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