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

[Hannes Reinecke]

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@xxxxxxxxx>
> ---
>   block/blk-mq.c | 17 ++++++++++++-----
>   1 file changed, 12 insertions(+), 5 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>

Cheers,

Hannes