Re: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptivespinning

From: Alan Cox
Date: Tue Apr 06 2010 - 12:50:12 EST

> That works for the uncontended case. For the contended case, the waiter
> and the owner have to go into the kernel and back out to transfer
> ownership.

If you insist on doing it that way yes, but knowing the lock owner is
likely to be away for a while also lets you do things like punt work
either by picking another work package in the meantime, or by queueing
the work you can't do on a list the pre-empted lock owner will review
before dropping the lock.

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