Merge "sched: treat sync waker CPUs with 1 task as idle" (3c85aeae) · Commits · e / devices / android_kernel_sony_msm8994

kernel/sched/fair.c

+8 −2

Original line number	Original line	Diff line number	Diff line
	@@ -1914,6 +1914,7 @@ static int select_best_cpu(struct task_struct *p, int target, int reason,
	int boost = sched_boost();		int boost = sched_boost();
	int cstate, min_cstate = INT_MAX;		int cstate, min_cstate = INT_MAX;
	int prefer_idle = reason ? 1 : sysctl_sched_prefer_idle;		int prefer_idle = reason ? 1 : sysctl_sched_prefer_idle;
			int curr_cpu = smp_processor_id();

	trace_sched_task_load(p, small_task, boost, reason, sync, prefer_idle);		trace_sched_task_load(p, small_task, boost, reason, sync, prefer_idle);

	@@ -1979,9 +1980,14 @@ static int select_best_cpu(struct task_struct *p, int target, int reason,
	/*		/*
	* Partition CPUs based on whether they are completely idle		* Partition CPUs based on whether they are completely idle
	* or not. For completely idle CPUs we choose the one in		* or not. For completely idle CPUs we choose the one in
	* the lowest C-state and then break ties with power cost		* the lowest C-state and then break ties with power cost.
			*
			* For sync wakeups we only consider the waker CPU as idle if
			* prefer_idle is set. Otherwise if prefer_idle is unset sync
			* wakeups will get biased away from the waker CPU.
	*/		*/
	if (idle_cpu(i)) {		if (idle_cpu(i) \|\| (sync && i == curr_cpu && prefer_idle &&
			cpu_rq(i)->nr_running == 1)) {
	if (cstate > min_cstate)		if (cstate > min_cstate)
	continue;		continue;