linux-kernel - Re: [RFC][PATCH 2/9] perf: core, remove hw_perf_event

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Message-Id: <1273560280.30322.12.camel@minggr.sh.intel.com>
Date:	Tue, 11 May 2010 14:44:40 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Paul Mundt <lethal@...ux-sh.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 2/9] perf: core, remove hw_perf_event_init

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.

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