Re: [Xen-devel] [PATCH 2/5] xen: credit2: never consider CPUs outside of our cpupool.

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Tue, 2017-01-24 at 13:35 +0100, Juergen Gross wrote:
> On 23/01/17 15:40, George Dunlap wrote:
> > 
> > Having a "cpupool-remove" operation that doesn't actually remove
> > the
> > cpu from the pool is a bit mad...
> 
> Logically it does remove the cpu from Pool-0. It is just that there
> is
> no other scheduler entity involved for doing so.
> 
Yes, it's removed from the pool, *but* it basically remains part of the
pool's scheduler, that's the issue.

As you say, there's no another scheduler to which we can attach it...
So, as of now, I see two options:
1) create such (dummy) scheduler;
2) go all the way down toward deallocating the scheduler related data 
   of the cpu (and reallocate them back when re-added).

BTW, Anshul also hit this problem while also doing some work on
Credit2, and told me he'd be giving some thinking to it, and try to
figure some ideas out (as soon as he'd be free of a couple of other
burdens :-D).

Let's see what he'll come up with. :-)

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

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