linux-kernel - Re: [PATCH] cfq-iosched: Get rid of on

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Date:	Tue, 30 Nov 2010 09:23:49 -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: Get rid of on_st flag

On Tue, Nov 30, 2010 at 04:41:31PM +0800, Gui Jianfeng wrote:
> It's able to check whether a CFQ group on a service tree by
> checking "cfqg->rb_node". There's no need to maintain an
> extra flag here.
> 
> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
> Acked-by: Vivek Goyal <vgoyal@...hat.com>

Looks good to me.

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

Vivek

> ---
>  block/cfq-iosched.c |    5 +----
>  1 files changed, 1 insertions(+), 4 deletions(-)
> 
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index e18d316..5d0349d 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -179,7 +179,6 @@ struct cfq_group {
>  	/* group service_tree key */
>  	u64 vdisktime;
>  	unsigned int weight;
> -	bool on_st;
>  
>  	/* number of cfqq currently on this group */
>  	int nr_cfqq;
> @@ -863,7 +862,7 @@ cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg)
>  	struct rb_node *n;
>  
>  	cfqg->nr_cfqq++;
> -	if (cfqg->on_st)
> +	if (!RB_EMPTY_NODE(&cfqg->rb_node))
>  		return;
>  
>  	/*
> @@ -879,7 +878,6 @@ cfq_group_service_tree_add(struct cfq_data *cfqd, struct cfq_group *cfqg)
>  		cfqg->vdisktime = st->min_vdisktime;
>  
>  	__cfq_group_service_tree_add(st, cfqg);
> -	cfqg->on_st = true;
>  	st->total_weight += cfqg->weight;
>  }
>  
> @@ -896,7 +894,6 @@ cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
>  		return;
>  
>  	cfq_log_cfqg(cfqd, cfqg, "del_from_rr group");
> -	cfqg->on_st = false;
>  	st->total_weight -= cfqg->weight;
>  	if (!RB_EMPTY_NODE(&cfqg->rb_node))
>  		cfq_rb_erase(&cfqg->rb_node, st);
> -- 
> 1.6.5.2
> 
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