linux-kernel - Re: [PATCH] perf script: add --addr2line option

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Message-ID: <0aea2437-3ea1-4cc6-8f5e-cb4aded87fd8@foxlink.cz>
Date: Fri, 19 Jul 2024 12:54:25 +0200
From: Martin Liška <m.liska@...link.cz>
To: Ian Rogers <irogers@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
 acme@...nel.org, Martin Liska <martin.liska@....com>
Subject: Re: [PATCH] perf script: add --addr2line option



On 7/18/24 17:44, Ian Rogers wrote:
> On Thu, Jul 18, 2024 at 7:30 AM <m.liska@...link.cz> wrote:
>>
>> From: Martin Liska <martin.liska@....com>
>>
>> Similarly to other subcommands (like report, top), it would be handy to
>> provide a path for addr2line command.
> 
> Thanks Martin, lgtm but you did put a Signed-off-by tag in your commit

Hello.

You likely meant "did not", right? I'm going to fix it in V2.

> message. There is an option in git commit and git format-patch to add
> this for you.
> 
>> ---
>>  tools/perf/Documentation/perf-script.txt |  3 +++
>>  tools/perf/builtin-script.c              | 10 +++++++++-
>>  2 files changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
>> index ff086ef05a0c..5abb960c4960 100644
>> --- a/tools/perf/Documentation/perf-script.txt
>> +++ b/tools/perf/Documentation/perf-script.txt
>> @@ -369,6 +369,9 @@ OPTIONS
>>  --demangle-kernel::
>>         Demangle kernel symbol names to human readable form (for C++ kernels).
>>
>> +--addr2line=<path>::
>> +       Path to addr2line binary.
>> +
>>  --header
>>         Show perf.data header.
>>
>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>> index c16224b1fef3..301ea1c98e36 100644
>> --- a/tools/perf/builtin-script.c
>> +++ b/tools/perf/builtin-script.c
>> @@ -3897,7 +3897,7 @@ int cmd_script(int argc, const char **argv)
>>         };
>>         struct utsname uts;
>>         char *script_path = NULL;
>> -       const char *dlfilter_file = NULL;
>> +       const char *dlfilter_file = NULL, *addr2line_path = NULL;
>>         const char **__argv;
>>         int i, j, err = 0;
>>         struct perf_script script = {
>> @@ -4052,6 +4052,8 @@ int cmd_script(int argc, const char **argv)
>>                         "Enable symbol demangling"),
>>         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
>>                         "Enable kernel symbol demangling"),
>> +       OPT_STRING(0, "addr2line", &addr2line_path, "path",
> 
> Thinking out loud. I'm kind of wondering why we use a local variable
> and not just &symbol_conf.addr2line_path here. I see you've used the
> same logic that is elsewhere like builtin-top.c, so I think it is
> okay.

Yeah, you are right, we can simplify the code as suggested!

Martin

> 
> Thanks,
> Ian
> 
>> +                       "addr2line binary to use for line numbers"),
>>         OPT_STRING(0, "time", &script.time_str, "str",
>>                    "Time span of interest (start,stop)"),
>>         OPT_BOOLEAN(0, "inline", &symbol_conf.inline_name,
>> @@ -4138,6 +4140,12 @@ int cmd_script(int argc, const char **argv)
>>             itrace_synth_opts.callchain_sz > scripting_max_stack)
>>                 scripting_max_stack = itrace_synth_opts.callchain_sz;
>>
>> +       if (addr2line_path) {
>> +               symbol_conf.addr2line_path = strdup(addr2line_path);
>> +               if (!symbol_conf.addr2line_path)
>> +                       return -ENOMEM;
>> +       }
>> +
>>         /* make sure PERF_EXEC_PATH is set for scripts */
>>         set_argv_exec_path(get_argv_exec_path());
>>
>> --
>> 2.45.2
>>