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

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Date:	Tue, 28 Jul 2009 11:13:16 +0200
From:	stephane eranian <eranian@...glemail.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	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

Andi,

On Tue, Jul 28, 2009 at 10:56 AM, Andi Kleen<andi@...stfloor.org> wrote:
> 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.
>

Well, the problem is that I don't where to find the POSIX spec that defines
signal types and how they should be handled in multi-threaded programs.
That would be a good starting point.

> Likely others will run into the same problem.
>
> Perhaps should define a new sigaction flag for this to make
> it all explicit.
>
That's probably a clean way of doing this.
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