linux-kernel - Re: [PATCH v2 0/6] RCU tasks fixes for v6.9

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Message-ID: <Zdd7x4Rmy_-WDqfl@localhost.localdomain>
Date: Thu, 22 Feb 2024 17:52:23 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
	Neeraj Upadhyay <Neeraj.Upadhyay@....com>
Subject: Re: [PATCH v2 0/6] RCU tasks fixes for v6.9

Le Fri, Feb 16, 2024 at 05:27:35PM -0800, Boqun Feng a écrit :
> Hi,
> 
> This series contains the fixes of RCU tasks for v6.9. You can also find
> the series at:
> 
> 	git://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git rcu-tasks.2024.02.14a
> 
> Changes since v1:
> 
> *	Update with Paul's rework on "Eliminate deadlocks involving
> 	do_exit() and RCU task"
> 
> The detailed list of changes:
> 
> Paul E. McKenney (6):
>   rcu-tasks: Repair RCU Tasks Trace quiescence check
>   rcu-tasks: Add data to eliminate RCU-tasks/do_exit() deadlocks
>   rcu-tasks: Initialize data to eliminate RCU-tasks/do_exit() deadlocks
>   rcu-tasks: Maintain lists to eliminate RCU-tasks/do_exit() deadlocks
>   rcu-tasks: Eliminate deadlocks involving do_exit() and RCU tasks

Food for later thoughts and further improvements: would it make sense to
call exit_rcu_tasks_start() on fork() instead and rely solely on
each CPUs' rtp_exit_list instead of the tasklist?

Thanks.

>   rcu-tasks: Maintain real-time response in rcu_tasks_postscan()
> 
>  include/linux/rcupdate.h |   4 +-
>  include/linux/sched.h    |   2 +
>  init/init_task.c         |   1 +
>  kernel/fork.c            |   1 +
>  kernel/rcu/tasks.h       | 110 ++++++++++++++++++++++++++++++---------
>  5 files changed, 90 insertions(+), 28 deletions(-)
> 
> -- 
> 2.43.0
> 
>