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@huawei.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: https://lore.kernel.org/r/20230904023340.12707-2-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index b8b066d0dc5e45f3c9f77e21391eda00063ab790..3acbbccc19019c4baa11f82ea253daacd73f7603 100644 (file)
--- 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 3339bc2f176552734c24f3b2fb93442cf381012f..d86ffe8ed483e231e4f107decb2cdab74d91b0e1 100644 (file)
--- 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 */