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Commit 4ff475ed authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Additional information on RCU-tasks stall-warning messages 



Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 01a81330

kernel/rcu/update.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -48,6 +48,7 @@ 
#include <linux/delay.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/module.h>

#include <linux/kthread.h>

#include <linux/kthread.h>

#include <linux/tick.h>





#define CREATE_TRACE_POINTS

#define CREATE_TRACE_POINTS
@@ -461,6 +462,8 @@ EXPORT_SYMBOL_GPL(rcu_barrier_tasks); 
static void check_holdout_task(struct task_struct *t,

static void check_holdout_task(struct task_struct *t,

			       bool needreport, bool *firstreport)

			       bool needreport, bool *firstreport)

{

{

	int cpu;



	if (!ACCESS_ONCE(t->rcu_tasks_holdout) ||

	if (!ACCESS_ONCE(t->rcu_tasks_holdout) ||

	    t->rcu_tasks_nvcsw != ACCESS_ONCE(t->nvcsw) ||

	    t->rcu_tasks_nvcsw != ACCESS_ONCE(t->nvcsw) ||

	    !ACCESS_ONCE(t->on_rq) ||

	    !ACCESS_ONCE(t->on_rq) ||
@@ -477,6 +480,12 @@ static void check_holdout_task(struct task_struct *t, 
		pr_err("INFO: rcu_tasks detected stalls on tasks:\n");

		pr_err("INFO: rcu_tasks detected stalls on tasks:\n");

		*firstreport = false;

		*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);

	sched_show_task(t);

}

}