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Subject[RFC][PATCH v2 07/10] sched/fair: Exclude the current CPU from find_new_ilb()
It is possible for find_new_ilb() to select the current CPU, however,
this only happens from newidle balancing, in which case need_resched()
will be true, and consequently nohz_csd_func() will not trigger the
softirq.

Exclude the current CPU from becoming an ILB target.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/fair.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10026,6 +10026,10 @@ static inline int find_new_ilb(void)

for_each_cpu_and(ilb, nohz.idle_cpus_mask,
housekeeping_cpumask(HK_FLAG_MISC)) {
+
+ if (ilb == smp_processor_id())
+ continue;
+
if (idle_cpu(ilb))
return ilb;
}

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