On Mon, Aug 29, 2016 at 12:53:30PM +0200, Christoph Hellwig wrote:
> +static int blk_mq_create_mq_map(struct blk_mq_tag_set *set,
> + const struct cpumask *affinity_mask)
> +{
> + int queue = -1, cpu = 0;
> +
> + set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids,
> + GFP_KERNEL, set->numa_node);
> + if (!set->mq_map)
> + return -ENOMEM;
> +
> + if (!affinity_mask)
> + return 0; /* map all cpus to queue 0 */
> +
> + /* If cpus are offline, map them to first hctx */
> + for_each_online_cpu(cpu) {
> + if (cpumask_test_cpu(cpu, affinity_mask))
> + queue++;
> + if (queue >= 0)
> + set->mq_map[cpu] = queue;
> + }
This can't be right. We have a single affinity mask for the entire
set, but what I think we want is an one affinity mask for each
nr_io_queues. The irq_create_affinity_mask should then create an array
of cpumasks based on nr_vecs..
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