linux-kernel - Re: [patch] slab: always follow arch requested alignments

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Message-ID: <Pine.LNX.4.64.0607260433410.3855@schroedinger.engr.sgi.com>
Date:	Wed, 26 Jul 2006 04:41:04 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch] slab: always follow arch requested alignments

On Wed, 26 Jul 2006, Pekka J Enberg wrote:

> On Wed, 26 Jul 2006, Christoph Lameter wrote:
> > Well that is a bit far reaching. What is broken is that SLAB_RED_ZONE and
> > SLAB_STORE_USER ignore any given alignment. If you want to fix that then 
> > you need to modify how both debugging methods work.
> 
> Not sure I understand what you mean. Isn't it enough that we disable 
> debugging if architecture or caller mandated alignment is greater than 
> BYTES_PER_WORD?

If you disable them then we are fine. I think the main "bug" is that 
we create the caches with ARCH_KMALLOC_MINALIGN in kmem_cache_init but 
allow debug options on them. It seemss that we need to be able to disable 
debugging from kmem_cache_init.
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