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

[Wang Jianchao <jianchao.wan9@gmail.com>]

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