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SubjectRe: [RFC patch 0/5] futex: Allow lockless empty check of hashbucket plist in futex_wake()
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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