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Subject[PATCH] sched: Fix rq nr_uninterruptible count
Date
When an uninterrptable task is queue to a differect cpu as where
it is dequeued, the rq nr_uninterruptible will be incorrent, so
fix it.

Signed-off-by: GuoYong Zheng <zhenggy@chinatelecom.cn>
---
kernel/sched/core.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 25b582b..cd5ef6e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4068,6 +4068,7 @@ bool ttwu_state_match(struct task_struct *p, unsigned int state, int *success)
{
unsigned long flags;
int cpu, success = 0;
+ struct rq *src_rq, *dst_rq;

preempt_disable();
if (p == current) {
@@ -4205,6 +4206,16 @@ bool ttwu_state_match(struct task_struct *p, unsigned int state, int *success)
atomic_dec(&task_rq(p)->nr_iowait);
}

+ if (p->sched_contributes_to_load) {
+ src_rq = cpu_rq(task_cpu(p));
+ dst_rq = cpu_rq(cpu);
+
+ double_rq_lock(src_rq, dst_rq);
+ src_rq->nr_uninterruptible--;
+ dst_rq->nr_uninterruptible++;
+ double_rq_unlock(src_rq, dst_rq);
+ }
+
wake_flags |= WF_MIGRATED;
psi_ttwu_dequeue(p);
set_task_cpu(p, cpu);
--
1.8.3.1
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