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Subject: Re: [RFC][PATCH 2/9] perf: core, remove hw_perf_event_init
From: Lin Ming <ming.m.lin@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@elte.hu>,
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Date: Tue, 11 May 2010 14:44:40 +0800
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On Tue, 2010-05-11 at 14:38 +0800, Peter Zijlstra wrote:
> On Tue, 2010-05-11 at 01:09 +0200, Frederic Weisbecker wrote:
> 
> > Which module do you have in mind that could register a pmu?
> > And I don't understand the problem with pci-hotplug.
> 
> Well, the DRM drivers for one, but basically the trend is for every
> aspect of the machine to include PMUs of some form, this includes bus
> bridges and fancy devices.

So the concept of "PMU" is really broadened here?
Not just only the performance monitoring hardware in CPU?

> 
> The point about PCI-hotplug is that GPUs live on the PCI bus and once
> they start adding their PMU drivers we need to be able to unplug them.
> 
> Same for when the PCI bridge devices start featuring PMU
> implementations.