On Tue, 21 Feb 2006, Nick Piggin wrote:
> Ravikiran G Thirumalai wrote:
> > Following change places each element of the futex_queues hashtable on a
> > different cacheline. Spinlocks of adjacent hash buckets lie on the same
> > cacheline otherwise.
> >
>
> It does not make sense to add swaths of unused memory into a hashtable for
> this purpose, does it?
It does if you essentially have a 4k cacheline (because you are doing NUMA
in software with multiple PCs....) and transferring control of that
cacheline is comparatively expensive.
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