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

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Date:	Wed, 14 Feb 2007 09:12:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....com>
Cc:	andi@...stfloor.org, linux-kernel@...r.kernel.org, akpm@...l.org,
	bob.picco@...com
Subject: Re: [RFC] [PATCH] more support for memory-less-node.

On Tue, 13 Feb 2007 09:25:00 -0800 (PST)
Christoph Lameter <clameter@....com> wrote:

> On Tue, 13 Feb 2007, KAMEZAWA Hiroyuki wrote:
> 
> > NOD_DATA(nid) is always valid pointer if a node is online.
> > NODE_DATA(nid)->present_pages can be 0 even if a node is online, 
> > I call this as memory-less-node.
> 
> Yes but the pgdat will have no valid zone in it. That is new.
> 
we have populated_zone() macro for checking it.

(I noticed node-hotplug can create memory-less-zone until memory is
 onlined by the user.)


-Kame

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