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 int a, b, c; 16 unsigned long seq; 17 18 do { 19 seq = read_seqbegin(&xtime_lock); 20 a = avenrun[0] + (FIXED_1/200); 21 b = avenrun[1] + (FIXED_1/200); 22 c = avenrun[2] + (FIXED_1/200); 23 } while (read_seqretry(&xtime_lock, seq)); 24 25 seq_printf(m, "%d.%02d %d.%02d %d.%02d %ld/%d %d\n", 26 LOAD_INT(a), LOAD_FRAC(a), 27 LOAD_INT(b), LOAD_FRAC(b), 28 LOAD_INT(c), LOAD_FRAC(c), 29 nr_running(), nr_threads, 30 task_active_pid_ns(current)->last_pid); 31 return 0; 32 } 33 34 static int loadavg_proc_open(struct inode *inode, struct file *file) 35 { 36 return single_open(file, loadavg_proc_show, NULL); 37 } 38 39 static const struct file_operations loadavg_proc_fops = { 40 .open = loadavg_proc_open, 41 .read = seq_read, 42 .llseek = seq_lseek, 43 .release = single_release, 44 }; 45 46 static int __init proc_loadavg_init(void) 47 { 48 proc_create("loadavg", 0, NULL, &loadavg_proc_fops); 49 return 0; 50 } 51 module_init(proc_loadavg_init); 52