rcu, rcutorture: make quiescent rcutorture less power-hungry

Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: josh@freedesktop.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: dino@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: torvalds@linux-foundation.org
Cc: vegard.nossum@gmail.com
Cc: adobriyan@gmail.com
Cc: oleg@tv-sign.ru
Cc: bunk@kernel.org
Cc: rjw@sisk.pl
Signed-off-by: NIngo Molnar <mingo@elte.hu>

kernel/rcutorture.c

@@ -196,7 +196,10 @@ static void
 rcu_stutter_wait(void)
 {
 	while (stutter_pause_test || !rcutorture_runnable)
-		schedule_timeout_interruptible(1);
+		if (rcutorture_runnable)
+			schedule_timeout_interruptible(1);
+		else
+			schedule_timeout_interruptible(HZ);
 }
 
 /*