From b740d98f5614e34b4cff2e1e67826f007c8d4f30 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 10 Nov 2005 18:20:16 +0100 Subject: [BLOCK] cfq-iosched: fix slice_left calculation When cfq slice expires, remainder of slice is calculated and stored in cfqq->slice_left. Current code calculates the opposite of remainder - how many jiffies the cfqq has used past slice end. This patch fixes the bug. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'block') diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 452538644bce..2b64f5852bfd 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -861,8 +861,8 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, * store what was left of this slice, if the queue idled out * or was preempted */ - if (time_after(now, cfqq->slice_end)) - cfqq->slice_left = now - cfqq->slice_end; + if (time_after(cfqq->slice_end, now)) + cfqq->slice_left = cfqq->slice_end - now; else cfqq->slice_left = 0; -- cgit v1.2.3-58-ga151