linux-kernel - Re: [PATCH v1 1/6] perf annotate: Delete session for debug builds

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Date:   Wed, 29 Mar 2023 17:13:17 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, James Clark <james.clark@....com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        Sandipan Das <sandipan.das@....com>,
        Andres Freund <andres@...razel.de>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v1 1/6] perf annotate: Delete session for debug builds

On Wed, Mar 29, 2023 at 6:18 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Wed, Mar 29, 2023 at 10:09:48AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Tue, Mar 28, 2023 at 04:55:38PM -0700, Ian Rogers escreveu:
> > > Use the debug build indicator as the guide to free the session. This
> > > implements a behavior described in a comment, which is consequentially
> > > removed.
> > >
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > ---
> > >  tools/perf/builtin-annotate.c | 16 ++++++----------
> > >  1 file changed, 6 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> > > index 4750fac7bf93..98d1b6379230 100644
> > > --- a/tools/perf/builtin-annotate.c
> > > +++ b/tools/perf/builtin-annotate.c
> > > @@ -692,16 +692,12 @@ int cmd_annotate(int argc, const char **argv)
> > >
> > >  out_delete:
> > >     /*
> > > -    * Speed up the exit process, for large files this can
> > > -    * take quite a while.
> > > -    *
> > > -    * XXX Enable this when using valgrind or if we ever
> > > -    * librarize this command.
> > > -    *
> > > -    * Also experiment with obstacks to see how much speed
> > > -    * up we'll get here.
> > > -    *
> > > -    * perf_session__delete(session);
> > > +    * Speed up the exit process by only deleting for debug builds. For
> > > +    * large files this can save time.
> > >      */
> > > +#ifndef NDEBUG
> > > +   perf_session__delete(annotate.session);
> > > +#endif
> >
> > So now, but default, we will call this, as we don't have this defined
> > only if DEBUG=1 is set, right?
> >
> > ⬢[acme@...lbox perf-tools-next]$ find tools/perf/ -type f | xargs grep NDEBUG
> > tools/perf/util/mutex.c:#ifndef NDEBUG
> > ⬢[acme@...lbox perf-tools-next]$
>
> We can discuss this later, applied the series with just that zfree()
> change to annotation_options__exit().

I don't think it's just an issue in the perf annotate.  Maybe we can
do the same for perf report and so on.

Anyway we could define NDEBUG=1 for release builds from now on.

Thanks,
Namhyung