Commit 126d68fd authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf evlist: Add evlist__add_dummy_on_all_cpus() 



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: default avatarAdrian Hunter <adrian.hunter@intel.com>
Acked-by: default avatarIan Rogers <irogers@google.com>
Acked-by: default avatarNamhyung 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 82944899

tools/perf/util/evlist.c

+45 −0
Original line number Diff line number Diff line
@@ -264,6 +264,51 @@ 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;

tools/perf/util/evlist.h

+5 −0
Original line number Diff line number Diff line
@@ -114,6 +114,11 @@ int arch_evlist__add_default_attrs(struct evlist *evlist); 
struct evsel *arch_evlist__leader(struct list_head *list);



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);