netdev - Re: [rfc][patch 3/3] use SLAB_ALIGN

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Date:	Mon, 3 Mar 2008 11:10:50 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <npiggin@...e.de>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	yanmin_zhang@...ux.intel.com, David Miller <davem@...emloft.net>
Subject: Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP

On Mon, 3 Mar 2008, Eric Dumazet wrote:

> This reminds me a previous attempt of removing SLAB_HWCACHE_ALIGN
> 
> http://kernel.org/pub/linux/kernel/people/christoph/patch-archive/2007/2.6.21-rc6/remove_hwcache_align
> 
> At that time Christoph didnt took into account the CONFIG_SMP thing (false
> sharing avoidance), but also that L1_CACHE_SIZE is a compile constant, that
> can differs with cache_line_size()

If cache_line_size() is universally available then we can specify it as 
the alignment parameter to kmem_cache_create(). That would allow removal 
of SLAB_HWCACHE_ALIGN.

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