linux-kernel - Re: [PATCHv3 0/3] perf tool: Add new event group management

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Message-ID: <CABPqkBTTZaCVTtwJZbjXGwAihKAW_PMFK0+TZUTvbOn4pnfzvA@mail.gmail.com>
Date:	Fri, 6 Jul 2012 03:42:54 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...il.com>,
	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
Subject: Re: [PATCHv3 0/3] perf tool: Add new event group management

On Fri, Jul 6, 2012 at 3:32 AM, Ulrich Drepper <drepper@...il.com> wrote:
> On Thu, Jul 5, 2012 at 12:15 PM, Stephane Eranian <eranian@...gle.com> wrote:
>> I don't understand why you actually need the :2 suffix. There can
>> only be one leader. So assume it is the first one. Users have to
>> know the first one is the leader which seems like a natural thing
>> to do for me. It would make you syntax less ugly than it already
>> is.
>
> In a blue sky world I would have done this.  In fact, this is what I
> tried before reading the sources to find out there is no group support
> so far.  But given that multiple -e options already have a meaning I
> would be hesitant to change this.

That's why I said you activate grouping via -e only when you have
the --group-events or --group-reads option in front. That would
not change the meaning of the multiple -e when none of those
group options are specified.
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