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    SubjectRe: [PATCH 06/16] sched: SCHED_DEADLINE push and pull logic
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    On Fri, 2012-04-06 at 09:14 +0200, Juri Lelli wrote:
    >
    > static void set_cpus_allowed_dl(struct task_struct *p,
    > @@ -622,10 +1346,145 @@ static void set_cpus_allowed_dl(struct task_struct *p,
    >
    > BUG_ON(!dl_task(p));
    >
    > + /*
    > + * Update only if the task is actually running (i.e.,
    > + * it is on the rq AND it is not throttled).
    > + */
    > + if (on_dl_rq(&p->dl) && (weight != p->dl.nr_cpus_allowed)) {
    > + struct rq *rq = task_rq(p);
    > +
    > + if (!task_current(rq, p)) {
    > + /*
    > + * If the task was on the pushable list,
    > + * make sure it stays there only if the new
    > + * mask allows that.
    > + */
    > + if (p->dl.nr_cpus_allowed > 1)
    > + dequeue_pushable_dl_task(rq, p);
    > +
    > + if (weight > 1)
    > + enqueue_pushable_dl_task(rq, p);
    > + }
    > +
    > + if ((p->dl.nr_cpus_allowed <= 1) && (weight > 1)) {
    > + rq->dl.dl_nr_migratory++;
    > + } else if ((p->dl.nr_cpus_allowed > 1) && (weight <= 1)) {
    > + BUG_ON(!rq->dl.dl_nr_migratory);
    > + rq->dl.dl_nr_migratory--;
    > + }
    > +
    > + update_dl_migration(&rq->dl);

    Note, I'm in the process of testing this patch:

    https://lkml.org/lkml/2012/4/11/7

    Just giving you a heads up, as this looks like you can benefit from this
    change as well.

    -- Steve


    > + }
    > +
    > cpumask_copy(&p->cpus_allowed, new_mask);
    > p->dl.nr_cpus_allowed = weight;
    > }
    > +




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