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

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Message-ID: <48EA31D5.70609@linux.vnet.ibm.com>
Date:	Mon, 06 Oct 2008 10:42:13 -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:
> 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.

Jon

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