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SubjectRe: [PATCH RFC] cpumask: Randomly distribute the tasks within affinity mask
Hey Peter,

> +static struct cpumask *root_domain_allowed(struct cpumask *newmask,
> + struct cpumask *scratch,
> + struct cpumask *valid)
> +{
> + struct root_domain *rd;
> + struct cpumask *mask;
> + struct rq *rq;
> +
> + int first = cpumask_first_and(newmask, valid);
> + if (first >= nr_cpu_ids)
> + return NULL;

This picks the first arbitrarily, but isn't it possible for the mask
to span both isolated and non-isolated cpus? In which case, the rest
of this just boils down to chance (ie. whatever the span happens to be
for the first cpu here)?

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