linux-kernel - Re: perf_counters issue with self-sampling threads

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Message-Id: <1248871565.6987.3087.camel@twins>
Date:	Wed, 29 Jul 2009 14:46:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	eranian@...il.com
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robert Richter <robert.richter@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Andi Kleen <andi@...stfloor.org>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <cel@...ibm.com>,
	Corey J Ashford <cjashfor@...ibm.com>,
	Philip Mucci <mucci@...s.utk.edu>,
	Dan Terpstra <terpstra@...s.utk.edu>,
	perfmon2-devel <perfmon2-devel@...ts.sourceforge.net>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	oleg <oleg@...hat.com>
Subject: Re: perf_counters issue with self-sampling threads

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...

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