linux-kernel - Re: [PATCH] perf tools: Use symfs when opening debuginfo by path

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Message-ID: <CAP-5=fV4w=y5-mFdwa8_UAxPYJeqnFhdXjyVic88CKwP_XdmSg@mail.gmail.com>
Date: Wed, 12 Feb 2025 14:25:34 -0800
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, 
	LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org, 
	Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH] perf tools: Use symfs when opening debuginfo by path

On Wed, Feb 12, 2025 at 2:14 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> I found that it failed to load a binary using --symfs option.  Say I
> have a binary in /home/user/prog/xxx and a perf data file with it.  If I
> move them to a different machine and use --symfs, it tries to find the
> binary in some locations under symfs using dso__read_binary_type_filename(),
> but not the last one.
>
>   ${symfs}/usr/lib/debug/home/user/prog/xxx.debug
>   ${symfs}/usr/lib/debug/home/user/prog/xxx
>   ${symfs}/home/user/prog/.debug/xxx
>   /home/user/prog/xxx
>
> It should check ${symfs}/home/usr/prog/xxx.  Let's fix it.
>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/util/debuginfo.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/debuginfo.c b/tools/perf/util/debuginfo.c
> index 19acf4775d3587a4..b5deea7cbdf24620 100644
> --- a/tools/perf/util/debuginfo.c
> +++ b/tools/perf/util/debuginfo.c
> @@ -125,8 +125,12 @@ struct debuginfo *debuginfo__new(const char *path)
>         dso__put(dso);
>
>  out:
> +       if (dinfo)
> +               return dinfo;
> +
>         /* if failed to open all distro debuginfo, open given binary */
> -       return dinfo ? : __debuginfo__new(path);
> +       symbol__join_symfs(buf, path);
> +       return __debuginfo__new(buf);
>  }
>
>  void debuginfo__delete(struct debuginfo *dbg)
> --
> 2.48.1.502.g6dc24dfdaf-goog
>