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 13/27] context_tracking, rcu: Rename rcu_dynticks_task*() into rcu_task*()
Date: Mon, 13 May 2024 20:39:31 +0200 [thread overview]
Message-ID: <xhsmhv83hh7z0.mognet@vschneid-thinkpadt14sgen2i.remote.csb> (raw)
In-Reply-To: <ZjuOp78k9E0el_Rn@localhost.localdomain>
On 08/05/24 16:39, Frederic Weisbecker wrote:
> Le Tue, Apr 30, 2024 at 11:17:17AM +0200, Valentin Schneider a écrit :
>> The context_tracking.state RCU_DYNTICKS subvariable has been renamed to
>> RCU_WATCHING, and the 'dynticks' prefix can be dropped without losing any
>> meaning.
>>
>> Suggested-by: Frederic Weisbecker <frederic@kernel.org>
>> Signed-off-by: Valentin Schneider <vschneid@redhat.com>
>> ---
>> kernel/context_tracking.c | 20 ++++++++++----------
>> 1 file changed, 10 insertions(+), 10 deletions(-)
>>
>> diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
>> index 647939b0befd9..9c8f7b9191cd4 100644
>> --- a/kernel/context_tracking.c
>> +++ b/kernel/context_tracking.c
>> @@ -39,7 +39,7 @@ EXPORT_SYMBOL_GPL(context_tracking);
>> #define TPS(x) tracepoint_string(x)
>>
>> /* Record the current task on dyntick-idle entry. */
>> -static __always_inline void rcu_dynticks_task_enter(void)
>> +static __always_inline void rcu_task_enter(void)
>
> On a second thought, this should be the reverse. We are not
> telling anymore that we are entering dynticks mode from an
> RCU-task perspective. We are telling that we are exiting RCU-tasks
> because we are in eqs mode (even though this is mostly a concern
> for nohz_full here, as idle tasks are entirely quiescent states
> but anyway...).
>
> So this should be s/rcu_dynticks_task_enter/rcu_task_exit
>
That definitely makes more sense, thanks!
>> {
>> #if defined(CONFIG_TASKS_RCU) && defined(CONFIG_NO_HZ_FULL)
>> WRITE_ONCE(current->rcu_tasks_idle_cpu, smp_processor_id());
>> @@ -47,7 +47,7 @@ static __always_inline void rcu_dynticks_task_enter(void)
>> }
>>
>> /* Record no current task on dyntick-idle exit. */
>> -static __always_inline void rcu_dynticks_task_exit(void)
>> +static __always_inline void rcu_task_exit(void)
>
> And s/rcu_dynticks_task_exit/rcu_task_enter
>
>> {
>> #if defined(CONFIG_TASKS_RCU) && defined(CONFIG_NO_HZ_FULL)
>> WRITE_ONCE(current->rcu_tasks_idle_cpu, -1);
>> @@ -55,7 +55,7 @@ static __always_inline void rcu_dynticks_task_exit(void)
>> }
>>
>> /* Turn on heavyweight RCU tasks trace readers on idle/user entry. */
>> -static __always_inline void rcu_dynticks_task_trace_enter(void)
>> +static __always_inline void rcu_task_trace_enter(void)
>
> The same reverse naming goes for task_trace (even though I can't make
> sense right now of what the barrier it implies orders exactly, but that's
> another story)
Ack.
>
>> {
>> #ifdef CONFIG_TASKS_TRACE_RCU
>> if (IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB))
>> @@ -64,7 +64,7 @@ static __always_inline void rcu_dynticks_task_trace_enter(void)
>> }
>>
>> /* Turn off heavyweight RCU tasks trace readers on idle/user exit. */
>> -static __always_inline void rcu_dynticks_task_trace_exit(void)
>> +static __always_inline void rcu_task_trace_exit(void)
>> {
>> #ifdef CONFIG_TASKS_TRACE_RCU
>> if (IS_ENABLED(CONFIG_TASKS_TRACE_RCU_READ_MB))
>> @@ -87,7 +87,7 @@ static noinstr void ct_kernel_exit_state(int offset)
>> * critical sections, and we also must force ordering with the
>> * next idle sojourn.
>> */
>> - rcu_dynticks_task_trace_enter(); // Before ->dynticks update!
>> + rcu_task_trace_enter(); // Before ->dynticks update!
>
> s/->dynticks/->state
>
>> seq = ct_state_inc(offset);
>> // RCU is no longer watching. Better be in extended quiescent state!
>> WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && (seq & CT_RCU_WATCHING));
>> @@ -109,7 +109,7 @@ static noinstr void ct_kernel_enter_state(int offset)
>> */
>> seq = ct_state_inc(offset);
>> // RCU is now watching. Better not be in an extended quiescent state!
>> - rcu_dynticks_task_trace_exit(); // After ->dynticks update!
>> + rcu_task_trace_exit(); // After ->dynticks update!
>
> ditto
I've got these fixed in 25/27, but I can fold it down into the patches that
touch the related areas.
>
> Thanks!
next prev parent reply other threads:[~2024-05-13 18:39 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 [this message]
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
2024-05-14 12:09 ` Frederic Weisbecker
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