From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com> Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com> --- kernel/rcu/update.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 2130f0597771..ede5dbe77bcf 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -48,6 +48,7 @@ #include <linux/delay.h> #include <linux/module.h> #include <linux/kthread.h> +#include <linux/tick.h> #define CREATE_TRACE_POINTS @@ -464,6 +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) || t->rcu_tasks_nvcsw != ACCESS_ONCE(t->nvcsw) || !ACCESS_ONCE(t->on_rq) || @@ -480,6 +483,12 @@ 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); } -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/