Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f99e3fe6 authored by Juri Lelli's avatar Juri Lelli Committed by Leo Yan
Browse files

sched/fair: cpufreq_sched triggers for load balancing 



As we don't trigger freq changes from {en,de}queue_task_fair() during load
balancing, we need to do explicitly so on load balancing paths.

[smuckle@linaro.org: move update_capacity_of calls so rq lock is held]

cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarJuri Lelli <juri.lelli@arm.com>
Signed-off-by: default avatarSteve Muckle <smuckle@linaro.org>
parent 7ff814dd

kernel/sched/fair.c

+20 −1
Original line number Diff line number Diff line
@@ -6384,6 +6384,10 @@ static void attach_one_task(struct rq *rq, struct task_struct *p) 
{

	raw_spin_lock(&rq->lock);

	attach_task(rq, p);

	/*

	 * We want to potentially raise target_cpu's OPP.

	 */

	update_capacity_of(cpu_of(rq));

	raw_spin_unlock(&rq->lock);

}
@@ -6405,6 +6409,11 @@ static void attach_tasks(struct lb_env *env) 
		attach_task(env->dst_rq, p);

	}



	/*

	 * We want to potentially raise env.dst_cpu's OPP.

	 */

	update_capacity_of(env->dst_cpu);



	raw_spin_unlock(&env->dst_rq->lock);

}
@@ -7667,6 +7676,11 @@ more_balance: 
		 * ld_moved     - cumulative load moved across iterations

		 */

		cur_ld_moved = detach_tasks(&env);

		/*

		 * We want to potentially lower env.src_cpu's OPP.

		 */

		if (cur_ld_moved)

			update_capacity_of(env.src_cpu);



		/*

		 * We've detached some tasks from busiest_rq. Every
@@ -8037,8 +8051,13 @@ static int active_load_balance_cpu_stop(void *data) 
		schedstat_inc(sd, alb_count);



		p = detach_one_task(&env);

		if (p)

		if (p) {

			schedstat_inc(sd, alb_pushed);

			/*

			 * We want to potentially lower env.src_cpu's OPP.

			 */

			update_capacity_of(env.src_cpu);

		}

		else

			schedstat_inc(sd, alb_failed);

	}