linux-kernel - Re: kswapd craziness in 3.7

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Message-ID: <20121206173742.GA27297@wolff.to>
Date:	Thu, 6 Dec 2012 11:37:42 -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 21:01:33 -0600,
   Bruno Wolff III <bruno@...ff.to> wrote:
>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 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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