linux-kernel - Re: [RFC][PATCH v2 06/11] perf: core, export pmus via sysfs

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Message-ID: <1274429038.1674.1684.camel@laptop>
Date:	Fri, 21 May 2010 10:03:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Greg KH <greg@...ah.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Lin Ming <ming.m.lin@...el.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.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>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <carll@...ibm.com>,
	Kay Sievers <kay.sievers@...y.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH v2 06/11] perf: core, export pmus via sysfs

On Thu, 2010-05-20 at 16:12 -0700, Greg KH wrote:
> How deep in the device tree are you really going to be caring about?  It
> sounds like the large majority of events are only going to be coming
> from the "system" type objects (cpu, nodes, memory, etc.) and very few
> would be from things that we consider a 'struct device' today (like a
> pci, usb, scsi, or input, etc.) 

The general noise I hear from the hardware people is that we'll see more
and more device-level stuff - bus bridges/controller and actual devices
(GPUs, NICs etc.) will be wanting to export performance metrics.

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