From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <kniht@linux.vnet.ibm.com>
Received: from e2.ny.us.ibm.com (e2.ny.us.ibm.com [32.97.182.142])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(Client CN "e2.ny.us.ibm.com", Issuer "Equifax" (verified OK))
	by ozlabs.org (Postfix) with ESMTPS id 623E8DDF39
	for <linuxppc-dev@ozlabs.org>; Tue,  7 Oct 2008 07:48:26 +1100 (EST)
Received: from d01relay02.pok.ibm.com (d01relay02.pok.ibm.com [9.56.227.234])
	by e2.ny.us.ibm.com (8.13.8/8.13.8) with ESMTP id m96KmMQs008498
	for <linuxppc-dev@ozlabs.org>; Mon, 6 Oct 2008 16:48:22 -0400
Received: from d01av04.pok.ibm.com (d01av04.pok.ibm.com [9.56.224.64])
	by d01relay02.pok.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id
	m96KmM8E284632
	for <linuxppc-dev@ozlabs.org>; Mon, 6 Oct 2008 16:48:22 -0400
Received: from d01av04.pok.ibm.com (loopback [127.0.0.1])
	by d01av04.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id
	m96KmCcO018240
	for <linuxppc-dev@ozlabs.org>; Mon, 6 Oct 2008 16:48:12 -0400
Message-ID: <48EA79AC.8090705@linux.vnet.ibm.com>
Date: Mon, 06 Oct 2008 15:48:44 -0500
From: Jon Tollefson <kniht@linux.vnet.ibm.com>
MIME-Version: 1.0
To: Kumar Gala <galak@kernel.crashing.org>
Subject: Re: [PATCH] properly reserve in bootmem the lmb reserved regions
	that cross numa nodes
References: <48E23D6C.4030406@linux.vnet.ibm.com>
	<1222789675.13978.14.camel@localhost.localdomain>
	<7E5B6DFB-F9DE-4929-8A4F-8011BF817017@kernel.crashing.org>
	<48EA31D5.70609@linux.vnet.ibm.com>
	<1DA7FAFA-0708-4CFC-B721-B09A29F45B3F@kernel.crashing.org>
In-Reply-To: <1DA7FAFA-0708-4CFC-B721-B09A29F45B3F@kernel.crashing.org>
Content-Type: text/plain; charset=ISO-8859-1
Cc: Linux Memory Management List <linux-mm@kvack.org>,
	linuxppc-dev <linuxppc-dev@ozlabs.org>,
	Adam Litke <agl@linux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.ozlabs.org>
List-Unsubscribe: <https://ozlabs.org/mailman/options/linuxppc-dev>,
	<mailto:linuxppc-dev-request@ozlabs.org?subject=unsubscribe>
List-Archive: <http://ozlabs.org/pipermail/linuxppc-dev>
List-Post: <mailto:linuxppc-dev@ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@ozlabs.org?subject=help>
List-Subscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-dev>,
	<mailto:linuxppc-dev-request@ozlabs.org?subject=subscribe>

Kumar Gala wrote:
>
> On Oct 6, 2008, at 10:42 AM, Jon Tollefson wrote:
>
>> Kumar Gala wrote:
>>> Out of interest how to do you guys represent NUMA regions of memory in
>>> the device tree?
>>>
>>> - k
>> Looking at the source code in numa.c I see at the start of
>> do_init_bootmem() that parse_numa_properties() is called.  It appears to
>> be looking at memory nodes and getting the node id from it.  It gets an
>> associativity property for the memory node and indexes that array with a
>> 'min_common_depth' value to get the node id.
>>
>> This node id is then used to setup the active ranges in the
>> early_node_map[].
>>
>> Is this what you are asking about?  There are others I am sure who know
>> more about it then I though.
>
> I was wondering if this was documented anywhere (like in sPAPR)?
>
> - k
I see some information on it in section "C.6.6".

Jon