Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks()

[Lai Jiangshan]

On 08/01/2014 05:55 AM, Paul E. McKenney wrote:
> +		rcu_read_lock();
> +		for_each_process_thread(g, t) {
> +			if (t != current && ACCESS_ONCE(t->on_rq) &&
> +			    !is_idle_task(t)) {
> +				get_task_struct(t);
> +				t->rcu_tasks_nvcsw = ACCESS_ONCE(t->nvcsw);
> +				ACCESS_ONCE(t->rcu_tasks_holdout) = 1;
> +				list_add(&t->rcu_tasks_holdout_list,
> +					 &rcu_tasks_holdouts);

This loop will collect all the runnable tasks.  It is too much tasks.
Is it possible to collect only on_cpu tasks or PREEMPT_ACTIVE tasks?
It seems hard to achieve it.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/