linux-kernel - Re: [tip:perf/urgent] perf sched: Fix list of events, dropping unsupported ':r' modifier

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Date:	Wed, 03 Aug 2011 13:42:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, eranian@...gle.com,
	linux-kernel@...r.kernel.org, acme@...hat.com,
	robert.richter@....com, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf sched: Fix list of events, dropping
 unsupported ':r' modifier

On Wed, 2011-08-03 at 13:37 +0200, Frederic Weisbecker wrote:
> On Wed, Aug 03, 2011 at 12:59:21PM +0200, Peter Zijlstra wrote:
> > On Fri, 2011-01-14 at 07:25 +0000, tip-bot for Stephane Eranian wrote:
> > > Looks to me like the :r modifier is not supported anymore, so remove it from
> > > the list of events. 
> > 
> > acme, why is that anyway? -R is a fun way to save some typing, but not
> > supporting :r anymore takes away the option of not getting
> > PERF_SAMPLE_RAW output for every event.
> 
> Because it was very non obvious for people to select this -R or :r
> every time they wanted to use trace events for tracing. I think
> there was complaints about that. Moreover nobody seemed to use
> trace events for non-tracing (perf report, top, annotate, ...)
> so we decided to always have RAW records so that it works for
> every cases...unless we lose events because of that.
> 
> We can still bring an option to force disabling of raw records.

That just doesn't compute, they still have to use -R, so what's the harm
in also having :r?

Also taking away options just because it confuses people sounds like
gnome, lets just not go there.
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