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SubjectRe: [PATCH] backing_dev: Fix hung task on sync
Hello, Jan.

On Wed, Feb 19, 2014 at 10:27:31AM +0100, Jan Kara wrote:
> You are the workqueue expert so you may know better ;) But the way I
> understand it is that queue_delayed_work() does nothing if the timer is
> already running. Since we queue flusher work to run either immediately or
> after dirty_writeback_interval we are safe to run queue_delayed_work()
> whenever we want it to run after dirty_writeback_interval and
> mod_delayed_work() whenever we want to run it immediately.

Ah, okay, so it's always mod on immediate and queue on delayed. Yeah,
that should work.

> But it's subtle and some interface where we could say queue delayed work
> after no later than X would be easier to grasp.

Yeah, I think it'd be better if we had something like
mod_delayed_work_if_later(). Hmm...

Thanks.

--
tejun


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