Commit f3de44ed authored Oct 31, 2012 by Sankara Muthukrishnan Committed by Thomas Gleixner Nov 01, 2012

irq: Set CPU affinity right on thread creation



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 right 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@ni.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/CAFQPvXeVZ858WFYimEU5uvLNxLDd6bJMmqWihFmbCf3ntokz0A@mail.gmail.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 293a7a0a

kernel/irq/manage.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -849,6 +849,8 @@ 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;

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