Commit 94e70734 authored by Shrikanth Hegde's avatar Shrikanth Hegde Committed by Peter Zijlstra
Browse files

sched/fair: Change likelyhood of nohz.nr_cpus 



These days most of the system have multi cores. The likelyhood of
at least one or more CPUs in nohz (idle state) is higher.

Give accurate hint to the branch predictor.

Reviewed-and-tested-by: default avatarK Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: default avatarShrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarVincent Guittot <vincent.guittot@linaro.org>
Link: https://patch.msgid.link/20260115073524.376643-3-sshegde@linux.ibm.com
parent 6b67c8a7

kernel/sched/fair.c

+2 −2
Original line number Diff line number Diff line
@@ -12459,9 +12459,9 @@ static void nohz_balancer_kick(struct rq *rq) 


	/*

	 * None are in tickless mode and hence no need for NOHZ idle load

	 * balancing:

	 * balancing

	 */

	if (likely(!atomic_read(&nohz.nr_cpus)))

	if (unlikely(!atomic_read(&nohz.nr_cpus)))

		return;



	if (rq->nr_running >= 2) {