linux-kernel - Re: [PATCH] Documentation: cgroups: Add notes on removing PIDs from tasks and cgroups requiring setup

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Date:	Thu, 10 Mar 2011 11:59:12 -0500
From:	Eric B Munson <emunson@...bm.net>
To:	Paul Menage <menage@...gle.com>
Cc:	containers@...ts.linux-foundation.org, rdunlap@...otime.net,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation: cgroups: Add notes on removing PIDs
 from tasks and cgroups requiring setup

On Wed, 09 Mar 2011, Paul Menage wrote:

> On Wed, Mar 9, 2011 at 1:09 PM, Eric B Munson <emunson@...bm.net> wrote:
> >
> > +Note: To remove a task from a cgroup you must write its PID to the root
> > +tasks file.
> > +
> 
> This isn't really accurate - the root cgroup is a cgroup like all the
> others. More accurate would be something like:
> 
> Since every task is always a member of exactly one cgroup in each
> mounted hierarchy, to remove a task from its current cgroup you must
> move it into a new cgroup (possibly the root cgroup) by writing to the
> new cgroup's tasks file.
> 
> Paul
> 

I am going to lift that for V2.

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