Messages in this thread | | | Date | Tue, 21 Feb 2006 10:33:44 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [patch] Cache align futex hash buckets |
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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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