evlist__find_evsel_by_str
if (!evlist__find_evsel_by_str(session->evlist,
evsel = evlist__find_evsel_by_str(session->evlist, OFFCPU_EVENT);
evsel = evlist__find_evsel_by_str(evlist, OFFCPU_EVENT);
evsel = evlist__find_evsel_by_str(evlist, name);
struct evsel *evlist__find_evsel_by_str(struct evlist *evlist, const char *str);
evswitch->on = evlist__find_evsel_by_str(evlist, evswitch->on_name);
evswitch->off = evlist__find_evsel_by_str(evlist, evswitch->off_name);