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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.11.13 at 17:56, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> On 11/05/2013 03:39 PM, George Dunlap wrote:
>> A potential problem with that is the "auto domain numa" thing.  In this
>> patch, if the domain numa affinity is not set but vcpu numa affinity is,
>> the domain numa affinity (which will be used to allocate memory for the
>> domain) will be set based on the vcpu numa affinity.  That seems like a
>> useful feature (though perhaps it's starting to violate the "policy
>> should be in the tools" principle).  If we change this to just "hard
>> affinity" and "soft affinity", we'll lose the natural logical connection
>> there.  It might have impacts on how we end up doing vNUMA as well.  So
>> I'm a bit torn ATM.
> 
> [Coming back after going through the whole series]
> 
> This is basically the main architectural question that needs to be 
> sorted out with the series: Do we bake in that the "soft affinity" is 
> specifically for NUMA-ness, or not?

I think that it would be beneficial if we could keep the soft
affinity as a more abstract construct than just representing
NUMAness, even if that means that domain node affinity
won't be able to be fully "automated" anymore. But I'm
saying that without having a specific use case in mind.

Jan


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