linux-kernel - Re: [this_cpu_xx V8 07/16] Module handling: Use this_cpu

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Message-ID: <4B2F2F83.4070901@kernel.org>
Date:	Mon, 21 Dec 2009 17:19:15 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [this_cpu_xx V8 07/16] Module handling: Use this_cpu_xx to dynamically
 allocate counters

On 12/21/2009 04:59 PM, Tejun Heo wrote:
> Here's the version I committed to percpu branch.
> 
> Thanks.
> 
> From 8af47ddd01364ae3c663c0bc92415c06fe887ba1 Mon Sep 17 00:00:00 2001
> From: Christoph Lameter <cl@...ux-foundation.org>
> Date: Fri, 18 Dec 2009 16:26:24 -0600
> Subject: [PATCH] module: Use this_cpu_xx to dynamically allocate counters
> 
> Use cpu ops to deal with the per cpu data instead of a local_t. Reduces memory
> requirements, cache footprint and decreases cycle counts.
> 
> The this_cpu_xx operations are also used for !SMP mode. Otherwise we could
> not drop the use of __module_ref_addr() which would make per cpu data handling
> complicated. this_cpu_xx operations have their own fallback for !SMP.
> 
> The last hold out of users of local_t is the tracing ringbuffer after this patch
> has been applied.
> 
> Signed-off-by: Christoph Lameter <cl@...ux-foundation.org>
> Cc: Rusty Russell <rusty@...tcorp.com.au>

This was changed to Acked-by as Rusty acked on the previous thread.

Thanks.

-- 
tejun
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