linux-kernel - Re: cgroups(7): documenting cgroups v2 delegation

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Message-ID: <20180110221418.GF3460072@devbig577.frc2.facebook.com>
Date:   Wed, 10 Jan 2018 14:14:18 -0800
From:   Tejun Heo <tj@...nel.org>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     "Serge E. Hallyn" <serge@...lyn.com>,
        linux-man <linux-man@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>, cgroups@...r.kernel.org,
        Roman Gushchin <guro@...com>
Subject: Re: cgroups(7): documenting cgroups v2 delegation

Hello, Michael.

On Wed, Jan 10, 2018 at 11:01:11PM +0100, Michael Kerrisk (man-pages) wrote:
> >>>> Can you please confirm that it's only necessary to delegate this file
> >>>> if we are delegating a threaded subtree?
> >>>
> >>> Replied on the other thread.  The file isn't delegatable as far as I
> >>> can tell.
> >>
> >> So, following on from the discussion in the other thread, my
> >> question above still stands.
> > 
> > Oh, I frankly haven't thought about delegating a threaded subtree.
> 
> I'm still confused. cgroup-v2.txt documents the possibility. You
> wrote that text. We just had a conversation in another thread about the
> fact that cgroup.threads is delegatable. You must have thought at 
> least a little about this?

Oh, I'm probably mixing up two things.

1. When delegating, cgroup.threads should be delegated.  Doing that
   selectively doesn't achieve anything meaningful.

2. I haven't thought much about delegating a sub-protion of a threaded
   subtree.  Everything works the same way.  I just can't think of a
   use case.

Thanks.

-- 
tejun