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

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Date:   Tue, 30 Mar 2021 12:42:44 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Martin Liška <mliska@...e.cz>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf annotate: add --demangle and --demangle-kernel

Em Tue, Mar 30, 2021 at 09:41:33AM +0200, Martin Liška escreveu:
> PING^2
> 
> On 3/7/21 8:23 PM, Martin Liška wrote:
> > 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@...e.cz>
> > > > > ---
> > > > >   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.

Trying to find V2

- Arnaldo