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    Subject[PATCH 36/54] perf record: Generate tracking events for process forked by perf
    Date
    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 <wangnan0@huawei.com>
    Signed-off-by: He Kuang <hekuang@huawei.com>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Zefan Li <lizefan@huawei.com>
    Cc: pi3orama@163.com
    ---
    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
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