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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