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

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Date:   Wed, 16 Feb 2022 09:43:49 +0800
From:   Wang Jianchao <jianchao.wan9@...il.com>
To:     Chaitanya Kulkarni <chaitanyak@...dia.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



On 2022/2/15 9:01 下午, Chaitanya Kulkarni wrote:
> 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
> 

Yes, I will send out next

Thanks
Jianchao