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

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Message-Id: <20061116101729.41257355.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 16 Nov 2006 10:17:29 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....com>
Cc:	mbligh@...igh.org, steiner@....com, 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

On Wed, 15 Nov 2006 16:57:56 -0800 (PST)
Christoph Lameter <clameter@....com> wrote:
> numa_node_id() points to this and we always get allocations redirected to 
> other nodes. The slab duplicates its per node structures on the fallback 
> node.
> 
> > The zonelist[] donen't contain empty-zone.
> 
> So we will never encounter that zone except when going to the 
> pglist_data struct through numa_node_id()?
> 
Some pgdat/zone scanning code will access it.
See: for_each_zone() and populated_zone().

AFAIK, in 2.6.9 age(means RHEL4), cpus on memory-less-node are moved to the
nearest node. And there were no useless pgdat.

Now, there are memory-less-node. Cpus on memory-less-node are on a pgdat
with empty-zone. I think this is very simple way rather than remapping.
And I think cpus on memory-less-node are sharing something (FSB,switch,etc..)
Tieing cpus to a memory-less-node may have some benefit. 

-Kame

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