linux-kernel - Re: IV.1 - Support for model-specific uncore PMU

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Message-ID: <20090622115841.GP24366@elte.hu>
Date:	Mon, 22 Jun 2009 13:58:41 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	eranian@...il.com
Cc:	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>,
	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: IV.1 - Support for model-specific uncore PMU

> IV/ Open questions
>
> 1/ Support for model-specific uncore PMU monitoring capabilities
>
> Recent processors have multiple PMUs. Typically one per core and
> but also one at the socket level, e.g., Intel Nehalem. It is
> expected that this API will provide access to these PMU as well.
>
> It seems like with the current API, raw events for those PMU would
> need a new architecture-specific type as the event encoding by
> itself may not be enough to disambiguate between a core and uncore
> PMU event.
>
> How are those events going to be supported?

(Please see our reply to II.2.)
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