[Verse 1] When microseconds matter and timing's everything Real-time kernels dancing to a precise-measured ring Interrupt latency counting every tick that we wait From signal raised to handler running, can't be too late Measure from the hardware trigger to the first line of code Jitter in the timing means our system might explode [Chorus] Measure, analyze, optimize the flow Interrupt, context, schedule what we know Latency and overhead, keep them running low Real-time performance is the way to go Trace the paths and time each switch Find the bottlenecks, scratch that itch [Verse 2] Context switching overhead when processes must change Save the registers and memory, rearrange the range Stack pointer, program counter, all the CPU state Store it fast and load the next before it gets too late TLB flushes cost us dearly, cache misses hurt the most Every nanosecond matters from coast to coast [Chorus] Measure, analyze, optimize the flow Interrupt, context, schedule what we know Latency and overhead, keep them running low Real-time performance is the way to go Trace the paths and time each switch Find the bottlenecks, scratch that itch [Bridge] Priority inversion when the high gets blocked by low Scheduler algorithms determining where tasks should go Round robin, earliest deadline, rate monotonic too Fixed priority preemptive scheduling coming through Cyclictest and perf tools measuring what we need Histograms showing distribution at lightning speed [Verse 3] Kernel preemption points where higher tasks break in Disable interrupts carefully, let the real-time win Memory allocation bounded, no surprise delays Lock-free data structures for the fastest ways RTOS characteristics with deterministic time Every deadline guaranteed, performance so sublime [Chorus] Measure, analyze, optimize the flow Interrupt, context, schedule what we know Latency and overhead, keep them running low Real-time performance is the way to go Trace the paths and time each switch Find the bottlenecks, scratch that itch [Outro] When every microsecond counts and timing must be true Real-time kernel analysis will see your system through Measure twice, optimize once, keep latencies tight Performance engineering done right
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