linux-kernel - Re: [PATCH 4/5] oom: don't kill random process

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Date:	Tue, 24 May 2011 18:09:44 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	minchan.kim@...il.com
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, caiqian@...hat.com, rientjes@...gle.com,
	hughd@...gle.com, kamezawa.hiroyu@...fujitsu.com, oleg@...hat.com
Subject: Re: [PATCH 4/5] oom: don't kill random process

>>> Hmm, If I understand your code correctly, unprivileged process can get
>>> a score 1 by 3% bonus.
>>
>> 3% bonus is for privileged process. :)
> 
> OMG. Typo.
> Anyway, my point is following as.
> If chose_point is 1, it means root bonus is rather big. Right?
> If is is, your patch does second loop with completely ignore of bonus
> for root privileged process.
> My point is that let's not ignore bonus completely. Instead of it,
> let's recalculate 1.5% for example.

1) unpriviledged process can't get score 1 (because at least a process need one
   anon, one file and two or more ptes).
2) then, score=1 mean all processes in the system are privileged. thus decay won't help.

IOW, never happen privileged and unprivileged score in this case.


> 
> But I don't insist on my idea.
> Thanks.


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