linux-kernel - Re: [PATH v3] cgroup: add cgroup_favordynmods= command-line option

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Message-ID: <hegunkr2yuuhxvqevza5qthqnhv66dmru2c2elfk3rl7rwycl5@levqk6gto7e5>
Date:   Wed, 27 Sep 2023 11:27:39 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Luiz Capitulino <luizcap@...zon.com>
Cc:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        longman@...hat.com, kamalesh.babulal@...cle.com,
        lcapitulino@...il.com
Subject: Re: [PATH v3] cgroup: add cgroup_favordynmods= command-line option

On Tue, Sep 26, 2023 at 09:16:17PM +0000, Luiz Capitulino <luizcap@...zon.com> wrote:
> We have a need of using favordynmods with cgroup v1, which doesn't support
> changing mount flags during remount. Enabling CONFIG_CGROUP_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_CGROUP_FAVOR_DYNMODS=y.
> 
> Also, note that when cgroup_favordynmods=true favordynmods is never
> disabled in cgroup_destroy_root().
> 
> Signed-off-by: Luiz Capitulino <luizcap@...zon.com>
> ---
>  .../admin-guide/kernel-parameters.txt          |  4 ++++
>  kernel/cgroup/cgroup.c                         | 18 ++++++++++++++----
>  2 files changed, 18 insertions(+), 4 deletions(-)

Thanks,

Reviewed-by: Michal Koutný <mkoutny@...e.com>


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