Date: Thu, 24 Apr 2014 13:59:10 +0200
From: Marc Dietrich <marvin24@gmx.de>
To: jaegeuk.kim@samsung.com
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: f2fs causes system stall
Message-Id: <20140424135910.f095d63eafdf136cc8851114@gmx.de>
In-Reply-To: <1398297270.4283.19.camel@kjgkr>
References: <2601952.jk1l5iHOJT@ax5200p>
	<1398297270.4283.19.camel@kjgkr>
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Sender: linux-kernel-owner@vger.kernel.org

Hi,

On Thu, 24 Apr 2014 08:54:30 +0900
Jaegeuk Kim <jaegeuk.kim@samsung.com> wrote:
> Thank you for the report.
> When I veiwed the patch at a glance, it seems that reverting is not a
> good way.
> 
> Instead, could you share the f2fs commit point that you're using?
> Then, since I have a suspect for this issue, I'd like to write a patch
> to test.

patch against linus master is ok for me. I'm happy to test your patch.

> 2014-04-24 (목), 00:00 +0200, Marc Dietrich:
> > Hi,
> > 
> > it took me a while to bisect a problem which causes my ARM (tegra2) netbook to 
> > frequently stall for 5-10 seconds when I enable EXA acceleration (opentegra 
> > experimental ddx). I can only guess that the offending commit 8618b88 "f2fs: 
> > fix not to write data pages on the page reclaiming path" somehow causes high 
> > kernel latencies which may interrupt/disturb the command stream to the gpu in 
> > this particular case. Reverting this commit fixes the problem. Any hints?

Regards,

Marc
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