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Date:	Fri, 26 Nov 2010 12:24:12 +0100
From:	Peter Zijlstra <>
To:	Stephane Eranian <>
Cc:	Lin Ming <>, Lin Ming <>,
	Ingo Molnar <>, Andi Kleen <>,
	lkml <>,
	Frederic Weisbecker <>,
	Arjan van de Ven <>
Subject: Re: [RFC PATCH 2/3 v2] perf: Implement Nehalem uncore pmu

On Fri, 2010-11-26 at 09:18 +0100, Stephane Eranian wrote:

> In the perf_event model, given that any one of the 4 cores can be used
> to program uncore events, you have no choice but to broadcast to all
> 4 cores. Each has to demultiplex and figure out which of its counters
> have overflowed.

Not really, you can redirect all these events to the first online cpu of
the node.

You can re-write event->cpu in pmu::event_init(), and register cpu
hotplug notifiers to migrate the state around.

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