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

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Date:	Thu, 14 Sep 2006 16:13:23 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
To:	rohitseth@...gle.com
Cc:	Rik van Riel <riel@...hat.com>, Srivatsa <vatsa@...ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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>,
	Matt Helsley <matthltc@...ibm.com>,
	Hugh Dickins <hugh@...itas.com>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Kirill Korotaev <dev@...ru>, Oleg Nesterov <oleg@...sign.ru>,
	devel@...nvz.org, Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [PATCH] BC:
	resource	beancounters	(v4)	(added	user	memory)

On Wed, 2006-09-13 at 18:22 -0700, Rohit Seth wrote:
<snip>
> > 
> > Here are results of some of the benchmarks we have run in the past
> > (April 2005) with CKRM which showed no/negligible performance impact in
> > that scenario.
> > http://marc.theaimsgroup.com/?l=ckrm-tech&m=111325064322305&w=2
> > http://marc.theaimsgroup.com/?l=ckrm-tech&m=111385973226267&w=2
> > http://marc.theaimsgroup.com/?l=ckrm-tech&m=111291409731929&w=2
> > > 
> 
> 
> These are good results.  But I still think the cost will increase over a
> period of time as more logic gets added.  Any data on microbenchmarks

IMO, overhead may not increase for a _non-user_ of the feature.

> like lmbench.

I think we have run those, but I could not find the results in the
mailing list.
>  
> > <snip>
> > 
> > > > Not at all. If the container they are interested in is guaranteed, I do
> > > > not see how apps running outside a container would affect them.
> > > > 
> > > 
> > > Because the kernel (outside the container subsystem) doesn't know of
> > 
> > The core resource subsystem (VM subsystem for memory) would know about
> > the guarantees and don't cares, and it would handle it appropriately.
> > 
> 
> ...meaning hooks in the generic kernel reclaim algorithm.  Getting
> something like that in mainline will be at best tricky.

Yes, it does mean doing something in the reclamation path.

> 
> 
> -rohit
> 
-- 

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


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