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SubjectRe: [PATCH 4/5] futex: Avoid taking hb lock if nothing to wakeup
On Mon, Nov 25, 2013 at 06:32:55PM +0100, Thomas Gleixner wrote:
> In that context it would also be helpful to measure the overhead on
> x86 for the !empty case.

Yes, because mfence is by no means a cheap instruction on x86.


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