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

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Message-Id: <20070207194909.658aa454.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 7 Feb 2007 19:49:09 +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 11:41:25 +0100
Andi Kleen <ak@...e.de> wrote:

> On Wednesday 07 February 2007 11:37, KAMEZAWA Hiroyuki wrote:
> > On Wed, 7 Feb 2007 11:19:02 +0100
> > Andi Kleen <ak@...e.de> wrote:
> > > 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 ?
> 
> Yes.
> 
> > 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.
> 
> Well it is online because A is. For all practical purposes
> it is A, just under a different name.
> 
> > ==
> > looks complicated..and we have to care /sys/devices/system/node handling.
> 
> x86-64 used to do that when it still only did 1:1 cpu<->memory mappings.
> I don't remember any problems with it.
> 

How for_each_online_node(nid) works ? it can handle alias-nid ?

==
	for_each_online_node(nid) {
		pgdat = NODE_DATA(nid);
==
This code never accesses pgdat_for_A twice ?

Thanks,
-Kame


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