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    Subject[PATCH V4 05/15] perf evlist: Add evlist__add_dummy_on_all_cpus()
    Date
    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.

    Acked-by: Namhyung Kim <namhyung@kernel.org>
    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    ---
    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 efad0e691045..48af7d379d82 100644
    --- a/tools/perf/util/evlist.c
    +++ b/tools/perf/util/evlist.c
    @@ -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;
    diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
    index 4062f5aebfc1..1bde9ccf4e7d 100644
    --- a/tools/perf/util/evlist.h
    +++ b/tools/perf/util/evlist.h
    @@ -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);
    --
    2.25.1
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