linux-kernel - Re: [PATCH] Fake NUMA emulation for PowerPC

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Message-ID: <alpine.DEB.0.9999.0712072040300.26622@chino.kir.corp.google.com>
Date:	Fri, 7 Dec 2007 20:45:21 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	linuxppc-dev@...abs.org, Nathan Lynch <ntl@...ox.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fake NUMA emulation for PowerPC

On Sat, 8 Dec 2007, Balbir Singh wrote:

> > You're going to want to distribute the cpu's based on how they match up 
> > physically with the actual platform that you're running on.  x86_64 does 
> 
> Could you explain this better, how does it match up CPU's with fake NUMA
> memory? Is there some smartness there? I'll try and look at the code and
> also see what I can do for PowerPC
> 

numa_cpumask_lookup_table[] would return the correct cpumask for the fake 
node index.  Then all the code that uses node_to_cpumask() in generic 
kernel code like the scheduler and VM still preserve their true NUMA 
affinity that matches the underlying hardware.  I tried to make x86_64 
fake NUMA as close to the real thing as possible.

You also probably want to make all you changes dependent on 
CONFIG_NUMA_EMU like the x86_64 case.  That'll probably be helpful as you 
extend this tool more and more.

		David
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