linux-kernel - Re: [RFC PATCH 13/17] rv: Convert the opid monitor to a hybrid automaton

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Message-ID: <20250902092848.tscxe_nR@linutronix.de>
Date: Tue, 2 Sep 2025 11:28:48 +0200
From: Nam Cao <namcao@...utronix.de>
To: Gabriele Monaco <gmonaco@...hat.com>
Cc: linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Jonathan Corbet <corbet@....net>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Tomas Glozar <tglozar@...hat.com>, Juri Lelli <jlelli@...hat.com>,
	Clark Williams <williams@...hat.com>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [RFC PATCH 13/17] rv: Convert the opid monitor to a hybrid
 automaton

On Thu, Aug 14, 2025 at 05:08:05PM +0200, Gabriele Monaco wrote:
> +doesn't match a task wakeup and might occur with only interrupts disabled.
> +The interrupt and preemption status are validated by the hybrid automaton
> +constraints when processing the events::
> +
> +   |
> +   |
> +   v
> + #=========#   sched_need_resched;irq_off == 1
> + H         H   sched_waking;irq_off == 1 && preempt_off == 1
> + H   any   H ------------------------------------------------+
> + H         H                                                 |
> + H         H <-----------------------------------------------+
> + #=========#

Yeah, I like this much better. The previous monitor looks like it is easily
broken by any kernel refactoring.

Nam