linux-kernel - Re: [PATCH v2] EXP rcu: Move expedited grace period (GP) work to RT kthread

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Date:   Fri, 8 Apr 2022 15:06:56 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     paulmck@...nel.org, Joel Fernandes <joel@...lfernandes.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        kernel-team <kernel-team@...roid.com>, Tejun Heo <tj@...nel.org>,
        Tim Murray <timmurray@...gle.com>, Wei Wang <wvw@...gle.com>,
        Kyle Lin <kylelin@...gle.com>,
        Chunwei Lu <chunweilu@...gle.com>,
        Lulu Wang <luluw@...gle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        rcu <rcu@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] EXP rcu: Move expedited grace period (GP) work to RT kthread_worker

On Fri, Apr 8, 2022 at 2:42 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Fri, 8 Apr 2022 10:53:53 -0700
> Kalesh Singh <kaleshsingh@...gle.com> wrote:
>
> > If PREEMT_RT systems don’t disable expedited grace periods, we can
> > remove default off for those. Steve?
>
> Yep, commit 36221e109eb20 ("rcu: Enable rcu_normal_after_boot
> unconditionally for RT") is still there.
>
> OK, that explains it. I missed that change, so I didn't see the relation to
> PREEMPT_RT. It wasn't described in the change log nor was there any
> comment in the kconfig to say why it was special. Perhaps that should be
> added for those that don't know all this tribal knowledge ;-)

Thanks for verifying Steve. I'll update the commit and Kconfig texts
accordingly.

-Kalesh

>
> -- Steve
>
> --
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