linux-kernel - Re: [PATCH]mmap: add alignment for some variables

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Message-Id: <20110329184110.0086924e.akpm@linux-foundation.org>
Date:	Tue, 29 Mar 2011 18:41:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-mm <linux-mm@...ck.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH]mmap: add alignment for some variables

On Wed, 30 Mar 2011 09:36:40 +0800 Shaohua Li <shaohua.li@...el.com> wrote:

> > how is it that this improves things?
> Hmm, it actually is:
> struct percpu_counter {
>  	spinlock_t lock;
>  	s64 count;
>  #ifdef CONFIG_HOTPLUG_CPU
>  	struct list_head list;	/* All percpu_counters are on a list */
>  #endif
>  	s32 __percpu *counters;
>  } __attribute__((__aligned__(1 << (INTERNODE_CACHE_SHIFT))))
> so lock and count are in one cache line.

____cacheline_aligned_in_smp would achieve that?
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