Re: [patch] sched: fix SMT scheduler regression infind_busiest_queue()

[Peter Zijlstra]

On Tue, 2010-02-16 at 23:55 +0530, Vaidyanathan Srinivasan wrote:
> The sched_domain will be rebuilt with the sched_group_cpus()
> representing only online siblings right?  sched_group_cpus(group) will
> always be a subset of cpu_active_mask.  Can please explain your
> comment. 

__build_*_sched_domain() seems to only rebuild the sd->span, not the
sched_group's mask, cpu_to_*_group() only picks an existing group based
on the cpumask passed in, it doesn't change sg->cpumask afaict.

That is also the reason we drag load_balance_tmpmask all through
load_balance() afaict.




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