On 08/02, Oleg Nesterov wrote:
>
> And I don't understand why rt_mutex_setprio() is called just before
> calling work->func(). This means that a high-priority work could
> be delayed by the low-priority ->current_work.
Aha, I missed the rt_mutex_setprio() in insert_work().
This is not good either. Suppose we have
void work_handler(struct work_struct *self)
{
if (!try_lock()) {
// try again later...
queue_work(wq, self);
return;
}
do_the_work();
}
What if that work was queued by the low-priority thread, and
then a high-priority thread inserts a new work when work_handler()
is running?
Oleg.
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