With 'perf record --switch-output' without -a, record__synthesize() in record__switch_output() won't generate tracking events because there's no thread_map in evlist. Which causes newly created perf.data doesn't contain map and comm information.
This patch creates a fake thread_map and directly call perf_event__synthesize_thread_map() for those events. Signed-off-by: Wang Nan <[email protected]> Signed-off-by: He Kuang <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Masami Hiramatsu <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Zefan Li <[email protected]> Cc: [email protected] --- tools/perf/builtin-record.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index de51134..e6a8b31 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -567,6 +567,23 @@ record__switch_output(struct record *rec, bool at_exit) perf_session__create_kernel_maps(rec->session); perf_session__set_id_hdr_size(rec->session); record__synthesize(rec); + + if (target__none(&rec->opts.target)) { + struct { + struct thread_map map; + struct thread_map_data map_data; + } thread_map; + + thread_map.map.nr = 1; + thread_map.map.map[0].pid = rec->evlist->workload.pid; + thread_map.map.map[0].comm = NULL; + perf_event__synthesize_thread_map(&rec->tool, + &thread_map.map, + process_synthesized_event, + &rec->session->machines.host, + rec->opts.sample_address, + rec->opts.proc_map_timeout); + } } return fd; } -- 1.8.3.4
