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Re: [Xen-devel] RFC: Still TODO for 4.2? xl domain numa memory allocation vs xm/xend


  • To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
  • From: Dario Faggioli <raistlin@xxxxxxxx>
  • Date: Fri, 20 Jan 2012 17:58:43 +0100
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Keir \(Xen.org\)" <keir@xxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, "Tim \(Xen.org\)" <tim@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
  • Delivery-date: Fri, 20 Jan 2012 16:59:03 +0000
  • Face: 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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On Fri, 2012-01-20 at 16:21 +0000, Ian Campbell wrote: 
> I think I made the rather basic c*ckup of using a domain configured with
> more memory than is in any single node.
> 
Well, that is one of the most interesting use cases, indeed! :-)

Seriously, I really expect to have some very hard time when I'll come to
consider scenarios like that one...

> With your affinity patches and the domain restricted to a single node
> via cpu affinity The Right Thing seems to happen.
> 
> cpupools don't seem to do this, I don't know if that is expected or not.
> 
Glad to know my patches are (well, could be!) useful for something!
About cpupool, I think if a domain is created as part of the pool, the
very same behaviour you achieve with my patches should be expected.
However, as George is correctly pointing out, that might turn out to be
quite bad if the domain is then moved! :-(

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-------------------------------------------------------------------
Dario Faggioli, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
PhD Candidate, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa (Italy)


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