linux-kernel - Re: Kernel 2.6.29 runs out of memory and hangs.

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Date:	Mon, 27 Apr 2009 14:03:39 +0200
From:	Zeno Davatz <zdavatz@...il.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-kernel@...r.kernel.org, Hannes Wyss <hwyss@...see.com>
Subject: Re: Kernel 2.6.29 runs out of memory and hangs.

Dear David

Thanks for all your help and input. It was very helpful ans useful.

On Mon, Apr 27, 2009 at 10:53 AM, Zeno Davatz <zdavatz@...il.com> wrote:
> On Mon, Apr 27, 2009 at 10:32 AM, David Rientjes <rientjes@...gle.com> wrote:
>
>> All allowable zones have minimum watermarks that define how much memory
>> an oom killed task may use so that it can quickly exit.  This is the
>> purpose of the TIF_MEMDIE flag in the kernel.
>
> Thanks for the info.
>
>> The policy is better defined in userspace to determine what memory-hogging
>> task should be killed in low memory situations.  Users can already tune
>> the /proc/pid/oom_adj score of any task so that the oom killer can prefer
>> it over other tasks (see Documentation/filesystems/proc.txt).  For low
>> memory situations, however, userspace can act in any number of ways to
>> prevent reaching an oom condition.
>
> This may be off-Topic, but: Can I assign a PID to a process at
> startup? Say Apache always should have PID 2755, or Ruby should always
> have PID 1003. Otherwise how would I set the score for a PID at
> Kernel-Boop-Up?

Ok, we solved this issue, with the following commit:

http://scm.ywesee.com/?p=oddb.org;a=blobdiff;f=bin/oddbd;h=655b4c235594159d3fe4290696ecc54580188c7c;hp=9cb744b4affe30beee935a495223015d9ce090ce;hb=6d38f6839f746bcf2dc701528e343170af8f47be;hpb=a8b4f8c43200a0035df9f5002a5ea9ec8133e99e

Best
Zeno
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