Re: [Xen-devel] [PATCH RESEND 05/12] xen: numa-sched: make space for per-vcpu node-affinity

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On mar, 2013-11-05 at 17:30 +0000, Jan Beulich wrote:
> >>> On 05.11.13 at 18:16, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> > This would mean the toolstack either assuming, when someone calls 
> > vcpu_set_node_affinity, that soft_affinity == numa_affinity, or keeping 
> > its own copy of numa_affinity for each vcpu around somewhere.
> 
> Question is how reasonable it is for the tool stack to keep such
> information around and up-to-date, in particular considering
> node/CPU/memory hotplug.
>
Right. Well, I may be wrong, and I won't know until I'll actually try
coding it (first thing in the morning), but I honestly don't think there
will be much to keep around at the toolstack level.

>  If that's reasonable, then your
> proposal below seems to be the right one architecturally, i.e.
> keeping policy entirely at the tools level.
> 
Agreed.

Thanks and Regards,
Dario

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

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