[PATCH v2 0/3] reduce latency of normal synchronize_rcu() v2

[Uladzislau Rezki (Sony)]

v1 is here https://lore.kernel.org/lkml/20231025140915.590390-1-urezki@xxxxxxxxx/T/

The delta v1 -> v2:
- rework a commit message;
- use non-ordered __llist* API for a wait list manipulation.

The aim of this series is to reduce a latency, make synchronize_rcu()
more generic, unify it. Because currently a behavior depends much on
RCU kconfig combinations, like, CONFIG_RCU_NOCB_CPU, CONFIG_RCU_LAZY.
For example we have a soft-irq/ksoftirqd context or a regular kthread. 

Uladzislau Rezki (Sony) (3):
  rcu: Reduce synchronize_rcu() latency
  rcu: Add a trace event for synchronize_rcu_normal()
  doc: Add rcutree.rcu_normal_wake_from_gp to kernel-parameters.txt

 .../admin-guide/kernel-parameters.txt         |  14 ++
 include/trace/events/rcu.h                    |  27 +++
 kernel/rcu/tree.c                             | 156 +++++++++++++++++-
 kernel/rcu/tree_exp.h                         |   2 +-
 4 files changed, 197 insertions(+), 2 deletions(-)

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2.30.2