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rcu: Make priority of grace-period thread consistent

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The priority of RCU grace period threads is set to kthread_prio when
they are launched from rcu_spawn_gp_kthread().  The same is not true
of rcu_spawn_one_nocb_kthread().  Accordingly, add priority elevation
to rcu_spawn_one_nocb_kthread().

Signed-off-by: Alison Chaiken <achaiken@aurora.tech>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Alison Chaiken 2022-01-11 15:32:51 -08:00 committed by Paul E. McKenney
parent c8db27dd0e
commit 54577e23fa
1 changed files with 4 additions and 0 deletions
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4
kernel/rcu/tree_nocb.h
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@ -1239,6 +1239,7 @@ static void rcu_spawn_cpu_nocb_kthread(int cpu)
struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
struct rcu_data *rdp_gp;
struct task_struct *t;
struct sched_param sp;
if (!rcu_scheduler_fully_active || !rcu_nocb_is_setup)
return;
@ -1248,6 +1249,7 @@ static void rcu_spawn_cpu_nocb_kthread(int cpu)
return;
/* If we didn't spawn the GP kthread first, reorganize! */
sp.sched_priority = kthread_prio;
rdp_gp = rdp->nocb_gp_rdp;
mutex_lock(&rdp_gp->nocb_gp_kthread_mutex);
if (!rdp_gp->nocb_gp_kthread) {
@ -1258,6 +1260,8 @@ static void rcu_spawn_cpu_nocb_kthread(int cpu)
return;
}
WRITE_ONCE(rdp_gp->nocb_gp_kthread, t);
if (kthread_prio)
sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
}
mutex_unlock(&rdp_gp->nocb_gp_kthread_mutex);