linux-kernel - Re: [PATCH 00/10] perf, x86: Add northbridge counter support for AMD family 15h

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Message-ID: <1340187373.21745.95.camel@twins>
Date:	Wed, 20 Jun 2012 12:16:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/10] perf, x86: Add northbridge counter support for
 AMD family 15h

On Wed, 2012-06-20 at 12:00 +0200, Robert Richter wrote:
> 
> And wrt counter rotation, this only affects code to assign counters.
> You don't need a separate pmu for this. 

It makes it easier though, on unplug you would otherwise need to filter
what events are uncore and migrate those to another online cpu of the
same nb instead of all events..

Also, what cpu on the NB receives the PMI?

Sure it can be done, just not pretty. Combine that with all the other
special casing like patches 3 and 10 and one really starts to wonder if
its all worth it.

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