linux-kernel - Re: [PATCH 2/3] perf, tool: Enable grouping logic for parsed events

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Date:	Wed, 4 Jul 2012 19:34:07 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	andi@...stfloor.org, drepper@...il.com
Subject: Re: [PATCH 2/3] perf, tool: Enable grouping logic for parsed events

On Tue, Jul 03, 2012 at 09:58:44AM +0900, Namhyung Kim wrote:
> On Mon, 2 Jul 2012 12:10:10 +0200, Jiri Olsa wrote:
> > On Mon, Jul 02, 2012 at 11:13:56AM +0900, Namhyung Kim wrote:
> >> On Fri, 29 Jun 2012 11:08:26 +0200, Jiri Olsa wrote:
> >> > It's possible to use standard event modifier for a group, which spans
> >> > over all events in the group and overrides any event modifier settings,
> >> > for example:
> >> >
> >> >   # perf record -r '{faults:k,cache-references}:u'
> >> >
> >> > resulting in ':u' modifier being used for both 'faults' and 'cache-references'
> >> > events, regardless of their modifier setup (':k' for faults event).
> >> >
> >> 
> >> So the faults event would get only 'u' for the modifier not 'uk', right?
> >
> > right
> >
> 
> I was thinking about the combining the modifiers - i.e. make it 'uk'
> above. Not sure it's useful in general, but something like "adding 'p'
> to the leader (only)" looks good to have IMHO.

just hit the issue with leader 'p' during tests ;) but still not sure which
way is more usefull thought.. probably better to have both ways available

how about uppercase group modifier overwrites, lowercase means combining

or any other way.. ;) thoughts?

jirka

> 
> Thanks,
> Namhyung
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