sched/fair: Optimize select_idle_cpu

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

	1ad3aaf3fcd2 ("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: 1ad3aaf3fcd2 ("sched/core: Implement new approach to scale select_idle_cpu()")
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20191213024530.28052-1-cj.chengjian@huawei.com

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 846f50bd0c0bb5d3a9ee9e27cd50dcbcadfacb4e..280d54ccb4bed6503a22b267a996a812d4432304 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5828,6 +5828,7 @@ static inline int select_idle_smt(struct task_struct *p, int target)
  */
 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;
@@ -5859,11 +5860,11 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
 
        time = cpu_clock(this);
 
-       for_each_cpu_wrap(cpu, sched_domain_span(sd), target) {
+       cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr);
+
+       for_each_cpu_wrap(cpu, cpus, target) {
                if (!--nr)
                        return si_cpu;
-               if (!cpumask_test_cpu(cpu, p->cpus_ptr))
-                       continue;
                if (available_idle_cpu(cpu))
                        break;
                if (si_cpu == -1 && sched_idle_cpu(cpu))