From: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
The priority level of the rcuo kthreads is the system administrator's
responsibility, but kernels that priority-boost RCU readers probably need
the rcuo kthreads running at the rcutree.kthread_prio level. This commit
therefore sets these kthreads to that priority level at creation time,
providing a sensible default. The system administrator is free to adjust
as needed at any time.
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Scott Wood <swood@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
kernel/rcu/tree_plugin.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index fca31c6..7e33dae0 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2197,6 +2197,7 @@ static int rcu_nocb_gp_kthread(void *arg)
{
struct rcu_data *rdp = arg;
+ rcu_cpu_kthread_setup(-1);
for (;;) {
WRITE_ONCE(rdp->nocb_gp_loops, rdp->nocb_gp_loops + 1);
nocb_gp_wait(rdp);
@@ -2298,6 +2299,7 @@ static int rcu_nocb_cb_kthread(void *arg)
// Each pass through this loop does one callback batch, and,
// if there are no more ready callbacks, waits for them.
+ rcu_cpu_kthread_setup(-1);
for (;;) {
nocb_cb_wait(rdp);
cond_resched_tasks_rcu_qs();
--
2.9.5
