On Wed, 19 Jul 2017, Paul E. McKenney wrote: > > Do we have any problem if we skip RCU idle enter/exit under a fast idle > > scenario? > > My understanding is, if tick is not stopped, then we don't need inform RCU > > in > > idle path, it can be informed in irq exit. > > Indeed, the problem arises when the tick is stopped.
Well is there a boundary when you would want the notification calls? I would think that even an idle period of a couple of seconds does not necessarily require a callback to rcu. Had some brokenness here where RCU calls did not occur for hours or so. At some point the system ran out of memory but thats far off.
