Hello!
This series contains commits that improve RCU's ability to make forward
progress on grace periods:
1. Accommodate zero jiffies_till_first_fqs and kthread kicking.
2-6. Move per-CPU variables to rcu_data structure, now that rcu_data
is strictly per-CPU itself due to there only being one flavor.
Also remove rcu_cpu_kthread_loops and rcu_cpu_kthread_cpu,
which are unused.
7. Update outdated NOCB comments.
8. Improve diagnostics for failed RCU grace-period start.
9. Protect rcu_check_gp_kthread_starvation() access to ->gp_flags.
10. Add sysrq rcu_node-dump capability to assist with debugging of
forward-progress issues.
11. Do RCU GP kthread self-wakeup from softirq and interrupt, thus
fixing a grace-period hang, courtesy of Jun Zhang.
12. Prevent needless ->gp_seq_needed update in __note_gp_changes(),
courtesy of Jun Zhang.
Thanx, Paul
------------------------------------------------------------------------
Documentation/admin-guide/kernel-parameters.txt | 5 +
kernel/rcu/tree.c | 106 ++++++++++++++++--------
kernel/rcu/tree.h | 19 ++--
kernel/rcu/tree_plugin.h | 68 ++++++---------
4 files changed, 117 insertions(+), 81 deletions(-)
