linux-kernel - Re: [PATCH 15/16] x86: Unify node_to_cpumask

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Message-ID: <alpine.DEB.2.00.1012301040420.12207@chino.kir.corp.google.com>
Date:	Thu, 30 Dec 2010 10:43:33 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Tejun Heo <tj@...nel.org>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	tglx@...utronix.de, "H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org, eric.dumazet@...il.com, yinghai@...nel.org,
	brgerst@...il.com, gorcunov@...il.com,
	Pekka Enberg <penberg@...nel.org>, shaohui.zheng@...el.com
Subject: Re: [PATCH 15/16] x86: Unify node_to_cpumask_map handling between
 32 and 64bit

On Thu, 30 Dec 2010, Tejun Heo wrote:

> Sigh, the new NUMA emulation thing is 64bit only. :-( I'll see if it
> can be applied to 32bit too.  BTW, how does this interact with the
> Shaohui's patchset.  Isn't that about NUMA emulation too?  Are these
> the same patches?
> 

There's nothing new about NUMA emulation on x86_64, it's existed for well 
over four years (we've been using it at Google since 2.6.18, see 
Documentation/x86/x86_64/fake-numa-for-cpusets).  Shaohui's patches are 
completely seperate and add hotplug emulation.  You _could_ boot with a 
very minimal amount of memory and then hotplug all the emulated nodes like 
numa=fake does, but you may find it difficult to parse the e820 and 
interleave the nodes appropriately over the set of physical nodes in 
userspace.
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