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-bdfzdy1xv8ocs6ukk31sg...@git.kernel.org
Signed-off-by: Jiri Olsa <jo...@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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