rcu: make quiescent rcutorture less power-hungry

This patch aligns the rcutorture wakeup times to align with all other
multiple-of-a-second wakeups to further decrease power consumption.

Suggested-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Paul 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: Ingo Molnar <mingo@elte.hu>

kernel/rcutorture.c

@@ -199,7 +199,7 @@ rcu_stutter_wait(void)
 		if (rcutorture_runnable)
 			schedule_timeout_interruptible(1);
 		else
-			schedule_timeout_interruptible(HZ);
+			schedule_timeout_interruptible(round_jiffies_relative(HZ));
 }
 
 /*