Commit ed1403ec authored Jul 26, 2014 by Lai Jiangshan Committed by Tejun Heo Jul 28, 2014

kthread_work: wake up worker only when the worker is idle



If the worker is already executing a work item when another is queued,
we can safely skip wakeup without worrying about stalling queue thus
avoiding waking up the busy worker spuriously.  Spurious wakeups
should be fine but still isn't nice and avoiding it is trivial here.

tj: Updated description.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

parent ddcb57e2

kernel/kthread.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -591,7 +591,7 @@ static void insert_kthread_work(struct kthread_worker *worker,

		list_add_tail(&work->node, pos);
		work->worker = worker;
		if (likely(worker->task))
		if (!worker->current_work && likely(worker->task))
		wake_up_process(worker->task);
		}

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