fs/proc/loadavg.c

   1 #include <linux/fs.h>
   2 #include <linux/init.h>
   3 #include <linux/pid_namespace.h>
   4 #include <linux/proc_fs.h>
   5 #include <linux/sched.h>
   6 #include <linux/seq_file.h>
   7 #include <linux/seqlock.h>
   8 #include <linux/time.h>
   9
  10 #define LOAD_INT(x) ((x) >> FSHIFT)
  11 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  12
  13 static int loadavg_proc_show(struct seq_file *m, void *v)
  14 {
  15         unsigned long avnrun[3];
  16
  17         get_avenrun(avnrun, FIXED_1/200, 0);
  18
  19         seq_printf(m, "%lu.%02lu %lu.%02lu %lu.%02lu %ld/%d %d\n",
  20                 LOAD_INT(avnrun[0]), LOAD_FRAC(avnrun[0]),
  21                 LOAD_INT(avnrun[1]), LOAD_FRAC(avnrun[1]),
  22                 LOAD_INT(avnrun[2]), LOAD_FRAC(avnrun[2]),
  23                 nr_running(), nr_threads,
  24                 task_active_pid_ns(current)->last_pid);
  25         return 0;
  26 }
  27
  28 static int loadavg_proc_open(struct inode *inode, struct file *file)
  29 {
  30         return single_open(file, loadavg_proc_show, NULL);
  31 }
  32
  33 static const struct file_operations loadavg_proc_fops = {
  34         .open           = loadavg_proc_open,
  35         .read           = seq_read,
  36         .llseek         = seq_lseek,
  37         .release        = single_release,
  38 };
  39
  40 static int __init proc_loadavg_init(void)
  41 {
  42         proc_create("loadavg", 0, NULL, &loadavg_proc_fops);
  43         return 0;
  44 }
  45 module_init(proc_loadavg_init);