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

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Date:	Tue, 24 May 2011 18:38:28 +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

(2011/05/24 18:20), Minchan Kim wrote:
> On Tue, May 24, 2011 at 6:09 PM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
>>>>> 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.
> 
> I am blind. Thanks for open my eyes, KOSAKI.

No. Your review is very cute. Thank you for attempting this!



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