perf_session__write_header
perf_session__write_header(rec->session, rec->evlist, fd, true);
err = perf_session__write_header(session, rec->evlist, fd, false);
err = perf_session__write_header(session, evlist, fd, false);
err = perf_session__write_header(session, evlist, fd, true);
perf_session__write_header(perf_stat.session, evsel_list, fd, true);
err = perf_session__write_header(perf_stat.session, evsel_list,
!perf_session__write_header(session, session->evlist, data.file.fd, true));
int perf_session__write_header(struct perf_session *session,