From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: [PATCH 03 of 10 v2] xen: sched_credit: let the
 scheduler know about node-affinity
Date: Thu, 20 Dec 2012 09:33:31 +0100
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To: Juergen Gross <juergen.gross@ts.fujitsu.com>
Cc: Marcus Granado <Marcus.Granado@eu.citrix.com>, Dan Magenheimer <dan.magenheimer@oracle.com>, Ian Campbell <Ian.Campbell@citrix.com>, Anil Madhavapeddy <anil@recoil.org>, George Dunlap <George.Dunlap@eu.citrix.com>, Andrew Cooper <Andrew.Cooper3@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Jan Beulich <JBeulich@suse.com>, Daniel De Graaf <dgdegra@tycho.nsa.gov>, Matt Wilson <msw@amazon.com>
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On Thu, 2012-12-20 at 08:25 +0000, Juergen Gross wrote:=20
> > BTW, can you be a little bit more specific about where you're suggestin=
g
> > to put it? I'm sorry but I'm not sure I figured what you mean by "the
> > scheduler private per-pcpu area"... Do you perhaps mean making it a
> > member of `struct csched_pcpu' ?
>=20
> Yes, that's what I would suggest.
>=20
Ok then, functionally, that is going to be exactly the same thing as
where it is right now, i.e., a set of global per_cpu() variables. It is
possible for your solution to bring some cache/locality benefits,
although that will very much depends on single cases, architecture,
workload, etc.

That being said, I'm definitely fine with it and can go for it.

It was Jan that suggested/asked to pull them out of the stack, and I
guess it's George's taste that we value most when hacking sched_*.c, so
let's see if they want to comment on this and then I'll decide. :-)

Thanks and Regards,
Dario

--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)



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