From: Andi Kleen <ak@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Yann Droneaud <ydroneaud@opteya.com>,
Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
David Ahern <dsahern@gmail.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Mike Galbraith <efault@gmx.de>,
Stephane Eranian <eranian@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Michael Ellerman <michael@ellerman.id.au>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf tools: enable close-on-exec flag on perf file descriptor
Date: Mon, 6 Jan 2014 08:52:31 -0800 [thread overview]
Message-ID: <20140106165231.GF27909@tassilo.jf.intel.com> (raw)
In-Reply-To: <20140106163950.GP31570@twins.programming.kicks-ass.net>
> AFAICT its got nothing to do with threaded or not, but only with exec()
> and we do in fact call exec() quite a lot in perf.
>
> It ensures we do not leak open perf FDs into our child processes. Now
> I'm not entirely sure how we do the exec these days but I think we were
> good about not not leaking them anyway, but more paranoia never really
> hurts.
Then you can just set it with fcntl, which works everywhere,
instead of doing extra feature tests.
The atomic setup is only needed for threaded programs to avoid
races with other threads doing exec.
-Andi
--
ak@linux.intel.com -- Speaking for myself only
next prev parent reply other threads:[~2014-01-06 16:52 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-05 20:36 [PATCH v5 0/7] Getting rid of get_unused_fd() / enable close-on-exec Yann Droneaud
2014-01-05 20:36 ` [PATCHv5 1/7] ia64: use get_unused_fd_flags(0) instead of get_unused_fd() Yann Droneaud
2014-01-05 20:36 ` [PATCHv5 2/7] ppc/cell: " Yann Droneaud
2014-01-05 20:36 ` [PATCHv5 3/7] binfmt_misc: " Yann Droneaud
2014-01-05 20:36 ` [PATCHv5 4/7] file: " Yann Droneaud
2014-01-05 20:36 ` [PATCHv5 5/7] fanotify: enable close-on-exec on events' fd when requested in fanotify_init() Yann Droneaud
2014-01-20 17:15 ` Yann Droneaud
2014-01-05 20:36 ` [PATCHv5 6/7] perf: introduce a flag to enable close-on-exec in perf_event_open() Yann Droneaud
2014-01-06 9:29 ` Peter Zijlstra
2014-01-06 10:51 ` [PATCH] perf tools: enable close-on-exec flag on perf file descriptor Yann Droneaud
2014-01-06 11:24 ` Peter Zijlstra
2014-01-06 14:43 ` Arnaldo Carvalho de Melo
2014-01-06 21:01 ` Yann Droneaud
2014-01-06 21:14 ` Arnaldo Carvalho de Melo
2014-01-06 14:22 ` Jiri Olsa
2014-01-06 15:31 ` Yann Droneaud
2014-01-11 18:07 ` [PATCHv1] " Yann Droneaud
2014-01-13 10:09 ` [PATCHv2] " Yann Droneaud
2014-01-15 18:50 ` Arnaldo Carvalho de Melo
2014-01-26 21:20 ` [PATCHv3] " Yann Droneaud
2014-03-11 8:39 ` [PATCHv4] " Yann Droneaud
2014-06-02 10:56 ` [PATCHv5] " Yann Droneaud
2014-06-02 19:23 ` Jiri Olsa
2014-06-03 8:57 ` Yann Droneaud
2014-06-03 9:23 ` Adrian Hunter
2014-06-03 11:51 ` Jiri Olsa
2014-06-30 20:28 ` [PATCHv6] " Yann Droneaud
2014-07-12 23:28 ` Jiri Olsa
2014-01-06 16:27 ` [PATCH] " Andi Kleen
2014-01-06 16:39 ` Peter Zijlstra
2014-01-06 16:52 ` Andi Kleen [this message]
2014-01-06 17:15 ` Yann Droneaud
2014-01-12 18:43 ` [tip:perf/core] perf: Introduce a flag to enable close-on-exec in perf_event_open() tip-bot for Yann Droneaud
2014-01-05 20:36 ` [PATCHv5 7/7] file: remove macro get_unused_fd() Yann Droneaud
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