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Message-ID: <4AE72A0D.9070804@gmail.com> Date: Tue, 27 Oct 2009 18:12:45 +0100 From: Vedran Furač <vedran.furac@...il.com> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> CC: linux-mm@...ck.org, linux-kernel@...r.kernel.org, "kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>, hugh.dickins@...cali.co.uk, akpm@...ux-foundation.org, rientjes@...gle.com Subject: Re: Memory overcommit KAMEZAWA Hiroyuki wrote: > 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. No problem. I want this to be solved as much as you do. Actually, it is not strange, just a buggy algorithm. Run: % ps -T -eo pid,ppid,tid,vsz,command You'll see that ppid of a number of processes is kdeinit, gnome-session, fvwm or something else depending on what one is using. All of this processes are started automatically during startup or manually clicking on a menu item or by some keyboard shortcut. OOM algorithm just sums memory usage of all of them and adds that ot the parent. Just plain wrong. Also, it seems it's looking at VIRT instead of RES. > 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. 96890 21463 VirtualBox // OK 118615 11144 kded4 // WRONG 127455 11158 knotify4 // WRONG 132198 1 init // WRONG 133940 11151 ksmserver // WRONG 134109 11224 audacious2 // Audio player, maybe 145476 21503 VirtualBox // OK 174939 11322 icedove-bin // thunderbird, maybe 178015 11223 akregator // rss reader, maybe 201043 22672 krusader // WRONG 212609 11187 krunner // WRONG 256911 24252 test // culprit, malloced 1GB 1750371 11318 run-mozilla.sh // tiny, parent of firefox threads 2044902 11141 kdeinit4 // tiny, parent of most KDE apps > 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 Yes it is. Regards, Vedran -- 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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