On Tue, Mar 04, 2025 at 02:21:27PM -0500, Steven Rostedt wrote: > On Mon, 24 Feb 2025 19:55:11 -0800 > Boqun Feng <boqun.feng@xxxxxxxxx> wrote: > > > From: Ankur Arora <ankur.a.arora@xxxxxxxxxx> > > > > To reduce RCU noise for nohz_full configurations, osnoise depends > > on cond_resched() providing quiescent states for PREEMPT_RCU=n > > configurations. For PREEMPT_RCU=y configurations -- where > > cond_resched() is a stub -- we do this by directly calling > > rcu_momentary_eqs(). > > > > With (PREEMPT_LAZY=y, PREEMPT_DYNAMIC=n), however, we have a > > configuration with (PREEMPTION=y, PREEMPT_RCU=n) where neither > > of the above can help. > > > > Handle that by providing an explicit quiescent state here for all > > configurations. > > > > As mentioned above this is not needed for non-stubbed cond_resched(), > > but, providing a quiescent state here just pulls in one that a future > > cond_resched() would provide, so doesn't cause any extra work for > > this configuration. > > > > Cc: Paul E. McKenney <paulmck@xxxxxxxxxx> > > Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> > > Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> > > Acked-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> > Applied, thanks! Regards, Boqun > -- Steve > > > Suggested-by: Paul E. McKenney <paulmck@xxxxxxxxxx> > > Acked-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> > > Signed-off-by: Ankur Arora <ankur.a.arora@xxxxxxxxxx> > > Reviewed-by: Frederic Weisbecker <frederic@xxxxxxxxxx> > > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> > > Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx> > > ---
