linux-kernel - Re: I.2

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Message-ID: <19008.37301.779108.964118@cargo.ozlabs.ibm.com>
Date:	Tue, 23 Jun 2009 18:26:29 +1000
From:	Paul Mackerras <paulus@...ba.org>
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>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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>
Subject: Re: I.2 - Grouping

stephane eranian writes:

> What happens if I do:
>    fd0 = perf_counter_open(&hwc1, getpid(), -1, -1, 0);
>    fd1 = perf_counter_open(&hwc2, getpid(), -1, fd0, 0);
> 
> And then:
>    fd2 = perf_counter_open(&hwc2, getpid(), -1, fd1, 0);

That perf_counter_open call will fail with an EINVAL error because fd1
is not a group leader.

Paul.
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