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

[Jens Axboe]

On Mon, 6 Dec 2021 20:49:47 +0800, 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.
> 
> [...]

Applied, thanks!

[1/3] blk-mq: Drop busy_iter_fn blk_mq_hw_ctx argument
      (no commit info)
[2/3] blk-mq: Delete busy_iter_fn
      (no commit info)
[3/3] blk-mq: Optimise blk_mq_queue_tag_busy_iter() for shared tags
      (no commit info)

Best regards,
-- 
Jens Axboe