linux-kernel - Re: [PATCH] cfq-iosched: don't check cfqg in choose_service

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Date:	Tue, 14 Dec 2010 17:25:19 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cfq-iosched: don't check cfqg in choose_service_tree()

On Tue, Dec 14, 2010 at 02:32:28PM +0800, Gui Jianfeng wrote:
> When cfq_choose_cfqg() is called in select_queue(), there must be at least one
> backlogged CFQ queue waiting for dispatching, hence there must be at least one
> backlogged CFQ group on service tree. So we never call choose_service_tree()
> with cfqg == NULL.
> 
> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
> ---

Thanks Gui for the cleanup. This patch looks good to me.

Acked-by: Vivek Goyal <vgoyal@...hat.com>

Vivek

>  block/cfq-iosched.c |    6 ------
>  1 files changed, 0 insertions(+), 6 deletions(-)
> 
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index 9b186fd..c19d015 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -2103,12 +2103,6 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
>  	unsigned group_slice;
>  	enum wl_prio_t original_prio = cfqd->serving_prio;
>  
> -	if (!cfqg) {
> -		cfqd->serving_prio = IDLE_WORKLOAD;
> -		cfqd->workload_expires = jiffies + 1;
> -		return;
> -	}
> -
>  	/* Choose next priority. RT > BE > IDLE */
>  	if (cfq_group_busy_queues_wl(RT_WORKLOAD, cfqd, cfqg))
>  		cfqd->serving_prio = RT_WORKLOAD;
> -- 
> 1.6.5.2
> 
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