Commit 9dc85465 authored May 22, 2019 by Pavankumar Kondeti Committed by Gerrit - the friendly Code Review server May 29, 2019

sched/core: Improve CPU hotplug latency for rcu_expedited=1 case



The sched_cpu_deactivate()->synchronize_rcu_mult() is not taking
expedited path even though rcu_expedited is enabled. So split
the synchronize_rcu_mult() call into synchronize_sched() and
synchronize_rcu() to improve the hotplug latency.

Change-Id: Ic21fbf790e7ed2f314b4058a489cde7813897c1f
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

parent 84606f73

kernel/sched/core.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -6332,7 +6332,11 @@ int sched_cpu_deactivate(unsigned int cpu)
		*
		* Do sync before park smpboot threads to take care the rcu boost case.
		*/
		synchronize_rcu_mult(call_rcu, call_rcu_sched);

		#ifdef CONFIG_PREEMPT
		synchronize_sched();
		#endif
		synchronize_rcu();

		#ifdef CONFIG_SCHED_SMT
		/*