linux-kernel - Re: Memory overcommit

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Date:	Tue, 27 Oct 2009 15:56:59 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	vedran.furac@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: Memory overcommit

On Tue, 27 Oct 2009 15:46:36 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > > > %check_badness.pl | sort -n | tail
> > > > --
> > > > 89924   3938    mixer_applet2
> > > > 90210   3942    tomboy
> > > > 94753   3936    clock-applet
> > > > 101994  3919    pulseaudio
> > > > 113525  4028    gnome-terminal
> > > > 127340  1       init
> > > > 128177  3871    nautilus
> > > > 151003  11515   bash
> > > > 256944  11653   mmap
> > > > 425561  3829    gnome-session
> > > > --
> > > > Sigh, gnome-session has twice value of mmap(1G).
> > > > Of course, gnome-session only uses 6M bytes of anon.
> > > > I wonder this is because gnome-session has many children..but need to
> > > > dig more. Does anyone has idea ?
> > > > (CCed kosaki)
> > > 
> > > Following output address the issue.
> > > The fact is, modern desktop application linked pretty many library. it
> > > makes bloat VSS size and increase
> > > OOM score.
> > > 
> > > Ideally, We shouldn't account evictable file-backed mappings for oom_score.
> > > 
> > Hmm. 
> > I wonder why we consider VM size for OOM kiling. 
> > How about RSS size?
> 
> Because, swap out-ed bad body (e.g. fork bomb process) still should
> be killed by oom.
> RSS + swap-entries is acceptable to me.

It's reasonable to me.
As I mentioned by reply of kame, in Vedran case, he didn't use swap. 
I think only considering vm is the problem.

-- 
Kind regards,
Minchan Kim
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