linux-kernel - Re: [PATCH] slab: Ignore internal flags in cache creation

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Message-ID: <0000013a0d314c3f-e5b12d01-7a99-4368-82a0-f5de4d46f804-000000@email.amazonses.com>
Date:	Fri, 28 Sep 2012 14:04:25 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Glauber Costa <glommer@...allels.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.cz>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH] slab: Ignore internal flags in cache creation

On Thu, 27 Sep 2012, David Rientjes wrote:

> > This means touching another field from critical paths of the allocators.
> > It would increase the cache footprint and therefore reduce performance.
> >
>
> To clarify your statement, you're referring to the mm/slab.c allocation of
> new slab pages and when debugging is enabled as "critical paths", correct?
> We would disagree on that point.

This is not debugging specific. Flags are also consulted to do RCU
processing and other things.
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