[PATCH -tip-rcu] Make rcutorture more vicious: make quiescent rcutorture less power-hungry

[Paul E. McKenney]

This patch makes the non-module rcutorture a bit more friendly to
the power-conservation code.  This is a rather simple-minded approach.
More sophisticated approaches would get rid of the rcutorture tasks
while rcutorture execution was suppressed, but attempts thus far to
do this have not gone well -- calling rcu_torture_init() from a /proc
callout results in oopses.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---

 rcutorture.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff -urpNa -X dontdiff linux-2.6.26-rc4-rcut2-proc/kernel/rcutorture.c linux-2.6.26-rc4-rcut3-procq/kernel/rcutorture.c
--- linux-2.6.26-rc4-rcut2-proc/kernel/rcutorture.c	2008-06-22 10:29:04.000000000 -0700
+++ linux-2.6.26-rc4-rcut3-procq/kernel/rcutorture.c	2008-06-22 12:20:10.000000000 -0700
@@ -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);
 }
 
 /*
--
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