From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: eranian@gmail.com
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Robert Richter <robert.richter@amd.com>,
Paul Mackerras <paulus@samba.org>,
Andi Kleen <andi@firstfloor.org>,
Maynard Johnson <mpjohn@us.ibm.com>, Carl Love <cel@us.ibm.com>,
Corey J Ashford <cjashfor@us.ibm.com>,
Philip Mucci <mucci@eecs.utk.edu>,
Dan Terpstra <terpstra@eecs.utk.edu>,
perfmon2-devel <perfmon2-devel@lists.sourceforge.net>,
Michael Kerrisk <mtk.manpages@googlemail.com>,
oleg <oleg@redhat.com>
Subject: Re: perf_counters issue with self-sampling threads
Date: Wed, 29 Jul 2009 14:46:05 +0200 [thread overview]
Message-ID: <1248871565.6987.3087.camel@twins> (raw)
In-Reply-To: <7c86c4470907290537q42195dc6s61d0f6d4a3a70154@mail.gmail.com>
On Wed, 2009-07-29 at 14:37 +0200, stephane eranian wrote:
>
> >
> > Now I was considering teaching send_sigio_to_task() to use
> > specific_send_sig_info() when fown->pid != fown->group_leader->pid or
> > something, but I'm not sure that won't break anything.
> >
> Yes, that's the problem with touching this. I don't know if this will break
> things. That's why I was suggested creating a parallel code path which
> does what we want without modifying the existing path. Unless you know
> some signal expert at redhat or elsewhere.
His name is Oleg, and he's on CC ;-)
> > Alternatively, I've missed a detail and I either read the manpage wrong,
> > or the code, or both of them.
> >
> The code does not correspond to the manpage. Not clear which one
> is correct though. This F_SETOWN trick looks very Linux specific.
Linus specific sounds good enough to me. Michael might have something so
say on this though...
next prev parent reply other threads:[~2009-07-29 12:43 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-27 16:51 perf_counters issue with self-sampling threads stephane eranian
2009-07-27 16:56 ` Peter Zijlstra
2009-07-27 21:25 ` Andi Kleen
[not found] ` <7c86c4470907272213w2ee57080re50dd22a4d73a7e0@mail.gmail.com>
2009-07-28 8:51 ` stephane eranian
2009-07-28 8:56 ` Andi Kleen
2009-07-28 9:13 ` stephane eranian
2009-08-04 16:09 ` stephane eranian
2009-07-29 12:19 ` Peter Zijlstra
2009-07-29 12:37 ` stephane eranian
2009-07-29 12:46 ` Peter Zijlstra [this message]
2009-07-29 22:17 ` Oleg Nesterov
2009-07-30 11:31 ` Peter Zijlstra
2009-07-30 19:20 ` Oleg Nesterov
2009-07-30 20:00 ` Peter Zijlstra
2009-07-30 20:28 ` Oleg Nesterov
2009-07-30 21:09 ` stephane eranian
2009-07-31 8:35 ` [RFC][PATCH] fcntl: F_[SG]ETOWN_TID Peter Zijlstra
2009-07-31 14:01 ` stephane eranian
2009-07-31 20:52 ` Oleg Nesterov
2009-07-31 21:11 ` Andrew Morton
2009-08-01 1:27 ` [PATCH 0/2] send_sigio/do_send_sig_info (Was: [RFC][PATCH] fcntl: F_[SG]ETOWN_TID) Oleg Nesterov
2009-08-03 15:48 ` [PATCH 3/2] fcntl: F_[SG]ETOWN_TID Peter Zijlstra
2009-08-03 17:16 ` Oleg Nesterov
2009-08-03 17:47 ` Peter Zijlstra
2009-08-03 18:06 ` Oleg Nesterov
2009-08-03 18:36 ` Peter Zijlstra
2009-08-03 19:02 ` Oleg Nesterov
2009-08-04 11:39 ` [PATCH 3/2 -v3] fcntl: F_[SG]ETOWN_EX Peter Zijlstra
2009-08-04 16:20 ` Oleg Nesterov
2009-08-04 16:52 ` Peter Zijlstra
2009-08-04 17:19 ` Oleg Nesterov
2009-08-06 13:14 ` [PATCH 3/2 -v4] " Peter Zijlstra
2009-08-06 19:05 ` Oleg Nesterov
2009-08-07 12:10 ` stephane eranian
2009-08-01 1:28 ` [PATCH 1/2] signals: introduce do_send_sig_info() helper Oleg Nesterov
2009-08-01 1:28 ` [PATCH 2/2] signals: send_sigio: use do_send_sig_info() to avoid check_kill_permission() Oleg Nesterov
2009-08-03 12:53 ` [RFC][PATCH] fcntl: F_[SG]ETOWN_TID stephane eranian
2009-08-09 5:46 ` F_SETOWN_TID: F_SETOWN was thread-specific for a while Jamie Lokier
2009-08-10 12:22 ` stephane eranian
2009-08-10 17:03 ` Oleg Nesterov
2009-08-10 21:01 ` stephane eranian
2009-08-17 17:16 ` Oleg Nesterov
2009-08-17 17:40 ` Oleg Nesterov
2009-08-17 22:26 ` stephane eranian
2009-08-18 11:45 ` Oleg Nesterov
2009-08-20 10:00 ` stephane eranian
2009-08-11 13:10 ` Jamie Lokier
2009-08-17 17:05 ` Oleg Nesterov
2009-08-03 15:21 ` [RFC][PATCH] fcntl: F_[SG]ETOWN_TID Peter Zijlstra
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