linux-kernel - Re: [RFC PATCH v2 12/17] cgroup: Remove cgroup v2 no internal process constraint

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Message-ID: <20170524170527.GH24798@htj.duckdns.org>
Date:   Wed, 24 May 2017 13:05:27 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...com, pjt@...gle.com,
        luto@...capital.net, efault@....de
Subject: Re: [RFC PATCH v2 12/17] cgroup: Remove cgroup v2 no internal
 process constraint

Hello,

On Mon, May 22, 2017 at 12:56:08PM -0400, Waiman Long wrote:
> All controllers can use the special sub-directory if userland chooses to
> do so. The problem that I am trying to address in this patch is to allow
> more natural hierarchy that reflect a certain purpose, like the task
> classification done by systemd. Restricting tasks only to leaf nodes
> makes the hierarchy unnatural and probably difficult to manage.

I see but how is this different from userland just creating the leaf
cgroup?  I'm not sure what this actually enables in terms of what can
be achieved with cgroup.  I suppose we can argue that this is more
convenient but I'd like to keep the interface orthogonal as much as
reasonably possible.

Thanks.

-- 
tejun