linux-kernel - Re: [PATCH RFC 0/5] powerpc:numa Add serial nid support

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Message-ID: <560B7E30.20702@linux.vnet.ibm.com>
Date:	Wed, 30 Sep 2015 11:46:16 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Denis Kirjanov <kda@...ux-powerpc.org>
CC:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
	nikunj@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	anton@...ba.org, grant.likely@...aro.org, cl@...ux.com,
	khandual@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
	gkurz@...ux.vnet.ibm.com
Subject: Re: [PATCH RFC 0/5] powerpc:numa Add serial nid support

On 09/30/2015 01:16 AM, Denis Kirjanov wrote:
> On 9/29/15, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> wrote:
>> On 09/28/2015 10:34 PM, Nishanth Aravamudan wrote:
>>> On 28.09.2015 [13:44:42 +0300], Denis Kirjanov wrote:
>>>> On 9/27/15, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> wrote:
>>>>> Problem description:
>>>>> Powerpc has sparse node numbering, i.e. on a 4 node system nodes are
>>>>> numbered (possibly) as 0,1,16,17. At a lower level, we map the chipid
>>>>> got from device tree is naturally mapped (directly) to nid.
>>>>
>>>> Interesting thing to play with, I'll try to test it on my POWER7 box,
>>>> but it doesn't have the OPAL layer :(
>>
>> Hi Denis,
>> Thanks for your interest. I have pushed the patches to
>>
>> https://github.com/ktraghavendra/linux/tree/serialnuma_v1 if it makes
>>    patches easy to grab.
>
> Thanks!
> One sad thing is that I can't test the actual node id mapping now
> since currently I have an access to machine with only one memory node
> :/ Can we fake it through qemu?
>

faking the sparse numa ids is possible with Nish's patch for qemu:

https://lists.gnu.org/archive/html/qemu-devel/2014-06/msg05826.html

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