Re: [PATCH] perf annotate: add --demangle and --demangle-kernel

[Martin Liška]

Hello.

May I please remind this patch. Apparently, you applied the perf-config
counterpart of the patch as 804fd30c6bd9aec7859a0503581312834fb197f1
(in tmp.perf/core branch), but we miss setting the same via options.

Thank you,
Martin

On 2/26/21 11:01 AM, Martin Liška wrote:
> On 2/23/21 8:49 PM, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Feb 22, 2021 at 09:29:22AM +0100, Martin Liška escreveu:
> > > Perf annotate supports --symbol but it's impossible to filter
> > > a C++ symbol. With --no-demangle one can filter easily by
> > > mangled function name.
> > >
> > > Signed-off-by: Martin Liška <mliska@xxxxxxx>
> > > ---
> > >   tools/perf/Documentation/perf-annotate.txt | 7 +++++++
> > >   tools/perf/builtin-annotate.c              | 4 ++++
> > >   2 files changed, 11 insertions(+)
> > >
> > > diff --git a/tools/perf/Documentation/perf-annotate.txt b/tools/perf/Documentation/perf-annotate.txt
> > > index 1b5042f134a8..80c1be5d566c 100644
> > > --- a/tools/perf/Documentation/perf-annotate.txt
> > > +++ b/tools/perf/Documentation/perf-annotate.txt
> > > @@ -124,6 +124,13 @@ OPTIONS
> > >   --group::
> > >       Show event group information together
> > > +--demangle::
> > > +    Demangle symbol names to human readable form. It's enabled by default,
> > > +    disable with --no-demangle.
> > > +
> > > +--demangle-kernel::
> > > +    Demangle kernel symbol names to human readable form (for C++ kernels).
> > > +
> > >   --percent-type::
> > >       Set annotation percent type from following choices:
> > >         global-period, local-period, global-hits, local-hits
> > > diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> > > index a23ba6bb99b6..ef70a17b9b5b 100644
> > > --- a/tools/perf/builtin-annotate.c
> > > +++ b/tools/perf/builtin-annotate.c
> > > @@ -538,6 +538,10 @@ int cmd_annotate(int argc, const char **argv)
> > >               "Strip first N entries of source file path name in programs (with --prefix)"),
> > >       OPT_STRING(0, "objdump", &annotate.opts.objdump_path, "path",
> > >              "objdump binary to use for disassembly and annotations"),
> > > +    OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
> > > +            "Disable symbol demangling"),
> >
> > Nope, this _enables_ demangling, i.e.:
> >
> >     perf annotate --demangle
>
> Oh, yeah, you are right.
>
> > Asks for symbol demangling, while:
> >
> >     perf annotate --no-demangle
> >
> > As you correctly wrote in your commit message and on the
> > --demangle-kernel case, enables demangling.
>
> Fixed that in V2.
>
> Martin
>
> > Please consider making this configurable (if not already) via
> > ~/.perfconfig, 'perf config', sure in a followup patch.
> >
> > Thanks,
> >
> > - Arnaldo
> >
> > > +    OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
> > > +            "Enable kernel symbol demangling"),
> > >       OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
> > >               "Show event group information together"),
> > >       OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
> > > --
> > > 2.30.1