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>
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 8936761..7da2471 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3680,7 +3680,7 @@
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;
}