Re: [patch] Cache align futex hash buckets

Ravikiran G Thirumalai <[email protected]> wrote:
>
> We also collected hash collision statistics for 1024 slots.  We found that
>  50% of the slots did not take any hit!!  So maybe we should revisit the
>  hashing function before settling on the optimal number of hash slots. 

You could try switching from jhash2() to hash_long().

Was there any particular pattern to the unused slots?  Not something silly
like every second one?
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• References:
  • [patch] Cache align futex hash buckets
    • From: Ravikiran G Thirumalai <[email protected]>
  • Re: [patch] Cache align futex hash buckets
    • From: Nick Piggin <[email protected]>
  • Re: [patch] Cache align futex hash buckets
    • From: Christoph Lameter <[email protected]>
  • Re: [patch] Cache align futex hash buckets
    • From: Nick Piggin <[email protected]>
  • Re: [patch] Cache align futex hash buckets
    • From: Andrew Morton <[email protected]>
  • Re: [patch] Cache align futex hash buckets
    • From: Nick Piggin <[email protected]>
  • Re: [patch] Cache align futex hash buckets
    • From: Ravikiran G Thirumalai <[email protected]>

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