linux-kernel - [PATCH tip/core/rcu 11/17] rcutorture: Increase rcu_read_delay() longdelay

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Message-Id: <20180829214750.26972-11-paulmck@linux.vnet.ibm.com>
Date:   Wed, 29 Aug 2018 14:47:44 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.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.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 11/17] rcutorture: Increase rcu_read_delay() longdelay_ms

RCU now takes certain actions 100 and 200 milliseconds into a grace period
by default, but rcutorture only runs RCU read-side critical sections
with durations up to 50 milliseconds.  This commit therefore increases
test coverage by increasing the maximum critical-section duration to
300 milliseconds.  Note that the existing code automatically dials down
the probability of long delays based on the maximum duration, which means
that this change should not significantly change the rate of execution
of RCU read-side critical sections.

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

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 316083687fd7..b98bb11d47a2 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -323,7 +323,7 @@ static void rcu_read_delay(struct torture_random_state *rrsp)
 	unsigned long started;
 	unsigned long completed;
 	const unsigned long shortdelay_us = 200;
-	const unsigned long longdelay_ms = 50;
+	const unsigned long longdelay_ms = 300;
 	unsigned long long ts;
 
 	/* We want a short delay sometimes to make a reader delay the grace
-- 
2.17.1