linux-kernel - failed to add c++ probe

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Message-ID: <20160919095402.GA2306@krava>
Date:   Mon, 19 Sep 2016 11:54:02 +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,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>
Subject: failed to add c++ probe

hi,
Thomas reported failure to add an uprobe on libstdc++.so.6 like:

[jolsa@...va perf]$ sudo ./perf probe -x /usr/lib64/libstdc++.so.6 'std::ostream::flush'
Semantic error :There is non-digit char in line number.
  Error: Command Parse Error.

it does not work also if I use the mangled name like:

[jolsa@...va perf]$ sudo ./perf probe -x /usr/lib64/libstdc++.so.6 '_ZSt5flushIwSt11char_traitsIwEERSt13basic_ostreamIT_T0_ES6_'
Probe point '_ZSt5flushIwSt11char_traitsIwEERSt13basic_ostreamIT_T0_ES6_' not found.
  Error: Failed to add events.

thanks,
jirka