linux-kernel - Re: [PATCH -next 3/6] blk-wbt: don't enable wbt for bio based device

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Date:   Fri, 12 May 2023 15:06:07 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Christoph Hellwig <hch@....de>, Yu Kuai <yukuai1@...weicloud.com>
Cc:     tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com,
        yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next 3/6] blk-wbt: don't enable wbt for bio based device

Hi,

在 2023/05/11 23:21, Christoph Hellwig 写道:
> On Thu, May 11, 2023 at 09:45:06AM +0800, Yu Kuai wrote:
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> Because rq_qos only make sense for rq based device. Instead of fail
>> from sysfs configuration, make wbt sysfs dentry invisible directly.
> 
> This looks ok, bt I would be better to just have a separate attr
> group just for blk-mq based devices?
> 

Sounds good, I'll add a new attr_group that is only visible for rq based
device, I think following attr can be moved to this new group:

nr_requests,
rq_affinity,
scheduler,
wbt_lat_usec

Thanks,
Kuai