linux-kernel - Re: [PATCH -tip 4/4] perf/probe: Improve error messages with --line option

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Message-ID: <87y4x59oam.fsf@sejong.aot.lge.com>
Date:	Tue, 10 Jun 2014 17:11:45 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH -tip 4/4] perf/probe: Improve error messages with --line option

Hi Masami,

On Fri, 06 Jun 2014 07:14:06 +0000, Masami Hiramatsu wrote:
> Improve error messages of perf probe --line mode. Current
> perf probe shows "Debuginfo analysis failed" error with an
> error code when the given symbol is not found as below.
>
>   -----
>   # perf probe -L page_cgroup_init_flatmem
>   Debuginfo analysis failed. (-2)
>     Error: Failed to show lines.
>   -----
>
> But -2 (-ENOMEM) means that the given source line or function

s/ENOMEM/ENOENT/

Thanks,
Namhyung


> is not found. With this patch, perf probe shows correct error
> message as below.
>
>   -----
>   # perf probe -L page_cgroup_init_flatmem
>   Specified source line is not found.
>     Error: Failed to show lines.
>   -----
>
> There is also another debug error code is shown in the same
> function after get_real_path(). This removes that too.
>
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> ---
>  tools/perf/util/probe-event.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 44c7141..9a0a183 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -628,11 +628,11 @@ static int __show_line_range(struct line_range *lr, const char *module)
>  
>  	ret = debuginfo__find_line_range(dinfo, lr);
>  	debuginfo__delete(dinfo);
> -	if (ret == 0) {
> +	if (ret == 0 || ret == -ENOENT) {
>  		pr_warning("Specified source line is not found.\n");
>  		return -ENOENT;
>  	} else if (ret < 0) {
> -		pr_warning("Debuginfo analysis failed. (%d)\n", ret);
> +		pr_warning("Debuginfo analysis failed.\n");
>  		return ret;
>  	}
>  
> @@ -641,7 +641,7 @@ static int __show_line_range(struct line_range *lr, const char *module)
>  	ret = get_real_path(tmp, lr->comp_dir, &lr->path);
>  	free(tmp);	/* Free old path */
>  	if (ret < 0) {
> -		pr_warning("Failed to find source file. (%d)\n", ret);
> +		pr_warning("Failed to find source file path.\n");
>  		return ret;
>  	}
>  
--
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