc_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations uptime_proc_fops = {
|
|
.open = uptime_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int __init proc_uptime_init(void)
|
|
{
|
|
proc_create("uptime", 0, NULL, &uptime_proc_fops);
|
|
return 0;
|
|
}
|
|
fs_initcall(proc_uptime_init);
|