linux-kernel - Re: [PATCH 03/19] perf record: Improve write

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Date:	Sun, 20 Oct 2013 22:43:16 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 03/19] perf record: Improve write_output error message

On Fri, Oct 18, 2013 at 03:29:00PM +0300, Adrian Hunter wrote:
> Improve the error message from write_output() to say
> what failed to write and give the error number.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/builtin-record.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 92ca541..d269dfa 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -88,7 +88,7 @@ static int write_output(struct perf_record *rec, void *buf, size_t size)
>  		int ret = write(rec->output, buf, size);
>  
>  		if (ret < 0) {
> -			pr_err("failed to write\n");
> +			pr_err("failed to write perf data, error: %m\n");

is this some kind of format magic? ;-) you wanted
to print out 'ret' value, right?

jirka
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