sched/fair: Optimize select_idle_cpu

commit 60588bf upstream.

select_idle_cpu() will scan the LLC domain for idle CPUs,
it's always expensive. so the next commit :

	1ad3aaf ("sched/core: Implement new approach to scale select_idle_cpu()")

introduces a way to limit how many CPUs we scan.

But it consume some CPUs out of 'nr' that are not allowed
for the task and thus waste our attempts. The function
always return nr_cpumask_bits, and we can't find a CPU
which our task is allowed to run.

Cpumask may be too big, similar to select_idle_core(), use
per_cpu_ptr 'select_idle_mask' to prevent stack overflow.

Fixes: 1ad3aaf ("sched/core: Implement new approach to scale select_idle_cpu()")
Signed-off-by: Cheng Jian <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Srikar Dronamraju <[email protected]>
Reviewed-by: Vincent Guittot <[email protected]>
Reviewed-by: Valentin Schneider <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yang Wei <[email protected]>
Tested-by: Yang Wei <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit 7308b7bd678d408ee4c97ee78dd08d097ad45607)

Conflicts:
	kernel/sched/fair.c

Reviewed-by: Chris Hyser <[email protected]>

Author: Cheng Jian

kernel/sched/fair.c

@@ -5821,6 +5821,7 @@ static inline int select_idle_smt(struct task_struct *p, struct sched_domain *sd
  */
 static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int target)
 {
+	struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_idle_mask);
 	struct sched_domain *this_sd;
 	u64 avg_cost, avg_idle;
 	u64 time, cost;
@@ -5863,12 +5864,11 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
 
 	time = local_clock();
 
-	for_each_cpu_wrap(cpu, sched_domain_span(sd), target_tmp) {
-		per_cpu(next_cpu, target) = cpu;
+	cpumask_and(cpus, sched_domain_span(sd), &p->cpus_allowed);
+
+	for_each_cpu_wrap(cpu, cpus, target) {
 		if (!--nr)
 			return -1;
-		if (!cpumask_test_cpu(cpu, &p->cpus_allowed))
-			continue;
 		if (idle_cpu(cpu))
 			break;
 	}