linux-kernel - Re: [RFC] [PATCH] more support for memory-less-node.

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Message-ID: <45D1FF43.9050800@mbligh.org>
Date:	Tue, 13 Feb 2007 10:11:15 -0800
From:	"Martin J. Bligh" <mbligh@...igh.org>
To:	Andi Kleen <ak@...e.de>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Christoph Lameter <clameter@....com>, bob.picco@...com
Subject: Re: [RFC] [PATCH] more support for memory-less-node.

Andi Kleen wrote:
>> Your description of the node is correct, it's an arbitrary container of
>> one or more resources. Not only is this definition flexible, it's also
>> very useful, for memory hotplug, odd types of NUMA boxes, etc.
> 
> I must disagree here. Special cases are always dangerous especially
> if they are hard to regression test. I made this discovery the hard
> way on x86-64 ... It's best to eliminate them in the first place,
> otherwise they will later come back and bite you when you don't expect it.
> 
> Adding NULL tests all over mm for this would seem like a clear case
> of this to me.

I wasn't suggesting having NULL pointers for pgdats, if that's what you
mean. Just nodes with no memory in them, the pgdat would still be there.
pgdat = struct node, except everything's badly named.


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