On Tue, Aug 30, 2022 at 12:50:02PM +0200, Frederic Weisbecker wrote: > On Mon, Aug 29, 2022 at 01:31:31PM -0700, Paul E. McKenney wrote: [ . . . ] > > Another test would be to look at which callbacks are being invoked > > on each grace period. We have to have a substantial number of grace > > periods having all lazy callbacks before call_rcu_lazy() has any chance > > of helping. This would need to happen on a server platform because > > Android and ChromeOS data might or might not carry over. > > Also that yes. What would be the best way to collect that data? Please keep in mind that unless/until we have some clear empirical indication that call_rcu_lazy() really would help the world of systems running without rcu_nocbs, moving the call_rcu_lazy() implementation from the bypass list to cblist does nothing but increase risk to system that get no benef from call_rcu_lazy(). Thanx, Paul
