On Fri, 2015-04-10 at 18:11 +0200, Sebastian Andrzej Siewior wrote:
> This patch delays the wakeup of the process untill
^^^ until
> the hb->lock is
> dropped to avoid boosting + context switch to obtain the lock.
Doing the wakeups while holding the lock is also a general performance
issue for futex_wake. The problem being dealing with spurious wakeups
(wacky drivers), which makes no difference wrt nr_wake.
Thanks,
Davidlohr
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