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Commit d3af3450 authored by Lingutla Chandrasekhar's avatar Lingutla Chandrasekhar
Browse files

sched: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: I19691e08e344112acca89493b83340c2228bbaca
Signed-off-by: default avatarLingutla Chandrasekhar <clingutla@codeaurora.org>
parent c6d9ce6c

kernel/sched/fair.c

+5 −8
Original line number Diff line number Diff line
@@ -6717,7 +6717,6 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus, 
	unsigned long target_capacity = ULONG_MAX;

	unsigned long min_wake_util = ULONG_MAX;

	unsigned long target_max_spare_cap = 0;

	unsigned long target_util = ULONG_MAX;

	unsigned long best_active_util = ULONG_MAX;

	unsigned long best_active_cuml_util = ULONG_MAX;

	unsigned long best_idle_cuml_util = ULONG_MAX;
@@ -6810,7 +6809,7 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus, 
			 */

			wake_util = cpu_util_without(i, p);

			new_util = wake_util + task_util_est(p);

			spare_wake_cap = capacity_orig_of(i) - wake_util;

			spare_wake_cap = capacity_orig - wake_util;



			if (spare_wake_cap > most_spare_wake_cap) {

				most_spare_wake_cap = spare_wake_cap;
@@ -6982,17 +6981,16 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus, 
			 */

			if (idle_cpu(i)) {

				/*

				 * Skip CPUs in deeper idle state, but only

				 * if they are also less energy efficient.

				 * IOW, prefer a deep IDLE LITTLE CPU vs a

				 * shallow idle big CPU.

				 * Prefer shallowest over deeper idle state cpu,

				 * of same capacity cpus.

				 */

				if (capacity_orig >= target_capacity &&

				if (capacity_orig == target_capacity &&

				    sysctl_sched_cstate_aware &&

				    idle_idx > shallowest_idle_cstate)

					continue;



				if (shallowest_idle_cstate == idle_idx &&

					target_capacity == capacity_orig &&

					(best_idle_cpu == prev_cpu ||

					(i != prev_cpu &&

					new_util_cuml > best_idle_cuml_util)))
@@ -7040,7 +7038,6 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus, 


			target_max_spare_cap = spare_cap;

			target_capacity = capacity_orig;

			target_util = new_util;

			target_cpu = i;

		}