linux-kernel - Re: [PATCH] perf auxtrace: Improve address filter error message when there is no DSO

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Date:   Fri, 1 Mar 2019 14:47:55 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf auxtrace: Improve address filter error message when
 there is no DSO

Em Fri, Mar 01, 2019 at 02:29:02PM +0200, Adrian Hunter escreveu:
> The message does not indicate the possibility that the symbol is not
> found because the file does not exist.
> 
> Before:
> 
>   $ perf record -e intel_pt//u --filter 'filter strcmp / strcpy @ foo ' ls
>   Symbol 'strcmp' not found.
>   Note that symbols must be functions.
>   Failed to parse address filter: 'filter strcmp / strcpy @ foo '
>   Filter format is: filter|start|stop|tracestop <start symbol or address> [/ <end symbol or size>] [@<file name>]
>   Where multiple filters are separated by space or comma.
> 
> After:
> 
>   $ perf record -e intel_pt//u --filter 'filter strcmp / strcpy @ foo ' ls
>   File 'foo' not found or has no symbols.
>   Symbol 'strcmp' not found.
>   Note that symbols must be functions.
>   Failed to parse address filter: 'filter strcmp / strcpy @ foo '
>   Filter format is: filter|start|stop|tracestop <start symbol or address> [/ <end symbol or size>] [@<file name>]
>   Where multiple filters are separated by space or comma.

Thanks, applied.

- Arnaldo
 
> Reported-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/auxtrace.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
> index 267e54df511b..fb76b6b232d4 100644
> --- a/tools/perf/util/auxtrace.c
> +++ b/tools/perf/util/auxtrace.c
> @@ -1918,7 +1918,8 @@ static struct dso *load_dso(const char *name)
>  	if (!map)
>  		return NULL;
>  
> -	map__load(map);
> +	if (map__load(map) < 0)
> +		pr_err("File '%s' not found or has no symbols.\n", name);
>  
>  	dso = dso__get(map->dso);
>  
> -- 
> 2.17.1

-- 

- Arnaldo