linux-kernel - Re: kswapd craziness in 3.7

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Date:	Tue, 4 Dec 2012 21:01:33 -0600
From:	Bruno Wolff III <bruno@...ff.to>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Thorsten Leemhuis <fedora@...mhuis.info>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	George Spelvin <linux@...izon.com>,
	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	Tomas Racek <tracek@...hat.com>, Jan Kara <jack@...e.cz>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Josh Boyer <jwboyer@...il.com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Jiri Slaby <jslaby@...e.cz>,
	Zdenek Kabelac <zkabelac@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	John Ellson <john.ellson@...cast.net>
Subject: Re: kswapd craziness in 3.7

On Tue, Dec 04, 2012 at 16:42:10 -0500,
   Johannes Weiner <hannes@...xchg.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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