LXR linux/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
  13static 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
  28static int loadavg_proc_open(struct inode *inode, struct file *file)
  29{
  30        return single_open(file, loadavg_proc_show, NULL);
  31}
  32
  33static 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
  40static int __init proc_loadavg_init(void)
  41{
  42        proc_create("loadavg", 0, NULL, &loadavg_proc_fops);
  43        return 0;
  44}
  45module_init(proc_loadavg_init);
  46