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

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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2014-08-10 19:47:12 -07:00
parent 01a8133034
commit 4ff475ed4c
1 changed files with 9 additions and 0 deletions
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9
kernel/rcu/update.c
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@ -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);
} }