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    Subject[PATCH 02/19] perf report: Display perf.data header info
    Date
    Display more header info from perf.data file,
    following values:

    $ perf report -i perf.data --header-only
    ...
    # header version : 1
    # data offset : 424
    # data size : 3364280
    # feat offset : 3364704

    It's handy for debuging.

    Link: http://lkml.kernel.org/n/tip-bdfzdy1xv8ocs6ukk31sgxsw@git.kernel.org
    Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    ---
    tools/perf/util/header.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
    index a326e0d8b5b6..e0c3cad0fd8d 100644
    --- a/tools/perf/util/header.c
    +++ b/tools/perf/util/header.c
    @@ -2318,7 +2318,12 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
    if (ret == -1)
    return -1;

    - fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
    + fprintf(fp, "# captured on : %s", ctime(&st.st_ctime));
    +
    + fprintf(fp, "# header version : %u\n", header->version);
    + fprintf(fp, "# data offset : %" PRIu64 "\n", header->data_offset);
    + fprintf(fp, "# data size : %" PRIu64 "\n", header->data_size);
    + fprintf(fp, "# feat offset : %" PRIu64 "\n", header->feat_offset);

    perf_header__process_sections(header, fd, &hd,
    perf_file_section__fprintf_info);
    --
    2.13.6
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