linux-kernel - Re: [patch 2/2] slab: always consider arch mandated alignment

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Message-ID: <Pine.LNX.4.64.0607261229430.7132@schroedinger.engr.sgi.com>
Date:	Wed, 26 Jul 2006 12:31:01 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Manfred Spraul <manfred@...orfullife.com>
cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [patch 2/2] slab: always consider arch mandated alignment

On Wed, 26 Jul 2006, Manfred Spraul wrote:

> > So we sacrifice the ability to worsen the performance of slabs by
> > misaligning them for debugging purposes.
> >  
> If a slab user can live with misaligned objects, then he shouldn't set align.
> Thus we do not sacrifice anything.

A slab user is setting alignment in order to optimize performance not for 
correctness. Most users that I know of can live with misalignments. If 
that would not be the case then this code would never have worked.

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