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| author | Alison Chaiken <achaiken@aurora.tech> | 2022-01-12 00:32:51 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-02-02 02:19:17 +0100 |
| commit | 54577e23fa0791599db1a3d86fc8e7a205d3da75 (patch) | |
| tree | 45a5c6990fa69a5e792619ad377e6c412a70a629 /kernel/rcu | |
| parent | rcu: Move kthread_prio bounds-check to a separate function (diff) | |
| download | linux-54577e23fa0791599db1a3d86fc8e7a205d3da75.tar.xz linux-54577e23fa0791599db1a3d86fc8e7a205d3da75.zip | |
rcu: Make priority of grace-period thread consistent
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>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree_nocb.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 1e40519d1a05..ea889cbfc3b9 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -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); |