On Thu, Nov 7, 2013 at 5:43 AM, Juri Lelli <juri.le...@gmail.com> wrote:
> From: Dario Faggioli <raist...@linux.it>
>
> Add a new function to the scheduling class interface. It is called
> at the end of a context switch, if the prev task is in TASK_DEAD state.
>
> It might be useful for the scheduling classes that want to be notified
> when one of their task dies, e.g. to perform some cleanup actions.
We could also usefully use this within SCHED_FAIR to remove a task's
load contribution when it completes.
>
> Signed-off-by: Dario Faggioli <raist...@linux.it>
> Signed-off-by: Juri Lelli <juri.le...@gmail.com>
> ---
> kernel/sched/core.c | 3 +++
> kernel/sched/sched.h | 1 +
> 2 files changed, 4 insertions(+)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 5ac63c9..850a02c 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1890,6 +1890,9 @@ static void finish_task_switch(struct rq *rq, struct
> task_struct *prev)
> if (mm)
> mmdrop(mm);
> if (unlikely(prev_state == TASK_DEAD)) {
> + if (prev->sched_class->task_dead)
> + prev->sched_class->task_dead(prev);
> +
> /*
> * Remove function-return probe instances associated with this
> * task and put them back on the free list.
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index b3c5653..64eda5c 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -992,6 +992,7 @@ struct sched_class {
> void (*set_curr_task) (struct rq *rq);
> void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
> void (*task_fork) (struct task_struct *p);
> + void (*task_dead) (struct task_struct *p);
>
> void (*switched_from) (struct rq *this_rq, struct task_struct *task);
> void (*switched_to) (struct rq *this_rq, struct task_struct *task);
Reviewed-by: Paul Turner <p...@google.com>
> --
> 1.7.9.5
>
> --
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