linux-kernel - Re: [PATCH 0/2] perf_events: add support for Intel fixed counter 2

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Message-ID: <1296825160.26581.652.camel@laptop>
Date:	Fri, 04 Feb 2011 14:12:40 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	eranian@...gle.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com,
	robert.richter@....com, acme@...hat.com, gorcunov@...il.com,
	ming.m.lin@...el.com
Subject: Re: [PATCH 0/2] perf_events: add support for Intel fixed counter 2

On Fri, 2011-02-04 at 14:00 +0200, Stephane Eranian wrote:

> This series of patches solves this problem by introducing a custom
> encoding for UNHALTED_REFERENCE_CYCLES (0xff3c) and improving
> the constraint infrastructure to handle events which can ONLY be
> measured on fixed counters.

Right, so the only problem I can see with this is that Intel will at
some point in the future put an actual event there.

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