linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Date:	Thu, 21 Apr 2011 15:02:42 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Pekka Enberg <penberg@...nel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards

On Thu, 21 Apr 2011, David Rientjes wrote:

> I think we may want to just convert slub (and the memory controller) to
> use N_HIGH_MEMORY rather than N_NORMAL_MEMORY since nothing else uses it
> and the generic code seems to handle N_HIGH_MEMORY for all configs
> appropriately.

In 32 bit configurations some architectures (like x86) provide nodes
that have only high memory. Slab allocators only handle normal memory.
SLAB operates in a kind of degraded mode in that case by falling back for
each allocation to the nodes that have normal memory.

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