From: Sankara S Muthukrishnan <sankara.m@xxxxxx> As irq_thread_check_affinity is called ONLY inside the while loop in the irq thread, the core affinity is set only when an interrupt occurs. This patch sets the core affinity soon after the irq thread is created and before it waits for interrupts. In real-tiime targets that do not typically change the core affinity of irqs during run-time, this patch will save additional latency of an irq thread in setting the core affinity during the first interrupt occurrence for that irq. Signed-off-by: Sankara S Muthukrishnan <sankara.m@xxxxxx> Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx> --- Hi Thomas, As we discussed in the original thread http://marc.info/?l=linux-kernel&m=134987001701683&w=2 , I am sending this patch against the current mainline. kernel/irq/manage.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 4c69326..020b535 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -833,6 +833,8 @@ static int irq_thread(void *data) init_task_work(&on_exit_work, irq_thread_dtor); task_work_add(current, &on_exit_work, false); + irq_thread_check_affinity(desc, action); + while (!irq_wait_for_interrupt(action)) { irqreturn_t action_ret; -- 1.7.11.4 -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
