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Date: Thu, 6 Dec 2012 11:37:42 -0600
From: Bruno Wolff III <bruno@wolff.to>
Subject: Re: kswapd craziness in 3.7
Message-ID: <20121206173742.GA27297@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 21:01:33 -0600,
   Bruno Wolff III <bruno@wolff.to> wrote:
>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 am now at a bit over 2 and 1/2 days with kswapd having used 1 minute 
53 seconds of CPU time.

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