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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-08-10 19:47:12 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-07 16:27:33 -0700 |
| commit | 4ff475ed4cf61a7f56bbfbc424147189d0022b38 (patch) | |
| tree | 1bee8dc0f61100f54b92d547f8772649c5eafc56 /kernel/rcu/update.c | |
| parent | 01a81330344b09028881c953a51d1106a9e63518 (diff) | |
| download | linux-stable-4ff475ed4cf61a7f56bbfbc424147189d0022b38.tar.gz linux-stable-4ff475ed4cf61a7f56bbfbc424147189d0022b38.tar.bz2 linux-stable-4ff475ed4cf61a7f56bbfbc424147189d0022b38.zip | |
rcu: Additional information on RCU-tasks stall-warning messages
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/update.c')
| -rw-r--r-- | kernel/rcu/update.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index f86d1ae50005..9487b4898e51 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 @@ -461,6 +462,8 @@ 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) || @@ -477,6 +480,12 @@ 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); } |