From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 26 Feb 2014 20:14:51 +0000 (-0800)
Subject: torture: Intensify locking test
X-Git-Tag: next-20140516~31^2~11^3~38
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=da601c63fd3a3e6c30f85eefd5ee46397b5b439d;p=karo-tx-linux.git

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 f26b1a18e34e..b0d3e3c50672 100644
--- 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++;