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

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Message-Id: <1248984003.4164.0.camel@laptop>
Date:	Thu, 30 Jul 2009 22:00:03 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	eranian@...il.com, 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>,
	roland <roland@...hat.com>
Subject: Re: perf_counters issue with self-sampling threads

On Thu, 2009-07-30 at 21:20 +0200, Oleg Nesterov wrote:

> Yes, this allows to send a private signal to sub-thread.
> 
> But this is a bit strange, because the user can't specify it wants
> a thread-specific signal to the main thread, its tid == pid.

Ah, indeed. I'll make a patch for F_SETOWN_TID then, unless someone
comes up with a better name for the creature ;-)

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