Messages in this thread | | | Subject | Re: [RFC] NUMA futex hashing | From | Jes Sorensen <> | Date | 08 Aug 2006 06:07:47 -0400 |
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>>>>> "Andi" == Andi Kleen <ak@suse.de> writes:
Andi> Jes Sorensen <jes@sgi.com> writes: >> Using that argument, all you need to do is to add the alignment >> ____cacheline_aligned_in_smp to the definition of struct >> futex_hash_bucket and the problem is solved, given that the >> internode cacheline in a NUMA system is defined to be the same as >> the SMP cacheline size.
Andi> Yes but it would waste quite a lot of memory and cache. Wasted Andi> cache = slow.
Compared to the extra level of indirection, I doubt it would be measurable. The cache space is barely wasted, we're talking approximately half a cacheline per futex hash bucket in use.
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