[PATCH 24/52] perf evlist: Add perf_evlist__enable_event_idx()

Adrian Hunter
2014-07-22T13:20:45Z

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 10514f3..8eb6e72 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -354,6 +354,53 @@ 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 657a36c..70f2676 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);
--
1.8.3.2