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 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 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 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