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

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Date:   Sun, 7 Mar 2021 20:23:26 +0100
From:   Martin Liška <mliska@...e.cz>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf annotate: add --demangle and --demangle-kernel

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.
> 
> 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
>>>
>>
>