linux-kernel - Re: [PATCH 0/2] perf tool: improve error handling in perf_flag

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Date:	Sat, 20 Sep 2014 14:14:38 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Yann Droneaud <ydroneaud@...eya.com>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	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>
Subject: Re: [PATCH 0/2] perf tool: improve error handling in
 perf_flag_probe()

On Sat, Sep 13, 2014 at 10:46:22AM +0200, Yann Droneaud wrote:
> Hi,
> 
> Following the EBUSY errors reported by Jiri Olsa [1], I've tryed to
> improve a bit the way perf_flag_probe() handle errors.
> 
> In case EBUSY is returned by perf_event_open(), testing the function
> again without PERF_FLAG_FD_CLOEXEC is meaningless: EBUSY is not
> related to close-on-exec flag, so there's nothing to confirm.
> 
> For other errors, not yet handled by perf_flag_probe(), it's
> pointless to report a second error message for the same error code:
> the second check should not print an error if the error is the same
> as the one return for the first check.
> 
> [1] http://lkml.kernel.org/r/1406908014-8312-1-git-send-email-jolsa@kernel.org
> 
> Yann Droneaud (2):
>   perf tools: shortcut PERF_FLAG_FD_CLOEXEC probing in case of EBUSY
>     error
>   perf tools: report PERF_FLAG_FD_CLOEXEC probing error once

seems good to me, for the patchset:
Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka
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