linux-kernel - Re: [PATCH] perf tools: Fix PERF_FLAG_FD_CLOEXEC flag probing event type open counters due to EBUSY error

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Date:	Wed, 06 Aug 2014 12:00:00 +0200
From:	Yann Droneaud <ydroneaud@...eya.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	William Cohen <wcohen@...hat.com>,
	Yann Droneaud <ydroneaud@...eya.com>
Subject: Re: [PATCH] perf tools: Fix PERF_FLAG_FD_CLOEXEC flag probing event
 type open counters due to EBUSY error

Hi,

Le dimanche 03 août 2014 à 14:10 +0200, Jiri Olsa a écrit :
> On Sat, Aug 02, 2014 at 07:58:25PM +0200, Yann Droneaud wrote:

> heh, I haven't realized that your probing event was
> PERF_COUNT_SW_CPU_CLOCK, which could never be busy
> and found following bug ;-)
> 
> jirka
> 
> 
> ---
> We were using PERF_COUNT_SW_CPU_CLOCK as an probing event type.
> Using expected PERF_TYPE_SOFTWARE type instead.
> 
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Namhyung Kim <namhyung@...il.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> Cc: William Cohen <wcohen@...hat.com>
> Cc: Yann Droneaud <ydroneaud@...eya.com>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/cloexec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c
> index dc360ebde745..0f7eb0a53d4b 100644
> --- a/tools/perf/util/cloexec.c
> +++ b/tools/perf/util/cloexec.c
> @@ -9,7 +9,7 @@ static int perf_flag_probe(void)
>  {
>  	/* use 'safest' configuration as used in perf_evsel__fallback() */
>  	struct perf_event_attr attr = {
> -		.type = PERF_COUNT_SW_CPU_CLOCK,
> +		.type = PERF_TYPE_SOFTWARE,
>  		.config = PERF_COUNT_SW_CPU_CLOCK,

erf ... I was even not able to copy paste correctly the configuration
used in perf_evsel__fallback(), my bad.

Thanks for the fix.

Regards.

-- 
Yann Droneaud
OPTEYA



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