linux-kernel - [PATCH tip/core/rcu 43/55] rcu: Make rcu_torture

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Message-Id: <1315332049-2604-43-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Tue,  6 Sep 2011 11:00:37 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org, "Paul E. McKenney" <paul.mckenney@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 43/55] rcu: Make rcu_torture_boost() exit loops at end of test

From: Paul E. McKenney <paul.mckenney@...aro.org>

One of the loops in rcu_torture_boost() fails to check kthread_should_stop(),
and thus might be slowing or even stopping completion of rcutorture tests
at rmmod time.  This commit adds the kthread_should_stop() check to the
offending loop.

Signed-off-by: Paul E. McKenney <paul.mckenney@...aro.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcutorture.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index eb739c0..76fe893 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -779,7 +779,8 @@ static int rcu_torture_boost(void *arg)
 		 * interval.  Besides, we are running at RT priority,
 		 * so delays should be relatively rare.
 		 */
-		while (oldstarttime == boost_starttime) {
+		while (oldstarttime == boost_starttime &&
+		       !kthread_should_stop()) {
 			if (mutex_trylock(&boost_mutex)) {
 				boost_starttime = jiffies +
 						  test_boost_interval * HZ;
-- 
1.7.3.2

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