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    Subject[PATCH V2 11/13] perf tools: introduce PERF_RECORD_USER_OVERHEAD
    Date
    From: Kan Liang <kan.liang@intel.com>

    It is used to track user space perf tool profiling time cost.

    Signed-off-by: Kan Liang <kan.liang@intel.com>
    ---
    tools/perf/util/event.c | 1 +
    tools/perf/util/event.h | 5 +++++
    tools/perf/util/session.c | 4 ++++
    3 files changed, 10 insertions(+)

    diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
    index e8736dc..764893c 100644
    --- a/tools/perf/util/event.c
    +++ b/tools/perf/util/event.c
    @@ -48,6 +48,7 @@ static const char *perf_event__names[] = {
    [PERF_RECORD_STAT_ROUND] = "STAT_ROUND",
    [PERF_RECORD_EVENT_UPDATE] = "EVENT_UPDATE",
    [PERF_RECORD_TIME_CONV] = "TIME_CONV",
    + [PERF_RECORD_USER_OVERHEAD] = "USER_OVERHEAD",
    };

    const char *perf_event__name(unsigned int id)
    diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
    index a6c98ce..6110f32 100644
    --- a/tools/perf/util/event.h
    +++ b/tools/perf/util/event.h
    @@ -237,6 +237,7 @@ enum perf_user_event_type { /* above any possible kernel type */
    PERF_RECORD_STAT_ROUND = 77,
    PERF_RECORD_EVENT_UPDATE = 78,
    PERF_RECORD_TIME_CONV = 79,
    + PERF_RECORD_USER_OVERHEAD = 80,
    PERF_RECORD_HEADER_MAX
    };

    @@ -490,6 +491,10 @@ struct time_conv_event {
    u64 time_zero;
    };

    +enum perf_user_overhead_event_type { /* above any possible kernel type */
    + PERF_USER_OVERHEAD_TYPE_START = 100,
    +};
    +
    struct perf_overhead {
    struct perf_event_header header;
    u64 type;
    diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
    index 1dc32e3..7745bec 100644
    --- a/tools/perf/util/session.c
    +++ b/tools/perf/util/session.c
    @@ -804,6 +804,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
    [PERF_RECORD_STAT_ROUND] = perf_event__stat_round_swap,
    [PERF_RECORD_EVENT_UPDATE] = perf_event__event_update_swap,
    [PERF_RECORD_TIME_CONV] = perf_event__all64_swap,
    + [PERF_RECORD_USER_OVERHEAD] = perf_event__all64_swap,
    [PERF_RECORD_HEADER_MAX] = NULL,
    };

    @@ -1387,6 +1388,9 @@ static s64 perf_session__process_user_event(struct perf_session *session,
    case PERF_RECORD_TIME_CONV:
    session->time_conv = event->time_conv;
    return tool->time_conv(tool, event, session);
    + case PERF_RECORD_USER_OVERHEAD:
    + overhead_stats_update(tool, session->evlist, event, -1);
    + return tool->overhead(tool, event, NULL, NULL);
    default:
    return -EINVAL;
    }
    --
    2.5.5
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