linux-kernel - Re: [PATCH] properly reserve in bootmem the lmb reserved regions that cross numa nodes

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Message-ID: <48EA79AC.8090705@linux.vnet.ibm.com>
Date:	Mon, 06 Oct 2008 15:48:44 -0500
From:	Jon Tollefson <kniht@...ux.vnet.ibm.com>
To:	Kumar Gala <galak@...nel.crashing.org>
CC:	Adam Litke <agl@...ibm.com>,
	linuxppc-dev <linuxppc-dev@...abs.org>,
	Adam Litke <agl@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH] properly reserve in bootmem the lmb reserved regions
 that cross numa nodes

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

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