linux-kernel - Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory)

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Date:	Tue, 12 Sep 2006 17:02:12 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
To:	rohitseth@...gle.com
Cc:	vatsa@...ibm.com, Rik van Riel <riel@...hat.com>,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>, balbir@...ibm.com,
	Dave Hansen <haveblue@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Matt Helsley <matthltc@...ibm.com>,
	Hugh Dickins <hugh@...itas.com>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Kirill Korotaev <dev@...ru>, Oleg Nesterov <oleg@...sign.ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4)
	(added	user	memory)

On Tue, 2006-09-12 at 10:22 -0700, Rohit Seth wrote:
> On Tue, 2006-09-12 at 16:14 +0530, Srivatsa Vaddagiri wrote:
> > On Mon, Sep 11, 2006 at 12:10:31PM -0700, Rohit Seth wrote:
> > > It seems that a single notion of limit should suffice, and that limit
> > > should more be treated as something beyond which that resource
> > > consumption in the container will be throttled/not_allowed.
> > 
> > The big question is : are containers/RG allowed to use *upto* their
> > limit always? In other words, will you typically setup limits such that
> > sum of all limits = max resource capacity? 
> > 
> 
> If a user is really interested in ensuring that all scheduled jobs (or
> containers) get what they have asked for (guarantees) then making the
> sum of all container limits equal to total system limit is the right
> thing to do.
> 
> > If it is setup like that, then what you are considering as limit is
> > actually guar no?
> > 
> Right.  And if we do it like this then it is up to sysadmin to configure
> the thing right without adding additional logic in kernel.

It won't be a complete solution, as the user won't be able to
 - set both guarantee and limit for a resource group
 - use limit on some and guarantee on some
 - optimize the usage of available resources 
> 
> -rohit
> 
> 
> 
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-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@...ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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