"There are also several Linux-specific issues that should be
considered when migrating. The current real-time operating system
tasks are grouped as Linux threads under a Linux process, so the
separation in user space and kernel space has to be taken into
"Depending on the required response time of the application and
the CPU performance, the Linux kernel may be able to satisfy these
without modification (with a response time of tens of milliseconds)
or may require additional functionality such as the PREEMPT_RT
kernel patches (with a response time of tens of microseconds)."
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