linux-kernel - [PATCH v5 1/7] perf evlist: Add perf_evlist__go_system

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Date:   Fri, 4 Aug 2023 02:07:35 +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>,
        <james.clark@....com>, <tmricht@...ux.ibm.com>,
        <ak@...ux.intel.com>, <anshuman.khandual@....com>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH v5 1/7] perf evlist: Add perf_evlist__go_system_wide() helper

For dummy events that keep tracking, we may need to modify its cpu_maps.
For example, change the cpu_maps to record sideband events for all CPUS.
Add perf_evlist__go_system_wide() helper to support this scenario.

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/lib/perf/evlist.c                  | 9 +++++++++
 tools/lib/perf/include/internal/evlist.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index b8b066d0dc5e..3acbbccc1901 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -738,3 +738,12 @@ int perf_evlist__nr_groups(struct perf_evlist *evlist)
 	}
 	return nr_groups;
 }
+
+void perf_evlist__go_system_wide(struct perf_evlist *evlist, struct perf_evsel *evsel)
+{
+	if (!evsel->system_wide) {
+		evsel->system_wide = true;
+		if (evlist->needs_map_propagation)
+			__perf_evlist__propagate_maps(evlist, evsel);
+	}
+}
diff --git a/tools/lib/perf/include/internal/evlist.h b/tools/lib/perf/include/internal/evlist.h
index 3339bc2f1765..d86ffe8ed483 100644
--- a/tools/lib/perf/include/internal/evlist.h
+++ b/tools/lib/perf/include/internal/evlist.h
@@ -135,4 +135,6 @@ int perf_evlist__id_add_fd(struct perf_evlist *evlist,
 void perf_evlist__reset_id_hash(struct perf_evlist *evlist);
 
 void __perf_evlist__set_leader(struct list_head *list, struct perf_evsel *leader);
+
+void perf_evlist__go_system_wide(struct perf_evlist *evlist, struct perf_evsel *evsel);
 #endif /* __LIBPERF_INTERNAL_EVLIST_H */
-- 
2.30.GIT