linux-kernel - Re: [PATCH 3/3] perf list: Add 'pfm' to list libpfm4 events

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Date:   Wed, 23 Sep 2020 07:45:34 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] perf list: Add 'pfm' to list libpfm4 events

HI Ian,

On Wed, Sep 23, 2020 at 5:50 AM Ian Rogers <irogers@...gle.com> wrote:
>
> On Tue, Sep 8, 2020 at 10:59 PM Namhyung Kim <namhyung@...nel.org> wrote:
> >
> > Print libpfm4 events with 'perf list pfm' command like others.
> > When libpfm4 support is not enabled, it'd print nothing.
> > Also it support glob pattern matching for event name.
> >
> >   $ perf list pfm
> >
> >   List of pre-defined events (to be used in --pfm-events):
> >
> >   ix86arch:
> >     UNHALTED_CORE_CYCLES
> >       [count core clock cycles whenever the clock signal ...
> >     INSTRUCTION_RETIRED
> >       [count the number of instructions at retirement. ...
> >     ...
> >
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> >
> > diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> > index 10ab5e40a34f..167868053fe0 100644
> > --- a/tools/perf/builtin-list.c
> > +++ b/tools/perf/builtin-list.c
> > @@ -14,6 +14,7 @@
> >  #include "util/pmu.h"
> >  #include "util/debug.h"
> >  #include "util/metricgroup.h"
> > +#include "util/pfm.h"
> >  #include <subcmd/pager.h>
> >  #include <subcmd/parse-options.h>
> >  #include <stdio.h>
> > @@ -42,7 +43,7 @@ int cmd_list(int argc, const char **argv)
> >                 OPT_END()
> >         };
> >         const char * const list_usage[] = {
> > -               "perf list [<options>] [hw|sw|cache|tracepoint|pmu|sdt|metric|metricgroup|event_glob]",
> > +               "perf list [<options>] [hw|sw|cache|tracepoint|pmu|sdt|metric|metricgroup|pfm|event_glob]",
>
> Should this be "#ifdef HAVE_LIBPFM" to avoid advertising pfm events
> when support isn't compiled in?

I thought about that too, but it's a keyword and current code
already handles it to print nothing, so I think it's ok to have.

Thanks
Namhyung