linux-kernel - Re: [PATCH v2 4/6] rcu-tasks: Maintain lists to eliminate RCU-tasks/do

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Date: Thu, 22 Feb 2024 17:32:20 +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>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Chen Zhongjin <chenzhongjin@...wei.com>,
	Yang Jihong <yangjihong1@...wei.com>,
	Neeraj Upadhyay <quic_neeraju@...cinc.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>
Subject: Re: [PATCH v2 4/6] rcu-tasks: Maintain lists to eliminate
 RCU-tasks/do_exit() deadlocks

Le Fri, Feb 16, 2024 at 05:27:39PM -0800, Boqun Feng a écrit :
> From: "Paul E. McKenney" <paulmck@...nel.org>
> 
> This commit continues the elimination of deadlocks involving do_exit()
> and RCU tasks by causing exit_tasks_rcu_start() to add the current
> task to a per-CPU list and causing exit_tasks_rcu_stop() to remove the
> current task from whatever list it is on.  These lists will be used to
> track tasks that are exiting, while still accounting for any RCU-tasks
> quiescent states that these tasks pass though.
> 
> [ paulmck: Apply Frederic Weisbecker feedback. ]
> 
> Link: https://lore.kernel.org/all/20240118021842.290665-1-chenzhongjin@huawei.com/
> 
> Reported-by: Chen Zhongjin <chenzhongjin@...wei.com>
> Reported-by: Yang Jihong <yangjihong1@...wei.com>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> Tested-by: Yang Jihong <yangjihong1@...wei.com>
> Tested-by: Chen Zhongjin <chenzhongjin@...wei.com>
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>

Reviewed-by: Frederic Weisbecker <frederic@...nel.org>