rcu: Fix RCU priority boosting and add more debug output
This needs to be split into two commits:
1. Adding and incrementing ->n_boosts and the
tree_stall.h code outputing it and the rest
of the state.
2. Changes to rcu_spawn_one_boost_kthread() and
the addition of rcu_spawn_one_boost_kthread()
to rcutree_online_cpu().
Another commit is needed (or combined with #2 above) that checks for
online CPUs only in the rcu_spawn_boost_kthreads() code path.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
4 files changed