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

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Message-Id: <20070207193749.fa58632e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 7 Feb 2007 19:37:49 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andi Kleen <ak@...e.de>
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

On Wed, 7 Feb 2007 11:19:02 +0100
Andi Kleen <ak@...e.de> wrote:

> 
> > 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.
> 
Hmm, interesting...the 'alias' means follwing ?
==
NODE_DATA(A) = pgdat_for_A
NODE_DATA(B) = pgdat_for_A // B is memory-less.
- NODE_DATA(B) is valid but B is not online.
==
looks complicated..and we have to care /sys/devices/system/node handling.

-Kame

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