Re: [RFC patch 0/5] futex: Allow lockless empty check of hashbucketplist in futex_wake()

[Peter Zijlstra]

On Sun, Dec 01, 2013 at 01:10:22PM +0100, Ingo Molnar wrote:
> But more importantly, since these are all NUMA systems, would it make 
> sense to create per node hashes on NUMA? Each futex would be enqueued 
> into the hash belonging to its own page's node.

Can't do that; we hash on vaddr, the actual page can move between nodes
while a futex is queued.

This would mean that the waiting futex is queued on another node than
the waker is looking.
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