Commit 72472a02 authored May 29, 2012 by Paul E. McKenney Committed by Paul E. McKenney Jul 02, 2012

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

parent 143aa672

kernel/rcutorture.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -1025,6 +1025,10 @@ rcu_torture_fakewriter(void *arg)
		do {
		schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10);
		udelay(rcu_random(&rand) & 0x3ff);
		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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