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

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Message-ID: <1303421088.4025.52.camel@mulgrave.site>
Date:	Thu, 21 Apr 2011 16:24:48 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pekka Enberg <penberg@...nel.org>,
	Michal Hocko <mhocko@...e.cz>, 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, 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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