netdev - Re: [PATCH] net: raise RCU qs after each threaded NAPI poll

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Message-ID: <20240307135215.7ba88d83@gandalf.local.home>
Date: Thu, 7 Mar 2024 13:52:15 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Mark Rutland <mark.rutland@....com>
Cc: Joel Fernandes <joel@...lfernandes.org>, paulmck@...nel.org, Network
 Development <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
 rcu@...r.kernel.org, kernel-team <kernel-team@...udflare.com>
Subject: Re: [PATCH] net: raise RCU qs after each threaded NAPI poll

On Thu, 7 Mar 2024 16:57:33 +0000
Mark Rutland <mark.rutland@....com> wrote:

> * Use rcu_tasks_trace to synchronize updates?

Yes. I think I wanted both. The above to make sure it covers all cases
where something could be preempted, and a case for those covered when RCU
isn't watching (which always has preemption disabled).

My mistake was I thought synchronize_rcu_tasks_rude() did both. But I just
found out recently that it is not a superset of synchronize_rcu_tasks().

But it really needs it in every location that synchronize_rcu_tasks_rude()
is called.

-- Steve