On Thu, Jul 06, 2017 at 06:05:55PM +0200, Peter Zijlstra wrote: > On Thu, Jul 06, 2017 at 02:12:24PM +0000, David Laight wrote: > > From: Paul E. McKenney [ . . . ] > Now on the one hand I feel like Oleg that it would be a shame to loose > the optimization, OTOH this thing is really really tricky to use, > and has lead to a number of bugs already. I do agree, it is a bit sad to see these optimizations go. So, should this make mainline, I will be tagging the commits that spin_unlock_wait() so that they can be easily reverted should someone come up with good semantics and a compelling use case with compelling performance benefits. Thanx, Paul
