netdev - Re: [rfc][patch 2/3] slab: introduce SMP alignment

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Message-ID: <20080303200355.GB8974@wotan.suse.de>
Date:	Mon, 3 Mar 2008 21:03:55 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Christoph Lameter <clameter@....com>
Cc:	netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	yanmin_zhang@...ux.intel.com, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [rfc][patch 2/3] slab: introduce SMP alignment

On Mon, Mar 03, 2008 at 11:06:55AM -0800, Christoph Lameter wrote:
> On Mon, 3 Mar 2008, Nick Piggin wrote:
> 
> > Introduce SLAB_SMP_ALIGN, for allocations where false sharing must be
> > minimised on SMP systems.
> 
> Mandatory alignment are specified as a parameter to kmem_cache_create not 
> as flags.

Not after this patch.

> Ycan specify the alignment as a parameter. i.e. L1_CACHE_BYTES 
> or cache_line_size().

We don't want either of those, though.

I don't see why this is a problem to do inside slab.
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