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

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Message-ID: <Pine.LNX.4.64.0611151653560.24565@schroedinger.engr.sgi.com>
Date:	Wed, 15 Nov 2006 16:57:56 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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 Thu, 16 Nov 2006, KAMEZAWA Hiroyuki wrote:

> > But there is no memory on the node. Does the zonelist contain the zones of 
> > the node without memory or not? We simply fall back each allocation to the 
> > next node as if the node was overflowing?
> yes. just fallback.

Ok, so we got a useless pglist_data struct and the struct zone contains a 
zonelist that does not include the zone.

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()?
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