linux-kernel - Re: [Patch 01/05]- Containers: Documentation on using containers

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Message-ID: <20060915174412.GB5285@atjola.homenet>
Date:	Fri, 15 Sep 2006 19:44:12 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Rohit Seth <rohitseth@...gle.com>
Cc:	Rolf Eike Beer <eike-kernel@...tec.de>,
	Andrew Morton <akpm@...l.org>, devel@...nvz.org,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Patch 01/05]- Containers: Documentation on using containers

On 2006.09.15 09:45:25 -0700, Rohit Seth wrote:
> On Fri, 2006-09-15 at 08:15 +0200, Rolf Eike Beer wrote:
> > Rohit Seth wrote:
> > > This patch contains the Documentation for using containers.
> > 
> > > +5- Remove a task from container
> > > +	echo <pid> rmtask
> > 
> > echo <pid> > rmtask?
> > 
> 
> rmtask is an attribute defined in test_container directory.  So, first
> you have to cd into container directory
> (cd /mnt/configfs/containers/test_container and then execute this
> command)

The > is missing in the patch though, guess that's what Rolf wanted to
point out ;)

> 
> > Please also give a short description what containers are for. From what I read 
> > here I can only guess it's about gettings some statistics about a group of 
> > tasks.
> 
> Containers allow different workloads to be run on the same platform with
> limits defined on per container basis.  This basically allows a single
> platform to be (soft) partitioned among different workloads (each of
> which could be running many tasks).  The limits could be amount of
> memory, number of tasks among other features.  These two features are
> already implemented in the patch set that I posted.  But it is possible
> to add other controllers like CPU that allows only finite amount of time
> to the processes belonging to a container.
> 
> Currently this patch set is only tracking user memory (both file based
> and anonymous).  The memory handler is currently deactivating pages
> belonging to a container that has gone over the limit. Even though this
> allows containers to go over board their limits but 1- once they are
> over the limit then they run in degraded manner and 2- if there is any
> memory pressure then the (extra) pages belonging to this container are
> the prime candidates for swapping (for example).  The statistics that
> are shown in each container directory are the current values of each
> resource consumption.
> 
> Please let me know if you need any more specific information about the
> patch set.

A general description for the containers needs to go into Documentation/
along with the usage example, so that potential users know what to do
with it. The above seems fine, just remove the "this patch" references.

Björn
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