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SubjectRe: [PATCH] sched: Distinguish sched_wakeup event when wake up a task which did schedule out or not.
Hi steven, does this version look good to you?

Thanx :)

On 05/06/2014 10:52 AM, Dongsheng Yang wrote:
> ttwu_do_wakeup() is called when the task's state is switched back to
> TASK_RUNNING, whether or not the task actually scheduled out. Tracing
> the wakeup event when the task never scheduled out is quite confusing.
>
> This patch take the use of 'success' parameter in sched_wakeup tracepoint,
> to indicate that the task we are waking up did schedule out or just
> change its state to TASK_RUNNING.
>
> success is true:
> task was out of run queue and sleeping, we are really wake it up.
> success is false:
> taks was on run queue all the time and we just change its state
> to TASK_RUNNING.
>
> Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
> ---
> kernel/sched/core.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 9074c6d..14b9fe4 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1420,6 +1420,7 @@ static void ttwu_activate(struct rq *rq, struct task_struct *p, int en_flags)
> {
> activate_task(rq, p, en_flags);
> p->on_rq = 1;
> + trace_sched_wakeup(p, true);
>
> /* if a worker is waking up, notify workqueue */
> if (p->flags & PF_WQ_WORKER)
> @@ -1433,7 +1434,6 @@ static void
> ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags)
> {
> check_preempt_curr(rq, p, wake_flags);
> - trace_sched_wakeup(p, true);
>
> p->state = TASK_RUNNING;
> #ifdef CONFIG_SMP
> @@ -1481,6 +1481,7 @@ static int ttwu_remote(struct task_struct *p, int wake_flags)
> if (p->on_rq) {
> /* check_preempt_curr() may use rq clock */
> update_rq_clock(rq);
> + trace_sched_wakeup(p, false);
> ttwu_do_wakeup(rq, p, wake_flags);
> ret = 1;
> }
> @@ -1675,6 +1676,8 @@ static void try_to_wake_up_local(struct task_struct *p)
>
> if (!p->on_rq)
> ttwu_activate(rq, p, ENQUEUE_WAKEUP);
> + else
> + trace_sched_wakeup(p, false);
>
> ttwu_do_wakeup(rq, p, 0);
> ttwu_stat(p, smp_processor_id(), 0);



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