Tracking events describe kernel and threads. They are generated by reading /proc/kallsyms, /proc/*/maps and /proc/*/task/* during initialization of 'perf record', serialized into event sequences and put at the head of 'perf.data'. In case of output switching, each output file should contain those events.
This patch calls record__synthesize() during output switching, so the event sequences described above can be collected again. 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 | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 238234e..de51134 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -529,6 +529,8 @@ record__finish_output(struct record *rec) return; } +static int record__synthesize(struct record *rec); + static int record__switch_output(struct record *rec, bool at_exit) { @@ -557,6 +559,15 @@ record__switch_output(struct record *rec, bool at_exit) if (!quiet) fprintf(stderr, "[ perf record: Dump %s.%s ]\n", file->path, timestamp); + + /* Reinit machine */ + if (!at_exit) { + machines__exit(&rec->session->machines); + machines__init(&rec->session->machines); + perf_session__create_kernel_maps(rec->session); + perf_session__set_id_hdr_size(rec->session); + record__synthesize(rec); + } return fd; } -- 1.8.3.4
