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

[Johannes Thumshirn]

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@xxxxxx>
> ---

[...]

>  
>  	/* 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
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Johannes Thumshirn                                          Storage
jthumshirn@xxxxxxx                                +49 911 74053 689
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