Merge "sched: Distinguish between idle and active high power CPUs for small tasks" (7549c10e) · Commits · e / devices / samsung / android_kernel_samsung_msm8916

kernel/sched/fair.c

+15 −1

Original line number	Diff line number	Diff line
		@@ -1703,6 +1703,8 @@ static int best_small_task_cpu(struct task_struct *p, int sync)
		int best_mi_cpu = -1, best_mi_cpu_power = INT_MAX;
		int best_idle_lowpower_cpu = -1,
		best_idle_lowpower_cpu_cstate = INT_MAX;
		int best_idle_highpower_cpu = -1,
		best_idle_highpower_cpu_cstate = INT_MAX;
		int best_busy_lowpower_cpu = -1;
		u64 best_busy_lowpower_cpu_load = ULLONG_MAX;
		int best_busy_highpower_cpu = -1;
		@@ -1746,7 +1748,8 @@ static int best_small_task_cpu(struct task_struct *p, int sync)
		* 2. Shallowest c-state idle CPU in little cluster.
		* 3. Least busy CPU in little cluster where adding the task
		* won't cross spill.
		* 4. Least busy CPU outside little cluster.
		* 4. Least busy non-idle CPU outside little cluster.
		* 5. Shallowest c-state idle CPU outside little cluster.
		*/
		for_each_cpu(i, &search_cpus) {
		struct rq *rq = cpu_rq(i);
		@@ -1772,6 +1775,15 @@ static int best_small_task_cpu(struct task_struct *p, int sync)
		*/
		load = cpu_load_sync(i, sync);
		if (power_delta_exceeded(cost_list[i], min_cost)) {

		if (idle_cpu(i) && cstate) {
		if (cstate < best_idle_highpower_cpu_cstate) {
		best_idle_highpower_cpu = i;
		best_idle_highpower_cpu_cstate = cstate;
		}
		continue;
		}

		if (load < best_busy_highpower_cpu_load) {
		best_busy_highpower_cpu = i;
		best_busy_highpower_cpu_load = load;
		@@ -1815,6 +1827,8 @@ static int best_small_task_cpu(struct task_struct *p, int sync)
		return best_busy_lowpower_cpu;
		if (best_busy_highpower_cpu != -1)
		return best_busy_highpower_cpu;
		if (best_idle_highpower_cpu != -1)
		return best_idle_highpower_cpu;

		return task_cpu(p);
		}