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From: Andi Kleen <ak@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	LKML <linux-kernel@vger.kernel.org>, GOTO <y-goto@jp.fujitsu.com>,
	Christoph Lameter <clameter@engr.sgi.com>
Subject: Re: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node
Date: Wed, 7 Feb 2007 17:50:55 +0100	[thread overview]
Message-ID: <200702071750.55283.ak@suse.de> (raw)
In-Reply-To: <20070207082330.d07525ec.akpm@linux-foundation.org>

On Wednesday 07 February 2007 17:23, Andrew Morton wrote:
> On 07 Feb 2007 11:20:06 +0100 Andi Kleen <ak@suse.de> wrote:
> 
> > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> writes:
> > 
> > > current mempolicy just checks whether a node is online or not.
> > > If there is memory-less-node, mempolicy's target node can be
> > > invalid.
> > > This patch adds a check whether a node has memory or not.
> > 
> > IMHO there shouldn't be any memory less nodes. The architecture code
> > should not create them. The CPU should be assigned to a nearby node instead.
> 
> umm, why?
> 
> A node which has CPUs and no memory is obviously physically possible and
> isn't a completely insane thing for a user to do.  I'd have thought that
> the kernel should be able to cleanly and clearly handle it,

It doesn't.

> and to 
> accurately present the machine's topology to the user without us having to
> go adding falsehoods like this?

a node is a piece of memory. Without memory it doesn't make sense.

-Andi
 

  reply	other threads:[~2007-02-07 16:51 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06 11:23 KAMEZAWA Hiroyuki
2007-02-06 17:26 ` Christoph Lameter
2007-02-07  1:14   ` KAMEZAWA Hiroyuki
2007-02-07  8:04     ` Christoph Lameter
2007-02-07  8:36       ` KAMEZAWA Hiroyuki
2007-02-08 11:49         ` Bob Picco
2007-02-07 10:20       ` Andi Kleen
2007-02-07 10:20 ` Andi Kleen
2007-02-07 10:07   ` KAMEZAWA Hiroyuki
2007-02-07 10:19     ` Andi Kleen
2007-02-07 10:37       ` KAMEZAWA Hiroyuki
2007-02-07 10:41         ` Andi Kleen
2007-02-07 10:49           ` KAMEZAWA Hiroyuki
2007-02-07 11:32             ` Andi Kleen
2007-02-07 12:27               ` KAMEZAWA Hiroyuki
2007-02-07 14:05     ` Christoph Lameter
2007-02-07 15:28       ` KAMEZAWA Hiroyuki
2007-02-07 14:03   ` Christoph Lameter
2007-02-07 16:23   ` Andrew Morton
2007-02-07 16:50     ` Andi Kleen [this message]
2007-02-07 17:43       ` Andrew Morton
2007-02-07 18:15         ` [PATCH] FS : Speedup rw_verify_area() Eric Dumazet
2007-02-08  0:37         ` [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node KAMEZAWA Hiroyuki
2007-02-08 19:09         ` Christoph Lameter
2007-02-08 19:26           ` Andrew Morton
2007-02-08 19:35             ` Christoph Lameter

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