The following commit has been merged into the sched/core branch of tip: Commit-ID: 45da7a2b0af8fa29dff2e6ba8926322068350fce Gitweb: https://git.kernel.org/tip/45da7a2b0af8fa29dff2e6ba8926322068350fce Author: Peter Zijlstra <[email protected]> AuthorDate: Tue, 18 Aug 2020 10:48:17 +02:00 Committer: Peter Zijlstra <[email protected]> CommitterDate: Thu, 29 Oct 2020 11:00:30 +01:00
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) <[email protected]> --- kernel/sched/fair.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index b9368d1..cd9a37c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10056,6 +10056,10 @@ 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; }
