This commit forces more deterministic update-side behavior by setting rcuperf's rcu_perf_writer() kthreads to real-time priority.
Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/rcu/rcuperf.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c index 7a1edf417d18..e18d016a9888 100644 --- a/kernel/rcu/rcuperf.c +++ b/kernel/rcu/rcuperf.c @@ -355,6 +355,7 @@ rcu_perf_writer(void *arg) int i = 0; int i_max; long me = (long)arg; + struct sched_param sp; bool started = false, done = false, alldone = false; u64 t; u64 *wdp; @@ -365,6 +366,8 @@ rcu_perf_writer(void *arg) WARN_ON(rcu_gp_is_normal() && gp_exp); WARN_ON(!wdpp); set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); + sp.sched_priority = 1; + sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); t = ktime_get_mono_fast_ns(); if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { t_rcu_perf_writer_started = t; -- 2.5.2
