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Commit da6195b1 authored by qctecmdr's avatar qctecmdr Committed by Gerrit - the friendly Code Review server
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Merge "sched/fair: Prevent tick path active migration to the same CPU"

parents 74e7941e 3a94de0b

kernel/sched/fair.c

+3 −4
Original line number Diff line number Diff line
@@ -12489,7 +12489,6 @@ void check_for_migration(struct rq *rq, struct task_struct *p) 
{

	int active_balance;

	int new_cpu = -1;

	int cpu = smp_processor_id();

	int prev_cpu = task_cpu(p);



	if (rq->misfit_task_load) {
@@ -12504,13 +12503,13 @@ void check_for_migration(struct rq *rq, struct task_struct *p) 
		rcu_read_lock();

		new_cpu = find_energy_efficient_cpu(p, prev_cpu, 0);

		rcu_read_unlock();

		if ((new_cpu != -1) &&

			(capacity_orig_of(new_cpu) > capacity_orig_of(cpu))) {

		if ((new_cpu != prev_cpu) && (capacity_orig_of(new_cpu) >

					capacity_orig_of(prev_cpu))) {

			active_balance = kick_active_balance(rq, p, new_cpu);

			if (active_balance) {

				mark_reserved(new_cpu);

				raw_spin_unlock(&migration_lock);

				stop_one_cpu_nowait(cpu,

				stop_one_cpu_nowait(prev_cpu,

					active_load_balance_cpu_stop, rq,

					&rq->active_balance_work);

				return;