linux-kernel - Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters

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Date:	Mon, 21 Aug 2006 14:04:33 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
To:	Kirill Korotaev <dev@...ru>
Cc:	Rik van Riel <riel@...hat.com>, vatsa@...ibm.com,
	ckrm-tech@...ts.sourceforge.net, Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, hugh@...itas.com,
	Ingo Molnar <mingo@...e.hu>, devel@...nvz.org,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters

On Mon, 2006-08-21 at 14:55 +0400, Kirill Korotaev wrote:
<snip>

> >>If you have a single container controlling all the resources, then
> >>placing kjournald into CPU container would require setting
> >>it's memory limits etc. And kjournald will start to be accounted separately,
> > 
> > 
> > Not necessarily. You could just set the CPU shares of the group and
> > leave the other resources as don't care.
> don't care IMHO doesn't mean "accounted and limited as container X".
> it sounds like "no limits" for me.

Yes. But, it would provide the same functionality that you want (i.e
limit only CPU and no other resources).

> 
> >>while my intention is kjournald to be accounted as the host system.
> >>I only want to _guarentee_ some CPU to it.
> > I do not see any _guarantee_ support, only barrier(soft limit) and
> > limit. May be I overlooked. Can you tell me how guarantee is achieved
> > with UBC.
> we just provide additional parameters like oomguarpages, where barrier
> is a guarantee.

I take it that you are suggesting that the controller can use barrier as
guarantee.

I don't see how it will work. charge_beancounter() returns -ENOMEM even
when the group is over its barrier (when queried with strict ==
UB_BARRIER). 

I have to see the oomguarpatches patches for understanding this, I
suppose.
> 
> Kirill
-- 

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


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