linux-kernel - Re: [PATCH 1/2] perf expr: Add d

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Date:   Wed, 10 Jun 2020 11:19:49 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Paul Clarke <pc@...ibm.com>, Kajol Jain <kjain@...ux.ibm.com>,
        linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/2] perf expr: Add d_ratio operation

Em Tue, Jun 09, 2020 at 10:17:15PM -0700, Ian Rogers escreveu:
> This simplifies computing ratios in json expressions.

Appling to my local branch, Jiri, can I have your acked-by?

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/expr.l |  1 +
>  tools/perf/util/expr.y | 14 ++++++++++++--
>  2 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l
> index f397bf8b1a48..298d86660a96 100644
> --- a/tools/perf/util/expr.l
> +++ b/tools/perf/util/expr.l
> @@ -100,6 +100,7 @@ symbol		({spec}|{sym})+
>  		}
>  	}
>  
> +d_ratio		{ return D_RATIO; }
>  max		{ return MAX; }
>  min		{ return MIN; }
>  if		{ return IF; }
> diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
> index bf3e898e3055..fe145344bb39 100644
> --- a/tools/perf/util/expr.y
> +++ b/tools/perf/util/expr.y
> @@ -10,6 +10,14 @@
>  #include "smt.h"
>  #include <string.h>
>  
> +static double d_ratio(double val0, double val1)
> +{
> +	if (val1 == 0) {
> +		return 0;
> +	}
> +	return  val0 / val1;
> +}
> +
>  %}
>  
>  %define api.pure full
> @@ -28,7 +36,7 @@
>  %token <num> NUMBER
>  %token <str> ID
>  %destructor { free ($$); } <str>
> -%token MIN MAX IF ELSE SMT_ON
> +%token MIN MAX IF ELSE SMT_ON D_RATIO
>  %left MIN MAX IF
>  %left '|'
>  %left '^'
> @@ -64,7 +72,8 @@ other: ID
>  }
>  |
>  MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
> -
> +|
> +D_RATIO
>  
>  all_expr: if_expr			{ *final_val = $1; }
>  	;
> @@ -105,6 +114,7 @@ expr:	  NUMBER
>  	| MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; }
>  	| MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; }
>  	| SMT_ON		 { $$ = smt_on() > 0; }
> +	| D_RATIO '(' expr ',' expr ')' { $$ = d_ratio($3,$5); }
>  	;
>  
>  %%
> -- 
> 2.27.0.278.ge193c7cf3a9-goog
> 

-- 

- Arnaldo