Linux itself has a very big advantage is stability, kernel lean, implementation needs less resources. There is no essential difference between embedded Linux and normal Linux.
One drawback of implementing Linux on embedded systems is that its core architecture has not been designed yet again, but is streamlined from desktop Linux, albeit with a preemptive multitasking capability, which sometimes behaves poorly in real time.
So, in order to provide real-time performance. Embedded Linux requires the addition of real-time software modules.
The kernel space implemented by these modules is the operating system implementation scheduling strategy. Hardware interrupt exceptions and parts of the execution program. Because these real-time software modules are executed in kernel space, code errors can disrupt the operating system and thus affect the reliability of the entire system, which can be a serious flea power for real-time applications.
Linux controls for embedded Linux and PCs