linux-kernel - Re: [RFC][PATCH] perf: sysfs type id

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Date:	Wed, 10 Nov 2010 10:36:51 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Greg KH <gregkh@...e.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Lin Ming <ming.m.lin@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	"robert.richter" <robert.richter@....com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	fweisbec <fweisbec@...il.com>, paulus <paulus@...ba.org>,
	Kay Sievers <kay.sievers@...y.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC][PATCH] perf: sysfs type id

On Tue, 2010-11-09 at 14:13 -0800, Greg KH wrote:
> On Tue, Nov 09, 2010 at 10:45:19PM +0100, Peter Zijlstra wrote:
> > The below is a RFC patch adding dynamic type ids to perf.
> > 
> > We need to represent PMUs in sysfs because we want to allow multiple
> > (loadable) PMUs and need a way to identify them.
> > 
> > This patch creates a new device class "pmu" and adds a single attribute
> > "type" to it. This device attribute will expose the dynamic type id as
> > required by perf_event_attr::type.
> > 
> > The sysfs layout looks like:
> > 
> > [root@...tmere ~]# cd /sys/class/pmu/
> 
> You missed the embedded track at Plumbers where we talked about never
> adding another class to the kernel.  Please use bus_id instead for this.

At least in the examples I've seen creating a bus requires a lot more
code than a class. Or is there a shortcut I don't know about when it's a
virtual bus?

(Interested because I have code that is using a class)

cheers


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