Re: Re: [PATCH] [RFC] Credit2 scheduler prototype

[Keir Fraser <keir.fraser@eu.citrix.com>]

On 13/01/2010 14:48, "George Dunlap" <George.Dunlap@eu.citrix.com> wrote:

> The first implements something like what you suggest below, but
> instead of using a sort of "hack" with VPF_migrate, it makes a proper
> "context_saved" SCHED_OP callback.

I thought using the vcpu_migrate() path might work well since you presumably
have logic there to pick a new cpu which is relatively unloaded, making the
cpu which tried to schedule the vcpu but had to idle instead a prime
candidate. So rather than having to implement a new callback hook, you'd get
to leverage the pick_cpu hook for free?

> The second addresses the fact that when sharing runqueues,
> v->processor may change quickly without an explicit migrate.

I can't think of a better solution for this one.

 -- Keir