linux-kernel - Re: 'perf probe' and symbols from .text.<something>

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Message-Id: <20210223160935.82b2a9c42f637ce5449a7497@kernel.org>
Date:   Tue, 23 Feb 2021 16:09:35 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        live-patching@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Konstantin Khorenko <khorenko@...tuozzo.com>
Subject: Re: 'perf probe' and symbols from .text.<something>

Hi,

On Tue, 23 Feb 2021 00:05:08 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

>   ----
> /* Adjust symbol name and address */
> static int post_process_probe_trace_point(struct probe_trace_point *tp,
>                                            struct map *map, unsigned long offs)
> {
>         struct symbol *sym;
>         u64 addr = tp->address - offs;
> 
>         sym = map__find_symbol(map, addr);
>         if (!sym)
>                 return -ENOENT;
>   ----
> 
> So it seems "map" may not load the symbol out of ".text".
> This need to be fixed, since the map is widely used in the perf.

OK, I found a root cause of this issue.
dso__process_kernel_symbol() (which invoked from map__load() path) only adds the
symbols in ".text" section to the symbol list. It must be fixed.

Thank you,

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