Commit-ID: 72472a02a9c4507ef54d03d71bb253c26015f52c
Gitweb: http://git.kernel.org/tip/72472a02a9c4507ef54d03d71bb253c26015f52c
Author: Paul E. McKenney <paul.mckenney@xxxxxxxxxx>
AuthorDate: Tue, 29 May 2012 17:50:51 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 2 Jul 2012 12:34:04 -0700
rcu: Make rcutorture fakewriters invoke rcu_barrier()
The current rcutorture rcu_barrier() testing never intentionally runs
more than one instance of rcu_barrier() at a given time. This fails
to test the the shiny new concurrency features of rcu_barrier(). This
commit therefore modifies the rcutorture fakewriter kthread to randomly
invoke rcu_barrier() rather than the usual synchronize_rcu().
Signed-off-by: Paul E. McKenney <paul.mckenney@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcutorture.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 045a3dc..c279ee9 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -1025,7 +1025,11 @@ rcu_torture_fakewriter(void *arg)
do {
schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10);
udelay(rcu_random(&rand) & 0x3ff);
- cur_ops->sync();
+ if (cur_ops->cb_barrier != NULL &&
+ rcu_random(&rand) % (nfakewriters * 8) == 0)
+ cur_ops->cb_barrier();
+ else
+ cur_ops->sync();
rcu_stutter_wait("rcu_torture_fakewriter");
} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
--
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