[tip: sched/fifo] sched,rcuperf: Convert to sched_set_fifo_low()

[tip-bot2 for Peter Zijlstra]

The following commit has been merged into the sched/fifo branch of tip:

Commit-ID:     b1433395c4cc078b4382429e6d7dd1721714094f
Gitweb:        https://git.kernel.org/tip/b1433395c4cc078b4382429e6d7dd1721714094f
Author:        Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate:    Tue, 21 Apr 2020 12:09:13 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 15 Jun 2020 14:10:24 +02:00

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@xxxxxxxxxx
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 kernel/rcu/rcuperf.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
index 16dd1e6..64249a0 100644
--- a/kernel/rcu/rcuperf.c
+++ b/kernel/rcu/rcuperf.c
@@ -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) >=