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    Subject[PATCH 7/7] event: add tracepoint for accounting block time
    Date
    This tracepoint shows how long a task is sleeping in uninterruptible state.

    E.g.
    It may show how long and where a mutex is waited.

    Signed-off-by: Andrew Vagin <avagin@openvz.org>
    ---
    include/trace/events/sched.h | 7 +++++++
    kernel/sched_fair.c | 2 ++
    2 files changed, 9 insertions(+), 0 deletions(-)

    diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
    index 959ff18..be077cf 100644
    --- a/include/trace/events/sched.h
    +++ b/include/trace/events/sched.h
    @@ -331,6 +331,13 @@ DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
    TP_ARGS(tsk, delay));

    /*
    + * Tracepoint for accounting block time (time the task is in uninterruptible).
    + */
    +DEFINE_EVENT(sched_stat_template, sched_stat_block,
    + TP_PROTO(struct task_struct *tsk, u64 delay),
    + TP_ARGS(tsk, delay));
    +
    +/*
    * Tracepoint for accounting runtime (time the task is executing
    * on a CPU).
    */
    diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
    index 5c9e679..0d7b156 100644
    --- a/kernel/sched_fair.c
    +++ b/kernel/sched_fair.c
    @@ -907,6 +907,8 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
    trace_sched_stat_iowait(tsk, delta);
    }

    + trace_sched_stat_block(tsk, delta);
    +
    /*
    * Blocking time is in units of nanosecs, so shift by
    * 20 to get a milliseconds-range estimation of the
    --
    1.7.1


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