linux-kernel - Re: [PATCH 1/1] perf evsel: Introduce evsel__name_is() method to check if the evsel name is equal to a given string

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Message-ID: <ZEa8DWkBw6GStTzx@kernel.org>
Date:   Mon, 24 Apr 2023 14:27:41 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 1/1] perf evsel: Introduce evsel__name_is() method to
 check if the evsel name is equal to a given string

Em Mon, Apr 24, 2023 at 02:25:27PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Apr 20, 2023 at 05:16:18PM -0400, Liang, Kan escreveu:
> > 
> > 
> > On 2023-04-20 3:28 p.m., Arnaldo Carvalho de Melo wrote:
> > > Em Thu, Apr 20, 2023 at 04:10:30PM -0300, Arnaldo Carvalho de Melo escreveu:
> > >> Em Thu, Apr 20, 2023 at 03:57:55PM -0300, Arnaldo Carvalho de Melo escreveu:
> > >>> This makes the logic a bit clear by avoiding the !strcmp() pattern and
> > >>> also a way to intercept the pointer if we need to do extra validation on
> > >>> it or to do lazy setting of evsel->name via evsel__name(evsel).
> > >>
> > >> + this, looking if there are others...
> > > 
> > > Somehow the first message didn't go thru, so below is the combined
> > > patch, this is an effort to avoid accessing evsel->name directly as the
> > > preferred way to get an evsel name is evsel__name(), so looking for
> > > direct access and providing accessors that avoid that.
> > 
> > One more
> > 
> > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> > index 2260e27adf44..3a960a3f6962 100644
> > --- a/tools/perf/util/evlist.c
> > +++ b/tools/perf/util/evlist.c
> > @@ -467,7 +467,7 @@ static int evsel__strcmp(struct evsel *pos, char
> > *evsel_name)
> >  		return 0;
> >  	if (evsel__is_dummy_event(pos))
> >  		return 1;
> > -	return strcmp(pos->name, evsel_name);
> > +	return !evsel__name_is(pos, evsel_name);
> >  }
> > 
> >  static int evlist__is_enabled(struct evlist *evlist)
> 
> Added
>  
> > > 
> > > From e60455d6a4e35ba0c376966443294586a1adc3ec Mon Sep 17 00:00:00 2001
> > > From: Arnaldo Carvalho de Melo <acme@...hat.com>
> > > Date: Thu, 20 Apr 2023 15:54:11 -0300
> > > Subject: [PATCH 1/1] perf evsel: Introduce evsel__name_is() method to check if
> > >  the evsel name is equal to a given string
> > > 
> > > This makes the logic a bit clear by avoiding the !strcmp() pattern and
> > > also a way to intercept the pointer if we need to do extra validation on
> > > it or to do lazy setting of evsel->name via evsel__name(evsel).
> > > 
> > > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > > Cc: Ian Rogers <irogers@...gle.com>
> > > Cc: Jiri Olsa <jolsa@...nel.org>
> > > Cc: "Liang, Kan" <kan.liang@...ux.intel.com>
> > > Cc: Namhyung Kim <namhyung@...nel.org>
> > > Link: https://lore.kernel.org/lkml/ZEGLM8VehJbS0gP2@kernel.org
> > > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > 
> > With the above one,
> > 
> > Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
> 
> Added these extra ones and actually made evsel__name_is() use
> evsel__name().
> 
> Does your reviewed-by stands after these extra changes?


oops, fix that pos->name leftover:


diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 2260e27adf44c579..a0504316b06fbcba 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -467,7 +467,7 @@ static int evsel__strcmp(struct evsel *pos, char *evsel_name)
 		return 0;
 	if (evsel__is_dummy_event(pos))
 		return 1;
-	return strcmp(pos->name, evsel_name);
+	return !evsel__name_is(pos, evsel_name);
 }
 
 static int evlist__is_enabled(struct evlist *evlist)
@@ -1706,7 +1706,7 @@ struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str)
 	evlist__for_each_entry(evlist, evsel) {
 		if (!evsel->name)
 			continue;
-		if (strcmp(str, evsel->name) == 0)
+		if (evsel__name_is(evsel, str))
 			return evsel;
 	}
 
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 81b854650160c2b0..356c07f03be6bfce 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -823,7 +823,7 @@ const char *evsel__name(struct evsel *evsel)
 
 bool evsel__name_is(struct evsel *evsel, const char *name)
 {
-	return !strcmp(evsel->name, name);
+	return !strcmp(evsel__name(evsel), name);
 }
 
 const char *evsel__group_pmu_name(const struct evsel *evsel)
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 31b1cd0935e277ba..650cd8df40412a38 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2893,7 +2893,7 @@ static struct evsel *find_evsel(struct evlist *evlist, char *event_name)
 	full_name = !!strchr(event_name, ':');
 	evlist__for_each_entry(evlist, pos) {
 		/* case 2 */
-		if (full_name && !strcmp(pos->name, event_name))
+		if (full_name && evsel__name_is(pos, event_name))
 			return pos;
 		/* case 3 */
 		if (!full_name && strstr(pos->name, event_name)) {