Re: [PATCH tip/core/rcu 02/15] rcu: Use timer as backstop for NOCB deferred wakeups

[Paul E. McKenney]

On Wed, Jul 26, 2017 at 07:09:34PM -0400, Steven Rostedt wrote:
> On Wed, 26 Jul 2017 14:47:41 -0700
> "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote:
> 
> 
> > > It is much lighter weight than a timer setup.  
> > 
> > How much lighter weight?  In other words, what fraction of the
> > timers have to avoid being cancelled for irq_work to break even?
> 
> No idea. I guess that would be a nice academic exercise ;-)

Hmmm...  I guess I should try it and see what it does, though that
would be some merge window after the upcoming one.  If it is indeed
simpler, I might forgive some possible performance shortcomings...

							Thanx, Paul