5.15-stable review patch. If anyone has any objections, please let me know.
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From: Adrian Hunter adrian.hunter@intel.com
[ Upstream commit 126d68fdcabed8c2ca5ffaba785add93ef722da8 ]
Add evlist__add_dummy_on_all_cpus() to enable creating a system-wide dummy event that sets up the system-wide maps before map propagation.
For convenience, add evlist__add_aux_dummy() so that the logic can be used whether or not the event needs to be system-wide.
Signed-off-by: Adrian Hunter adrian.hunter@intel.com Acked-by: Ian Rogers irogers@google.com Acked-by: Namhyung Kim namhyung@kernel.org Cc: Alexey Bayduraev alexey.v.bayduraev@linux.intel.com Cc: Ian Rogers irogers@google.com Cc: Jiri Olsa jolsa@kernel.org Cc: Leo Yan leo.yan@linaro.org Link: https://lore.kernel.org/r/20220524075436.29144-6-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Stable-dep-of: f9cdeb58a9cf ("perf evlist: Avoid frequency mode for the dummy event") Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/evlist.c | 45 ++++++++++++++++++++++++++++++++++++++++ tools/perf/util/evlist.h | 5 +++++ 2 files changed, 50 insertions(+)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 39d294f6c3218..a75cdcf381308 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -258,6 +258,51 @@ int evlist__add_dummy(struct evlist *evlist) return 0; }
+static void evlist__add_on_all_cpus(struct evlist *evlist, struct evsel *evsel) +{ + evsel->core.system_wide = true; + + /* + * All CPUs. + * + * Note perf_event_open() does not accept CPUs that are not online, so + * in fact this CPU list will include only all online CPUs. + */ + perf_cpu_map__put(evsel->core.own_cpus); + evsel->core.own_cpus = perf_cpu_map__new(NULL); + perf_cpu_map__put(evsel->core.cpus); + evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus); + + /* No threads */ + perf_thread_map__put(evsel->core.threads); + evsel->core.threads = perf_thread_map__new_dummy(); + + evlist__add(evlist, evsel); +} + +struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide) +{ + struct evsel *evsel = evlist__dummy_event(evlist); + + if (!evsel) + return NULL; + + evsel->core.attr.exclude_kernel = 1; + evsel->core.attr.exclude_guest = 1; + evsel->core.attr.exclude_hv = 1; + evsel->core.attr.freq = 0; + evsel->core.attr.sample_period = 1; + evsel->no_aux_samples = true; + evsel->name = strdup("dummy:u"); + + if (system_wide) + evlist__add_on_all_cpus(evlist, evsel); + else + evlist__add(evlist, evsel); + + return evsel; +} + static int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs) { struct evsel *evsel, *n; diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index ec177f783ee67..decf5c944adba 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -112,6 +112,11 @@ int __evlist__add_default_attrs(struct evlist *evlist, int arch_evlist__add_default_attrs(struct evlist *evlist);
int evlist__add_dummy(struct evlist *evlist); +struct evsel *evlist__add_aux_dummy(struct evlist *evlist, bool system_wide); +static inline struct evsel *evlist__add_dummy_on_all_cpus(struct evlist *evlist) +{ + return evlist__add_aux_dummy(evlist, true); +}
int evlist__add_sb_event(struct evlist *evlist, struct perf_event_attr *attr, evsel__sb_cb_t cb, void *data);