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

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Message-ID: <20100304211741.GB3643@elte.hu>
Date:	Thu, 4 Mar 2010 22:17:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	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


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 2010-03-04 at 16:36 +0100, Ingo Molnar wrote:
> 
> > > This should be done anyway. But it would also let you decouple ftrace trace 
> > > events from perf trace events but still let the two use the same trace 
> > > points.
> > 
> > I think the main thing would be to have a decoupled /eventfs - basically 
> > /debug/tracing/events/ moved to "/eventfs" or maybe to "/proc/events/". This 
> > would make them available more widely, and in a standardized way.
> 
> I know Greg once proposed a /tracefs directory. I don't really care how 
> things work as long as we don't lose functionality. Perhaps we should have a 
> standard tracefs dir, and have:

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/.

Thanks,

	Ingo
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