osnoise: handle quiescent states for PREEMPT_RCU=n, PREEMPTION=y
To reduce RCU noise for nohz_full configurations, osnoise depends
on cond_resched() providing quiescent states for PREEMPT_RCU=n
configurations. And, for PREEMPT_RCU=y configurations does this
by directly calling rcu_momentary_dyntick_idle().
With PREEMPT_AUTO=y, however, we can have configurations with
(PREEMPTION=y, PREEMPT_RCU=n), which means neither of the above can
help.
Handle that by fallback to the explicit quiescent states via
rcu_momentary_dyntick_idle().
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
1 file changed
