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Commit b4e3031d authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched/fair: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: Ice00d43c70be105b5bc3ad09caa6047aa98d7402
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent d89e0499

kernel/sched/fair.c

+33 −3
Original line number Diff line number Diff line
@@ -11205,6 +11205,27 @@ update_next_balance(struct sched_domain *sd, unsigned long *next_balance) 
		*next_balance = next;

}



#ifdef CONFIG_SCHED_WALT

static inline bool min_cap_cluster_has_misfit_task(void)

{

	int cpu;



	for_each_possible_cpu(cpu) {

		if (!is_min_capacity_cpu(cpu))

			break;

		if (cpu_rq(cpu)->walt_stats.nr_big_tasks)

			return true;

	}



	return false;

}

#else

static inline bool min_cap_cluster_has_misfit_task(void)

{

	return false;

}

#endif



/*

 * idle_balance is called by schedule() if this_cpu is about to become

 * idle. Attempts to pull tasks from other CPUs.
@@ -11216,6 +11237,7 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) 
	struct sched_domain *sd;

	int pulled_task = 0;

	u64 curr_cost = 0;

	bool force_lb = false;



	if (cpu_isolated(this_cpu))

		return 0;
@@ -11232,6 +11254,13 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) 
	if (!cpu_active(this_cpu))

		return 0;



	/*

	 * Force higher capacity CPUs doing load balance, when the lower

	 * capacity CPUs has some misfit tasks.

	 */

	if (!is_min_capacity_cpu(this_cpu) && min_cap_cluster_has_misfit_task())

		force_lb = true;



	/*

	 * This is OK, because current is on_cpu, which avoids it being picked

	 * for load-balance and preemption/IRQs are still disabled avoiding
@@ -11240,8 +11269,8 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) 
	 */

	rq_unpin_lock(this_rq, rf);



	if (this_rq->avg_idle < sysctl_sched_migration_cost ||

	    !READ_ONCE(this_rq->rd->overload)) {

	if (!force_lb && (this_rq->avg_idle < sysctl_sched_migration_cost ||

	    !READ_ONCE(this_rq->rd->overload))) {

		rcu_read_lock();

		sd = rcu_dereference_check_sched_domain(this_rq->sd);

		if (sd)
@@ -11266,7 +11295,8 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) 
			continue;

		}



		if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) {

		if (!force_lb &&

		    this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) {

			update_next_balance(sd, &next_balance);

			break;

		}