Re: [PATCH][RFC]: mutex: adaptive spin

Peter Zijlstra
2009-01-06T21:45:28Z

On Tue, 2009-01-06 at 13:42 -0800, Paul E. McKenney wrote:
> Preemptable RCU needs to be faster. Got it -- and might have a way
> to do it by eliminating the irq disabling and cutting way back on the
> number of operations that must be performed. It would probably still
> be necessary to access the task structure.
>
> Or is something other than the raw performance of rcu_read_lock() and
> rcu_read_unlock() at issue here?

With Linus' mutex_spin_or_schedule() function the whole - keeping
owner's task_struct alive issue goes away,.. now if only the thing would
boot...