linux-kernel - Re: 3.4-rc4 oom killer out of control.

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Message-ID: <alpine.DEB.2.00.1204261517100.28376@chino.kir.corp.google.com>
Date:	Thu, 26 Apr 2012 15:20:34 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Jones <davej@...hat.com>, linux-mm@...ck.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.4-rc4 oom killer out of control.

On Thu, 26 Apr 2012, Dave Jones wrote:

> /sys/kernel/mm/ksm/full_scans is increasing constantly
> 
> full_scans: 146370
> pages_shared: 1
> pages_sharing: 4
> pages_to_scan: 1250
> pages_unshared: 867
> pages_volatile: 1
> run: 1
> sleep_millisecs: 20
> 

full_scans is just a counter of how many times it has scanned mergable 
memory so it should be increasing constantly.  Whether pages_to_scan == 
1250 and sleep_millisecs == 20 is good for your system is unknown.  You 
may want to try disabling ksm entirely (echo 0 > /sys/kernel/mm/ksm/run) 
to see if it significantly increases responsiveness for your workload.
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