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/sched/loadavg.h>
   7 #include <linux/sched/stat.h>
   8 #include <linux/seq_file.h>
   9 #include <linux/seqlock.h>
  10 #include <linux/time.h>
  11
  12 #define LOAD_INT(x) ((x) >> FSHIFT)
  13 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  14
  15 static int loadavg_proc_show(struct seq_file *m, void *v)
  16 {
  17         unsigned long avnrun[3];
  18
  19         get_avenrun(avnrun, FIXED_1/200, 0);
  20
  21         seq_printf(m, "%lu.%02lu %lu.%02lu %lu.%02lu %ld/%d %d\n",
  22                 LOAD_INT(avnrun[0]), LOAD_FRAC(avnrun[0]),
  23                 LOAD_INT(avnrun[1]), LOAD_FRAC(avnrun[1]),
  24                 LOAD_INT(avnrun[2]), LOAD_FRAC(avnrun[2]),
  25                 nr_running(), nr_threads,
  26                 task_active_pid_ns(current)->last_pid);
  27         return 0;
  28 }
  29
  30 static int loadavg_proc_open(struct inode *inode, struct file *file)
  31 {
  32         return single_open(file, loadavg_proc_show, NULL);
  33 }
  34
  35 static const struct file_operations loadavg_proc_fops = {
  36         .open           = loadavg_proc_open,
  37         .read           = seq_read,
  38         .llseek         = seq_lseek,
  39         .release        = single_release,
  40 };
  41
  42 static int __init proc_loadavg_init(void)
  43 {
  44         proc_create("loadavg", 0, NULL, &loadavg_proc_fops);
  45         return 0;
  46 }
  47 fs_initcall(proc_loadavg_init);