linux-kernel - Re: [PATCHv4 14/14] writeback: add new tracepoints

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Date:	Sat, 24 Jul 2010 09:01:10 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 14/14] writeback: add new tracepoints

On Fri, 2010-07-23 at 12:29 -0400, Christoph Hellwig wrote:
> On Fri, Jul 23, 2010 at 06:05:54PM +0300, Artem Bityutskiy wrote:
> > From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> > 
> > Add 2 new trace points to the periodic write-back wake up case, just like we do
> > in the 'bdi_queue_work()' function. Namely, introduce:
> > 
> > 1. trace_writeback_wakeup(bdi)
> > 2. trace_writeback_wakeup_nothread(bdi)
> > 
> > The first event is triggered every time we wake up a bdi thread to start
> > periodic background write-out. The second event is triggered only when the bdi
> > thread does not exist and should be created by the forker thread.
> > 
> > This patch was suggested by Dave Chinner <david@...morbit.com>
> 
> As mentioned before doing the wakeup just for the case where we
> really wake up the flusher thead is much better.  It's not 100%
> clear for bdi_queue_work as we queue the work in either case, but
> I'd prefer to fix that one up as well (not in your series anyway)

OK, I'll do it your way. Many thanks for review!

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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