Kernel/linux-next
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git synced 2025-01-15 02:05:33 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

rcutorture: Use finer-grained timeouts for rcu_torture_writer() polling

Browse Source 
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 <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
Paul E. McKenney 2024-10-21 07:07:47 -07:00 committed by Uladzislau Rezki (Sony)
parent 579a05da40
commit 7b6c1648bb
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
kernel/rcu/rcutorture.c
View File

@ -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: