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    Subject[PATCH V2 3/6] perf: Support branch events
    Date
    From: Kan Liang <kan.liang@linux.intel.com>

    With the cycle time information between branches, stalls can be easily
    observed. But it's difficult to explain what causes the long delay.

    Add a new branch sample type to indicate whether include occurrences of
    events in branch info. The information will be stored in the branch
    stack extension space.

    Reviewed-by: Andi Kleen <ak@linux.intel.com>
    Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
    ---

    Changes since V1:
    - Rename to PERF_SAMPLE_BRANCH_EVT_CNTRS
    - Drop the event ID sample type

    include/linux/perf_event.h | 4 ++++
    include/uapi/linux/perf_event.h | 4 ++++
    2 files changed, 8 insertions(+)

    diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
    index e2e04dc39199..823c6779a96d 100644
    --- a/include/linux/perf_event.h
    +++ b/include/linux/perf_event.h
    @@ -1137,6 +1137,10 @@ static inline bool branch_sample_priv(const struct perf_event *event)
    return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_PRIV_SAVE;
    }

    +static inline bool branch_sample_evt_cntrs(const struct perf_event *event)
    +{
    + return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_EVT_CNTRS;
    +}

    struct perf_sample_data {
    /*
    diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
    index 1b3b90965b6b..3911cf000e8a 100644
    --- a/include/uapi/linux/perf_event.h
    +++ b/include/uapi/linux/perf_event.h
    @@ -204,6 +204,8 @@ enum perf_branch_sample_type_shift {

    PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT = 18, /* save privilege mode */

    + PERF_SAMPLE_BRANCH_EVT_CNTRS_SHIFT = 19, /* save occurrences of events on a branch */
    +
    PERF_SAMPLE_BRANCH_MAX_SHIFT /* non-ABI */
    };

    @@ -235,6 +237,8 @@ enum perf_branch_sample_type {

    PERF_SAMPLE_BRANCH_PRIV_SAVE = 1U << PERF_SAMPLE_BRANCH_PRIV_SAVE_SHIFT,

    + PERF_SAMPLE_BRANCH_EVT_CNTRS = 1U << PERF_SAMPLE_BRANCH_EVT_CNTRS_SHIFT,
    +
    PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT,
    };

    --
    2.35.1
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