Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 13/17] rcutorture: Reduce priority of forward-progress testing | Date | Wed, 29 Aug 2018 14:47:46 -0700 |
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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> --- kernel/rcu/rcutorture.c | 2 ++ 1 file changed, 2 insertions(+)
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); -- 2.17.1
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