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Re: [Xen-devel] [PATCH] SEDF: avoid gathering vCPU-s on pCPU0

On 04/03/13 11:37, Jan Beulich wrote:
While you might argue that affinity changes ought to be done
in a "sensible" way, I think you still realize that there is behavior
here that one wouldn't be able to control without explicitly
adding an intermediate step when doing this for DomU-s. And
you should also keep in mind that there are certain things that
Dom0 needs to change its vCPU affinities for (pv-ops doesn't
do that, which is while certain things there just can't work);
this is how I noticed in the first place that the second half of
the fix is necessary.

Oh right -- so the problem is that when you *expand* the mask, you want the scheduler to take another look at where might be a good place to run the vcpu given the changed constraints.

It's probably not a bad idea to just extend that idea to all the schedulers really. It's not like we expect people to be changing the affinity masks hundreds of times a second.


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