Real Time is Coming to Linux; What Does that Mean to You?
summary
Linux gains preempt_rt in mainline as a kernel config option that makes interrupts into schedulable threads (use of force_threaded_irq), converts sleeping spinlocks into mutex-like locks with kernel-wide priority inheritance, and forces driver and softirq fixes to avoid blocking high-priority tasks. Expect many small patches to vanish once the big sleeping-spinlock change lands; testing and regression catching (softirq prioritization, reader/writer lock avoidance, per-CPU use) is ongoing and determinism ultimately depends on hardware latency.
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chapters (11)
- 0:00Start
- 2:12Review
- 5:51Enabling PREEMPT RT
- 11:14Interrupts
- 15:28Priority Inheritance
- 16:02Priority Inversion
- 23:23Real Spinning Locks
- 24:02Sleeping Spin Locks
- 25:34Per CPU variables?
- 29:49Disabling interupts
- 46:00raw spin locks
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