#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 <asm/cputime.h> static int uptime_proc_show(struct seq_file *m, void *v) { struct timespec uptime; struct timespec idle; int i; cputime_t idletime = cputime_zero; for_each_possible_cpu(i) idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle); do_posix_clock_monotonic_gettime(&uptime); monotonic_to_bootbased(&uptime); cputime_to_timespec(idletime, &idle); 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; } module_init(proc_uptime_init);