Re: [PATCH -v8][RFC] mutex: implement adaptive spinning

Avi Kivity
2009-01-12T17:32:44Z

Peter Zijlstra wrote:
> Spinlocks can use 'pure' MCS locks.
>

How about this, then. In mutex_lock(), keep wait_lock locked and only
release it when scheduling out. Waiter spinning naturally follows. If
spinlocks are cache friendly (are they today?) we inherit that. If
there is no contention on the mutex, then we don't need to reacquire the
wait_lock on mutex_unlock() (not that the atomic op is that expensive
these days).

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error compiling committee.c: too many arguments to function