[dm-devel] Re: [PATCH 03/24] io-controller: Common flat fair queuing code in elevaotor layer

[Gui Jianfeng <guijianfeng cn fujitsu com>]

Vivek Goyal wrote:
...

> +
> +static void elv_preempt_queue(struct request_queue *q, struct io_queue *ioq)
> +{
> +	elv_log_ioq(q->elevator->efqd, ioq, "preempt");
> +	elv_slice_expired(q);
> +
> +	/*
> +	 * Put the new queue at the front of the of the current list,
> +	 * so we know that it will be selected next.
> +	 */
> +
> +	requeue_ioq(ioq);
> +	ioq->slice_start = ioq->slice_end = 0;

I think this assignment is redundant because these two members will be reset
when this ioq is scheduled.

Signed-off-by: Gui Jianfeng <guijianfeng cn fujitsu com>
---
 block/elevator-fq.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index d04e925..b3c387d 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -2650,7 +2650,6 @@ static void elv_preempt_queue(struct request_queue *q, struct io_queue *ioq)
 		 */
 
 		requeue_ioq(ioq);
-		ioq->slice_start = ioq->slice_end = 0;
 		elv_mark_ioq_slice_new(ioq);
 	}
 }
-- 
1.5.4.rc3