linux-kernel - [PATCH rcu 0/18] RCU Tasks updates for v5.17

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Date:   Wed, 1 Dec 2021 16:38:26 -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 0/18] RCU Tasks updates for v5.17

Hello!

This series provides RCU Tasks updates, including making stall warnings
use task_call_func() and providing better update-side scalability for
call_rcu_tasks_trace() and friends:

1.	rcu-tasks: Don't remove tasks with pending IPIs from holdout list.

2.	rcu-tasks:  Create per-CPU callback lists.

3.	rcu-tasks: Introduce ->percpu_enqueue_shift for dynamic queue
	selection.

4.	rcu-tasks: Convert grace-period counter to grace-period sequence
	number.

5.	rcu_tasks: Convert bespoke callback list to rcu_segcblist
	structure.

6.	rcu-tasks: Use spin_lock_rcu_node() and friends.

7.	rcu-tasks: Inspect stalled task's trc state in locked state,
	courtesy of Neeraj Upadhyay.

8.	rcu-tasks: Add a ->percpu_enqueue_lim to the rcu_tasks structure.

9.	rcu-tasks: Abstract checking of callback lists.

10.	rcu-tasks: Abstract invocations of callbacks.

11.	rcu-tasks: Use workqueues for multiple rcu_tasks_invoke_cbs()
	invocations.

12.	rcu-tasks: Make rcu_barrier_tasks*() handle multiple callback
	queues.

13.	rcu-tasks: Add rcupdate.rcu_task_enqueue_lim to set initial
	queueing.

14.	rcu-tasks: Count trylocks to estimate call_rcu_tasks() contention.

15.	rcu-tasks: Avoid raw-spinlocked wakeups from
	call_rcu_tasks_generic().

16.	rcu-tasks: Use more callback queues if contention encountered.

17.	rcu-tasks: Use separate ->percpu_dequeue_lim for callback
	dequeueing.

18.	rcu-tasks: Use fewer callbacks queues if callback flood ends.

						Thanx, Paul

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

 Documentation/admin-guide/kernel-parameters.txt   |   16 
 b/Documentation/admin-guide/kernel-parameters.txt |    7 
 b/kernel/rcu/Kconfig                              |    2 
 b/kernel/rcu/tasks.h                              |    5 
 kernel/rcu/tasks.h                                |  668 ++++++++++++++++------
 5 files changed, 518 insertions(+), 180 deletions(-)