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    Subject[PATCH] perf report: delay sample_type checks in pipe mode
    Date
    The pipeline:
    perf record -a -g -o - sleep 5 |perf inject -v -b | perf report -g -i -

    generates the warning:
    Selected -g but no callchain data. Did you call 'perf record' without -g?

    The problem is that the header data is not written to the pipe, so the
    sample_type has not been available when perf_report__setup_sample_type is
    called. For pipe mode, record dumps the sample type as part of the
    synthesized events stream -- perf_event__synthesize_attrs(). Handle this
    be detecting pipe mode and not doing early sanity checks on sample_type.

    Signed-off-by: David Ahern <dsahern@gmail.com>
    ---
    tools/perf/builtin-report.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
    index ebcb3e2..9b3e9e9 100644
    --- a/tools/perf/builtin-report.c
    +++ b/tools/perf/builtin-report.c
    @@ -246,11 +246,12 @@ static int process_read_event(struct perf_tool *tool,
    return 0;
    }

    +/* For pipe mode, sample_type is not currently set */
    static int perf_report__setup_sample_type(struct perf_report *rep)
    {
    struct perf_session *self = rep->session;

    - if (!(self->sample_type & PERF_SAMPLE_CALLCHAIN)) {
    + if (!self->fd_pipe && !(self->sample_type & PERF_SAMPLE_CALLCHAIN)) {
    if (sort__has_parent) {
    ui__error("Selected --sort parent, but no "
    "callchain data. Did you call "
    @@ -273,7 +274,8 @@ static int perf_report__setup_sample_type(struct perf_report *rep)
    }

    if (sort__branch_mode == 1) {
    - if (!(self->sample_type & PERF_SAMPLE_BRANCH_STACK)) {
    + if (!self->fd_pipe &&
    + !(self->sample_type & PERF_SAMPLE_BRANCH_STACK)) {
    ui__error("Selected -b but no branch data. "
    "Did you call perf record without -b?\n");
    return -1;
    --
    1.7.10.1


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