uptime.c 1.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. #include <linux/fs.h>
  3. #include <linux/init.h>
  4. #include <linux/proc_fs.h>
  5. #include <linux/sched.h>
  6. #include <linux/seq_file.h>
  7. #include <linux/time.h>
  8. #include <linux/time_namespace.h>
  9. #include <linux/kernel_stat.h>
  10. static int uptime_proc_show(struct seq_file *m, void *v)
  11. {
  12. struct timespec64 uptime;
  13. struct timespec64 idle;
  14. u64 idle_nsec;
  15. u32 rem;
  16. int i;
  17. idle_nsec = 0;
  18. for_each_possible_cpu(i) {
  19. struct kernel_cpustat kcs;
  20. kcpustat_cpu_fetch(&kcs, i);
  21. idle_nsec += get_idle_time(&kcs, i);
  22. }
  23. ktime_get_boottime_ts64(&uptime);
  24. timens_add_boottime(&uptime);
  25. idle.tv_sec = div_u64_rem(idle_nsec, NSEC_PER_SEC, &rem);
  26. idle.tv_nsec = rem;
  27. seq_printf(m, "%lu.%02lu %lu.%02lu\n",
  28. (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)));
  32. return 0;
  33. }
  34. static int __init proc_uptime_init(void)
  35. {
  36. proc_create_single("uptime", 0, NULL, uptime_proc_show);
  37. return 0;
  38. }
  39. fs_initcall(proc_uptime_init);