evsel__strval
work->name = evsel__strval(evsel, sample, "name");
work->name = strdup(evsel__strval(evsel, sample, "prev_comm"));
work->name = strdup(evsel__strval(evsel, sample, "next_comm"));
const char *name = evsel__strval(evsel, sample, "name");
const char *name = evsel__strval(evsel, sample, "name");
const char *name = evsel__strval(evsel, sample, "name");
const char *name = evsel__strval(evsel, sample, "name");
const char *next_comm = evsel__strval(evsel, sample, "next_comm");
const char *prev_comm = evsel__strval(evsel, sample, "prev_comm");
const char *comm = evsel__strval(evsel, sample, "comm");
const char *prev_comm = evsel__strval(evsel, sample, "prev_comm"),
*next_comm = evsel__strval(evsel, sample, "next_comm");
evsel__strval(evsel, sample, "comm"),