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 09:44:59 -0500
From:	Mike Heffner <mike@...rato.com>
To:	Paul Menage <menage@...gle.com>
CC:	Eric B Munson <emunson@...bm.net>, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, rdunlap@...otime.net,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH] Documentation: cgroups: Add notes on removing PIDs from
 tasks and cgroups requiring setup

On 03/09/2011 06:13 PM, 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.


If we are updating this documentation, can we include a blurb that 
mentions if the 'ns' cgroup is mounted in the hierarchy, moving a 
process to a new cgroup can fail?


Mike

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