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From: Joel Fernandes <joel@joelfernandes.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Neeraj Upadhyay <neeraju@codeaurora.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	rcu <rcu@vger.kernel.org>, Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH 2/2] rcu/tree: Clarify comments about FQS loop reporting quiescent states
Date: Wed, 29 Jul 2020 23:25:19 -0400
Message-ID: <CAEXW_YSbad9Cium_9f1eA1RfZ2Me9JcX2S-KMe-jRQo8W6AaBg@mail.gmail.com> (raw)
In-Reply-To: <20200730030221.705255-2-joel@joelfernandes.org>

On Wed, Jul 29, 2020 at 11:02 PM Joel Fernandes (Google)
<joel@joelfernandes.org> wrote:
>
> At least since v4.19, the FQS loop no longer reports quiescent states

I meant here, "FQS loop no longer reports quiescent states for offline CPUs."

Sorry,

 - Joel


> unless it is a dire situation where an offlined CPU failed to report
> a quiescent state. Let us clarify the comment in rcu_gp_init() inorder
> to keep the comment current.
>
> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> ---
>  kernel/rcu/tree.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index 1e51962b565b..929568ff5989 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -1701,8 +1701,8 @@ static bool rcu_gp_init(void)
>
>         /*
>          * Apply per-leaf buffered online and offline operations to the
> -        * rcu_node tree.  Note that this new grace period need not wait
> -        * for subsequent online CPUs, and that quiescent-state forcing
> +        * rcu_node tree.  Note that this new grace period need not wait for
> +        * subsequent online CPUs, and that RCU hooks in CPU offlining path
>          * will handle subsequent offline CPUs.
>          */
>         rcu_state.gp_state = RCU_GP_ONOFF;
> --
> 2.28.0.rc0.142.g3c755180ce-goog
>

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30  3:02 [PATCH 1/2] rcu/tree: Add a warning if CPU being onlined did not report QS already Joel Fernandes (Google)
2020-07-30  3:02 ` [PATCH 2/2] rcu/tree: Clarify comments about FQS loop reporting quiescent states Joel Fernandes (Google)
2020-07-30  3:25   ` Joel Fernandes [this message]
2020-07-30 16:35     ` Paul E. McKenney
2020-07-31  1:21       ` Joel Fernandes
2020-07-31  1:34         ` Paul E. McKenney
2020-07-30 16:21 ` [PATCH 1/2] rcu/tree: Add a warning if CPU being onlined did not report QS already Paul E. McKenney
2020-07-31  1:08   ` Joel Fernandes
2020-07-31  1:42   ` Joel Fernandes
2020-07-31  3:48     ` Paul E. McKenney
2020-08-07 15:37       ` Joel Fernandes
2020-08-07 15:45         ` Joel Fernandes

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