linux-kernel - Re: [patch 08/11 -mmotm] oom: invoke oom killer for __GFP

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Date:	Sun, 10 May 2009 17:24:09 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Nick Piggin <npiggin@...e.de>, Mel Gorman <mel@....ul.ie>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	San Mehat <san@...roid.com>, Arve Hjonnevag <arve@...roid.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 08/11 -mmotm] oom: invoke oom killer for __GFP_NOFAIL

On Mon, 11 May 2009, KOSAKI Motohiro wrote:

> > The oom killer must be invoked regardless of the order if the allocation
> > is __GFP_NOFAIL, otherwise it will loop forever when reclaim fails to
> > free some memory.
> 
> This is intensional behavior. plus you change very widely caller bahavior.
> if you don't have good test program, I nak this.
> 

What exactly are you objecting to?  You don't want the oom killer called 
for a __GFP_NOFAIL allocation above PAGE_ALLOC_COSTLY_ORDER that could not 
reclaim any memory and would prefer that it loop endlessly in the page 
allocator?  What's the purpose of that if the oom killer could free a very 
large memory hogging task?
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