diff options
| -rw-r--r-- | kernel/workqueue.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 56814902bc56..d51c37dd9422 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -920,6 +920,16 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task) * CONTEXT: * spin_lock_irq(rq->lock) * + * This function is called during schedule() when a kworker is going + * to sleep. It's used by psi to identify aggregation workers during + * dequeuing, to allow periodic aggregation to shut-off when that + * worker is the last task in the system or cgroup to go to sleep. + * + * As this function doesn't involve any workqueue-related locking, it + * only returns stable values when called from inside the scheduler's + * queuing and dequeuing paths, when @task, which must be a kworker, + * is guaranteed to not be processing any works. + * * Return: * The last work function %current executed as a worker, NULL if it * hasn't executed any work yet. |