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    Subject[RFC][PATCH 01/22] sched: add sched_class->task_dead.

    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.

    Signed-off-by: Dario Faggioli <>
    include/linux/sched.h | 1 +
    kernel/sched.c | 3 +++
    2 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/include/linux/sched.h b/include/linux/sched.h
    index b3d07df..6053b4b 100644
    --- a/include/linux/sched.h
    +++ b/include/linux/sched.h
    @@ -1068,6 +1068,7 @@ 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,
    int running);
    diff --git a/kernel/sched.c b/kernel/sched.c
    index 41f1869..07f5a0c 100644
    --- a/kernel/sched.c
    +++ b/kernel/sched.c
    @@ -2891,6 +2891,9 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
    if (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.

    <<This happens because I choose it to happen!>> (Raistlin Majere)
    Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa (Italy) / /
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