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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: 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>
This commit is contained in:
Adrian Hunter 2022-05-24 10:54:26 +03:00 committed by Arnaldo Carvalho de Melo
parent 8294489914
commit 126d68fdca
2 changed files with 50 additions and 0 deletions
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45
tools/perf/util/evlist.c
View File

@ -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;

5
tools/perf/util/evlist.h
View File

@ -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);