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Commit 6b558c4c authored by Paul E. McKenney's avatar Paul E. McKenney
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rcutorture: Bind rcuperf reader/writer kthreads to CPUs 



This commit forces more deterministic behavior by binding rcuperf's
rcu_perf_reader() and rcu_perf_writer() kthreads to their respective
CPUs.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent bdea9e34

kernel/rcu/rcuperf.c

+4 −1
Original line number Diff line number Diff line
@@ -328,8 +328,10 @@ rcu_perf_reader(void *arg) 
{

	unsigned long flags;

	int idx;

	long me = (long)arg;



	VERBOSE_PERFOUT_STRING("rcu_perf_reader task started");

	set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));

	set_user_nice(current, MAX_NICE);

	atomic_inc(&n_rcu_perf_reader_started);
@@ -362,6 +364,7 @@ rcu_perf_writer(void *arg) 
	WARN_ON(rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp);

	WARN_ON(rcu_gp_is_normal() && gp_exp);

	WARN_ON(!wdpp);

	set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));

	t = ktime_get_mono_fast_ns();

	if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) {

		t_rcu_perf_writer_started = t;
@@ -594,7 +597,7 @@ rcu_perf_init(void) 
		goto unwind;

	}

	for (i = 0; i < nrealreaders; i++) {

		firsterr = torture_create_kthread(rcu_perf_reader, NULL,

		firsterr = torture_create_kthread(rcu_perf_reader, (void *)i,

						  reader_tasks[i]);

		if (firsterr)

			goto unwind;