From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [RFC][PATCH 01/16] writeback: do not self-wakeup
Date: Sun, 18 Jul 2010 02:44:35 -0400
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Cc: Jens Axboe <axboe@kernel.dk>, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
To: Artem Bityutskiy <dedekind1@gmail.com>
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On Fri, Jul 16, 2010 at 03:44:57PM +0300, Artem Bityutskiy wrote:
> From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
> 
> The bdi forker thread wakes up itself via 'bdi_add_to_pending()'.
> And the thread is the only user of 'bdi_add_to_pending()'. Thus,
> we can safely zap the unneeded 'wake_up_process()' call.

At least right now it's called using call_rcu, which offloads the function
to a RCU thread of some sorts.