On Wed, Jun 26, 2013 at 03:38:05PM +0100, Mel Gorman wrote:
> +static int
> +find_idlest_cpu_node(int this_cpu, int nid)
> +{
> + unsigned long load, min_load = ULONG_MAX;
> + int i, idlest_cpu = this_cpu;
> +
> + BUG_ON(cpu_to_node(this_cpu) == nid);
> +
> + for_each_cpu(i, cpumask_of_node(nid)) {
> + load = weighted_cpuload(i);
> +
> + if (load < min_load) {
> + struct task_struct *p;
> +
> + /* Do not preempt a task running on its preferred node
> */
> + struct rq *rq = cpu_rq(i);
> + local_irq_disable();
> + raw_spin_lock(&rq->lock);
raw_spin_lock_irq() ?
> + p = rq->curr;
> + if (p->numa_preferred_nid != nid) {
> + min_load = load;
> + idlest_cpu = i;
> + }
> + raw_spin_unlock(&rq->lock);
> + local_irq_disable();
> + }
> + }
> +
> + return idlest_cpu;
> +}
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