Message-ID: <44D35F0B.5000801@sw.ru>
Date: Fri, 04 Aug 2006 18:51:55 +0400
From: Kirill Korotaev <dev@sw.ru>
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To: vatsa@in.ibm.com
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>, Andrew Morton <akpm@osdl.org>,
       mingo@elte.hu, nickpiggin@yahoo.com.au, sam@vilain.net,
       linux-kernel@vger.kernel.org, dev@openvz.org, efault@gmx.de,
       balbir@in.ibm.com, sekharan@us.ibm.com, nagar@watson.ibm.com,
       haveblue@us.ibm.com, pj@sgi.com
Subject: Re: [RFC, PATCH 0/5] Going forward with Resource Management - A cpu
 controller
References: <20060804050753.GD27194@in.ibm.com> <20060803223650.423f2e6a.akpm@osdl.org> <20060803224253.49068b98.akpm@osdl.org> <1154684950.23655.178.camel@localhost.localdomain> <20060804114109.GA28988@in.ibm.com>
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>>I think the risk is that OpenVZ has all the controls and resource
>>managers we need, while CKRM is still more research-ish. I find the
>>OpenVZ code much clearer, cleaner and complete at the moment, although
>>also much more conservative in its approach to solving problems.
> 
> 
> I think it would be nice to compare first the features provided by ckrm and 
> openvz at some point and agree upon the minimum common features we need to have 
> as we go forward. For instance I think Openvz assumes that tasks do
> not need to move between containers (task-groups), whereas ckrm provides this
> flexibility for workload management. This may have some effect on the 
> controller/interface design, no?
OpenVZ assumes that tasks can't move between task-groups for a single reason:
user shouldn't be able to escape from the container.
But this have no implication on the design/implementation.

BTW, do you see any practical use cases for tasks jumping between resource-containers?

Kirill

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