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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Date:   Thu, 20 Apr 2023 16:10:30 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...hat.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>,
        "Liang, Kan" <kan.liang@...ux.intel.com>,
        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 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...

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index d3cbee7460fcc48e..e95a545f2c600810 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2169,10 +2169,8 @@ static void setup_system_wide(int forks)
 		struct evsel *counter;
 
 		evlist__for_each_entry(evsel_list, counter) {
-			if (!counter->core.requires_cpu &&
-			    strcmp(counter->name, "duration_time")) {
+			if (!counter->core.requires_cpu && evsel__name_is(counter, "duration_time"))
 				return;
-			}
 		}
 
 		if (evsel_list->core.nr_entries)