linux-kernel - Re: perf_counters issue with PERF_SAMPLE

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Message-ID: <20090812090234.GB14114@elte.hu>
Date:	Wed, 12 Aug 2009 11:02:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	eranian@...il.com, 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>
Subject: Re: perf_counters issue with PERF_SAMPLE_GROUP


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Tue, 2009-08-11 at 23:08 +0200, stephane eranian wrote:
> 
> > But aren't you going to change the cpu, pid target stuff we 
> > discussed a couple of weeks ago anyway?
> 
> Right, I'd like to, but Ingo doesn't. I haven't heard back from 
> Paul on this.

Not sure we want to change it. Mixing PID and CPU into the same 
space disallows the simultaneous application of both. I.e. right now 
we allow 3 models:

 - PID-ish
 - CPU-ish
 - PID and CPU [say measure CPU#2 component of an inherited workload.]

Also, i dont really see the use-cases for new targets. (i've seen a 
few mentioned but none seemed valid) What new targets do people have 
in mind?

	Ingo
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