[PATCH] export nr_running and nr_iowait tasks in /proc

From Rik.

"this trivial patch, against 2.5-current, exports nr_running and
 nr_iowait_tasks in /proc/stat.  With this patch in vmstat will no
 longer need to walk all the processes in the system just to determine
 the number of running and blocked processes."

fs/proc/proc_misc.c

@@ -39,6 +39,7 @@
 #include <linux/seq_file.h>
 #include <linux/times.h>
 #include <linux/profile.h>
+#include <linux/blkdev.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -404,10 +405,14 @@ static int kstat_read_proc(char *page, char **start, off_t off,
 	len += sprintf(page + len,
 		"\nctxt %lu\n"
 		"btime %lu\n"
-		"processes %lu\n",
+		"processes %lu\n"
+		"procs_running %lu\n"
+		"procs_blocked %u\n",
 		nr_context_switches(),
 		xtime.tv_sec - jif / HZ,
-		total_forks);
+		total_forks,
+		nr_running(),
+		atomic_read(&nr_iowait_tasks));
 
 	return proc_calc_metrics(page, start, off, count, eof, len);
 }