linux-kernel - Re: sysfs: Add an 'events' class. (was: Re: [RFC][PATCH] perf: sysfs type id)

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Date:	Wed, 10 Nov 2010 16:00:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	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>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: sysfs: Add an 'events' class. (was: Re: [RFC][PATCH] perf: sysfs
 type id)


* Kay Sievers <kay.sievers@...y.org> wrote:

> > Same here - calling events a 'bus' is like totally brain-dead IMHO. It implies 
> > something hardware, while many events are not related to any hardware component 
> > but are pure software abstractions: such as context-switches, or syscall 
> > entries, or VM events.
> 
> Please use a bus, regardless of the name, class is dead and you will need stuff 
> tha can only happen at bus. We'll fix the name later.

When is that 'later' supposed to happen? git annotate says that the 
renaming/unification comments/plans were added:

46336009        (Kay Sievers    2007-06-08 13:36:37 -0700       105)  symlinks pointing to the unified /sys/devices tree.

... about 3 and a half years ago.

> [...] No, /sys/devices/ is and stays as a hierarchy and will not be flat.

Great :-)

Btw., where will thinks like /sys/kernel/slab/ end up? It would be useful (in the 
long run) to have:

  /sys/kernel/slab/uid_cache/events/

To describe/control events for the uid_cache SLAB cache alone.

	Ingo
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