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From: Nam Cao <namcao@linutronix.de>
To: Gabriele Monaco <gmonaco@redhat.com>
Cc: linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	Tomas Glozar <tglozar@redhat.com>, Juri Lelli <jlelli@redhat.com>,
	Clark Williams <williams@redhat.com>,
	John Kacur <jkacur@redhat.com>
Subject: Re: [RFC PATCH 13/17] rv: Convert the opid monitor to a hybrid
 automaton
Message-ID: <20250902092848.tscxe_nR@linutronix.de>
References: <20250814150809.140739-1-gmonaco@redhat.com>
 <20250814150809.140739-14-gmonaco@redhat.com>
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In-Reply-To: <20250814150809.140739-14-gmonaco@redhat.com>

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