linux-kernel - Re: [PATCH 01/15] cfq-iosched: Properly name all references to IO class

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Date:	Wed, 3 Oct 2012 09:54:29 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk,
	cgroups@...r.kernel.org
Subject: Re: [PATCH 01/15] cfq-iosched: Properly name all references to IO
 class

On Mon, Oct 01, 2012 at 03:32:42PM -0400, Vivek Goyal wrote:
> Currently CFQ has three IO classes, RT, BE and IDLE. At many a places we
> are calling workloads belonging to these classes as "prio". This gets
> very confusing as one starts to associate it with ioprio.
> 
> So this patch just does bunch of renaming so that reading code becomes
> easier. All reference to RT, BE and IDLE workload are done using keyword
> "class" and all references to subclass, SYNC, SYNC-IDLE, ASYNC are made
> using keyword "type".
> 
> This makes me feel much better while I am reading the code. There is no
> functionality change due to this patch.
> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

> @@ -751,16 +751,16 @@ static enum wl_type_t cfqq_type(struct cfq_queue *cfqq)
>  	return SYNC_WORKLOAD;
>  }
>  
> -static inline int cfq_group_busy_queues_wl(enum wl_prio_t wl,
> +static inline int cfq_group_busy_queues_wl(enum wl_class_t wl_class,
>  					struct cfq_data *cfqd,
>  					struct cfq_group *cfqg)
>  {
> -	if (wl == IDLE_WORKLOAD)
> +	if (wl_class == IDLE_WORKLOAD)
>  		return cfqg->service_tree_idle.count;
>  
> -	return cfqg->service_trees[wl][ASYNC_WORKLOAD].count
> -		+ cfqg->service_trees[wl][SYNC_NOIDLE_WORKLOAD].count
> -		+ cfqg->service_trees[wl][SYNC_WORKLOAD].count;
> +	return cfqg->service_trees[wl_class][ASYNC_WORKLOAD].count
> +		+ cfqg->service_trees[wl_class][SYNC_NOIDLE_WORKLOAD].count
> +		+ cfqg->service_trees[wl_class][SYNC_WORKLOAD].count;

While at it, maybe move the operator to the end of the preceding line
like everybody else?

Thanks.

-- 
tejun
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