linux-kernel - Re: perf's handling of unfindable user symbols...

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Message-Id: <20181017172226.7274498db2bbe3431c3f4057@kernel.org>
Date:   Wed, 17 Oct 2018 17:22:26 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:     David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
        acme@...nel.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: perf's handling of unfindable user symbols...

On Tue, 16 Oct 2018 15:45:06 -0300
Arnaldo Carvalho de Melo <acme@...hat.com> wrote:

> 
> So, I thought something had changed and in the past we would somehow
> find that address in the kallsyms, but I couldn't find anything to back
> that up, the patch introducing this is over a decade old, lots of things
> changed, so I was just thinking I was missing something.
> 
> I tried a gtod busy loop to generate vdso activity and added a 'perf
> probe' at that branch, on x86_64 to see if it ever gets hit:
> 
> Made thread__find_map() noinline, as 'perf probe' in lines of inline
> functions seems to not be working, only at function start. (Masami?)

Thank you for reporting it. Hmm, what happened when you did it?
I checked some points, but seems no problem.
(Would you see no line number? or defined event didn't work?)

Thank you,



-- 
Masami Hiramatsu <mhiramat@...nel.org>