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Date: Tue, 4 Dec 2012 21:01:33 -0600
From: Bruno Wolff III <bruno@wolff.to>
Subject: Re: kswapd craziness in 3.7
Message-ID: <20121205030133.GA17438@wolff.to>
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Thorsten Leemhuis <fedora@leemhuis.info>, Mel Gorman <mgorman@suse.de>, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, Rik van Riel <riel@redhat.com>, George Spelvin <linux@horizon.com>, Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>, Tomas Racek <tracek@redhat.com>, Jan Kara <jack@suse.cz>, Dave Hansen <dave@linux.vnet.ibm.com>, Josh Boyer <jwboyer@gmail.com>, Valdis Kletnieks <Valdis.Kletnieks@vt.edu>, Jiri Slaby <jslaby@suse.cz>, Zdenek Kabelac <zkabelac@redhat.com>, linux-mm <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, John Ellson <john.ellson@comcast.net>

On Tue, Dec 04, 2012 at 16:42:10 -0500,
   Johannes Weiner <hannes@cmpxchg.org> wrote:
>  kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.i686
>and
>  kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.x86_64
>for over 24hours with no evidence of problems with kswapd"
>
>Now waiting for results from Jiri, Zdenek and Bruno...

I have been running 3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.i686.PAE 
a bit over 23 hours and kswapd has accumalated one minute 8 seconds of 
CPU time. I did several yum operations during that time and didn't see 
kswapd spike to 90+% CPU usage as I had seen in the past. With some kernels 
I wasn't reliably triggering the kswapd issue, so it may not be long enough 
to know for sure that the problem is fixed.

I also should note that when I tried 3.7.0-0.rc7.git3.2.fc19.i686.PAE I 
did see problems with kswapd hitting 90+% usage of a CPU.

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