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

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Message-Id: <20070321164927.98256bf8.dada1@cosmosbay.com>
Date:	Wed, 21 Mar 2007 16:49:27 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
Cc:	Christoph Lameter <christoph@...eter.com>,
	Andi Kleen <andi@...stfloor.org>,
	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 17:42:22 +0200 (EET)
Pekka J Enberg <penberg@...helsinki.fi> 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.)
> 

This wont work, because of use_alien_caches knob.

If use_alien_caches is set to 0, your WARN_ON will trigger many false alarms

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