linux-kernel - [PATCH 00/10] rcu: Allow a CPU to leave and reenter NOCB state

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Date:   Wed, 13 May 2020 18:47:04 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E . McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Josh Triplett <josh@...htriplett.org>
Subject: [PATCH 00/10] rcu: Allow a CPU to leave and reenter NOCB state

This is a necessary step toward making nohz_full controllable through
cpuset. Next step should be to allow a CPU to be nocb even if it wasn't
part of the nocb set on boot.

The core design of this set is mostly based on suggestions from Paul
of course.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	rcu/nohz

HEAD: 31cb4ee9da4e9cc6314498ff22d83f0d872b1a88

Thanks,
	Frederic
---

Frederic Weisbecker (10):
      rcu: Directly lock rdp->nocb_lock on nocb code entrypoints
      rcu: Use direct rdp->nocb_lock operations on local calls
      rcu: Make locking explicit in do_nocb_deferred_wakeup_common()
      rcu: Implement rcu_segcblist_is_offloaded() config dependent
      rcu: Remove useless conditional nocb unlock
      rcu: Make nocb_cb kthread parkable
      rcu: Temporarily assume that nohz full CPUs might not be NOCB
      rcu: Allow to deactivate nocb on a CPU
      rcu: Allow to re-offload a CPU that used to be nocb
      rcu: Nocb (de)activate through sysfs


 include/linux/rcu_segcblist.h |   2 +
 include/linux/rcupdate.h      |   4 ++
 kernel/cpu.c                  |  23 +++++++
 kernel/rcu/rcu_segcblist.c    |   6 +-
 kernel/rcu/rcu_segcblist.h    |   8 ++-
 kernel/rcu/tree.c             |  24 +++----
 kernel/rcu/tree.h             |   2 +-
 kernel/rcu/tree_plugin.h      | 149 ++++++++++++++++++++++++++++++++++--------
 8 files changed, 172 insertions(+), 46 deletions(-)