linux-kernel - Re: [RFC, PATCH] SLAB : [NUMA] keep nodeid in struct page instead of struct slab

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Message-ID: <Pine.LNX.4.64.0703210927130.4934@graphe.net>
Date:	Wed, 21 Mar 2007 09:27:45 -0700 (PDT)
From:	Christoph Lameter <christoph@...eter.com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	Eric Dumazet <dada1@...mosbay.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC, PATCH] SLAB : [NUMA] keep nodeid in struct page instead
 of struct slab

On Wed, 21 Mar 2007, Andi Kleen wrote:

> On Wed, Mar 21, 2007 at 05:42:22PM +0200, Pekka J Enberg wrote:
> > On Wed, 21 Mar 2007, Christoph Lameter wrote:
> > > None of that please. The page flags already contain a node number that is 
> > > accessible via page_to_nid(). Just make sure that we never put a slab onto 
> > > the wrong node.
> > 
> > Oh well, here's a patch to find out. (I don't have a NUMA box.)
> 
> You can always use numa emulation on x86-64.  Boot with numa=fake=NODES

This wont help you to debug strange fallback scenarios on unusual NUMA 
platforms.

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