Messages in this thread Patch in this message | | | Date | Tue, 18 Aug 2020 12:51:09 +0200 | From | Peter Zijlstra <> | Subject | [RFC][PATCH v2 07/10] sched/fair: Exclude the current CPU from find_new_ilb() |
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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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