linux-kernel - Re: [PATCH] tracing: Allow creating instances with specified system events

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Message-ID: <20231205132847.74d31532@gandalf.local.home>
Date:   Tue, 5 Dec 2023 13:28:47 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Dmytro Maluka <dmaluka@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Sean Paul <seanpaul@...omium.org>,
        Arun Easi <aeasi@...vell.com>, Daniel Wagner <dwagner@...e.de>
Subject: Re: [PATCH] tracing: Allow creating instances with specified system
 events

On Tue, 5 Dec 2023 19:13:09 +0100
Dmytro Maluka <dmaluka@...omium.org> wrote:

> On Tue, Nov 28, 2023 at 12:21:17PM -0500, Steven Rostedt wrote:
> > From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> > 
> > A trace instance may only need to enable specific events. As the eventfs
> > directory of an instance currently creates all events which adds overhead,
> > allow internal instances to be created with just the events in systems
> > that they care about. This currently only deals with systems and not
> > individual events, but this should bring down the overhead of creating
> > instances for specific use cases quite bit.
> > 
> > The trace_array_get_by_name() now has another parameter "systems". This
> > parameter is a const string pointer of a comma/space separated list of
> > event systems that should be created by the trace_array. (Note if the
> > trace_array already exists, this parameter is ignored).
> > 
> > The list of systems is saved and if a module is loaded, its events will
> > not be added unless the system for those events also match the systems
> > string.
> > 
> > Note that all dynamic events are still added as they are created by the
> > user.
> > 
> > Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> > ---  
> 
> Tested-by: Dmytro Maluka <dmaluka@...omium.org>

Thanks, but I have a v2 of this patch on my local repository, as after
discussing with Masami, I decided not to allow dynamic events unless they
are specified.

I'll send the v2 out later today.

-- Steve