linux-kernel - Re: [PATCH 1/4] block: add scalable completion tracking of requests

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Message-ID: <20161101222550.u64m4txqjgoohwbv@linux-x5ow.site>
Date:   Tue, 1 Nov 2016 16:25:51 -0600
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Jens Axboe <axboe@...com>
Cc:     axboe@...nel.dk, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, hch@....de
Subject: Re: [PATCH 1/4] block: add scalable completion tracking of requests

On Tue, Nov 01, 2016 at 03:05:22PM -0600, Jens Axboe wrote:
> For legacy block, we simply track them in the request queue. For
> blk-mq, we track them on a per-sw queue basis, which we can then
> sum up through the hardware queues and finally to a per device
> state.
> 
> The stats are tracked in, roughly, 0.1s interval windows.
> 
> Add sysfs files to display the stats.
> 
> Signed-off-by: Jens Axboe <axboe@...com>
> ---

[...]

>  
>  	/* incremented at completion time */
>  	unsigned long		____cacheline_aligned_in_smp rq_completed[2];
> +	struct blk_rq_stat	stat[2];

Can you add an enum or define for the directions? Just 0 and 1 aren't very
intuitive.

	Johannes
-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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