linux-kernel - [PATCH tip/core/rcu 14/17] rcutorture: Print forward-progress test age upon failure

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Date:   Sun, 11 Nov 2018 12:20:24 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.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,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>
Subject: [PATCH tip/core/rcu 14/17] rcutorture: Print forward-progress test age upon failure

This commit prints the age of the forward-progress test in jiffies,
in order to allow better interpretation of the callback-invocation
histograms.

Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
---
 kernel/rcu/rcutorture.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 329f4fb13125..080b5ac6340c 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1639,7 +1639,8 @@ static void rcu_torture_fwd_cb_hist(void)
 	for (i = ARRAY_SIZE(n_launders_hist) - 1; i > 0; i--)
 		if (n_launders_hist[i] > 0)
 			break;
-	pr_alert("%s: Callback-invocation histogram:", __func__);
+	pr_alert("%s: Callback-invocation histogram (duration %lu jiffies):",
+		 __func__, jiffies - rcu_fwd_startat);
 	for (j = 0; j <= i; j++)
 		pr_cont(" %ds: %ld", j + 1, n_launders_hist[j]);
 	pr_cont("\n");
-- 
2.17.1