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Commit d27b332b authored by Lingutla Chandrasekhar's avatar Lingutla Chandrasekhar Committed by Gerrit - the friendly Code Review server
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Sched/fair: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: I1a81a1ae808dedea6fd658eadda8fc3f0d3db0a1
Signed-off-by: default avatarLingutla Chandrasekhar <clingutla@codeaurora.org>
parent 9aaa4fce

kernel/sched/fair.c

+15 −19
Original line number Diff line number Diff line
@@ -8094,9 +8094,23 @@ static int find_energy_efficient_cpu(struct sched_domain *sd, 
		/* Find a cpu with sufficient capacity */

		target_cpu = find_best_target(p, &eenv->cpu[EAS_CPU_BKP].cpu_id,

					      boosted, prefer_idle, &fbt_env);

		if (target_cpu < 0)

			goto out;



		/* Immediately return a found idle CPU for a prefer_idle task */

		if (prefer_idle && target_cpu >= 0 && idle_cpu(target_cpu))

		if (prefer_idle && idle_cpu(target_cpu))

			goto out;



#ifdef CONFIG_SCHED_WALT

		if (!walt_disabled && sysctl_sched_use_walt_cpu_util &&

		    p->state == TASK_WAKING)

			delta = task_util(p);

#endif

		if (task_placement_boost_enabled(p) || need_idle ||

		    (rtg_target && (!cpumask_test_cpu(prev_cpu, rtg_target) ||

		    cpumask_test_cpu(target_cpu, rtg_target))) ||

		    __cpu_overutilized(prev_cpu, delta) ||

		    !task_fits_max(p, prev_cpu) || cpu_isolated(prev_cpu))

			goto out;



		/* Place target into NEXT slot */
@@ -8108,10 +8122,6 @@ static int find_energy_efficient_cpu(struct sched_domain *sd, 
		/* take note if no backup was found */

		if (eenv->cpu[EAS_CPU_BKP].cpu_id < 0)

			eenv->max_cpu_count = EAS_CPU_BKP;



		/* take note if no target was found */

		 if (eenv->cpu[EAS_CPU_NXT].cpu_id < 0)

			 eenv->max_cpu_count = EAS_CPU_NXT;

	}



	if (eenv->max_cpu_count == EAS_CPU_NXT) {
@@ -8123,20 +8133,6 @@ static int find_energy_efficient_cpu(struct sched_domain *sd, 
		goto out;

	}



#ifdef CONFIG_SCHED_WALT

	if (!walt_disabled && sysctl_sched_use_walt_cpu_util &&

			p->state == TASK_WAKING)

		delta = task_util(p);

#endif

	if (use_fbt && (task_placement_boost_enabled(p) || fbt_env.need_idle ||

		(rtg_target && (!cpumask_test_cpu(prev_cpu, rtg_target) ||

			cpumask_test_cpu(next_cpu, rtg_target))) ||

		 __cpu_overutilized(prev_cpu, delta) ||

		 !task_fits_max(p, prev_cpu) || cpu_isolated(prev_cpu))) {

		target_cpu = eenv->cpu[EAS_CPU_NXT].cpu_id;

		goto out;

	}



	/* find most energy-efficient CPU */

	target_cpu = select_energy_cpu_idx(eenv) < 0 ? prev_cpu :

					eenv->cpu[eenv->next_idx].cpu_id;