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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>
Lai Jiangshan 11 năm trước cách đây
mục cha
commit
ed1403ec2b
1 tập tin đã thay đổi với 1 bổ sung1 xóa
  1. 1 1
      kernel/kthread.c

+ 1 - 1
kernel/kthread.c

@@ -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);
 }