On Mon, Sep 21, 2015 at 03:03:44PM +0200, Petr Mladek wrote:
> flush_kthread_worker() returns when the currently queued works are proceed.
^
processed?
> But some other works might have been queued in the meantime.
...
> +/**
> + * drain_kthread_worker - drain a kthread worker
> + * @worker: worker to be drained
> + *
> + * Wait until there is none work queued for the given kthread worker.
^
no
> + * Only currently running work on @worker can queue further work items
^^^^^^^^^
should be queueing is prolly more accurate
> + * on it. @worker is flushed repeatedly until it becomes empty.
> + * The number of flushing is determined by the depth of chaining
> + * and should be relatively short. Whine if it takes too long.
> + *
> + * The caller is responsible for blocking all existing works
> + * from an infinite re-queuing!
The caller is responsible for preventing the existing work items from
requeueing themselves indefinitely.
> + *
> + * Also the caller is responsible for blocking all the kthread
> + * worker users from queuing any new work. It is especially
> + * important if the queue has to stay empty once this function
> + * finishes.
The last sentence reads a bit weird to me. New work items just aren't
allowed while draining. It isn't "especially important" for certain
cases. It's just buggy otherwise.
Thanks.
--
tejun
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