linux-kernel - Re: perf probe line numbers + CONFIG_DEBUG_INFO

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Message-ID: <20180418150516.GB10084@kernel.org>
Date:   Wed, 18 Apr 2018 12:05:16 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        systemtap@...rceware.org, Mark Wielaard <mark@...mp.org>
Subject: Re: perf probe line numbers + CONFIG_DEBUG_INFO_SPLIT=y

Em Wed, Apr 18, 2018 at 11:03:01PM +0900, Masami Hiramatsu escreveu:
> And I found below description in systemtap document(man/error::dwarf.7stap).
> ===
> debuginfo configuration
> Some tools may generate debuginfo that is unsupported by systemtap, such
> as the linux kernel CONFIG_DEBUG_INFO_SPLIT (\f2.dwo\f1 files) option.
> Stick with plain ELF/DWARF (optinally split, Fedora-style), if possible.
> ===
 
> So, it seems that elfutils may not support this split debuginfo yet.

Ok, what about detecting that this is the case: .dwo is being used, as
detected by the presence of those .debug_*.dwo ELF sections and then
warning the user that this mode of operation is not supported yet?

- Arnaldo