linux-kernel - [PATCH rcu 0/7] Expedited-grace-period updates for v5.17

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Message-ID: <20211202001016.GA3126278@paulmck-ThinkPad-P17-Gen-1>
Date:   Wed, 1 Dec 2021 16:10:16 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org
Subject: [PATCH rcu 0/7] Expedited-grace-period updates for v5.17

Hello!

This series provides updates for RCU expedited grace periods, most
notably 7/7 fixing a low-probability grace-period hang.

1.	Ignore rdp.cpu_no_qs.b.exp on preemptible RCU's rcu_qs(),
	courtesy of Frederic Weisbecker.

2.	Move rcu_data.cpu_no_qs.b.exp reset to rcu_export_exp_rdp(),
	courtesy of Frederic Weisbecker.

3.	Remove rcu_data.exp_deferred_qs and convert to rcu_data.cpu
	no_qs.b.exp, courtesy of Frederic Weisbecker.

4.	Mark sync_sched_exp_online_cleanup() ->cpu_no_qs.b.exp load.

5.	Prevent expedited GP from enabling tick on offline CPU.

6.	Make idle entry report expedited quiescent states.

7.	Mark current CPU as exp-QS in IPI loop second pass, courtesy of
	Frederic Weisbecker.

						Thanx, Paul

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

 b/kernel/rcu/tree.c        |    2 +-
 b/kernel/rcu/tree.h        |    1 -
 b/kernel/rcu/tree_exp.h    |    1 +
 b/kernel/rcu/tree_plugin.h |    6 +++++-
 kernel/rcu/tree_exp.h      |   13 ++++++++-----
 kernel/rcu/tree_plugin.h   |   31 ++++++++++++++++++++-----------
 6 files changed, 35 insertions(+), 19 deletions(-)