Commit b1433395 authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

sched,rcuperf: Convert to sched_set_fifo_low() 



Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

Effectively no change.

Cc: paulmck@kernel.org
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 93db9129

kernel/rcu/rcuperf.c

+2 −6
Original line number Diff line number Diff line
@@ -354,7 +354,6 @@ rcu_perf_writer(void *arg) 
	int i_max;

	long me = (long)arg;

	struct rcu_head *rhp = NULL;

	struct sched_param sp;

	bool started = false, done = false, alldone = false;

	u64 t;

	u64 *wdp;
@@ -363,8 +362,7 @@ rcu_perf_writer(void *arg) 
	VERBOSE_PERFOUT_STRING("rcu_perf_writer task started");

	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);

	sched_set_fifo_low(current);



	if (holdoff)

		schedule_timeout_uninterruptible(holdoff * HZ);
@@ -420,9 +418,7 @@ retry: 
			started = true;

		if (!done && i >= MIN_MEAS) {

			done = true;

			sp.sched_priority = 0;

			sched_setscheduler_nocheck(current,

						   SCHED_NORMAL, &sp);

			sched_set_normal(current, 0);

			pr_alert("%s%s rcu_perf_writer %ld has %d measurements\n",

				 perf_type, PERF_FLAG, me, MIN_MEAS);

			if (atomic_inc_return(&n_rcu_perf_writer_finished) >=

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