linux-kernel - Re: [PATCH] cgroup: disable controllers at parse time

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Date:   Thu, 20 May 2021 12:30:18 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, shy828301@...il.com,
        junichi.nomura@....com, Andrew Morton <akpm@...ux-foundation.org>,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: disable controllers at parse time

On Wed, May 12, 2021 at 01:19:46PM -0700, Shakeel Butt wrote:
> This patch effectively reverts the commit a3e72739b7a7 ("cgroup: fix
> too early usage of static_branch_disable()"). The commit 6041186a3258
> ("init: initialize jump labels before command line option parsing") has
> moved the jump_label_init() before parse_args() which has made the
> commit a3e72739b7a7 unnecessary. On the other hand there are
> consequences of disabling the controllers later as there are subsystems
> doing the controller checks for different decisions. One such incident
> is reported [1] regarding the memory controller and its impact on memory
> reclaim code.
> 
> [1] https://lore.kernel.org/linux-mm/921e53f3-4b13-aab8-4a9e-e83ff15371e4@nec.com
> 
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> Reported-by: NOMURA JUNICHI(野村　淳一) <junichi.nomura@....com>

Applied to cgroup/for-5.13-fixes.

Thanks.

-- 
tejun