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    Subject[PATCH 11/37] perf header: Display missing features
    Date
    From: Jiri Olsa <jolsa@kernel.org>

    Display missing features in header info, like:

    $ perf report --header-only
    # ========
    # captured on: Mon Oct 10 09:39:47 2016
    ...
    # missing features: HEADER_TRACING_DATA HEADER_CPU_TOPOLOGY ...

    To help in diagnosing problems.

    Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: http://lkml.kernel.org/n/tip-bh5gp84gobdmyl345dcp64se@git.kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/util/header.c | 10 +++++++++-
    1 file changed, 9 insertions(+), 1 deletion(-)

    diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
    index 05f562760958..d6310c6dace5 100644
    --- a/tools/perf/util/header.c
    +++ b/tools/perf/util/header.c
    @@ -2251,7 +2251,7 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
    struct perf_header *header = &session->header;
    int fd = perf_data_file__fd(session->file);
    struct stat st;
    - int ret;
    + int ret, bit;

    hd.fp = fp;
    hd.full = full;
    @@ -2264,6 +2264,14 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)

    perf_header__process_sections(header, fd, &hd,
    perf_file_section__fprintf_info);
    +
    + fprintf(fp, "# missing features: ");
    + for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {
    + if (bit)
    + fprintf(fp, "%s ", feat_ops[bit].name);
    + }
    +
    + fprintf(fp, "\n");
    return 0;
    }

    --
    2.7.4
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