From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
---
kernel/rcu/update.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 9ea2a26487c5..43ea9c37bbd0 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -465,6 +465,8 @@ EXPORT_SYMBOL_GPL(rcu_barrier_tasks);
static void check_holdout_task(struct task_struct *t,
bool needreport, bool *firstreport)
{
+ int cpu;
+
if (!ACCESS_ONCE(t->rcu_tasks_holdout))
goto not_holdout; /* Other detection of non-holdout status. */
if (t->rcu_tasks_nvcsw != ACCESS_ONCE(t->nvcsw))
@@ -475,8 +477,6 @@ static void check_holdout_task(struct task_struct *t,
!is_idle_task(t) && t->rcu_tasks_idle_cpu >= 0)
goto not_holdout; /* NO_HZ_FULL userspace execution. */
if (is_idle_task(t)) {
- int cpu;
-
cpu = task_cpu(t);
if (cpu >= 0 && cpu_curr(cpu) != t)
goto not_holdout; /* Idle task not running. */
@@ -499,6 +499,12 @@ static void check_holdout_task(struct task_struct *t,
pr_err("INFO: rcu_tasks detected stalls on tasks:\n");
*firstreport = false;
}
+ cpu = task_cpu(t);
+ pr_alert("%p: %c%c nvcsw: %lu/%lu holdout: %d idle_cpu: %d/%d\n",
+ t, ".I"[is_idle_task(t)],
+ "N."[cpu < 0 || !tick_nohz_full_cpu(cpu)],
+ t->rcu_tasks_nvcsw, t->nvcsw, t->rcu_tasks_holdout,
+ t->rcu_tasks_idle_cpu, cpu);
sched_show_task(t);
return;
not_holdout:
--
1.8.1.5
--
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