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

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Message-ID: <AANLkTimb=R0aqtfL=eZpwj=KqJchHU+nhMnjk5ME9BNr@mail.gmail.com>
Date:	Tue, 9 Nov 2010 23:11:17 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	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>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC][PATCH] perf: sysfs type id

On Tue, Nov 9, 2010 at 22:45, Peter Zijlstra <peterz@...radead.org> 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/

Please use a 'bus_type' instead of 'class'.

I'm very sure, some day, you'll need global attributes for the pmu
stuff, and class -- unlike bus -- has its own subdir where you can go
wild, without mixing things with the list-of-devices. :)

No new stuff should use 'class', it's not extensible.

Kay
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