linux-kernel - [PATCH rcu 09/14] rcuscale: Make all writer tasks report upon hang

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Message-Id: <20240816070256.60993-9-neeraj.upadhyay@kernel.org>
Date: Fri, 16 Aug 2024 12:32:51 +0530
From: neeraj.upadhyay@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	paulmck@...nel.org,
	neeraj.upadhyay@...nel.org,
	neeraj.upadhyay@....com,
	boqun.feng@...il.com,
	joel@...lfernandes.org,
	urezki@...il.com,
	frederic@...nel.org
Subject: [PATCH rcu 09/14] rcuscale: Make all writer tasks report upon hang

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

This commit causes all writer tasks to provide a brief report after a
hang has been reported, spaced at one-second intervals.

Signed-off-by: "Paul E. McKenney" <paulmck@...nel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
---
 kernel/rcu/rcuscale.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c
index 79e1c32d5c0f..dfe8e0faa4d8 100644
--- a/kernel/rcu/rcuscale.c
+++ b/kernel/rcu/rcuscale.c
@@ -483,6 +483,7 @@ rcu_scale_writer(void *arg)
 	unsigned long jdone;
 	long me = (long)arg;
 	struct rcu_head *rhp = NULL;
+	bool selfreport = false;
 	bool started = false, done = false, alldone = false;
 	u64 t;
 	DEFINE_TORTURE_RANDOM(tr);
@@ -593,6 +594,11 @@ rcu_scale_writer(void *arg)
 					cur_ops->stats();
 			}
 		}
+		if (!selfreport && time_after(jiffies, jdone + HZ * (70 + me))) {
+			pr_info("%s: Writer %ld self-report: started %d done %d/%d->%d i %d jdone %lu.\n",
+				__func__, me, started, done, writer_done[me], atomic_read(&n_rcu_scale_writer_finished), i, jiffies - jdone);
+			selfreport = true;
+		}
 		if (started && !alldone && i < MAX_MEAS - 1)
 			i++;
 		rcu_scale_wait_shutdown();
-- 
2.40.1