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Commit 3ee62b19 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched/fair: Improve the scheduler 



This change is for general scheduler improvements.

Change-Id: Ie304f84fde7d591f54dac5c401d7881adf506216
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent fabf15c0

kernel/sched/fair.c

+21 −2
Original line number Diff line number Diff line
@@ -11768,6 +11768,21 @@ static inline bool nohz_idle_balance(struct rq *this_rq, enum cpu_idle_type idle 
static inline void nohz_newidle_balance(struct rq *this_rq) { }

#endif /* CONFIG_NO_HZ_COMMON */



static bool silver_has_big_tasks(void)

{

	int cpu;



	for_each_possible_cpu(cpu) {

		if (!is_min_capacity_cpu(cpu))

			break;



		if (walt_big_tasks(cpu))

			return true;

	}



	return false;

}



/*

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

 * idle. Attempts to pull tasks from other CPUs.
@@ -11781,6 +11796,10 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) 
	u64 curr_cost = 0;

	u64 avg_idle = this_rq->avg_idle;

	bool prefer_spread = prefer_spread_on_idle(this_cpu);

	bool force_lb = (!is_min_capacity_cpu(this_cpu) &&

				silver_has_big_tasks() &&

				(atomic_read(&this_rq->nr_iowait) == 0));





	if (cpu_isolated(this_cpu))

		return 0;
@@ -11797,7 +11816,7 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) 
	if (!cpu_active(this_cpu))

		return 0;



	if (prefer_spread)

	if (force_lb || prefer_spread)

		avg_idle = ULLONG_MAX;

	/*

	 * This is OK, because current is on_cpu, which avoids it being picked
@@ -11832,7 +11851,7 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf) 
		if (!(sd->flags & SD_LOAD_BALANCE))

			continue;



		if (prefer_spread &&

		if (prefer_spread && !force_lb &&

			(sd->flags & SD_ASYM_CPUCAPACITY) &&

			!is_asym_cap_cpu(this_cpu))

			avg_idle = this_rq->avg_idle;