netdev - Re: [PATCH 0/9] use this_cpu_ptr instead of per_cpu_ptr(p, smp_processor

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Message-ID: <0000013ab7de641e-c975be0c-e85b-4705-8f02-e25b2d4a0ac2-000000@email.amazonses.com>
Date:	Wed, 31 Oct 2012 17:28:56 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Shan Wei <shanwei88@...il.com>
cc:	David Miller <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>,
	Kernel-Maillist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/9] use this_cpu_ptr instead of  per_cpu_ptr(p,
 smp_processor_id())

On Wed, 31 Oct 2012, Shan Wei wrote:

> this_cpu_ptr is faster than per_cpu_ptr(p, smp_processor_id()).
> The latter helper needs to find the offset for current cpu,
> and needs more assembler instructions which objdump shows in following.

The code is shorter and that helps but note that the main effect is that
memory accesses are reduced.
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