Re: [RFC] NUMA futex hashing

[Jes Sorensen]

>>>>> "Andi" == Andi Kleen <ak@xxxxxxx> writes:

Andi> Jes Sorensen <jes@xxxxxxx> 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.

Jes
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