Re: [PATCH v2 0/3] blk-mq: Optimise blk_mq_queue_tag_busy_iter() for shared tags

[Jens Axboe]

On 12/6/21 5:49 AM, John Garry wrote:
> In [0] Kashyap reports high CPU usage for blk_mq_queue_tag_busy_iter()
> and callees for shared tags.
> 
> Indeed blk_mq_queue_tag_busy_iter() would be less optimum for moving to
> shared tags, but it was not optimum previously.
> 
> This series optimises by having only a single iter (per regular and resv
> tags) for the shared tags, instead of an iter per HW queue.
> 
> [0] https://lore.kernel.org/linux-block/e4e92abbe9d52bcba6b8cc6c91c442cc@xxxxxxxxxxxxxx/

The patch(es) are missing Fixes tags.

-- 
Jens Axboe