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Commit 1d82b5e3 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched/rt: Add support for placement boost 



When the placement boost is active for RT tasks, try to
find a CPU in higher capacity groups. If no such CPU is
available, fall back to the CPUs in the other groups.

Change-Id: I5a0edef592a72bee2f4bcca22a13ce7066972725
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent 5ac6978f

kernel/sched/rt.c

+17 −3
Original line number Diff line number Diff line
@@ -1750,6 +1750,9 @@ static int rt_energy_aware_wake_cpu(struct task_struct *task) 
	unsigned long tutil = task_util(task);

	int best_cpu_idle_idx = INT_MAX;

	int cpu_idle_idx = -1, start_cpu;

	bool boost_on_big = sched_boost() == FULL_THROTTLE_BOOST ?

				  (sched_boost_policy() == SCHED_BOOST_ON_BIG) :

				  false;



	rcu_read_lock();
@@ -1761,13 +1764,19 @@ static int rt_energy_aware_wake_cpu(struct task_struct *task) 
	if (!sd)

		goto unlock;



retry:

	sg = sd->groups;

	do {

		int fcpu = group_first_cpu(sg);

		unsigned long capacity_orig = capacity_orig_of(fcpu);

		int capacity_orig = capacity_orig_of(fcpu);



		if (boost_on_big) {

			if (is_min_capacity_cpu(fcpu))

				continue;

		} else {

			if (capacity_orig > best_capacity)

				continue;

		}



		for_each_cpu_and(cpu, lowest_mask, sched_group_span(sg)) {

			if (cpu_isolated(cpu))
@@ -1821,6 +1830,11 @@ static int rt_energy_aware_wake_cpu(struct task_struct *task) 


	} while (sg = sg->next, sg != sd->groups);



	if (unlikely(boost_on_big) && best_cpu == -1) {

		boost_on_big = false;

		goto retry;

	}



unlock:

	rcu_read_unlock();

	return best_cpu;