linux-kernel - Re: [PATCH] cgroup: fix attach task fail when subtree

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Message-ID: <YlB20sw1e998Dant@slm.duckdns.org>
Date:   Fri, 8 Apr 2022 07:54:26 -1000
From:   Tejun Heo <tj@...nel.org>
To:     "zhaoyang.huang" <zhaoyang.huang@...soc.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Zhaoyang Huang <huangzhaoyang@...il.com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        ke.wang@...soc.com
Subject: Re: [PATCH] cgroup: fix attach task fail when subtree_control
 configured

On Fri, Apr 08, 2022 at 06:23:14PM +0800, zhaoyang.huang wrote:
> From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
> 
> It is found that task attach to a vacant cgroup will fail when its
> subtree_control has been configured. Fix it by judging if there is no chrildren
> existed.
> 
> Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...soc.com>

If I'm not misunderstanding, that's the intended behavior. Can you please
take a look at Documentation/admin-guide/cgroup-v2.rst and confirm what
you're trying to do?

Thanks.

-- 
tejun