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Commit 452a5e39 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched/fair: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: I666852913033422d31352aa297e7afbd7eb064b8
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent eca47d45

kernel/sched/fair.c

+13 −0
Original line number Diff line number Diff line
@@ -9742,6 +9742,19 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd 
			sgs->group_type = group_classify(sg, sgs);

		}



		/*

		 * Disallow moving tasks from asym cap sibling CPUs to other

		 * CPUs (lower capacity) unless the asym cap sibling group has

		 * no capacity to manage the current load.

		 */

		if ((env->sd->flags & SD_ASYM_CPUCAPACITY) &&

			sgs->group_no_capacity &&

			asym_cap_sibling_group_has_capacity(env->dst_cpu,

						env->sd->imbalance_pct)) {

			sgs->group_no_capacity = 0;

			sgs->group_type = group_classify(sg, sgs);

		}



		if (update_sd_pick_busiest(env, sds, sg, sgs)) {

			sds->busiest = sg;

			sds->busiest_stat = *sgs;

kernel/sched/sched.h

+34 −0
Original line number Diff line number Diff line
@@ -2699,6 +2699,35 @@ static inline int asym_cap_siblings(int cpu1, int cpu2) 
		cpumask_test_cpu(cpu2, &asym_cap_sibling_cpus));

}



static inline bool asym_cap_sibling_group_has_capacity(int dst_cpu, int margin)

{

	int sib1, sib2;

	int nr_running;

	unsigned long total_util, total_capacity;



	if (cpumask_empty(&asym_cap_sibling_cpus) ||

			cpumask_test_cpu(dst_cpu, &asym_cap_sibling_cpus))

		return false;



	sib1 = cpumask_first(&asym_cap_sibling_cpus);

	sib2 = cpumask_last(&asym_cap_sibling_cpus);



	if (!cpu_active(sib1) || cpu_isolated(sib1) ||

		!cpu_active(sib2) || cpu_isolated(sib2))

		return false;



	nr_running = cpu_rq(sib1)->cfs.h_nr_running +

			cpu_rq(sib2)->cfs.h_nr_running;



	if (nr_running <= 2)

		return true;



	total_capacity = capacity_of(sib1) + capacity_of(sib2);

	total_util = cpu_util(sib1) + cpu_util(sib2);



	return ((total_capacity * 100) > (total_util * margin));

}



static inline int cpu_max_possible_capacity(int cpu)

{

	return cpu_rq(cpu)->cluster->max_possible_capacity;
@@ -2978,6 +3007,11 @@ static inline struct sched_cluster *rq_cluster(struct rq *rq) 


static inline int asym_cap_siblings(int cpu1, int cpu2) { return 0; }



static inline bool asym_cap_sibling_group_has_capacity(int dst_cpu, int margin)

{

	return false;

}



static inline void set_preferred_cluster(struct related_thread_group *grp) { }



static inline bool task_in_related_thread_group(struct task_struct *p)