Re: [RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter

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To: "Wang Jianchao (Kuaishou)" <jianchao.wan9@xxxxxxxxx>
Subject: Re: [RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 24 Feb 2022 05:38:01 -0800
Cc: Jens Axboe <axboe@xxxxxxxxx>, Josef Bacik <jbacik@xxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Bart Van Assche <bvanassche@xxxxxxx>, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20220224090654.54671-2-jianchao.wan9@gmail.com>
References: <20220224090654.54671-1-jianchao.wan9@gmail.com> <20220224090654.54671-2-jianchao.wan9@gmail.com>

On Thu, Feb 24, 2022 at 05:06:39PM +0800, Wang Jianchao (Kuaishou) wrote:
> This is to protect the rqos list against the rqos open/close. We
> need to drain all of the caller of blk_mq_submit_bio() before
> we can operate the rqos list.

This means ever I/O now has to d an extra refcount roundtrip.

Follow-Ups:
- Re: [RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter
  - From: Wang Jianchao

References:
- [RFC V5 0/16] blk: blk-rq-qos framework refactor and cleanup
  - From: Wang Jianchao (Kuaishou)
- [RFC V5 01/16] blk: make the whole blk_mq_submit_bio under q_usage_counter
  - From: Wang Jianchao (Kuaishou)

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