linux-kernel - Re: [RFC][PATCH 2/3] perf: Take a hot regs snapshot for trace events

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Date:	Thu, 4 Mar 2010 22:37:28 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Greg KH <greg@...ah.com>
Subject: Re: [RFC][PATCH 2/3] perf: Take a hot regs snapshot for trace
	events

On Thu, Mar 04, 2010 at 04:30:38PM -0500, Steven Rostedt wrote:
> On Thu, 2010-03-04 at 22:17 +0100, Ingo Molnar wrote:
> > * Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> 
> > No, we want to decouple it from 'tracing'. It's events, not tracing. Events 
> > are more broader, they can be used for RAS, profiling, counting, etc. - not 
> > just tracing.
> > 
> > Furthermore, we only want /debug/tracing/events really, not the various 
> > dynamic ftrace controls - those could remain in /debug/tracing/.
> 
> I was talking about the files in the events directory:
> 
> events/sched/sched_switch/{id,format,enable,filter}
> 
> 
> Seems only the format file should go in, and perhaps the id.
> 
> I can keep the debug/tracing/events/* as is too, where the format and id
> just call the same routines that the eventfs calls, but add the enable
> and filter to be specific to ftrace.


The /debug/tracing/events could contain symlinks for the format
files so that the rest can stay there.


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