[PATCH tip/core/rcu 0/11] No-CBs grace-period kthread updates for v5.3-rc2

From: Paul E. McKenney
Date: Thu Aug 01 2019 - 18:50:47 EST


Hello!

This series reduces memory footprint (RCU callbacks posted by no-CBs
CPUs) by providing separate rcuog kthreads that wait for grace periods,
thus avoiding the current situation in which callbacks are delayed while
the leader rcuo kthreads invokes callbacks:

1. Rename rcu_data fields to prepare for forward-progress work.

2. Update comments to prepare for forward-progress work.

3. Provide separate no-CBs grace-period kthreads.

4. Rename nocb_follower_wait() to nocb_cb_wait().

5. Rename wake_nocb_leader() to wake_nocb_gp().

6. Rename __wake_nocb_leader() to __wake_nocb_gp().

7. Rename wake_nocb_leader_defer() to wake_nocb_gp_defer().

8. Rename rcu_organize_nocb_kthreads() local variable.

9. Rename and document no-CB CB kthread sleep trace event.

10. Rename rcu_nocb_leader_stride kernel boot parameter.

11. Print gp/cb kthread hierarchy if dump_tree.

Thanx, Paul

------------------------------------------------------------------------

Documentation/admin-guide/kernel-parameters.txt | 13 -
include/trace/events/rcu.h | 3
kernel/rcu/tree.h | 28 +-
kernel/rcu/tree_plugin.h | 312 ++++++++++++------------
4 files changed, 183 insertions(+), 173 deletions(-)