linux-kernel - Re: [RFC V2 0/6] blk: make blk-rq-qos policies pluggable and modular

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Message-ID: <44f86e8d-45f4-f40e-bc8b-00aa4f488f3a@nvidia.com>
Date:   Tue, 15 Feb 2022 13:01:06 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     "Wang Jianchao (Kuaishou)" <jianchao.wan9@...il.com>
CC:     "hch@...radead.org" <hch@...radead.org>,
        Josef Bacik <jbacik@...com>, Tejun Heo <tj@...nel.org>,
        Bart Van Assche <bvanassche@....org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [RFC V2 0/6] blk: make blk-rq-qos policies pluggable and modular

Wang Jianchao (Kuaishou),

On 2/15/22 04:36, Wang Jianchao (Kuaishou) wrote:
> Hi Jens
> 
> blk-rq-qos is a standalone framework out of io-sched and can be used to
> control or observe the IO progress in block-layer with hooks. blk-rq-qos
> is a great design but right now, it is totally fixed and built-in and shut
> out peoples who want to use it with external module.
> 
> This patchset attempts to make blk-rq-qos framework pluggable and modular.
> Then we can update the blk-rq-qos policy module w/o stopping the IO workload.
> And it is more convenient to introduce new policy on old machines w/o udgrade
> kernel. And we can close all of the blk-rq-qos policy if we needn't any of
> them. At the moment, the request_queue.rqos list is empty, we needn't to
> waste cpu cyles on them.
> 
>

Please write tests in blktests [1] to cover the code that we are
changing in this commit.

-ck

[1] https://github.com/osandov/blktests