linux-kernel - Re: Memory overcommit

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Date:	Thu, 29 Oct 2009 01:35:43 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	vedran.furac@...il.com
cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	minchan.kim@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: Memory overcommit

On Thu, 29 Oct 2009, Vedran Furac wrote:

> > We would know if you posted the data.
> 
> I need to find some free time to destroy a session on a computer which I
> use for work. You could easily test it yourself also as this doesn't
> happen only to me.
> 
> Anyways, here it is... this time it started with ntpd:
> 
> http://pastebin.com/f3f9674a0
> 

That oom log shows 12 ooms but no tasks actually appear to be getting 
killed (there're no "Killed process 1234 (task)" found).  Do you have any 
idea why?

Anyway, as I posted in response to KAMEZAWA-san's patch, the change to 
get_mm_rss(mm) prefers Xorg more than the current implementation.

>From your log at the link above:

total_vm
669624 test
195695 krunner
187342 krusader
168881 plasma-desktop
130562 ktorrent
127081 knotify4
125881 icedove-bin
123036 akregator

rss
668738 test
42191 Xorg
30761 firefox-bin
13331 icedove-bin
10234 ktorrent
9263 akregator
8864 plasma-desktop
7532 krunner

Can you explain why Xorg is preferred as a baseline to kill rather than 
krunner in your example?

Thanks.
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