linux-kernel - Re: [PATCH 4/8] perf tools: Add formula interface to interface formula definitions

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Date:	Wed, 15 May 2013 11:13:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ulrich Drepper <drepper@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 4/8] perf tools: Add formula interface to interface
 formula definitions

On Wed, May 01, 2013 at 05:15:42PM +0200, Jiri Olsa wrote:
> Each counter (cpi/branch-rate above) defines formula that
> produces the counter number.
> 
> Formula grammar:
> 
>   expr: '-' expr       |
>         expr '+' expr  |
>         expr '-' expr  |
>         expr '*' expr  |
>         expr '/' expr  |
>         value          |
>         name
> 

I was going to suggest adding (), but then I saw

> +<expr>{
> +"*"		{ return '*'; }
> +"-"		{ return '-'; }
> +"+"		{ return '+'; }
> +"/"		{ return '/'; }
> +"("		{ return '('; }
> +")"		{ return ')'; }
> +

> +'(' expr ')'
> +{
> +	$$ = $2;
> +	pr_debug2("( %F )\n", $$);
> +}

:-)
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