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SubjectRe: [PATCH 0/3] fix interrupt swamp in NVMe
On Tue, Aug 20, 2019 at 01:59:32AM -0700, John Garry wrote:
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index e8f7f179bf77..cb483a055512 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -966,9 +966,13 @@ irq_thread_check_affinity(struct irq_desc *desc,
> struct irqaction *action)
> * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
> */
> if (cpumask_available(desc->irq_common_data.affinity)) {
> + struct irq_data *irq_data = &desc->irq_data;
> const struct cpumask *m;
>
> - m = irq_data_get_effective_affinity_mask(&desc->irq_data);
> + if (action->flags & IRQF_IRQ_AFFINITY)
> + m = desc->irq_common_data.affinity;
> + else
> + m = irq_data_get_effective_affinity_mask(irq_data);
> cpumask_copy(mask, m);
> } else {
> valid = false;
> --
> 2.17.1
>
> As Ming mentioned in that same thread, we could even make this policy
> for managed interrupts.

Ack, I really like this option!

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