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

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Message-ID: <20090728085635.GD15310@basil.fritz.box>
Date:	Tue, 28 Jul 2009 10:56:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	eranian@...il.com
Cc:	Andi Kleen <andi@...stfloor.org>,
	perfmon2-devel <perfmon2-devel@...ts.sourceforge.net>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Robert Richter <robert.richter@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Mackerras <paulus@...ba.org>, Carl Love <cel@...ibm.com>,
	Corey J Ashford <cjashfor@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Philip Mucci <mucci@...s.utk.edu>,
	Dan Terpstra <terpstra@...s.utk.edu>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: perf_counters issue with self-sampling threads

On Tue, Jul 28, 2009 at 10:51:04AM +0200, stephane eranian wrote:
> [Reposting the message because of stupid MIME-encoding error on my part]
> Andi,
> 
> Looks like SIGPROF is calling _group_send_sig_info(), so I
> think it is subject to the same problem.

So sounds like a whole class of signals can't be POSIX compliant.

Likely others will run into the same problem.

Perhaps should define a new sigaction flag for this to make
it all explicit.

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only.
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