linux-kernel - Re: [RFC V4 4/6] blk-iocost: make iocost pluggable

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Date:   Fri, 18 Feb 2022 11:43:23 +0800
From:   Wang Jianchao <jianchao.wan9@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jens Axboe <axboe@...nel.dk>, Josef Bacik <jbacik@...com>,
        Tejun Heo <tj@...nel.org>,
        Bart Van Assche <bvanassche@....org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC V4 4/6] blk-iocost: make iocost pluggable



On 2022/2/17 4:52 下午, Christoph Hellwig wrote:
> On Thu, Feb 17, 2022 at 11:13:47AM +0800, Wang Jianchao (Kuaishou) wrote:
>> Make blk-iocost pluggable. Then we can close or open it through
>> /sys/block/xxx/queue/qos.
>>
>> Signed-off-by: Wang Jianchao (Kuaishou) <jianchao.wan9@...il.com>
>> ---
>>  block/blk-iocost.c     | 52 ++++++++++++++++++++++++++----------------
>>  block/blk-mq-debugfs.c |  2 --
>>  block/blk-rq-qos.h     |  1 -
>>  3 files changed, 32 insertions(+), 23 deletions(-)
>>
>> diff --git a/block/blk-iocost.c b/block/blk-iocost.c
>> index 769b64394298..5a3a45985b49 100644
>> --- a/block/blk-iocost.c
>> +++ b/block/blk-iocost.c
>> @@ -660,9 +660,10 @@ static struct ioc *rqos_to_ioc(struct rq_qos *rqos)
>>  	return container_of(rqos, struct ioc, rqos);
>>  }
>>  
>> +static struct rq_qos_ops ioc_rqos_ops;
>>  static struct ioc *q_to_ioc(struct request_queue *q)
>>  {
>> -	return rqos_to_ioc(rq_qos_id(q, RQ_QOS_COST));
>> +	return rqos_to_ioc(rq_qos_by_id(q, ioc_rqos_ops.id));
>>  }
> 
> This has a single caller, so just open code it.
> 
>> +static int blk_iocost_init(struct request_queue *q);
>> +
>>  static struct rq_qos_ops ioc_rqos_ops = {
>> +	.name = "blk-iocost",
>> +	.flags = RQOS_FLAG_CGRP_POL,
>>  	.throttle = ioc_rqos_throttle,
>>  	.merge = ioc_rqos_merge,
>>  	.done_bio = ioc_rqos_done_bio,
>>  	.done = ioc_rqos_done,
>>  	.queue_depth_changed = ioc_rqos_queue_depth_changed,
>>  	.exit = ioc_rqos_exit,
>> +	.init = blk_iocost_init,
>>  };
> 
> Again, move rq_qos_ops below the init function to avoid the forward
> declaration.

Got it

Thanks
Jianchao