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Date: Tue, 27 Oct 2009 15:55:26 +0900 From: Minchan Kim <minchan.kim@...il.com> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, vedran.furac@...il.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: Memory overcommit On Tue, Oct 27, 2009 at 3:36 PM, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote: > On Tue, 27 Oct 2009 15:34:29 +0900 > Minchan Kim <minchan.kim@...il.com> wrote: > >> On Tue, 27 Oct 2009 15:10:52 +0900 >> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote: >> >> > 2009/10/27 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>: >> > > On Mon, 26 Oct 2009 17:16:14 +0100 >> > > Vedran Furač <vedran.furac@...il.com> wrote: >> > >> > - Could you show me /var/log/dmesg and /var/log/messages at OOM ? >> > >> >> > >> It was catastrophe. :) X crashed (or killed) with all the programs, but >> > >> my little program was alive for 20 minutes (see timestamps). And for >> > >> that time computer was completely unusable. Couldn't even get the >> > >> console via ssh. Rally embarrassing for a modern OS to get destroyed by >> > >> a 5 lines of C run as an ordinary user. Luckily screen was still alive, >> > >> oomk usually kills it also. See for yourself: >> > >> >> > >> dmesg: http://pastebin.com/f3f83738a >> > >> messages: http://pastebin.com/f2091110a >> > >> >> > >> (CCing to lklm again... I just want people to see the logs.) >> > >> >> > > Thank you for reporting and your patience. It seems something strange >> > > that your KDE programs are killed. I agree. >> > > >> > > I attached a scirpt for checking oom_score of all exisiting process. >> > > (oom_score is a value used for selecting "bad" processs.") >> > > please run if you have time. >> > > >> > > This is a result of my own desktop(on virtual machine.) >> > > In this environ (Total memory is 1.6GBytes), mmap(1G) program is running. >> > > >> > > %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? >> > > Maybe the current code assumes "Tons of swap have been generated, already" if > oom-kill is invoked. Then, just using mm->anon_rss will not be correct. > > Hm, should we count # of swap entries reference from mm ?.... In Vedran case, he didn't use swap. So, Only considering vm is the problem. I think it would be better to consider both RSS + # of swap entries as Kosaki mentioned. > > Regards, > -Kame > > > -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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