perf evlist: Add perf_evlist__enable_event_idx()
Add a function to enable a specific event within a specific perf event
buffer.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1406786474-9306-14-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 9d863db..5dcd28c 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -355,6 +355,53 @@
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 e0084f9..106de53 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -122,6 +122,8 @@
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);