From: Steven Rostedt <rostedt@goodmis.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Byungchul Park <byungchul.park@lge.com>,
jiangshanlai@gmail.com, josh@joshtriplett.org,
mathieu.desnoyers@efficios.com, linux-kernel@vger.kernel.org,
kernel-team@lge.com, joel@joelfernandes.org
Subject: Re: [RFC 1/2] rcu: Do prepare and cleanup idle depending on in_nmi()
Date: Wed, 20 Jun 2018 12:11:56 -0400 [thread overview]
Message-ID: <20180620121156.4da98db2@gandalf.local.home> (raw)
In-Reply-To: <20180620155658.GU3593@linux.vnet.ibm.com>
On Wed, 20 Jun 2018 08:56:58 -0700
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> OK, so in theory this change is safe from a tracing perspective. But
> it does add conditionals to a fastpath.
Does it?
I see it replacing two conditions from both rcu_irq_enter/exit() with a
single one in rcu_nmi_enter/exit(). Sure it adds one to rcu_nmi_enter()
but that's a far less fast path than rcu_irq_enter(), which this patch
removes a conditional from.
-- Steve
next prev parent reply other threads:[~2018-06-20 16:12 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-20 8:47 [RFC 1/2] rcu: Do prepare and cleanup idle depending on in_nmi() Byungchul Park
2018-06-20 8:47 ` [RFC 2/2] rcu: Remove ->dynticks_nmi_nesting from struct rcu_dynticks Byungchul Park
2018-06-20 14:58 ` Paul E. McKenney
2018-06-20 16:05 ` Byungchul Park
2018-06-20 16:49 ` Paul E. McKenney
2018-06-20 17:15 ` Byungchul Park
2018-06-20 17:40 ` Paul E. McKenney
2018-06-21 6:39 ` Byungchul Park
2018-06-21 6:48 ` Byungchul Park
2018-06-21 10:08 ` Byungchul Park
2018-06-21 15:05 ` Paul E. McKenney
2018-06-21 15:04 ` Paul E. McKenney
2018-06-22 3:00 ` Byungchul Park
2018-06-22 13:36 ` Paul E. McKenney
2018-06-22 5:56 ` Joel Fernandes
2018-06-22 13:28 ` Paul E. McKenney
2018-06-22 14:19 ` Andy Lutomirski
2018-06-22 16:12 ` Paul E. McKenney
2018-06-22 16:01 ` Steven Rostedt
2018-06-22 18:14 ` Paul E. McKenney
2018-06-22 18:19 ` Joel Fernandes
2018-06-22 18:32 ` Steven Rostedt
2018-06-22 20:05 ` Joel Fernandes
2018-06-25 8:28 ` Byungchul Park
2018-06-25 16:39 ` Joel Fernandes
2018-06-25 17:19 ` Paul E. McKenney
2018-06-25 19:15 ` Joel Fernandes
2018-06-25 20:25 ` Steven Rostedt
2018-06-25 20:47 ` Paul E. McKenney
2018-06-25 20:47 ` Andy Lutomirski
2018-06-25 22:16 ` Steven Rostedt
2018-06-25 23:30 ` Andy Lutomirski
2018-06-25 22:15 ` Steven Rostedt
2018-06-25 23:32 ` Andy Lutomirski
2018-06-25 21:25 ` Joel Fernandes
2018-06-22 20:58 ` Paul E. McKenney
2018-06-22 20:58 ` Paul E. McKenney
2018-06-22 21:00 ` Steven Rostedt
2018-06-22 21:16 ` Paul E. McKenney
2018-06-22 22:03 ` Andy Lutomirski
2018-06-23 17:53 ` Paul E. McKenney
2018-06-28 20:02 ` Paul E. McKenney
2018-06-28 21:13 ` Joel Fernandes
2018-06-28 21:41 ` Paul E. McKenney
2018-06-23 15:48 ` Joel Fernandes
2018-06-23 17:56 ` Paul E. McKenney
2018-06-24 3:02 ` Joel Fernandes
2018-06-20 13:33 ` [RFC 1/2] rcu: Do prepare and cleanup idle depending on in_nmi() Steven Rostedt
2018-06-20 14:58 ` Paul E. McKenney
2018-06-20 15:25 ` Byungchul Park
2018-06-20 14:50 ` Paul E. McKenney
2018-06-20 15:43 ` Steven Rostedt
2018-06-20 15:56 ` Paul E. McKenney
2018-06-20 16:11 ` Byungchul Park
2018-06-20 16:14 ` Steven Rostedt
2018-06-20 16:37 ` Byungchul Park
2018-06-20 16:11 ` Steven Rostedt [this message]
2018-06-20 16:30 ` Paul E. McKenney
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