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Learn about the latest developments in PREEMPT_RT from Sebastian Siewior in this 38-minute conference talk from the Linux Plumbers Conference. Discover how PREEMPT_RT has evolved since its mainline merge, including the introduction of local bottom halves that enable lock removal in various scenarios. Explore improvements to the futex code that allow for process private hashing and enhanced hash handling across NUMA nodes. Understand the rationale behind these changes, their technical implementation, and why the patch queue and development tree continue to exist despite the mainline integration. Gain insights into the ongoing optimization efforts for real-time Linux kernel performance and the specific challenges addressed by these recent enhancements.
