linux-kernel - Re: [PATCH 11/16] blk-mq: improve plug list sorting

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Message-ID: <eff592b4-df3b-d4df-261c-30acb77ffcf0@suse.de>
Date:   Thu, 1 Nov 2018 10:30:39 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/16] blk-mq: improve plug list sorting

On 10/30/18 7:32 PM, Jens Axboe wrote:
> Currently we only look at the software queue, but with support
> for multiple maps, we should also look at the hardware queue.
> This is important since we'll flush out the request list if
> either the software queue or hardware queue don't match.
> 
> This sorts by software queue first, then hardware queue if
> that differs. Finally we sort by request location like before.
> This minimizes the flush points per plug list.
> 
> Signed-off-by: Jens Axboe <axboe@...nel.dk>
> ---
>   block/blk-mq.c | 17 ++++++++++++-----
>   1 file changed, 12 insertions(+), 5 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes