Linux real-time applications

Having a real-time operating system may not always be enough for everyone. Some people would also require real-time optimized applications running over the operating system. To make sure an rt-application can be designed and interacted with, the required determinism is necessary on the operating system and hardware. With regard to the hardware configuration, the requirements involve a low-latency interrupt handling. The mechanisms causing the ISR latencies should register values around tens of microseconds.

Regarding the kernel configuration required by real-time applications, the following configurations are necessary:

• On-demand CPU scaling: Using this configuration helps with the creation of long-latency events when the CPU is in a low-power consumption mode.

• NOHZ: This configurations disables the timer interrupt received by CPUs. With this option enabled, the latency spent on a CPU wake up is diminished.

To write an application, there are some things that need...