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

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Message-ID: <Pine.LNX.4.58.0607270844440.28990@sbz-30.cs.Helsinki.FI>
Date:	Thu, 27 Jul 2006 08:47:16 +0300 (EEST)
From:	Pekka J Enberg <penberg@...Helsinki.FI>
To:	Christoph Lameter <clameter@....com>
cc:	Manfred Spraul <manfred@...orfullife.com>,
	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 Thu, 27 Jul 2006, Pekka J Enberg wrote:
> Yes and that's what we have been saying all along. When you want 
> performance, you use SLAB_HWCACHE_ALIGN and let the allocator do its job. 
> I don't see much point from API point of view for the caller to explicitly 
> ask for a given alignment and then in addition pass a 'yes I really meant' 
> flag (SLAB_DEBUG_OVERRIDE).

Btw, /proc/slabinfo for UML with defconfig reveals change for only one 
cache with my patch applied. The 'dquot' cache is created by dquot_init in 
fs/dquot.c and doesn't really seem to need the alignment for anything...

				Pekka
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