Commit b2982649 authored Oct 13, 2005 by Kenneth W Chen Committed by Jens Axboe Oct 28, 2005

Following the same idea, it occurs to me that we should only update


disk stat when "now" is different from disk->stamp.  Otherwise, we
are again needlessly adding zero to the stats.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Jens Axboe <axboe@suse.de>

parent 20e5c81f

drivers/block/ll_rw_blk.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -2433,6 +2433,9 @@ void disk_round_stats(struct gendisk *disk)
		{
		unsigned long now = jiffies;

		if (now == disk->stamp)
		return;

		if (disk->in_flight) {
		__disk_stat_add(disk, time_in_queue,
		disk->in_flight * (now - disk->stamp));