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    Subject[PATCH v0 34/71] perf evlist: Add perf_evlist__enable_event_idx()
    Date
    From: Adrian Hunter <adrian.hunter@intel.com>

    Add a function to enable a specific event
    within a specific perf event buffer.

    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    ---
    tools/perf/util/evlist.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
    tools/perf/util/evlist.h | 2 ++
    2 files changed, 49 insertions(+)

    diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
    index 7ae3139..e750a21 100644
    --- a/tools/perf/util/evlist.c
    +++ b/tools/perf/util/evlist.c
    @@ -350,6 +350,53 @@ int perf_evlist__enable_event(struct perf_evlist *evlist,
    return 0;
    }

    +static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,
    + struct perf_evsel *evsel, int cpu)
    +{
    + int thread, err;
    + int nr_threads = perf_evlist__nr_threads(evlist, evsel);
    +
    + if (!evsel->fd)
    + return -EINVAL;
    +
    + for (thread = 0; thread < nr_threads; thread++) {
    + err = ioctl(FD(evsel, cpu, thread),
    + PERF_EVENT_IOC_ENABLE, 0);
    + if (err)
    + return err;
    + }
    + return 0;
    +}
    +
    +static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,
    + struct perf_evsel *evsel,
    + int thread)
    +{
    + int cpu, err;
    + int nr_cpus = cpu_map__nr(evlist->cpus);
    +
    + if (!evsel->fd)
    + return -EINVAL;
    +
    + for (cpu = 0; cpu < nr_cpus; cpu++) {
    + err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);
    + if (err)
    + return err;
    + }
    + return 0;
    +}
    +
    +int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
    + struct perf_evsel *evsel, int idx)
    +{
    + bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);
    +
    + if (per_cpu_mmaps)
    + return perf_evlist__enable_event_cpu(evlist, evsel, idx);
    + else
    + return perf_evlist__enable_event_thread(evlist, evsel, idx);
    +}
    +
    static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
    {
    int nr_cpus = cpu_map__nr(evlist->cpus);
    diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
    index 2c8d068..f0ce3bf 100644
    --- a/tools/perf/util/evlist.h
    +++ b/tools/perf/util/evlist.h
    @@ -122,6 +122,8 @@ int perf_evlist__disable_event(struct perf_evlist *evlist,
    struct perf_evsel *evsel);
    int perf_evlist__enable_event(struct perf_evlist *evlist,
    struct perf_evsel *evsel);
    +int perf_evlist__enable_event_idx(struct perf_evlist *evlist,
    + struct perf_evsel *evsel, int idx);

    void perf_evlist__set_selected(struct perf_evlist *evlist,
    struct perf_evsel *evsel);
    --
    1.8.5.1


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