From mboxrd@z Thu Jan  1 00:00:00 1970
From: Juergen Gross <juergen.gross@ts.fujitsu.com>
Subject: Re: [PATCH 03 of 10 v2] xen: sched_credit: let the
 scheduler know about node-affinity
Date: Thu, 20 Dec 2012 09:39:39 +0100
Message-ID: <50D2CECB.4030108@ts.fujitsu.com>
References: <patchbomb.1355944036@Solace>	<06d2f322a6319d8ba212.1355944039@Solace>	<50D2B3DE.70206@ts.fujitsu.com>	<1355991370.28419.15.camel@Abyss>
	<50D2CB96.4030509@ts.fujitsu.com> <1355992411.28419.25.camel@Abyss>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <1355992411.28419.25.camel@Abyss>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Dario Faggioli <dario.faggioli@citrix.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>
List-Id: xen-devel@lists.xenproject.org

Am 20.12.2012 09:33, schrieb Dario Faggioli:
> On Thu, 2012-12-20 at 08:25 +0000, Juergen Gross wrote:
>>> BTW, can you be a little bit more specific about where you're suggesting
>>> 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' ?
>>
>> Yes, that's what I would suggest.
>>
> 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.

The space is only allocated if sched_credit is responsible for the pcpu.


Juergen

-- 
Juergen Gross                 Principal Developer Operating Systems
PBG PDG ES&S SWE OS6                   Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@ts.fujitsu.com
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html