Merge "sched: Don't active migrate tasks to CPUs in the same cluster" (6ed51e0b) · Commits · e / devices / android_kernel_sony_msm8998

kernel/sched/fair.c

+11 −1

Original line number	Diff line number	Diff line
		@@ -3536,6 +3536,16 @@ kick_active_balance(struct rq rq, struct task_struct p, int new_cpu)

		static DEFINE_RAW_SPINLOCK(migration_lock);

		static bool do_migration(int reason, int new_cpu, int cpu)
		{
		if ((reason == UP_MIGRATION \|\| reason == DOWN_MIGRATION)
		&& same_cluster(new_cpu, cpu))
		return false;

		/* Inter cluster high irqload migrations are OK */
		return new_cpu != cpu;
		}

		/*
		* Check if currently running task should be migrated to a better cpu.
		*
		@@ -3553,7 +3563,7 @@ void check_for_migration(struct rq rq, struct task_struct p)
		raw_spin_lock(&migration_lock);
		new_cpu = select_best_cpu(p, cpu, reason, 0);

		if (new_cpu != cpu) {
		if (do_migration(reason, new_cpu, cpu)) {
		active_balance = kick_active_balance(rq, p, new_cpu);
		if (active_balance)
		mark_reserved(new_cpu);