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

[Uladzislau Rezki <urezki@gmail.com>]

On Thu, Mar 07, 2024 at 04:06:06PM -0800, Paul E. McKenney wrote:
> 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@joelfernandes.org> 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@joelfernandes.org>
> > > ---
> > 
> > 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.
> 
Absolutely. I will go through it and send out the next version!

--
Uladzislau Rezki