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Following the same idea, it occurs to me that we should only update
author
Chen, Kenneth W
<kenneth.w.chen@intel.com>
Thu, 13 Oct 2005 19:49:29 +0000
(21:49 +0200)
committer
Jens Axboe
<axboe@nelson.home.kernel.dk>
Fri, 28 Oct 2005 06:15:43 +0000
(08:15 +0200)
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>
drivers/block/ll_rw_blk.c
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diff --git
a/drivers/block/ll_rw_blk.c
b/drivers/block/ll_rw_blk.c
index
c42071f
..
4e2b1b0
100644
(file)
--- a/
drivers/block/ll_rw_blk.c
+++ b/
drivers/block/ll_rw_blk.c
@@
-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));