linux-kernel - Re: I.2

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Date:	Tue, 23 Jun 2009 09:24:57 -0700
From:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
To:	eranian@...il.com
CC:	Paul Mackerras <paulus@...ba.org>, 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 wrote:
> On Tue, Jun 23, 2009 at 10:26 AM, Paul Mackerras<paulus@...ba.org> wrote:
>> 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.
>>
> Okay. Thanks.
> 
> But that leads me to another question related to grouping
> which was hinted for by Peter's comment about IBS.
> 
> Can you have multiple sampling events in a group?

There's a PAPI ctest which exercises this - profile_two_events - and it 
does work with the PCL substrate.

- Corey


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