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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>
This commit is contained in:
Paul E. McKenney 2012-05-29 17:50:51 -07:00 committed by Paul E. McKenney
parent 143aa672f4
commit 72472a02a9
1 changed files with 5 additions and 1 deletions
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6
kernel/rcutorture.c
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@ -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);