PREEMPT_RT over the years

Real time Linux with PREEMPT_RT started 20 years ago. Over the years the project contributed bits from  its out of tree patch to the common code base. Today almost all required parts of the PREEMPT_RT are part of the common Linux code base. Lets look some of some of the code parts that were merged, how PREEMPT_RT is used and what are the current challenges that need to be solved and why.

Sebastian ANDRZEJ