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

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Message-ID: <AANLkTinW99M1FBp5gRA=+SsjUWSJBwByurqrsjXKgQ4=@mail.gmail.com>
Date:	Wed, 9 Mar 2011 15:13:34 -0800
From:	Paul Menage <menage@...gle.com>
To:	Eric B Munson <emunson@...bm.net>
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, 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
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