linux-kernel - Re: [RFC][PATCH v1 06/15] perf: export tracepoint events via sysfs: iwlwifi and iwlwifi

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Message-ID: <20100723013716.GA7362@dastard>
Date:	Fri, 23 Jul 2010 11:37:16 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Johannes Berg <johannes@...solutions.net>,
	Lin Ming <ming.m.lin@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Robert Richter <robert.richter@....com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg KH <greg@...ah.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>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH v1 06/15] perf: export tracepoint events via
 sysfs: iwlwifi and iwlwifi_io

On Thu, Jul 22, 2010 at 09:54:04AM -0400, Steven Rostedt wrote:
> On Thu, 2010-07-22 at 15:48 +0200, Ingo Molnar wrote:
> > * Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > Yeah - and the point of this submission is to allow the discussion of how to 
> > achieve these registrations.
> > 
> > Driver authors will want to have some control - for example the place where 
> > the events directory shows up in sysfs within the driver's directory structure 
> > - etc.
> > 
> > But we indeed want to automate it as much as possible.
> 
> Perhaps we can create a TRACE_EVENT_PATH() macro, that allows the
> developer to specify the path that the event will be seen in sysfs?

Perhaps you could build that into the event class definition as well
so each separate class in a subsystem can be placed in it's own
sub-directory?

That would make turning on and off specific classes trace points so
much simpler than it now, espcially for XFS where we now have > 250
tracepoints that are mostly defined by event classes already...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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