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 <[email protected]>
--- ./drivers/block/ll_rw_blk.c.orig 2005-10-13 11:54:07.474907379 -0700
+++ ./drivers/block/ll_rw_blk.c 2005-10-13 11:54:39.074516367 -0700
@@ -2433,6 +2433,9 @@ void disk_round_stats(struct gendisk *di
{
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));
-
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