linux-kernel - [PATCH 1/7] perf stat: Initialize instead of overwriting clock event

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Message-Id: <20240813132323.98728-2-james.clark@linaro.org>
Date: Tue, 13 Aug 2024 14:23:09 +0100
From: James Clark <james.clark@...aro.org>
To: irogers@...gle.com,
	linux-perf-users@...r.kernel.org
Cc: James Clark <james.clark@...aro.org>,
	John Garry <john.g.garry@...cle.com>,
	Will Deacon <will@...nel.org>,
	Mike Leach <mike.leach@...aro.org>,
	Leo Yan <leo.yan@...ux.dev>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Yang Jihong <yangjihong1@...wei.com>,
	Ze Gao <zegao2021@...il.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 1/7] perf stat: Initialize instead of overwriting clock event

This overwrite relies on the clock event remaining at index 0 and is
quite a way down from where the array is initialized, making it easy to
miss. Just initialize it with the correct clock event to begin with.

Signed-off-by: James Clark <james.clark@...aro.org>
---
 tools/perf/builtin-stat.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1f92445f7480..a65f58f8783f 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1817,7 +1817,9 @@ static int add_default_attributes(void)
 {
 	struct perf_event_attr default_attrs0[] = {
 
-  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK		},
+  { .type = PERF_TYPE_SOFTWARE, .config = target__has_cpu(&target) ?
+						PERF_COUNT_SW_CPU_CLOCK :
+						PERF_COUNT_SW_TASK_CLOCK	},
   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES	},
   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS		},
   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS		},
@@ -2030,9 +2032,6 @@ static int add_default_attributes(void)
 
 	if (!evsel_list->core.nr_entries) {
 		/* No events so add defaults. */
-		if (target__has_cpu(&target))
-			default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
-
 		if (evlist__add_default_attrs(evsel_list, default_attrs0) < 0)
 			return -1;
 		if (perf_pmus__have_event("cpu", "stalled-cycles-frontend")) {
-- 
2.34.1