Re: [RFC][PATCH 3/8] sched: update the cpu_power sum duringload-balance

From: Peter Zijlstra
Date: Wed Sep 02 2009 - 07:25:29 EST

On Wed, 2009-09-02 at 16:47 +0530, Gautham R Shenoy wrote:
> > + if (local_group) {
> > balance_cpu = group_first_cpu(group);
> > + if (balance_cpu == this_cpu)
> > + update_sched_power(sd);
> > + }
> I guess the intention of this check is to ensure that the cpu_power for
> the group of sd is updated only by a specific member of the group and
> that would ideally be the first member of the group.
> Thus, this check has more to do with this_cpu being the
> group_first_cpu() than this_cpu being the balance_cpu. Correct ?

Right, so the load-balancer walks the sd tree in the fashion that only
the first cpu of the domain goes up a level. So I made that cpu also
aggregate the new cpu-power.

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