linux-kernel - Re: [PATCH 2/4] blk-mq-tag: remove bt_for

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Message-ID: <c9517c34-4481-cba3-99fc-5a287c299416@linux.dev>
Date:   Tue, 22 Aug 2023 10:27:47 +0800
From:   Chengming Zhou <chengming.zhou@...ux.dev>
To:     Bart Van Assche <bvanassche@....org>, axboe@...nel.dk,
        ming.lei@...hat.com, hch@....de
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhouchengming@...edance.com
Subject: Re: [PATCH 2/4] blk-mq-tag: remove bt_for_each()

On 2023/8/22 05:26, Bart Van Assche wrote:
> On 8/21/23 00:35, chengming.zhou@...ux.dev wrote:
>> 2. __blk_mq_tagset_busy_iter() has BT_TAG_ITER_STARTED flag set, so only
>>     started requests will be iterated, which should be more efficient.
> 
> The above motivation sounds wrong to me. The goal here should be not to
> change the behavior of blk_mq_queue_tag_busy_iter(). Although
> blk_mq_queue_tag_busy_iter() iterates over more requests than only started
> requests, apparently blk_mq_queue_tag_busy_iter() is only used to iterate
> over started requests (blk_mq_request_started()). Please mention this in
> the patch description.
> 

Ok, will do.

Thanks.