From: Wanpeng Li <wanpengli@xxxxxxxxxxx>
Consider the task afffinity constrain when yield to a task.
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Wanpeng Li <wanpengli@xxxxxxxxxxx>
---
kernel/sched/core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 092f7c4..11001ff 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5102,6 +5102,9 @@ int __sched yield_to(struct task_struct *p, bool preempt)
if (task_running(p_rq, p) || p->state)
goto out_unlock;
+ if (!cpumask_test_cpu(smp_processor_id(), &p->cpus_allowed))
+ goto out_unlock;
+
yielded = curr->sched_class->yield_to_task(rq, p, preempt);
if (yielded) {
schedstat_inc(rq->yld_count);
--
2.7.4
