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Commit 2094c995 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcutorture: Set rcuperf writer kthreads to real-time priority 



This commit forces more deterministic update-side behavior by setting
rcuperf's rcu_perf_writer() kthreads to real-time priority.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 6b558c4c

kernel/rcu/rcuperf.c

+3 −0
Original line number Diff line number Diff line
@@ -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;