Message-ID: <475BEB9E.4070606@linux.vnet.ibm.com>
Date: Sun, 09 Dec 2007 18:50:30 +0530
From: Balbir Singh <balbir@linux.vnet.ibm.com>
Reply-To: balbir@linux.vnet.ibm.com
Organization: IBM
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To: Pavel Machek <pavel@ucw.cz>
CC: LKML <linux-kernel@vger.kernel.org>, linuxppc-dev@ozlabs.org,
       David Rientjes <rientjes@google.com>, Olof Johansson <olof@lixom.net>
Subject: Re: [PATCH] Fake NUMA emulation for PowerPC
References: <20071207211425.10223.91240.sendpatchset@balbir-laptop> <20071207212817.GA391@lixom.net> <4759BCA2.1020809@linux.vnet.ibm.com> <975B5B2B-C1F3-4021-9AE2-8873FFE1BDEC@kernel.crashing.org> <4759C548.6030304@linux.vnet.ibm.com> <alpine.DEB.0.9999.0712071508460.27689@chino.kir.corp.google.com> <475A1BEE.2050109@linux.vnet.ibm.com> <20071209131636.GF4381@ucw.cz>
In-Reply-To: <20071209131636.GF4381@ucw.cz>
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Pavel Machek wrote:
> On Sat 2007-12-08 09:52:06, Balbir Singh wrote:
>> David Rientjes wrote:
>>> On Sat, 8 Dec 2007, Balbir Singh wrote:
>>>
>>>> To be able to test the memory controller under NUMA, I use fake NUMA
>>>> nodes. x86-64 has a similar feature, the code I have here is the
>>>> simplest I could come up with for PowerPC.
>>>>
>>> Magnus Damm had patches from over a year ago that, I believe, made much of 
>>> the x86_64 fake NUMA code generic so that it could be extended for 
>>> architectures such as i386.  Perhaps he could resurrect those patches if 
>>> there is wider interest in such a tool.
>> That would be a very interesting patch, but what I have here is the
>> simplest patch and we could build on it incrementally. The interface is
>> non-standard but it does amazing things for 59 lines of code change.
> 
> Well, maybe it is amazing, but having non-standard interface is also
> wrong...
> 

I tend to agree with you, but in this case it's mostly debug
infrastructure that is architecture specific.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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