linux-kernel - [PATCH 1/5] perf evlist: Export perf_evlist__propagate

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Message-ID: <20230704074217.240939-2-yangjihong1@huawei.com>
Date:   Tue, 4 Jul 2023 07:42:13 +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 1/5] perf evlist: Export perf_evlist__propagate_maps()

For dummy events that keep tracking, we may need to modify its cpu_maps.
For example, change the cpu_maps to track side-band events for all CPUS.
Export perf_evlist__propagate_maps () to support this scenario.

No functional change.

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/lib/perf/evlist.c              | 23 +++++++++--------------
 tools/lib/perf/include/perf/evlist.h |  2 ++
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index b8b066d0dc5e..a3057b692530 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -33,8 +33,8 @@ void perf_evlist__init(struct perf_evlist *evlist)
 	perf_evlist__reset_id_hash(evlist);
 }
 
-static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
-					  struct perf_evsel *evsel)
+void perf_evlist__propagate_maps(struct perf_evlist *evlist,
+				 struct perf_evsel *evsel)
 {
 	if (evsel->system_wide) {
 		/* System wide: set the cpu map of the evsel to all online CPUs. */
@@ -78,16 +78,6 @@ static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
 	evlist->all_cpus = perf_cpu_map__merge(evlist->all_cpus, evsel->cpus);
 }
 
-static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
-{
-	struct perf_evsel *evsel;
-
-	evlist->needs_map_propagation = true;
-
-	perf_evlist__for_each_evsel(evlist, evsel)
-		__perf_evlist__propagate_maps(evlist, evsel);
-}
-
 void perf_evlist__add(struct perf_evlist *evlist,
 		      struct perf_evsel *evsel)
 {
@@ -96,7 +86,7 @@ void perf_evlist__add(struct perf_evlist *evlist,
 	evlist->nr_entries += 1;
 
 	if (evlist->needs_map_propagation)
-		__perf_evlist__propagate_maps(evlist, evsel);
+		perf_evlist__propagate_maps(evlist, evsel);
 }
 
 void perf_evlist__remove(struct perf_evlist *evlist,
@@ -175,6 +165,8 @@ void perf_evlist__set_maps(struct perf_evlist *evlist,
 			   struct perf_cpu_map *cpus,
 			   struct perf_thread_map *threads)
 {
+	struct perf_evsel *evsel;
+
 	/*
 	 * Allow for the possibility that one or another of the maps isn't being
 	 * changed i.e. don't put it.  Note we are assuming the maps that are
@@ -192,7 +184,10 @@ void perf_evlist__set_maps(struct perf_evlist *evlist,
 		evlist->threads = perf_thread_map__get(threads);
 	}
 
-	perf_evlist__propagate_maps(evlist);
+	evlist->needs_map_propagation = true;
+
+	perf_evlist__for_each_evsel(evlist, evsel)
+		perf_evlist__propagate_maps(evlist, evsel);
 }
 
 int perf_evlist__open(struct perf_evlist *evlist)
diff --git a/tools/lib/perf/include/perf/evlist.h b/tools/lib/perf/include/perf/evlist.h
index e894b770779e..d5a2569b2177 100644
--- a/tools/lib/perf/include/perf/evlist.h
+++ b/tools/lib/perf/include/perf/evlist.h
@@ -48,4 +48,6 @@ LIBPERF_API struct perf_mmap *perf_evlist__next_mmap(struct perf_evlist *evlist,
 
 LIBPERF_API void perf_evlist__set_leader(struct perf_evlist *evlist);
 LIBPERF_API int perf_evlist__nr_groups(struct perf_evlist *evlist);
+LIBPERF_API void perf_evlist__propagate_maps(struct perf_evlist *evlist,
+					     struct perf_evsel *evsel);
 #endif /* __LIBPERF_EVLIST_H */
-- 
2.30.GIT