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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: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Joonsoo Kim 2012-08-15 23:25:41 +09:00 committed by Tejun Heo
parent e2b6a6d570
commit 7635d2fd7f
1 changed files with 1 additions and 1 deletions
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kernel/workqueue.c
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@ -3680,7 +3680,7 @@ static int __devinit workqueue_cpu_down_callback(struct notifier_block *nfb,
case CPU_DOWN_PREPARE: case CPU_DOWN_PREPARE:
/* unbinding should happen on the local CPU */ /* unbinding should happen on the local CPU */
INIT_WORK_ONSTACK(&unbind_work, gcwq_unbind_fn); 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); flush_work(&unbind_work);
break; break;
} }