linux-kernel - Re: [patch 3/3 -mmotm] oom: invoke oom killer for __GFP

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Message-ID: <84144f020906012341k42530236x823c8393b5e65502@mail.gmail.com>
Date:	Tue, 2 Jun 2009 09:41:56 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, 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>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3 -mmotm] oom: invoke oom killer for __GFP_NOFAIL

Hi Nick,

On Mon, Jun 01, 2009 at 10:56:02PM -0700, Andrew Morton wrote:
>> Do we know of any callsites which do greater-than-order-0 allocations
>> with GFP_NOFAIL?  If so, we should fix them.

On Tue, Jun 2, 2009 at 9:27 AM, Nick Piggin <npiggin@...e.de> wrote:
> Yeah, we have GFP_NOFAIL going to the slab allocator, so all bets are
> off in regard to the order.

SLUB is supports variable order allocations so we can certainly do
GFP_NOFAIL special casing there for < PAGE_SIZE allocations to enforce
zero order allocation for those. I suspect we could do something
similar in SLQB too?

                        Pekka
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