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

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Date:   Wed, 10 Jun 2020 13:43:04 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.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 Wed, Jun 10, 2020 at 05:41:29PM +0200, Jiri Olsa escreveu:
> On Tue, Jun 09, 2020 at 10:17:15PM -0700, Ian Rogers wrote:
> > This simplifies computing ratios in json expressions.
> 
> please put in the comment some usage example and add
> a test for this to tests/expr.c
> 
> same for the '<>' operators in the other patch
> 
> I'll put documentation on this together with the rest to
> stat man page with my other changes, so no need to document
> this, but at least bit more details in changelog ;-)

Removed those from my local branch, pushed what I have to tmp.perf/core

- Arnaldo
 
> thanks,
> jirka
> 
> > 
> > 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