From: Steven Rostedt <rostedt@goodmis.org>
To: Valentin Schneider <valentin.schneider@arm.com>
Cc: linux-kernel@vger.kernel.org,
"Abhijeet Dharmapurikar" <adharmap@quicinc.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Dietmar Eggemann" <dietmar.eggemann@arm.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Vincent Guittot" <vincent.guittot@linaro.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
"Juri Lelli" <juri.lelli@redhat.com>,
"Daniel Bristot de Oliveira" <bristot@redhat.com>,
"Kees Cook" <keescook@chromium.org>,
"Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH 2/2] sched/tracing: Add TASK_RTLOCK_WAIT to TASK_REPORT
Date: Wed, 8 Dec 2021 15:34:00 -0500 [thread overview]
Message-ID: <20211208153400.1c97ad3c@gandalf.local.home> (raw)
In-Reply-To: <20211129123601.2101873-3-valentin.schneider@arm.com>
On Mon, 29 Nov 2021 12:36:01 +0000
Valentin Schneider <valentin.schneider@arm.com> wrote:
> TASK_RTLOCK_WAIT currently isn't part of TASK_REPORT, thus a task blocking
> on an rtlock will appear as having a task state == 0, IOW TASK_RUNNING.
>
> The actual state is saved in p->saved_state, but reading it after reading
> p->__state has a few issues:
> o that could still be TASK_RUNNING in the case of e.g. rt_spin_lock
> o ttwu_state_match() might have changed that to TASK_RUNNING
>
> Add TASK_RTLOCK_WAIT to TASK_REPORT.
>
The patch looks good, but I may play with it more. But in the mean time...
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-- Steve
next prev parent reply other threads:[~2021-12-08 20:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-29 12:35 [RFC PATCH 0/2] sched/tracing: sched_switch prev_state reported as TASK_RUNNING when it's not Valentin Schneider
2021-11-29 12:36 ` [RFC PATCH 1/2] sched/tracing: Don't re-read p->state when emitting sched_switch event Valentin Schneider
2021-12-08 20:12 ` Steven Rostedt
2021-12-09 13:02 ` Valentin Schneider
2021-11-29 12:36 ` [RFC PATCH 2/2] sched/tracing: Add TASK_RTLOCK_WAIT to TASK_REPORT Valentin Schneider
2021-12-08 20:34 ` Steven Rostedt [this message]
2022-01-14 10:11 ` Sebastian Andrzej Siewior
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