The RT patch -What needs to be done to get it into mainline?
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One Line Summary
This talk will explain what still needs to be done to get the RT patch fully into mainline, and what is holding it up from getting in.
The Real Time patch (RT patch or PREEMPT_RT), has been maintained out of the Linux kernel tree since late 2004. It is the longest and largest patch set to be kept out of the tree and still widely used. A lot of the patch has made it into mainline (mutex code, priority inheritance futexes, ftrace, lockdep, hrtimers, generic interrupts, threaded irqs, Real Time scheduler, etc). The RT patch had so much influence on mainline, that new code for Real Time can now be directly added to mainline (for example: NO_HZ_FULL and the DEADLINE scheduler), but there is still a lot more that needs to go into mainline to make it a true RTOS. This talk will explain what those features are and what is holding it up from getting in. Some of it is technical and some of it is political. Both of these types of issues will be discussed.
Steven Rostedt has been working with the Linux kernel since 2001. He currently works for Red Hat working in their Messaging Real-time Grid (MRG) division. He created and maintains Ftrace, the official Linux kernel tracer, and is the current real-time kernel stable maintainer.