Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Pekka Enberg <penberg@kernel.org>, Michal Hocko <mhocko@suse.cz>,
        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>
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Date: Thu, 21 Apr 2011 16:24:48 -0500
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On Thu, 2011-04-21 at 14:19 -0700, David Rientjes wrote:
> On Thu, 21 Apr 2011, Christoph Lameter wrote:
> 
> > 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.
> > 
> 
> Let's do this:
> 
>  - parisc: James has already queued "parisc: set memory ranges in 
>    N_NORMAL_MEMORY when onlined" for 2.6.39, so all he needs now is 
>    to merge a hybrid of the Kconfig changes requiring CONFIG_NUMA for 
>    CONFIG_DISCONTIGMEM from KOSAKI-san and myself which also fix the 
>    compile issues,

Not quite: if we go this route, we need to sort out our CPU scheduling
problem as well ... as I said, I don't think we've got all the necessary
numa machinery in place yet.

James


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