linux-kernel - [PATCH v1 02/14] perf intel-tpebs: Rename tpebs_start to evsel__tpebs

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Message-ID: <20250324223452.208081-3-irogers@google.com>
Date: Mon, 24 Mar 2025 15:34:40 -0700
From: Ian Rogers <irogers@...gle.com>
To: 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>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Weilin Wang <weilin.wang@...el.com>, 
	James Clark <james.clark@...aro.org>, Xu Yang <xu.yang_2@....com>, 
	John Garry <john.g.garry@...cle.com>, Howard Chu <howardchu95@...il.com>, 
	Levi Yun <yeoreum.yun@....com>, Dominique Martinet <asmadeus@...ewreck.org>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 02/14] perf intel-tpebs: Rename tpebs_start to evsel__tpebs_open

Try to add more consistency to evsel by having tpebs_start renamed to
evsel__tpebs_open, passing the evsel that is being opened. The unusual
behavior of evsel__tpebs_open opening all events on the evlist is kept
and will be cleaned up further in later patches. The comments are
cleaned up as tpebs_start isn't called from evlist.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/evsel.c       |  2 +-
 tools/perf/util/intel-tpebs.c | 33 ++++++++++++++++-----------------
 tools/perf/util/intel-tpebs.h |  7 +++----
 3 files changed, 20 insertions(+), 22 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1974395492d7..121283f2f382 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2595,7 +2595,7 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 	struct perf_cpu cpu;
 
 	if (evsel__is_retire_lat(evsel))
-		return tpebs_start(evsel->evlist);
+		return evsel__tpebs_open(evsel);
 
 	err = __evsel__prepare_open(evsel, cpus, threads);
 	if (err)
diff --git a/tools/perf/util/intel-tpebs.c b/tools/perf/util/intel-tpebs.c
index fb28aa211a63..2b2f4b28e8ef 100644
--- a/tools/perf/util/intel-tpebs.c
+++ b/tools/perf/util/intel-tpebs.c
@@ -12,6 +12,7 @@
 #include <linux/zalloc.h>
 #include <linux/err.h>
 #include "sample.h"
+#include "counts.h"
 #include "debug.h"
 #include "evlist.h"
 #include "evsel.h"
@@ -188,18 +189,16 @@ static int tpebs_stop(void)
 	return ret;
 }
 
-/*
- * tpebs_start - start tpebs execution.
- * @evsel_list: retire_latency evsels in this list will be selected and sampled
- * to get the average retire_latency value.
- *
- * This function will be called from evlist level later when evlist__open() is
- * called consistently.
+/**
+ * evsel__tpebs_open - starts tpebs execution.
+ * @evsel: retire_latency evsel, all evsels on its list will be selected. Each
+ *         evsel is sampled to get the average retire_latency value.
  */
-int tpebs_start(struct evlist *evsel_list)
+int evsel__tpebs_open(struct evsel *evsel)
 {
 	int ret = 0;
-	struct evsel *evsel;
+	struct evsel *pos;
+	struct evlist *evsel_list = evsel->evlist;
 	char cpumap_buf[50];
 
 	/*
@@ -214,25 +213,25 @@ int tpebs_start(struct evlist *evsel_list)
 	 * Prepare perf record for sampling event retire_latency before fork and
 	 * prepare workload
 	 */
-	evlist__for_each_entry(evsel_list, evsel) {
+	evlist__for_each_entry(evsel_list, pos) {
 		int i;
 		char *name;
 		struct tpebs_retire_lat *new;
 
-		if (!evsel->retire_lat)
+		if (!pos->retire_lat)
 			continue;
 
-		pr_debug("tpebs: Retire_latency of event %s is required\n", evsel->name);
-		for (i = strlen(evsel->name) - 1; i > 0; i--) {
-			if (evsel->name[i] == 'R')
+		pr_debug("tpebs: Retire_latency of event %s is required\n", pos->name);
+		for (i = strlen(pos->name) - 1; i > 0; i--) {
+			if (pos->name[i] == 'R')
 				break;
 		}
-		if (i <= 0 || evsel->name[i] != 'R') {
+		if (i <= 0 || pos->name[i] != 'R') {
 			ret = -1;
 			goto err;
 		}
 
-		name = strdup(evsel->name);
+		name = strdup(pos->name);
 		if (!name) {
 			ret = -ENOMEM;
 			goto err;
@@ -246,7 +245,7 @@ int tpebs_start(struct evlist *evsel_list)
 			goto err;
 		}
 		new->name = name;
-		new->tpebs_name = evsel->name;
+		new->tpebs_name = pos->name;
 		list_add_tail(&new->nd, &tpebs_results);
 		tpebs_event_size += 1;
 	}
diff --git a/tools/perf/util/intel-tpebs.h b/tools/perf/util/intel-tpebs.h
index 766b3fbd79f1..88d70bb37971 100644
--- a/tools/perf/util/intel-tpebs.h
+++ b/tools/perf/util/intel-tpebs.h
@@ -5,19 +5,18 @@
 #ifndef INCLUDE__PERF_INTEL_TPEBS_H__
 #define INCLUDE__PERF_INTEL_TPEBS_H__
 
-#include "stat.h"
-#include "evsel.h"
+struct evsel;
 
 #ifdef HAVE_ARCH_X86_64_SUPPORT
 
 extern bool tpebs_recording;
-int tpebs_start(struct evlist *evsel_list);
+int evsel__tpebs_open(struct evsel *evsel);
 void tpebs_delete(void);
 int tpebs_set_evsel(struct evsel *evsel, int cpu_map_idx, int thread);
 
 #else
 
-static inline int tpebs_start(struct evlist *evsel_list __maybe_unused)
+static inline int evsel__tpebs_open(struct evsel *evsel __maybe_unused)
 {
 	return 0;
 }
-- 
2.49.0.395.g12beb8f557-goog