linux-kernel - Re: [PATCH 0/4] forkbomb killer

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Date:	Thu, 14 Apr 2011 09:57:42 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Michel Lespinasse <walken@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	Andrey Vagin <avagin@...nvz.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0/4] forkbomb killer

Hi, KOSAKI and Kame.

On Thu, Apr 14, 2011 at 9:35 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Thu, 14 Apr 2011 09:20:41 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
>
>> Hi, Minchan, Kamezawa-san,
>>
>> > >> So whenever user push sysrq, older tasks would be killed and at last,
>> > >> root forkbomb task would be killed.
>> > >>
>> > >
>> > > Maybe good for a single user system and it can send Sysrq.
>> > > But I myself not very excited with this new feature becasuse I need to
>> > > run to push Sysrq ....
>> > >
>> > > Please do as you like, I think the idea itself is interesting.
>> > > But I love some automatic ones. I do other jobs.
>> >
>> > Okay. Thanks for the comment, Kame.
>> >
>> > I hope Andrew or someone gives feedback forkbomb problem itself before
>> > diving into this.
>>
>> May I ask current status of this thread? I'm unhappy if our kernel keep
>> to have forkbomb weakness. ;)
>
> I've stopped updating but can restart at any time. (And I found a bug ;)
>
>> Can we consider to take either or both idea?
>>
> I think yes, both idea can be used.
> One idea is
>  - kill all recent threads by Sysrq. The user can use Sysrq multiple times
>   until forkbomb stops.
> Another(mine) is
>  - kill all problematic in automatic. This adds some tracking costs but
>   can be configurable.
>
> Thanks,
> -Kame
>
>

Unfortunately, we didn't have a slot to discuss the oom and forkbomb.
So, personally, I talked it with some guys(who we know very well :) )
for a moment during lunch time at LSF/MM. It seems he doesn't feel
strongly we really need it and still I am not sure it, either.

Now most important thing is to listen other's opinions about we really
need it and  we need it in kernel.

And I have a idea to implement my one in automatic, too.  :)

Thanks for your interest.

-- 
Kind regards,
Minchan Kim
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