linux-kernel - Re: [PATCH] oom_kill: use rss value instead of vm size for badness

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Date:	Mon, 2 Nov 2009 21:35:35 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>, vedran.furac@...il.com
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH] oom_kill: use rss value instead of vm size for badness

>> Hi David,
>>
>> I'm very interesting your pointing out. thanks good testing.
>> So, I'd like to clarify your point a bit.
>>
>> following are badness list on my desktop environment (x86_64 6GB mem).
>> it show Xorg have pretty small badness score. Do you know why such
>> different happen?
>
> I don't know specifically what's different on your machine than Vedran's,
> my data is simply a collection of the /proc/sys/vm/oom_dump_tasks output
> from Vedran's oom log.
>
> I guess we could add a call to badness() for the oom_dump_tasks tasklist
> dump to get a clearer picture so we know the score for each thread group
> leader.  Anything else would be speculation at this point, though.
>
>> score    pid        comm
>> ==============================
>> 56382   3241    run-mozilla.sh
>> 23345   3289    run-mozilla.sh
>> 21461   3050    gnome-do
>> 20079   2867    gnome-session
>> 14016   3258    firefox
>> 9212    3306    firefox
>> 8468    3115    gnome-do
>> 6902    3325    emacs
>> 6783    3212    tomboy
>> 4865    2968    python
>> 4861    2948    nautilus
>> 4221    1       init
>> (snip about 100line)
>> 548     2590    Xorg
>>
>
> Are these scores with your rss patch or without?  If it's without the
> patch, this is understandable since Xorg didn't appear highly in Vedran's
> log either.

Oh, I'm sorry. I mesured with rss patch.
Then, I haven't understand what makes Xorg bad score.

Hmm...
Vedran,  Can you please post following command result?

# cat /proc/`pidof Xorg`/smaps


I hope to undestand the issue clearly before modify any code.
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