torture: Intensify locking test

The current lock_torture_writer() spends too much time sleeping and not
enough time hammering locks, as in an eight-CPU test will often only be
utilizing a CPU or two.  This commit therefore makes lock_torture_writer()
sleep less and hammer more.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index f26b1a18e34e03cb0582fbf2de16d008f9731d89..b0d3e3c5067286f37fa5abe5663025390a7ed53b 100644 (file)
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -219,7 +219,8 @@ static int lock_torture_writer(void *arg)
        set_user_nice(current, 19);
 
        do {
-               schedule_timeout_uninterruptible(1);
+               if ((torture_random(&rand) & 0xfffff) == 0)
+                       schedule_timeout_uninterruptible(1);
                cur_ops->writelock();
                if (WARN_ON_ONCE(lock_is_write_held))
                        lwsp->n_write_lock_fail++;