linux-kernel - [PATCH v6 tip/core/rcu 15/17] rcu: Additional information on RCU-tasks stall-warning messages

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Message-Id: <1408120125-30479-15-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Fri, 15 Aug 2014 09:28:43 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH v6 tip/core/rcu 15/17] rcu: Additional information on RCU-tasks stall-warning messages

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>

Signed-off-by: Paul E. McKenney <paulmck@...ux.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

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