Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH rcu 06/10] rcu: Make priority of grace-period thread consistent | Date | Fri, 4 Feb 2022 15:24:02 -0800 |
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From: Alison Chaiken <achaiken@aurora.tech>
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> --- kernel/rcu/tree_nocb.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 1e40519d1a05a..ea889cbfc3b95 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); -- 2.31.1.189.g2e36527f23
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