linux-kernel - Re: [PATCH 1/2] Make the batch size of the percpu

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Message-ID: <0000013e5b24d2c5-9b899862-e2fd-4413-8094-4f1e5a0c0f62-000000@email.amazonses.com>
Date:	Tue, 30 Apr 2013 13:32:20 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH 1/2] Make the batch size of the percpu_counter
 configurable

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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