Re: [PATCH RESEND v3 03/13] blk-mq: Relocate shared sbitmap resize in blk_mq_update_nr_requests()

[Hannes Reinecke]

On 9/13/21 5:12 PM, John Garry wrote:
> For shared sbitmap, if the call to blk_mq_tag_update_depth() was
> successful for any hctx when hctx->sched_tags is not set, then it would be
> successful for all (due to nature in which blk_mq_tag_update_depth()
> fails).
>
> As such, there is no need to call blk_mq_tag_resize_shared_sbitmap() for
> each hctx. So relocate the call until after the hctx iteration under the
> !q->elevator check, which is equivalent (to !hctx->sched_tags).
>
> Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
> Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
> ---
>   block/blk-mq.c | 12 +++++++-----
>   1 file changed, 7 insertions(+), 5 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke                Kernel Storage Architect
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