linux-kernel - Re: [RFC] perf: EBNF for event syntax

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Message-ID: <4D901F58.4060902@hitachi.com>
Date:	Mon, 28 Mar 2011 14:40:40 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Lin Ming <ming.m.lin@...el.com>, mingo@...e.hu,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	"2nddept-manager@....hitachi.co.jp" 
	<2nddept-manager@....hitachi.co.jp>
Subject: Re: [RFC] perf: EBNF for event syntax

(2011/03/25 20:07), Peter Zijlstra wrote:
> On Wed, 2011-03-23 at 11:36 +0800, Lin Ming wrote:
>> Hi, all
>>
>> On Thu, Mar 17, 2011 at 2:02 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>>> How about we start writing proper EBNF syntax rules for this stuff, its
>>> getting seriously out of hand.
>> http://marc.info/?l=linux-kernel&m=130029871318866&w=2
>>
>> As Peter suggested, I wrote a simple EBNF for event syntax, as below.
>> My first plan is to pass in extra config value for some events,
>> for example, offcore response and load latency.
>>
>> perf record -e r100b(0004):p
>>
>> As above, the extra config value 0004 is passed in the parentheses.
>>
>> The EBNF
>> ========
>>
>> EventList		:=	Event [',' EventList]
> 
> There was a suggestion a while back to make:
> 
>  -e ev1,ev2,ev3
> 
> create an event group with ev2 and ev3 siblings of ev1, and have
> multiple -e instances create separate counters.
> 
> The problem is that its not backwards compatible, but something like
> that would still be very nice to have.

I doubt that we really need to define those events are
grouped at recording time, because group(event ratio)
analysis must be done at analysis time(report etc.)

IMHO, it should be done with a separate option instead of -e.

Thank you,

-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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