linux-kernel - Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

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Message-Id: <1156149773.21411.58.camel@localhost>
Date:	Mon, 21 Aug 2006 17:42:53 +0900
From:	Magnus Damm <magnus@...inux.co.jp>
To:	Andi Kleen <ak@...e.de>
Cc:	Christoph@...-sf-spam2.sourceforge.net,
	Rik van Riel <riel@...hat.com>,
	Linux@...-sf-spam2.sourceforge.net,
	ckrm-tech@...ts.sourceforge.net, Dave Hansen <haveblue@...ibm.com>,
	List <linux-kernel@...r.kernel.org>, Kirill Korotaev <dev@...ru>,
	Hellwig <hch@...radead.org>, Andrey Savochkin <saw@...ru>,
	devel@...nvz.org, rohitseth@...gle.com, hugh@...itas.com,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface)

On Mon, 2006-08-21 at 09:48 +0200, Andi Kleen wrote:
> > You may be looking for the NUMA emulation patches posted here:
> > 
> > http://marc.theaimsgroup.com/?l=linux-mm&m=112806587501884&w=2
> > 
> > There is a slightly updated x86_64 version here too:
> > 
> > http://marc.theaimsgroup.com/?l=linux-mm&m=113161386520342&w=2
> 
> Hmm, I must have missed that version. Seems like a improvement. Best you
> resubmit it, although I'll probably only take it after the .19 merge

No problem. The second URL pointed to a x86_64 version where I tried to
break out code to make some kind of generic NUMA emulation layer. At
that time no one seemed interested in that strategy as a simple resource
control solution so I gave that up.

For x86_64 I think it's only worth mucking around with the code if
people believe that it is the right way to go for in-kernel resource
control.

The x86_64 patches above include code to divide each real NUMA node into
several smaller emulated nodes, but that is kind of pointless if people
only use it for non-resource control purposes, ie just to play with
CPUSETS and NUMA on non-NUMA hardware. For simple purposes like that I
think the existing NUMA emulation code for x86_64 works perfectly well.

I still think that i386 users would benefit from NUMA emulation though.
If you want me to up-port the i386-specific code just let me know.

Thanks,

/ magnus

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