Re: [PATCH]mmap: add alignment for some variables

[Andrew Morton]

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