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

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Message-ID: <20120322124137.GF21163@infradead.org>
Date:	Thu, 22 Mar 2012 09:41:37 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/3] perf, tool: Add new event group management

Em Thu, Mar 22, 2012 at 08:56:34AM +0100, Ingo Molnar escreveu:
> 
> * Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> 
> > Em Wed, Mar 21, 2012 at 01:15:10PM +0100, Ingo Molnar escreveu:
> > > * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > > > I would much prefer a syntax that's more natural but requires 
> > > > quoting than one that's quirky and tailor made to avoid 
> > > > whatever current bash does. For one, there's other shells out 
> > > > there that might have different quoting needs and bash is of 
> > > > course free to extend its syntax.
> > > 
> > > Well, they are unlikely to extend to '+', it would break a 
> > > boatload of scripts I suspect.
> > > 
> > > So the question would be, is a+b+c as event grouping a natural 
> > > syntax? If not then lets use a quoted one that is.
> > 
> >    -e groupname=event1,event2,event3
> > 
> > Seems intuitive, no?
> 
> Hm, if there's no use for 'groupname' later on then it's a 
> needlessly unspecified dimension. If this variant is picked then 
> I'd suggest to make it a fixed:
> 
>   -e group=event1,event2,event3
> 
> kind of thing instead.

Jiri mentioned a use for the group name, no?

- Arnaldo
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