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    Subject[PATCH v2 3/5] trace_event: record task' real_timer in itimer_state tracepoint
    When itimer is ITIMER_REAL, we should cooperate with hrtimer's
    tracepoit to get it's latency, this patch can let us get itimer's
    hrtimer easy

    Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
    ---
    include/trace/events/timer.h | 8 ++++++--
    1 files changed, 6 insertions(+), 2 deletions(-)

    diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
    index 9496b96..13ec15a 100644
    --- a/include/trace/events/timer.h
    +++ b/include/trace/events/timer.h
    @@ -285,6 +285,7 @@ TRACE_EVENT(itimer_state,

    TP_STRUCT__entry(
    __field( int, which )
    + __field( void *, timer )
    __field( cputime_t, expires )
    __field( long, value_sec )
    __field( long, value_usec )
    @@ -294,6 +295,8 @@ TRACE_EVENT(itimer_state,

    TP_fast_assign(
    __entry->which = which;
    + __entry->timer = which == ITIMER_REAL ?
    + &current->signal->real_timer : NULL;
    __entry->expires = expires;
    __entry->value_sec = value->it_value.tv_sec;
    __entry->value_usec = value->it_value.tv_usec;
    @@ -301,8 +304,9 @@ TRACE_EVENT(itimer_state,
    __entry->interval_usec = value->it_interval.tv_usec;
    ),

    - TP_printk("which=%d expires=%llu it_value=%ld.%ld it_interval=%ld.%ld",
    - __entry->which, (unsigned long long)__entry->expires,
    + TP_printk("which=%d timer=%p expires=%llu it_value=%ld.%ld it_interval="
    + "%ld.%ld", __entry->which, __entry->timer,
    + (unsigned long long)__entry->expires,
    __entry->value_sec, __entry->value_usec,
    __entry->interval_sec, __entry->interval_usec)
    );
    --
    1.6.1.2



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