linux-kernel - Re: [PATCH] pci: derive nearby CPUs from device's instead of bus' NUMA information

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Date:	Tue, 21 Apr 2009 20:05:14 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, jbarnes@...tuousgeek.org,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci: derive nearby CPUs from device's instead of bus'
	NUMA information

On Mon, Apr 20, 2009 at 02:23:47PM -0700, Yinghai Lu wrote:
> On Mon, Apr 20, 2009 at 1:47 AM, Andreas Herrmann
> <andreas.herrmann3@....com> wrote:
> > During initialization the struct device's numa_node is set to -1 and
> > later on the information is inherited from the parent numa_node.
> >
> parent numa_node could be -1 too.
> 
> in amd_bus.c
> int get_mp_bus_to_node(int busnum)
> {
>         int node = -1;
> 
>         if (busnum < 0 || busnum > (BUS_NR - 1))
>                 return node;
> 
>         node = mp_bus_to_node[busnum];
> 
>         /*
>          * let numa_node_id to decide it later in dma_alloc_pages
>          * if there is no ram on that node
>          */
>         if (node != -1 && !node_online(node))
>                 node = -1;
> 
>         return node;
> }

Ok, I see.
Thanks,

Andreas


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