linux-kernel - Re: [RFC] slub: ARCH_SLAB_MINALIGN defaults to 8 on x86

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Message-ID: <20100204000755.GA451@linux-sh.org>
Date:	Thu, 4 Feb 2010 09:07:56 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Richard Kennedy <richard@....demon.co.uk>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	penberg <penberg@...helsinki.fi>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC] slub: ARCH_SLAB_MINALIGN defaults to 8 on x86_32. is this too big?

On Wed, Feb 03, 2010 at 02:22:26PM +0000, Richard Kennedy wrote:
> Can I define a ARCH_SLAB_MINALIGN in x86_64 to sizeof(void *) ? 
> or would it be ok to change the default in slub.c to sizeof(void *) ?
> 
Note that this is precisely what ARCH_SLAB_MINALIGN was introduced to
avoid (BYTES_PER_WORD alignment used to be the default for slab, before
ARCH_SLAB_MINALIGN was introduced). Consider the case of 64-bit platforms
using a 32-bit ABI, the native alignment remains 64-bit while sizeof(void
*) == 4. There are a number of (mainly embedded) architectures that
support these sorts of configurations in-tree.
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