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Message-ID: <Y3wn9AK1XxEZIIFw@slm.duckdns.org>
Date: Mon, 21 Nov 2022 15:37:56 -1000
From: Tejun Heo <tj@...nel.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel-team@...a.com, rostedt@...dmis.org,
Uladzislau Rezki <urezki@...il.com>,
Joel Fernandes <joel@...lfernandes.org>,
Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH v2 rcu 13/16] workqueue: Make queue_rcu_work() use
call_rcu_flush()
On Mon, Nov 21, 2022 at 05:23:57PM -0800, Paul E. McKenney wrote:
> On Mon, Nov 21, 2022 at 03:09:29PM -1000, Tejun Heo wrote:
> > On Mon, Nov 21, 2022 at 05:04:18PM -0800, Paul E. McKenney wrote:
> > > And another call_rcu() instance that cannot be lazy is the one
> > > in queue_rcu_work(), given that callers to queue_rcu_work() are
> > > not necessarily OK with long delays.
> >
> > So, this is fine but another thing we can do is propagating the distinction
> > through the workqueue interface so that the the choice can be made by
> > workqueue users. Would that make sense?
>
> It might well! My thought was to wait to suggest that until we found a
> real-life case where this was needed, but I have no objection to being
> proactive here.
Oh yeah, I'm completely fine either way too.
> But the hard part... Thought for a good name? ;-)
If we go with a separate interface, yeah, _flush would be confusing for
workqueue. Maybe _quick or _hurry? Hmm... it'd be nice to keep the suffix
consistent with RCU. What's the relationship with
synchronize_rcu_expedited()? Would using _expedited be confusing?
Thanks.
--
tejun
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