linux-kernel - Re: [BUG][PATCH] fix mempolcy's check on a system with memory-less-node take2

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Date:	Thu, 8 Feb 2007 09:03:46 +0100
From:	Andi Kleen <ak@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>, clameter@....com,
	GOTO <y-goto@...fujitsu.com>
Subject: Re: [BUG][PATCH] fix mempolcy's check on a system with memory-less-node take2

On Thursday 08 February 2007 09:00, Andrew Morton wrote:
> On Thu, 8 Feb 2007 08:49:41 +0100 Andi Kleen <ak@...e.de> wrote:
> 
> > 
> > > This panic(hang) was found by a numa test-set on a system with 3 nodes, where
> > > node(2) was memory-less-node.
> > 
> > I still think it's the wrong fix -- just get rid of the memory less node.
> 
> "Let's break it even more"?

I still don't get what you believe what would be broken then.

> > I expect you'll likely run into more problems with that setup anyways.
> 
> What happens if he doesn't run into more problems?

Then he's lucky. I ran into problems at least when I still had the empty
nodes some time ago on x86-64.  Christoph said SN2 is doing the same.

iirc slab blew up at least, but that  might be fixed by now. But it's a little risky 
because there is more code now that is node aware.

-Andi
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