linux-kernel - Re: [PATCH] perf tools: enable close-on-exec flag on perf file descriptor

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Message-ID: <20140106142220.GB1183@krava.brq.redhat.com>
Date:	Mon, 6 Jan 2014 15:22:20 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Yann Droneaud <ydroneaud@...eya.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Namhyung Kim <namhyung@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <michael@...erman.id.au>,
	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] perf tools: enable close-on-exec flag on perf file
 descriptor

On Mon, Jan 06, 2014 at 11:51:25AM +0100, Yann Droneaud wrote:
> In a previous patch [1][2], flag PERF_FLAG_FD_CLOEXEC was
> added to perf_event_open(2) syscall to allows userspace
> to enable close-on-exec behavor atomically when creating
> the file descriptor.
> 
> This patch makes perf tools use the new flag.
> 
> Beware that perf tools compiled with the new flag won't work
> on older kernel which do not support flag PERF_FLAG_FD_CLOEXEC.

I think we should enhance the api probe routines (perf_do_probe_api)
to detect that, than just bypass us from running on older kernels

jirka
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