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Commit 35032850 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched/rt: Extend energy-aware task placement for SMP 



For SMP, place the RT task on the least loaded CPU in the
first sched group/cluster. When placement boost is active
select the least loaded CPU across all CPU groups/clusters.

Change-Id: Ie193e8b6878c392fcc634b7efebfa73be5ab0562
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent 7293b8b6

kernel/sched/rt.c

+11 −8
Original line number Diff line number Diff line
@@ -1757,7 +1757,7 @@ static int find_lowest_rq(struct task_struct *task) 
	unsigned long tutil = task_util(task);

	int best_cpu_idle_idx = INT_MAX;

	int cpu_idle_idx = -1;

	bool placement_boost;

	enum sched_boost_policy placement_boost;

	bool do_rotate = false;

	bool avoid_prev_cpu = false;
@@ -1771,15 +1771,12 @@ static int find_lowest_rq(struct task_struct *task) 
	if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask))

		return -1; /* No targets found */



	if (energy_aware() && sysctl_sched_is_big_little) {

	if (energy_aware()) {

		sg_target = NULL;

		best_cpu = -1;



		/*

		 * Since this code is inside sched_is_big_little, we are going

		 * to assume that boost policy is SCHED_BOOST_ON_BIG

		 */

		placement_boost = sched_boost() == FULL_THROTTLE_BOOST;

		placement_boost = sched_boost() == FULL_THROTTLE_BOOST ?

				  sched_boost_policy() : SCHED_BOOST_NONE;

		best_capacity = placement_boost ? 0 : ULONG_MAX;



		rcu_read_lock();
@@ -1795,6 +1792,11 @@ static int find_lowest_rq(struct task_struct *task) 
						sched_group_cpus(sg)))

				continue;



			if (!sysctl_sched_is_big_little) {

				sg_target = sg;

				break;

			}



			cpu = group_first_cpu(sg);

			cpu_capacity = capacity_orig_of(cpu);
@@ -1898,12 +1900,13 @@ static int find_lowest_rq(struct task_struct *task) 
			goto retry;

		}



		if (best_cpu != -1) {

		if (best_cpu != -1 && placement_boost != SCHED_BOOST_ON_ALL) {

			return best_cpu;

		} else if (!cpumask_empty(&backup_search_cpu)) {

			cpumask_copy(&search_cpu, &backup_search_cpu);

			cpumask_clear(&backup_search_cpu);

			cpu = -1;

			placement_boost = SCHED_BOOST_NONE;

			goto retry;

		}

	}