linux-kernel - [PATCH 2/5] perf evlist: Add evlist__findnew_tracking

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Date:   Tue, 4 Jul 2023 07:42:14 +0000
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH 2/5] perf evlist: Add evlist__findnew_tracking_event() helper

Currently, intel-bts, intel-pt, and arm-spe may add a dummy event for
tracking to the evlist. We may need to search for the dummy event for
some settings. Therefore, add evlist__findnew_tracking_event() helper.

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/builtin-record.c | 11 +++--------
 tools/perf/util/evlist.c    | 17 +++++++++++++++++
 tools/perf/util/evlist.h    |  1 +
 3 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index aec18db7ff23..8872cd037f2c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1295,14 +1295,9 @@ static int record__open(struct record *rec)
 	 */
 	if (opts->target.initial_delay || target__has_cpu(&opts->target) ||
 	    perf_pmus__num_core_pmus() > 1) {
-		pos = evlist__get_tracking_event(evlist);
-		if (!evsel__is_dummy_event(pos)) {
-			/* Set up dummy event. */
-			if (evlist__add_dummy(evlist))
-				return -ENOMEM;
-			pos = evlist__last(evlist);
-			evlist__set_tracking_event(evlist, pos);
-		}
+		pos = evlist__findnew_tracking_event(evlist);
+		if (!pos)
+			return -ENOMEM;
 
 		/*
 		 * Enable the dummy event when the process is forked for
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 7ef43f72098e..4621ddaeb8f3 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1694,6 +1694,23 @@ void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_ev
 	tracking_evsel->tracking = true;
 }
 
+struct evsel *evlist__findnew_tracking_event(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evsel = evlist__get_tracking_event(evlist);
+	if (!evsel__is_dummy_event(evsel)) {
+		/* Set up dummy event. */
+		if (evlist__add_dummy(evlist))
+			return NULL;
+
+		evsel = evlist__last(evlist);
+		evlist__set_tracking_event(evlist, evsel);
+	}
+
+	return evsel;
+}
+
 struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str)
 {
 	struct evsel *evsel;
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 664c6bf7b3e0..4d28c50ba842 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -387,6 +387,7 @@ bool evlist_cpu_iterator__end(const struct evlist_cpu_iterator *evlist_cpu_itr);
 
 struct evsel *evlist__get_tracking_event(struct evlist *evlist);
 void evlist__set_tracking_event(struct evlist *evlist, struct evsel *tracking_evsel);
+struct evsel *evlist__findnew_tracking_event(struct evlist *evlist);
 
 struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str);
 
-- 
2.30.GIT