linux-kernel - Re: [PATCH] rcu: Provide a boot time parameter to enable lazy RCU

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Message-ID: <29158f4d-f278-4344-9def-a10f728fa67a@paulmck-laptop>
Date:   Thu, 23 Nov 2023 10:28:42 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Qais Yousef <qyousef@...alina.io>,
        Joel Fernandes <joel@...lfernandes.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Zqiang <qiang.zhang1211@...il.com>,
        Andrea Righi <andrea.righi@...onical.com>,
        John Stultz <jstultz@...gle.com>, linux-kernel@...r.kernel.org,
        rcu@...r.kernel.org
Subject: Re: [PATCH] rcu: Provide a boot time parameter to enable lazy RCU

On Thu, Nov 23, 2023 at 07:04:02PM +0100, Frederic Weisbecker wrote:
> Le Thu, Nov 23, 2023 at 09:42:12AM -0800, Paul E. McKenney a écrit :
> > On Tue, Nov 21, 2023 at 10:15:56PM +0000, Qais Yousef wrote:
> > > On 11/22/23 15:26, Paul E. McKenney wrote:
> > > 
> > > > > Either way; I'll follow what the crowd wants too :-)
> > > > 
> > > > Usually a wise choice.  ;-)
> > > > 
> > > > But I must defer to the people using it.
> > > 
> > > >From Android PoV I'd like to be able to boot with default disabled and allow
> > > people to opt-in. At least for the time being until we have confidence no one
> > > is caught with surprise if this caused unexpected problems.
> > > 
> > > In the future it might default to on once it gets wider usage and testing.
> > > 
> > > So having a new Kconfig to DEFAULT_OFF sounds good to me to enable a compile
> > > time switch to pick the default with a boot time to further control.
> > > 
> > > Which would be my plan for v2 unless I hear another suggestion in the coming
> > > week (where I hope people would have had a chance to look and think about it).
> > 
> > Sounds good to me!  Silence will be interpreted as assent.  ;-)
> 
> Silence sounds good to me :-)

This reply intentionally left content-free to preserve the silence.  ;-)

							Thanx, Paul