Re: [PATCH] [RFC] rcu/tree: Reduce wake up for synchronize_rcu() common case

[Paul E. McKenney]

On Thu, Mar 07, 2024 at 06:52:14PM -0500, Joel Fernandes wrote:
> On Thu, Mar 7, 2024 at 6:48 PM Joel Fernandes (Google)
> <joel@xxxxxxxxxxxxxxxxx> wrote:
> >
> > In the synchronize_rcu() common case, we will have less than
> > SR_MAX_USERS_WAKE_FROM_GP number of users per GP. Waking up the kworker
> > is pointless just to free the last injected wait head since at that point,
> > all the users have already been awakened.
> >
> > Introduce a new counter to track this and prevent the wakeup in the
> > common case.
> >
> > Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
> > ---
> 
> Forgot to mention, this is based on the latest RCU -dev branch and
> passes light rcutorture testing on all configs. Heavier rcutorture
> testing (60 minutes) was performed on TREE03.

Very good, thank you!

Uladzislau, could you please pull this into the next series you send?
I can then replace your commits in -rcu with the updated series.

							Thanx, Paul