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

Paul E. McKenney
2008-06-22T20:06:53Z

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@linux.vnet.ibm.com>
---

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);
}

/*