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

Paul E. McKenney
2009-01-06T22:38:53Z

On Tue, Jan 06, 2009 at 10:44:35PM +0100, Peter Zijlstra wrote:
> 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...

Cool! And I can relate to the "if only the thing would boot" part. ;-)

Thanx, Paul