From: Qais Yousef <qyousef@layalina.io>
To: Andrea Righi <andrea.righi@canonical.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
Joel Fernandes <joel@joelfernandes.org>,
Frederic Weisbecker <frederic@kernel.org>,
Neeraj Upadhyay <quic_neeraju@quicinc.com>,
Josh Triplett <josh@joshtriplett.org>,
Boqun Feng <boqun.feng@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Zqiang <qiang.zhang1211@gmail.com>,
John Stultz <jstultz@google.com>,
linux-kernel@vger.kernel.org, rcu@vger.kernel.org
Subject: Re: [PATCH] rcu: Provide a boot time parameter to enable lazy RCU
Date: Tue, 21 Nov 2023 22:17:52 +0000 [thread overview]
Message-ID: <20231121221752.wphdk3xqgoii6eub@airbuntu> (raw)
In-Reply-To: <ZV7xIjSq1l1q7gRI@gpd>
On 11/23/23 07:28, Andrea Righi wrote:
> On Tue, Nov 21, 2023 at 08:53:04PM +0000, Qais Yousef wrote:
> > To allow more flexible opt-in arrangements while still provide a single
> > kernel for distros, provide a boot time parameter to enable lazy RCU.
> >
> > Specify:
> >
> > rcutree.enable_rcu_lazy
> >
> > Which also requires
> >
> > rcu_nocbs=all
> >
> > at boot time to enable lazy RCU assuming CONFIG_RCU_LAZY=y. The
> > parameter will be ignored if CONFIG_RCU_LAZY is not set.
> >
> > With this change now lazy RCU is disabled by default if the boot
> > parameter is not set even when CONFIG_RCU_LAZY is enabled.
>
> I'm wondering if we should make this enabled by default if
> CONFIG_RCU_LAZY=y, so we don't break the previous behavior, and those
> who want it disabled (despite having CONFIG_RCU_LAZY=y in their .config)
> can add rcutree.enable_rcu_lazy=0 to the boot options.
>
> Thanks for working on this!
Sure, thanks for having a look!
Cheers
--
Qais Yousef
prev parent reply other threads:[~2023-11-23 13:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-21 20:53 Qais Yousef
2023-11-22 22:00 ` Paul E. McKenney
2023-11-21 21:44 ` Qais Yousef
2023-11-22 23:26 ` Paul E. McKenney
2023-11-21 22:15 ` Qais Yousef
2023-11-23 17:42 ` Paul E. McKenney
2023-11-23 18:04 ` Frederic Weisbecker
2023-11-23 18:28 ` Paul E. McKenney
2023-11-23 6:28 ` Andrea Righi
2023-11-21 22:17 ` Qais Yousef [this message]
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