linux-kernel - Re: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node

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Message-Id: <200702071119.03125.ak@suse.de>
Date:	Wed, 7 Feb 2007 11:19:02 +0100
From:	Andi Kleen <ak@...e.de>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, y-goto@...fujitsu.com,
	clameter@...r.sgi.com, akpm@...l.org
Subject: Re: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node


> AFAIK, ia64 creates nodes just depends on SRAT's possible resource information.
> Then, ia64 can create cpu-memory-less-node(node with no available resource.).
> (*)I don't like this.
> 
> If we don't allow memory-less-node, we may have to add several codes for cpu-hot-add.
> cpus should be moved to nearby node at hotadd .
> And node-hot-add have to care that cpus mustn't be added before memory, cpu-driven 
> node-hot-add will never occur. (ACPI's 'container' device spec can't guaranntee this.)

You can also alias node numbers to solve this: just point multiple node numbers 
to the same pgdat. For a memory less node this would be a nearby one.

-Andi

 
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