diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-20 12:18:11 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-08-29 09:20:48 -0700 |
| commit | fecad5091f35425246316ab25c8a9f2aa44a7051 (patch) | |
| tree | 5c0eefc5d89637a64bbb43f0bde6abee71075906 /kernel/rcu/rcutorture.c | |
| parent | 1e69676592edaf81eed88ba53f5239d84fae4e67 (diff) | |
rcutorture: Reduce priority of forward-progress testing
On !SMP tests, the forward-progress kthread might prevent RCU's
grace-period kthread from running, which would defeat RCU's
forward-progress measures. On PREEMPT tests without RCU priority
boosting, the forward-progress kthread might preempt a reader for an
extended time period, which would also defeat RCU's forward-progress
measures. This commit therefore reduced rcutorture's forward-progress
kthread's priority in those cases.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/rcutorture.c')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 9622192ec5c9..ac487ea8d245 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1710,6 +1710,8 @@ static int rcu_torture_fwd_prog(void *args) static DEFINE_TORTURE_RANDOM(trs); VERBOSE_TOROUT_STRING("rcu_torture_fwd_progress task started"); + if (!IS_ENABLED(CONFIG_SMP) || !IS_ENABLED(CONFIG_RCU_BOOST)) + set_user_nice(current, MAX_NICE); if (cur_ops->call && cur_ops->sync && cur_ops->cb_barrier) { init_rcu_head_on_stack(&fcs.rh); cur_ops->call(&fcs.rh, rcu_torture_fwd_prog_cb); |