linux-kernel - Re: [RFC PATCH] libtraceevent: Increase libtraceevent logging when verbose

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Date:   Thu, 10 Jun 2021 11:50:00 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-trace Users <linux-trace-users@...r.kernel.org>,
        Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC PATCH] libtraceevent: Increase libtraceevent logging when verbose

On Thu, Jun 10, 2021 at 7:39 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Wed,  9 Jun 2021 23:06:43 -0700
> Ian Rogers <irogers@...gle.com> wrote:
>
> > libtraceevent has added more levels of debug printout and with changes
> > like:
> > https://lore.kernel.org/linux-trace-devel/20210507095022.1079364-3-tz.stoyanov@gmail.com
> > previously generated output like "registering plugin" is no longer
> > displayed. This change makes it so that if perf's verbose debug output
> > is enabled then the debug and info libtraceevent messages can be
> > displayed.
> > As this API isn't present in the deprecated tools version of
> > libtracevent I'm uploading this as an RFC.
>
> Thanks Ian,
>
> We need to start porting perf to using the upstream libtraceevent
> library. I think the best way to do that is what we did with trace-cmd.
> That is to have the make files check if the minimum version of
> libtraceevent is installed, and if so, use that instead of the local
> version. If it is not installed, produce a message encouraging the
> developer to install the upstream libtraceevent and warn that it will
> be using a deprecated older versino, then build the deprecated local
> version. After some time, we could simply remove it and make it a
> dependency, but I want to do that when all the main distros being used
> have it.
>
> Currently its in the latest Debian, Ubuntu, and Fedora. I also believe
> its in SUSE but have not checked. It's in Fedora 34, but it doesn't
> appear to be in Fedora 33. As that's not too old, I don't think we
> should make it a dependency as of yet.
>
> -- Steve

Thanks! Is there a way to do something like:

#if LIBTRACE_EVENT_API > 123
...
#endif

so that we can make sure perf is taking advantage of the improvements
in the libtraceevent API?

Ian