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

[Vivek Goyal <vgoyal redhat com>]

On Wed, Aug 19, 2009 at 11:36:22AM +0800, Gui Jianfeng wrote:
> 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>

thanks Gui. Queued for next posting.

Vivek

> ---
>  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
> 
>