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

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Message-ID: <Pine.LNX.4.58.0607261529240.20519@sbz-30.cs.Helsinki.FI>
Date:	Wed, 26 Jul 2006 15:31:13 +0300 (EEST)
From:	Pekka J Enberg <penberg@...Helsinki.FI>
To:	Christoph Lameter <clameter@....com>
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, Christoph Lameter wrote:
> The following patch adds an option SLAB_DEBUG_OVERRIDE to switch off
> debugging if its on by default. S390 would have to set ARCH_KMALLOC_FLAGS
> to SLAB_DEBUG_OVERRIDE. The flag will then be passed in 
> kmem_cache_init to kmem_cache_create(). This approach also preserves the 
> existing slab behavior for all other archs.

Please read my patch again. The rules are simple: we must disable 
debugging if architecture OR caller mandated alignment is greater than 
BYTES_PER_WORD. Note: for kmem_cache_init() the caller mandated alignment 
_is_ ARCH_KMALLOC_MINALIGN.

My patch takes care of _both_ ARCH_KMALLOC_MINALIGN and 
ARCH_SLAB_MINALIGN.

				Pekka
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