Re: [Hackathon minutes] PV frontends/backends and NUMA machines

From: Dario Faggioli <dario.faggioli@citrix.com>
To: George Dunlap <dunlapg@umich.edu>
Cc: andre.przywara@calxeda.com,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	Matt Wilson <msw@amazon.com>,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: [Hackathon minutes] PV frontends/backends and NUMA machines
Date: Tue, 21 May 2013 13:10:57 +0200	[thread overview]
Message-ID: <1369134657.12423.63.camel@Solace> (raw)
In-Reply-To: <CAFLBxZbonzEwo4mF6PTSq6WQjU2haN_Ray-Z_3Td83i=f7zsbA@mail.gmail.com>

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On lun, 2013-05-20 at 14:48 +0100, George Dunlap wrote:
> So the work items I remember are as follows:
>
Thanks for sending this out.

> 1. Implement NUMA affinity for vcpus
> 2. Implement Guest NUMA support for PV guests
> 3. Teach Xen how to make a sensible NUMA allocation layout for dom0
> 4. Teach the toolstack to pin the netback threads to dom0 vcpus
> running on the correct node (s)
> 
> Dario will do #1.  I volunteered to take a stab at #2 and #3.
>
I've got half backed patches for #1 already, I'm sure I can submit them
as soon as 4.4 window opens.

Regarding #2 and #3, here they are the old patches (and other material)
that I've been able to find so far on the subject.

For HVM, the patches are originally from Andre (and I think they are the
ones Matt is going to refresh and try to upstream):
 - July 2008: http://lists.xen.org/archives/html/xen-devel/2008-07/msg00582.html
 - February 2010: http://old-list-archives.xen.org/archives/html/xen-devel/2010-02/msg00279.html

For PV, the patches are originally from Dulloor Rao, they come with a
lot of policing and cover a lot o stuff that are upstream now, but there
perhaps still are some useful bits:
 - April 2010: http://lists.xen.org/archives/html/xen-devel/2010-04/msg00103.html
 - August 2010: http://lists.xen.org/archives/html/xen-devel/2010-08/msg00008.html

The work on PV-NUMA appears to have been presented at a XenSummit,
together by Dulloor and Jun from Intel, and there hence are slides and a
video available:
 http://www.slideshare.net/xen_com_mgr/dulloor-xensummit#btnNext
 http://www.slideshare.net/xen_com_mgr/nakajima-numafinal
 http://vimeo.com/12295753

Personally, I'm still quite buried under that memory migration thing, so
I really appreciate you stepping up for this. That being said, I should
be able to help, especially considering I used to be familiar with the
Linux side of this (although, years have passed, and my forgetting rate
is really high! :-P).

Regards,
Dario

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