linux-kernel - Re: [PATCH v2 0/3] blk-mq: Optimise blk_mq_queue_tag_busy

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Date:   Tue, 07 Dec 2021 09:18:02 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     John Garry <john.garry@...wei.com>
Cc:     linux-block@...r.kernel.org, kashyap.desai@...adcom.com,
        linux-kernel@...r.kernel.org, hare@...e.de, ming.lei@...hat.com
Subject: Re: [PATCH v2 0/3] blk-mq: Optimise blk_mq_queue_tag_busy_iter() for shared tags

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