A long preemptive in-habitation in ordinal Linux degrades real-time response time. An interrupt latency is allowed to be between several tens of m secs in PCs and servers. On the other hands, in mobile phones, an interrupt latency is required to be between several p secs and several hundreds of p secs.
Solution candidate: An external interrupt arrives at CPU and the corresponding device drivers and process preemption occurs.
Until the process preemption, the following steps are required