The rcu_torture_writer() polling currently uses timeouts ranging from
zero to 16 milliseconds to wait for the polled grace period to end.
This works, but it would be better to have a higher probability of
exercising races with the code that cleans up after a grace period.
This commit therefore switches from these millisecond-scale timeouts
to timeouts ranging from zero to 128 microseconds, and with a full
microsecond's worth of timeout fuzz.
Signed-off-by: Paul E. McKenney <paul...@kernel.org>
---
kernel/rcu/rcutorture.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 0bc6fc5822153..6067f2740247d 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1561,8 +1561,8 @@ rcu_torture_writer(void *arg)
break;
}
WARN_ON_ONCE(ulo_size > 0 && i >=
ulo_size);
-
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
- &rand);
+
torture_hrtimeout_us(torture_random(&rand) % 128, 1000,
+ &rand);
}
rcu_torture_pipe_update(old_rp);
break;
@@ -1582,8 +1582,8 @@ rcu_torture_writer(void *arg)
break;
}
WARN_ON_ONCE(rgo_size > 0 && i >=
rgo_size);
-
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
- &rand);
+
torture_hrtimeout_us(torture_random(&rand) % 128, 1000,
+ &rand);
}
rcu_torture_pipe_update(old_rp);
break;
@@ -1592,8 +1592,8 @@ rcu_torture_writer(void *arg)
gp_snap = cur_ops->start_gp_poll_exp();
rcu_torture_writer_state = RTWS_POLL_WAIT_EXP;
while (!cur_ops->poll_gp_state_exp(gp_snap))
-
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
- &rand);
+
torture_hrtimeout_us(torture_random(&rand) % 128, 1000,
+ &rand);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_POLL_GET_EXP_FULL:
@@ -1601,8 +1601,8 @@ rcu_torture_writer(void *arg)
cur_ops->start_gp_poll_exp_full(&gp_snap_full);
rcu_torture_writer_state =
RTWS_POLL_WAIT_EXP_FULL;
while
(!cur_ops->poll_gp_state_full(&gp_snap_full))
-
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
- &rand);
+
torture_hrtimeout_us(torture_random(&rand) % 128, 1000,
+ &rand);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_SYNC:
--
2.40.1
