linux-kernel - [PATCH tip/core/rcu 0/12] Forward-progress changes for v5.1

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Message-Id: <20190109212816.GA32282@linux.ibm.com>
Date:   Wed, 9 Jan 2019 13:28:16 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.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 tip/core/rcu 0/12] Forward-progress changes for v5.1

Hello!

This series contains commits that improve RCU's ability to make forward
progress on grace periods:

1.	Accommodate zero jiffies_till_first_fqs and kthread kicking.

2-6.	Move per-CPU variables to rcu_data structure, now that rcu_data
	is strictly per-CPU itself due to there only being one flavor.
	Also remove rcu_cpu_kthread_loops and rcu_cpu_kthread_cpu,
	which are unused.

7.	Update outdated NOCB comments.

8.	Improve diagnostics for failed RCU grace-period start.

9.	Protect rcu_check_gp_kthread_starvation() access to ->gp_flags.

10.	Add sysrq rcu_node-dump capability to assist with debugging of
	forward-progress issues.

11.	Do RCU GP kthread self-wakeup from softirq and interrupt, thus
	fixing a grace-period hang, courtesy of Jun Zhang.

12.	Prevent needless ->gp_seq_needed update in __note_gp_changes(),
	courtesy of Jun Zhang.

							Thanx, Paul

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

 Documentation/admin-guide/kernel-parameters.txt |    5 +
 kernel/rcu/tree.c                               |  106 ++++++++++++++++--------
 kernel/rcu/tree.h                               |   19 ++--
 kernel/rcu/tree_plugin.h                        |   68 ++++++---------
 4 files changed, 117 insertions(+), 81 deletions(-)