linux-kernel - Re: [PATCH RFC v2 5/6] blk-throttle: support to destroy throtl

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Message-ID: <1bb85208-1224-77dc-f0b2-7b7a228ef70b@huaweicloud.com>
Date: Sat, 13 Apr 2024 10:06:00 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Tejun Heo <tj@...nel.org>, Yu Kuai <yukuai1@...weicloud.com>
Cc: axboe@...nel.dk, chenhuacai@...nel.org, josef@...icpanda.com,
 jhs@...atatu.com, svenjoac@....de, raven@...maw.net, pctammela@...atatu.com,
 qde@...cy.de, zhaotianrui@...ngson.cn, linux-block@...r.kernel.org,
 linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
 cgroups@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RFC v2 5/6] blk-throttle: support to destroy throtl_data
 when blk-throttle is disabled

Hi,

在 2024/04/13 2:05, Tejun Heo 写道:
> Hello,
> 
> On Sat, Apr 06, 2024 at 04:00:58PM +0800, Yu Kuai wrote:
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> Currently once blk-throttle is enabled, it can't be destroyed until disk
>> removal, even it's disabled.
>>
>> Also prepare to support building it as kernel module.
> 
> The benefit of doing this whenever the ruleset becomes empty seems marginal.
> This isn't necessary to allow unloading blk-throttle and
> blkg_conf_exit_blkg() is also necessary because of this, right?

Yes, this is why blkg_conf_exit_blkg() is necessary.

I think that we need find an appropriate time to unload blk-throttle
other than deleting the gendisk. I also think of adding a new user input
like "8:0 free" to do this. These are the solutions that I can think of
for now.

Thanks,
Kuai

> 
> Thanks.
>