linux-kernel - Re: [PATCH v10 14/19] rv: Add rtapp container monitor

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Message-ID: <20250701052113.HSInwOOF@linutronix.de>
Date: Tue, 1 Jul 2025 07:21:13 +0200
From: Nam Cao <namcao@...utronix.de>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Gabriele Monaco <gmonaco@...hat.com>,
	linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
	john.ogness@...utronix.de
Subject: Re: [PATCH v10 14/19] rv: Add rtapp container monitor

On Mon, Jun 30, 2025 at 04:04:30PM -0400, Steven Rostedt wrote:
> On Tue, 10 Jun 2025 11:43:39 +0200
> Nam Cao <namcao@...utronix.de> wrote:
> > diff --git a/kernel/trace/rv/monitors/rtapp/Kconfig b/kernel/trace/rv/monitors/rtapp/Kconfig
> > new file mode 100644
> > index 0000000000000..658bb78e733a0
> > --- /dev/null
> > +++ b/kernel/trace/rv/monitors/rtapp/Kconfig
> > @@ -0,0 +1,14 @@
> > +config RV_MON_RTAPP
> > +	depends on RV
> > +	bool "rtapp monitor"
> > +	help
> > +	  Collection of monitors to check for common problems with real-time
> > +	  application that may cause unexpected latency.
> > +
> > +	  If you are developing a real-time system and not entirely sure whether
> > +	  the applications are designed correctly for real-time, you want to say
> > +	  Y here.
> > +
> > +	  Beware that enabling this may have impact on performance, even if the
> > +	  monitors are not running. Therefore you probably should say N for
> > +	  production kernel.
> 
> I'm trying to figure out from the patch how exactly does this cause
> performance issues?
> 
> Can you elaborate?

Sorry for the confusion, this patch alone doesn't affect performance.

It is its child monitor which turns on CONFIG_TRACE_IRQFLAGS, which is
added in a later patch.

Let me move this paragraph to that patch instead.

Nam