On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> +/*
> + * Ensure that the task has been requeued. The stopper ensures that the task
> cannot
> + * be migrated to a different CPU while its core scheduler queue state is
> being updated.
> + * It also makes sure to requeue a task if it was running actively on
> another CPU.
> + */
> +static int sched_core_task_join_stopper(void *data)
> +{
> + struct sched_core_task_write_tag *tag = (struct
> sched_core_task_write_tag *)data;
> + int i;
> +
> + for (i = 0; i < 2; i++)
> + sched_core_tag_requeue(tag->tasks[i], tag->cookies[i], false /*
> !group */);
> +
> + return 0;
> +}
> +
> +static int sched_core_share_tasks(struct task_struct *t1, struct task_struct
> *t2)
> +{
> + stop_machine(sched_core_task_join_stopper, (void *)&wr, NULL);
> +}
This is *REALLY* terrible...
