linux-kernel - [PATCH 05/48] rcutorture: Dump # online CPUs on insufficient cb-flood laundering

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Message-Id: <20240507093530.3043-6-urezki@gmail.com>
Date: Tue,  7 May 2024 11:34:47 +0200
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: "Paul E . McKenney" <paulmck@...nel.org>
Cc: RCU <rcu@...r.kernel.org>,
	Neeraj upadhyay <Neeraj.Upadhyay@....com>,
	Boqun Feng <boqun.feng@...il.com>,
	Hillf Danton <hdanton@...a.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
	Frederic Weisbecker <frederic@...nel.org>
Subject: [PATCH 05/48] rcutorture: Dump # online CPUs on insufficient cb-flood laundering

From: "Paul E. McKenney" <paulmck@...nel.org>

This commit adds the number of online CPUs to the state dump following
an unsuccesful callback-flood test.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 kernel/rcu/rcutorture.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 45d6b4c3d199..6611ef3e71c3 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2833,12 +2833,12 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp)
 	if (!torture_must_stop() && !READ_ONCE(rcu_fwd_emergency_stop) &&
 	    !shutdown_time_arrived()) {
 		WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED);
-		pr_alert("%s Duration %lu barrier: %lu pending %ld n_launders: %ld n_launders_sa: %ld n_max_gps: %ld n_max_cbs: %ld cver %ld gps %ld\n",
+		pr_alert("%s Duration %lu barrier: %lu pending %ld n_launders: %ld n_launders_sa: %ld n_max_gps: %ld n_max_cbs: %ld cver %ld gps %ld #online %u\n",
 			 __func__,
 			 stoppedat - rfp->rcu_fwd_startat, jiffies - stoppedat,
 			 n_launders + n_max_cbs - n_launders_cb_snap,
 			 n_launders, n_launders_sa,
-			 n_max_gps, n_max_cbs, cver, gps);
+			 n_max_gps, n_max_cbs, cver, gps, num_online_cpus());
 		atomic_long_add(n_max_cbs, &rcu_fwd_max_cbs);
 		mutex_lock(&rcu_fwd_mutex); // Serialize histograms.
 		rcu_torture_fwd_cb_hist(rfp);
-- 
2.39.2