linux-kernel - Re: [PATH] cgroup: add cgroup_favordynmods= command-line option

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Message-ID: <664019c3-c4b1-6603-7a3d-f44a81737178@redhat.com>
Date:   Tue, 5 Sep 2023 15:03:48 -0400
From:   Waiman Long <longman@...hat.com>
To:     Luiz Capitulino <luizcap@...zon.com>, tj@...nel.org,
        lizefan.x@...edance.com, hannes@...xchg.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     lcapitulino@...il.com
Subject: Re: [PATH] cgroup: add cgroup_favordynmods= command-line option


On 9/5/23 14:59, Waiman Long wrote:
>
> On 9/5/23 13:03, Luiz Capitulino wrote:
>> On Thu, Aug 31, 2023 at 10:20:46AM -0400, Luiz Capitulino wrote:
>>> We have a need of using favordynmods with cgroup v1, which doesn't 
>>> support
>>> changing mount flags during remount. Enabling CONFIG_FAVOR_DYNMODS at
>>> build-time is not an option because we want to be able to selectively
>>> enable it for certain systems.
>>>
>>> This commit addresses this by introducing the cgroup_favordynmods=
>>> command-line option. This option works for both cgroup v1 and v2 and
>>> also allows for disabling favorynmods when the kernel built with
>>> CONFIG_FAVOR_DYNMODS=y.
>>>
>>> Signed-off-by: Luiz Capitulino <luizcap@...zon.com>
>> Hi,
>>
>> Would somebody take a look at this patch please?
>>
>> Thanks,
>>
>> - Luiz
>
> The patch looks good to me. I do have a minor comment that it may be 
> better to use the relatively new __ro_after_init qualifier instead of 
> __read_mostly.
>
With this patch, CGROUP_FAVOR_DYNMODS kconfig option will have no user. 
So this config option should be removed as well.

Cheers,
Longman