Messages in this thread | | | Date | Tue, 27 Oct 2009 15:36:26 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: Memory overcommit |
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On Tue, 27 Oct 2009 15:34:29 +0900 Minchan Kim <minchan.kim@gmail.com> wrote:
> On Tue, 27 Oct 2009 15:10:52 +0900 > KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote: > > > 2009/10/27 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>: > > > On Mon, 26 Oct 2009 17:16:14 +0100 > > > Vedran Furač <vedran.furac@gmail.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 ?....
Regards, -Kame
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