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Date:	Tue, 10 Nov 2009 19:27:40 -0800 (PST)
From:	David Rientjes <>
To:	KOSAKI Motohiro <>
cc:	KAMEZAWA Hiroyuki <>,
	Daisuke Nishimura <>,,,
	Andrew Morton <>,
	Christoph Lameter <>
Subject: Re: [BUGFIX][PATCH] oom-kill: fix NUMA consraint check with nodemask

On Wed, 11 Nov 2009, KOSAKI Motohiro wrote:

> Linux doesn't support 1K nodes. (and only SGI huge machine use 512 nodes)

I know for a fact that it does on x86 if you adjust CONFIG_NODES_SHIFT, 
I've booted kernels all the way back to 2.6.18 with 1K nodes.

> At least, NODEMASK_ALLOC should make more cleaner interface. current one
> and struct nodemask_scratch are pretty ugly.

I agree, I haven't been a fan of nodemask_scratch because I think its use 
case is pretty limited, but I do advocate using NODEMASK_ALLOC() when deep 
in the stack.  We've made sure that most of the mempolicy code does that 
where manipulating nodemasks is common in -mm.
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