linux-kernel - Re: [PATCH 7/7] blk-iocost: Factor out the base vrate change into a separate function

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Date:   Wed, 25 Nov 2020 07:30:06 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc:     axboe@...nel.dk, baolin.wang7@...il.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] blk-iocost: Factor out the base vrate change into a
 separate function

Hello,

On Tue, Nov 24, 2020 at 11:33:36AM +0800, Baolin Wang wrote:
> @@ -2320,45 +2358,11 @@ static void ioc_timer_fn(struct timer_list *timer)
>  	ioc->busy_level = clamp(ioc->busy_level, -1000, 1000);
>  
>  	if (ioc->busy_level > 0 || (ioc->busy_level < 0 && !nr_lagging)) {
> -		u64 vrate = ioc->vtime_base_rate;
> -		u64 vrate_min = ioc->vrate_min, vrate_max = ioc->vrate_max;
...
> +		trace_iocost_ioc_vrate_adj(ioc, ioc->vtime_base_rate,
> +					   missed_ppm, rq_wait_pct,
>  					   nr_lagging, nr_shortages);
> -
> -		ioc->vtime_base_rate = vrate;
> -		ioc_refresh_margins(ioc);
>  	} else if (ioc->busy_level != prev_busy_level || nr_lagging) {
>  		trace_iocost_ioc_vrate_adj(ioc, atomic64_read(&ioc->vtime_rate),
>  					   missed_ppm, rq_wait_pct, nr_lagging,

I think it'd be better to factor out the surrounding if/else block together
(as early exit if blocks). Also, how about ioc_adjust_base_vrate()?

Thanks.

-- 
tejun