On 05/10/2020 16:57, Peter Zijlstra wrote:
[...]
> --- a/kernel/sched/rt.c
> +++ b/kernel/sched/rt.c
> @@ -1859,7 +1859,7 @@ static struct task_struct *pick_next_pus
> * running task can migrate over to a CPU that is running a task
> * of lesser priority.
> */
> -static int push_rt_task(struct rq *rq)
> +static int push_rt_task(struct rq *rq, bool pull)
> {
> struct task_struct *next_task;
> struct rq *lowest_rq;
> @@ -1873,6 +1873,34 @@ static int push_rt_task(struct rq *rq)
> return 0;
>
> retry:
> + if (is_migration_disabled(next_task)) {
> + struct task_struct *push_task = NULL;
> + int cpu;
> +
> + if (!pull || rq->push_busy)
> + return 0;
Shouldn't there be the same functionality in push_dl_task(), i.e.
returning 0 earlier for a task with migration_disabled?
[...]
