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    Subject[PATCH tip/core/rcu 13/17] rcutorture: Reduce priority of forward-progress testing
    Date
    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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