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Date: Tue, 30 Apr 2013 13:32:20 +0000
From: Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH 1/2] Make the batch size of the percpu_counter
 configurable
In-Reply-To: <c1f9c476a8bd1f5e7049b8ac79af48be61afd8f3.1367254913.git.tim.c.chen@linux.intel.com>
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References: <c1f9c476a8bd1f5e7049b8ac79af48be61afd8f3.1367254913.git.tim.c.chen@linux.intel.com>
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To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Tejun Heo <tj@kernel.org>, Al Viro <viro@zeniv.linux.org.uk>, Dave Hansen <dave.hansen@intel.com>, Andi Kleen <ak@linux.intel.com>, linux-kernel <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>

On Mon, 29 Apr 2013, Tim Chen wrote:

> diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h
> index d5dd465..5ca7df5 100644
> --- a/include/linux/percpu_counter.h
> +++ b/include/linux/percpu_counter.h
> @@ -22,6 +22,7 @@ struct percpu_counter {
>  	struct list_head list;	/* All percpu_counters are on a list */
>  #endif
>  	s32 __percpu *counters;
> +	int *batch ____cacheline_aligned_in_smp;
>  };

What is this for and why does it have that alignmend?

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