On 2022-05-30 16:15:02 [-0700], Davidlohr Bueso wrote: > and thus are more important than all tasks on the system. Furthermore > there are no guarantees it will run in irq context at all if ksoftirq > kicks in. They never run in IRQ context, they always run in softirq context. Even if ksoftirqd kicks in, the callbacks (tasklets) are invoked in softirq context. That is sort of preemptible but in tasklet's case it will run/ complete all callbacks before any kind of preemption can kick in. So there is the lack of preemption for many/ long running callbacks and the callbacks have no context/ owner which means there is no way of preferring one over the other. Sebastian
