/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	unsigned long time_avnrun = avg_nr_running();
17
18	get_avenrun(avnrun, FIXED_1/200, 0);
19
20	seq_printf(m, "%lu.%02lu %lu.%02lu %lu.%02lu %ld/%d %d %lu.%02lu\n",
21		LOAD_INT(avnrun[0]), LOAD_FRAC(avnrun[0]),
22		LOAD_INT(avnrun[1]), LOAD_FRAC(avnrun[1]),
23		LOAD_INT(avnrun[2]), LOAD_FRAC(avnrun[2]),
24		nr_running(), nr_threads,
25		task_active_pid_ns(current)->last_pid,
26		LOAD_INT(time_avnrun), LOAD_FRAC(time_avnrun));
27	return 0;
28}
29
30static int loadavg_proc_open(struct inode *inode, struct file *file)
31{
32	return single_open(file, loadavg_proc_show, NULL);
33}
34
35static 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
42static int __init proc_loadavg_init(void)
43{
44	proc_create("loadavg", 0, NULL, &loadavg_proc_fops);
45	return 0;
46}
47module_init(proc_loadavg_init);