linux-kernel - Re: [PATCH 01/16] slab: correct pfmemalloc check

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Message-ID: <000001410d6dd2ea-858fd952-3568-44e9-ac6a-070810b732d0-000000@email.amazonses.com>
Date:	Wed, 11 Sep 2013 14:30:03 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH 01/16] slab: correct pfmemalloc check

On Thu, 22 Aug 2013, Joonsoo Kim wrote:

> And, therefore we should check pfmemalloc in page flag of first page,
> but current implementation don't do that. virt_to_head_page(obj) just
> return 'struct page' of that object, not one of first page, since the SLAB
> don't use __GFP_COMP when CONFIG_MMU. To get 'struct page' of first page,
> we first get a slab and try to get it via virt_to_head_page(slab->s_mem).

Maybe using __GFP_COMP would make it consistent across all allocators and
avoid the issue? We then do only have to set the flags on the first page.
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