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    SubjectRe: [RFC/PATCH 0/3] sched: hrtick and rt group scheduling

    * Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

    > I spend xmas implementing group scheduling for the realtime scheduling
    > classes. Its a tad raw, but seems to work for the trivial test cases I
    > threw at it.
    >
    > The hrtick stuff is unrelated but was still stuck in my sched queue.

    thanks Peter, this is really cool stuff! I have picked up all 3 patches
    into sched-devel.git - let's see how they work out.

    (btw., i had to do the fixes below. Are you sure you sent the right
    version of the patches?)

    Ingo

    Index: linux/kernel/sched_rt.c
    ===================================================================
    --- linux.orig/kernel/sched_rt.c
    +++ linux/kernel/sched_rt.c
    @@ -337,7 +337,6 @@ static void dequeue_rt_entity(struct sch
    {
    struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
    struct rt_prio_array *array = &rt_rq->active;
    - struct rt_rq *group_rq = group_rt_rq(rt_se);

    list_del_init(&rt_se->run_list);
    if (list_empty(array->queue + rt_se_prio(rt_se)))
    @@ -527,10 +526,8 @@ static struct task_struct *pick_next_tas

    do {
    rt_se = pick_next_rt_entity(rq, rt_rq);
    - if (unlikely(!rt_se)) {
    - foo = 1;
    + if (unlikely(!rt_se))
    goto retry;
    - }
    rt_rq = group_rt_rq(rt_se);
    } while (rt_rq);


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