From: Valentin Schneider <vschneid@redhat.com>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: rcu@vger.kernel.org, linux-kernel@vger.kernel.org,
"Paul E. McKenney" <paulmck@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Neeraj Upadhyay <quic_neeraju@quicinc.com>,
Joel Fernandes <joel@joelfernandes.org>,
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>
Subject: Re: [PATCH v2 27/27] context_tracking, rcu: Rename rcu_dyntick trace event into rcu_watching
Date: Mon, 13 May 2024 20:40:42 +0200 [thread overview]
Message-ID: <xhsmhr0e5h7x1.mognet@vschneid-thinkpadt14sgen2i.remote.csb> (raw)
In-Reply-To: <ZjuFUZXk4rYO4L2v@localhost.localdomain>
On 08/05/24 15:59, Frederic Weisbecker wrote:
> Le Tue, Apr 30, 2024 at 11:17:31AM +0200, Valentin Schneider a écrit :
>> @@ -228,7 +228,7 @@ void noinstr ct_nmi_exit(void)
>> }
>>
>> /* This NMI interrupted an RCU-idle CPU, restore RCU-idleness. */
>> - trace_rcu_dyntick(TPS("Startirq"), ct_nmi_nesting(), 0, ct_rcu_watching());
>> + trace_rcu_watching(TPS("Endirq"), ct_nmi_nesting(), 0, ct_rcu_watching());
>
> Ah the initial string was wrong and you're fixing it, right?
>
> Should be a seperate patch?
>
No, I'm just creating confusion for everyone involved (including myself) :(
Dynticks start when RCU stops watching, so the naming logic gets flipped on
its head.
If I take the original comment from
bd2b879a1ca5 ("rcu: Add tracing to irq/NMI dyntick-idle transitions")
"""
as argument: "Start" for entering dyntick-idle mode, "Startirq" for
entering it from irq/NMI
"""
So here "Startirq" means "start dyntick mode from IRQ". With the name
change, it should be "Endirq", since RCU stops watching, from IRQ...
I know, a lot of confusion for 0 functional change :(
next prev parent reply other threads:[~2024-05-13 18:40 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-30 9:17 [PATCH v2 00/27] context_tracking, rcu: Spring cleaning renaming Valentin Schneider
2024-04-30 9:17 ` [PATCH v2 01/27] treewide: context_tracking: Rename CONTEXT_* into CT_STATE_* Valentin Schneider
2024-04-30 9:17 ` [PATCH v2 02/27] context_tracking, rcu: Rename RCU_DYNTICKS_IDX into CT_RCU_WATCHING Valentin Schneider
2024-05-06 10:39 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 03/27] context_tracking, rcu: Rename ct_dynticks() into ct_rcu_watching() Valentin Schneider
2024-05-06 10:41 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 04/27] context_tracking, rcu: Rename ct_dynticks_cpu() into ct_rcu_watching_cpu() Valentin Schneider
2024-05-06 10:43 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 05/27] context_tracking, rcu: Rename ct_dynticks_cpu_acquire() into ct_rcu_watching_cpu_acquire() Valentin Schneider
2024-05-06 10:45 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 06/27] context_tracking, rcu: Rename struct context_tracking .dynticks_nesting into .nesting Valentin Schneider
2024-05-06 10:48 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 07/27] context_tracking, rcu: Rename ct_dynticks_nesting() into ct_nesting() Valentin Schneider
2024-05-06 11:01 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 08/27] context_tracking, rcu: Rename ct_dynticks_nesting_cpu() into ct_nesting_cpu() Valentin Schneider
2024-05-06 20:09 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 09/27] context_tracking, rcu: Rename struct context_tracking .dynticks_nmi_nesting into .nmi_nesting Valentin Schneider
2024-05-06 20:19 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 10/27] context_tracking, rcu: Rename ct_dynticks_nmi_nesting() into ct_nmi_nesting() Valentin Schneider
2024-05-06 20:50 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 11/27] context_tracking, rcu: Rename ct_dynticks_nmi_nesting_cpu() into ct_nmi_nesting_cpu() Valentin Schneider
2024-05-06 21:03 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 12/27] context_tracking, rcu: Rename DYNTICK_IRQ_NONIDLE into CT_NESTING_IRQ_NONIDLE Valentin Schneider
2024-05-06 21:06 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 13/27] context_tracking, rcu: Rename rcu_dynticks_task*() into rcu_task*() Valentin Schneider
2024-05-06 21:15 ` Frederic Weisbecker
2024-05-08 14:39 ` Frederic Weisbecker
2024-05-13 18:39 ` Valentin Schneider
2024-04-30 9:17 ` [PATCH v2 14/27] context_tracking, rcu: Rename rcu_dynticks_curr_cpu_in_eqs() into rcu_watching_curr_cpu() Valentin Schneider
2024-05-06 22:00 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 15/27] rcu: Rename rcu_dynticks_eqs_online() into rcu_watching_eqs_online() Valentin Schneider
2024-05-06 22:18 ` Frederic Weisbecker
2024-05-07 8:59 ` Valentin Schneider
2024-04-30 9:17 ` [PATCH v2 16/27] rcu: Rename rcu_dynticks_snap() into rcu_watching_snap() Valentin Schneider
2024-05-07 13:11 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 17/27] rcu: Rename rcu_dynticks_in_eqs() into rcu_watching_in_eqs() Valentin Schneider
2024-05-07 13:32 ` Frederic Weisbecker
2024-05-07 15:48 ` Valentin Schneider
2024-05-08 10:46 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 18/27] rcu: Rename rcu_dynticks_in_eqs_since() into rcu_watching_changed_since() Valentin Schneider
2024-05-07 13:48 ` Frederic Weisbecker
2024-05-07 17:14 ` Paul E. McKenney
2024-05-08 10:59 ` Frederic Weisbecker
2024-05-13 18:40 ` Valentin Schneider
2024-05-14 10:42 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 19/27] rcu: Rename rcu_dynticks_zero_in_eqs() into rcu_watching_zero_in_eqs() Valentin Schneider
2024-05-08 12:43 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 20/27] rcu: Rename struct rcu_data .dynticks_snap into .watching_snap Valentin Schneider
2024-05-08 12:55 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 21/27] rcu: Rename struct rcu_data .exp_dynticks_snap into .exp_watching_snap Valentin Schneider
2024-05-08 13:06 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 22/27] rcu: Rename dyntick_save_progress_counter() into eqs_save_progress_counter() Valentin Schneider
2024-05-08 13:21 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 23/27] rcu: Rename rcu_implicit_dynticks_qs() into rcu_implicit_eqs() Valentin Schneider
2024-04-30 9:17 ` [PATCH v2 24/27] rcu: Rename rcu_momentary_dyntick_idle() into rcu_momentary_eqs() Valentin Schneider
2024-05-08 13:30 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 25/27] context_tracking, rcu: Rename stray ->dynticks comments Valentin Schneider
2024-05-08 13:39 ` Frederic Weisbecker
2024-04-30 9:17 ` [PATCH v2 26/27] rcu: Update stray documentation references to rcu_dynticks_eqs_{enter, exit}() Valentin Schneider
2024-05-08 14:55 ` Frederic Weisbecker
2024-05-13 18:40 ` Valentin Schneider
2024-04-30 9:17 ` [PATCH v2 27/27] context_tracking, rcu: Rename rcu_dyntick trace event into rcu_watching Valentin Schneider
2024-05-08 13:59 ` Frederic Weisbecker
2024-05-13 18:40 ` Valentin Schneider [this message]
2024-05-14 12:09 ` Frederic Weisbecker
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