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Commit 7635d2fd authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Tejun Heo
Browse files

workqueue: use system_highpri_wq for unbind_work 



To speed cpu down processing up, use system_highpri_wq.
As scheduling priority of workers on it is higher than system_wq and
it is not contended by other normal works on this cpu, work on it
is processed faster than system_wq.

tj: CPU up/downs care quite a bit about latency these days.  This
    shouldn't hurt anything and makes sense.

Signed-off-by: default avatarJoonsoo Kim <js1304@gmail.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent e2b6a6d5

kernel/workqueue.c

+1 −1
Original line number Diff line number Diff line
@@ -3680,7 +3680,7 @@ static int __devinit workqueue_cpu_down_callback(struct notifier_block *nfb, 
	case CPU_DOWN_PREPARE:

		/* unbinding should happen on the local CPU */

		INIT_WORK_ONSTACK(&unbind_work, gcwq_unbind_fn);

		schedule_work_on(cpu, &unbind_work);

		queue_work_on(cpu, system_highpri_wq, &unbind_work);

		flush_work(&unbind_work);

		break;

	}