linux-kernel - Re: [patch 2/2] enables booting a NUMA system where some nodes have no memory

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Message-ID: <455B98AA.3040904@mbligh.org>
Date:	Wed, 15 Nov 2006 14:46:02 -0800
From:	Martin Bligh <mbligh@...igh.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Christian Krafft <krafft@...ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] enables booting a NUMA system where some nodes have
 no memory

Christoph Lameter wrote:
> On Wed, 15 Nov 2006, Martin Bligh wrote:
> 
>> A node is an arbitrary container object containing one or more of:
>>
>> CPUs
>> Memory
>> IO bus
>>
>> It does not have to contain memory.
> 
> I have never seen a node on Linux without memory. I have seen nodes 
> without processors and without I/O but not without memory.This seems to be 
> something new?

A node was always defined that way. Search back a few years in the lkml
archives. We may be finding bugs in the implementation, but the
definition has not changed.

Supposing we hot-unplugged all the memory in a node? Or seems to have
happened in this instance is boot with mem=, cutting out memory on that
node.

M.

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