From: Joel Fernandes <joel@joelfernandes.org>
To: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: paulmck@kernel.org, josh@joshtriplett.org, rostedt@goodmis.org,
mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com,
rcu@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] rcu/tree: Force quiescent state on callback overload
Date: Tue, 23 Jun 2020 11:42:14 -0400 [thread overview]
Message-ID: <20200623154214.GE9005@google.com> (raw)
In-Reply-To: <1592764647-2452-1-git-send-email-neeraju@codeaurora.org>
On Mon, Jun 22, 2020 at 12:07:27AM +0530, Neeraj Upadhyay wrote:
> On callback overload, we want to force quiescent state immediately,
> for the first and second fqs. Enforce the same, by including
> RCU_GP_FLAG_OVLD flag, in fqsstart check.
>
> Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
> ---
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
And I think needs fixes tag:
Fixes: 1fca4d12f4637 ("rcu: Expedite first two FQS scans under callback-overload conditions")
thanks,
- Joel
> kernel/rcu/tree.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index d0988a1..6226bfb 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -1865,7 +1865,7 @@ static void rcu_gp_fqs_loop(void)
> break;
> /* If time for quiescent-state forcing, do it. */
> if (!time_after(rcu_state.jiffies_force_qs, jiffies) ||
> - (gf & RCU_GP_FLAG_FQS)) {
> + (gf & (RCU_GP_FLAG_FQS | RCU_GP_FLAG_OVLD))) {
> trace_rcu_grace_period(rcu_state.name, rcu_state.gp_seq,
> TPS("fqsstart"));
> rcu_gp_fqs(first_gp_fqs);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
next prev parent reply other threads:[~2020-06-23 15:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-21 18:37 [PATCH] rcu/tree: Force quiescent state on callback overload Neeraj Upadhyay
2020-06-21 19:50 ` Paul E. McKenney
2020-06-21 20:00 ` Neeraj Upadhyay
2020-06-22 3:13 ` Paul E. McKenney
2020-06-22 3:46 ` Neeraj Upadhyay
2020-06-22 22:53 ` Paul E. McKenney
2020-06-23 6:19 ` Neeraj Upadhyay
2020-06-23 15:42 ` Joel Fernandes [this message]
2020-06-23 16:29 ` Paul E. McKenney
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