From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Peter Zijlstra <peterz@infradead.org>
Subject: Re: FYI: mmap_sem OOM patch
Cc: kosaki.motohiro@jp.fujitsu.com, Michel Lespinasse <walken@google.com>,
       linux-mm <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
       Divyesh Shah <dpshah@google.com>, Ingo Molnar <mingo@elte.hu>
In-Reply-To: <1278588200.1900.89.camel@laptop>
References: <20100708200324.CD4B.A69D9226@jp.fujitsu.com> <1278588200.1900.89.camel@laptop>
Message-Id: <20100709102430.CD65.A69D9226@jp.fujitsu.com>
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Date: Fri,  9 Jul 2010 10:31:21 +0900 (JST)
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> On Thu, 2010-07-08 at 20:06 +0900, KOSAKI Motohiro wrote:
> > > [ small note on that we really should kill __GFP_NOFAIL, its utter
> > > deadlock potential ]
> > 
> > I disagree. __GFP_NOFAIL mean this allocation failure can makes really
> > dangerous result. Instead, OOM-Killer should try to kill next process.
> > I think. 
> 
> Say _what_?! you think NOFAIL is a sane thing? 

insane obviously ;)
but as far as my experience, some embedded system prefer to use NOFAIL.
So, I don't like to make big hammer crash. NOFAIL killing need long year
rather than you expected, I guess.


> Pretty much everybody has
> been agreeing for years that the thing should die.

I'm not against this at all. but until it die, it should works correctly.


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