linux-kernel - Re: [RFC V4 1/6] blk: prepare to make blk-rq-qos pluggable and modular

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Message-ID: <YhUbCH+dhKkgMirE@slm.duckdns.org>
Date:   Tue, 22 Feb 2022 07:19:04 -1000
From:   Tejun Heo <tj@...nel.org>
To:     "Wang Jianchao (Kuaishou)" <jianchao.wan9@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Josef Bacik <jbacik@...com>,
        Bart Van Assche <bvanassche@....org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC V4 1/6] blk: prepare to make blk-rq-qos pluggable and
 modular

Hello,

On Thu, Feb 17, 2022 at 11:13:44AM +0800, Wang Jianchao (Kuaishou) wrote:
> (3) Add /sys/block/x/queue/qos
>     We can use '+name' or "-name" to open or close the blk-rq-qos
>     policy.

I don't understand why we're modularizing rq-qos in this non-standard way
instead of modprobing to enable a policy and rmmoding to disable. Why are we
building in qos names into the kernel and adding an extra module handling
interface?

Thanks.

-- 
tejun