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

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Message-ID: <455C8875.3070109@mbligh.org>
Date:	Thu, 16 Nov 2006 07:49:09 -0800
From:	"Martin J. Bligh" <mbligh@...igh.org>
To:	Christian Krafft <krafft@...ibm.com>
Cc:	Christoph Lameter <clameter@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	steiner@....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

Christian Krafft wrote:
> On Wed, 15 Nov 2006 16:57:56 -0800 (PST)
> Christoph Lameter <clameter@....com> wrote:
> 
>> 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.
> 
> Okay, I slowly understand what you are talking about.
> I just tried a "numactl --cpunodebind 1 --membind 1 true" which hit an uninitialized zone in slab_node:
> 
> return zone_to_nid(policy->v.zonelist->zones[0]);
> 
> I also still don't know if it makes sense to have memoryless nodes, but supporting it does.
> So wath would be reasonable, to have empty zonelists for those node, or to check if zonelists are uninitialized ?

You don't want empty zonelists on a node containing CPUs, else it won't
know where to allocate from. You just want to make sure that the zones
in that node (if existant) are not contained in *anyone's* zonelist.

M.

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