[PATCH tip/core/rcu 0/4] kfree_rcu() updates for v5.8

[Paul E. McKenney]

Hello!

This series updates kfree_rcu() testing and OOM handling.  It also
provides a rcu_gp_might_be_stalled() function that judges whether or
not RCU is being stalled.

1.	Add ability to increase object allocation size, courtesy
	of Joel Fernandes.

2.	rcu/tree: Add a shrinker to prevent OOM due to kfree_rcu()
	batching, courtesy of Joel Fernandes.

3.	rcu/tree: Count number of batched kfree_rcu() locklessly,
	courtesy of Joel Fernandes.

4.	Add rcu_gp_might_be_stalled() to indicate whether or not there
	is currently a good chance that the current RCU grace period
	is being stalled.

							Thanx, Paul

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

 include/linux/rcutiny.h |    1 
 include/linux/rcutree.h |    1 
 kernel/rcu/rcuperf.c    |    5 ++-
 kernel/rcu/tree.c       |   70 +++++++++++++++++++++++++++++++++++++++++++-----
 kernel/rcu/tree_stall.h |   40 ++++++++++++++++++++++++---
 5 files changed, 106 insertions(+), 11 deletions(-)