linux-kernel - Re: [PATCH perf/core 0/4] perf-probe fixes for C++

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Date:   Sun, 25 Sep 2016 13:14:21 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH perf/core 0/4] perf-probe fixes for C++

On Sat, Sep 24, 2016 at 12:34:47AM +0900, Masami Hiramatsu wrote:
> Hi,
> 
> Here is a series of patches for fixing several issues when
> probing on C++ binaries.
> 
> - Ignore inlined function definition if it has no instance [1/4]
> - Skip (inlined/normal) functions which entry address is 0 [2/4]
> - Cut off the filename for group name if it includes characters
>   which can not be used for C symbol name [3/4]
> - Search mangled symbol name from debuginfo [4/4]
> 
> So, with this series, perf-probe can handle "mangled symbol" or
> "method name" as below;
>   ----
>   $ ./perf probe -x /usr/lib64/libstdc++.so.6 \
>     -D _ZNKSt15basic_fstreamXXIwSt11char_traitsIwEE7is_openEv
>   p:probe_libstdc/_ZNKSt15basic_fstreamXXIwSt11char_traitsIwEE7is_openEv
>   /usr/lib64/libstdc++.so.6.0.22:0x8ca60
> 
>   $ ./perf probe -x /usr/lib64/libstdc++.so.6 -D is_open
>   p:probe_libstdc/is_open /usr/lib64/libstdc++.so.6.0.22:0x8ca80
>   p:probe_libstdc/is_open_1 /usr/lib64/libstdc++.so.6.0.22:0x8ca70
>   p:probe_libstdc/is_open_2 /usr/lib64/libstdc++.so.6.0.22:0x8ca60
>   p:probe_libstdc/is_open_3 /usr/lib64/libstdc++.so.6.0.22:0xb0ad0
>   p:probe_libstdc/is_open_4 /usr/lib64/libstdc++.so.6.0.22:0xecca9
>   ----
> 
> Jiri and Thomas, could you try this if you need it?

tried examples from changelogs and it works for me

Tested-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> 
> TODO:
>  - Support demangled method name(in short), like std::basic_fstream::is_open.
> 
> Thank you,
> 
> ---
> 
> Masami Hiramatsu (4):
>       perf-probe: Ignore the error of finding inline instance
>       perf-probe: Skip if the function address is 0
>       perf-probe: Fix to cut off incompatible chars from group name
>       perf-probe: Match linkage name with mangled name
> 
> 
>  tools/perf/util/dwarf-aux.c    |   28 ++++++++++++++++++++++++++--
>  tools/perf/util/dwarf-aux.h    |    3 +++
>  tools/perf/util/probe-event.c  |   10 +++++++---
>  tools/perf/util/probe-finder.c |   17 ++++++++++++++---
>  4 files changed, 50 insertions(+), 8 deletions(-)
> 
> --
> Masami Hiramatsu