[Verse 1] Deep beneath the user space, where microseconds matter most Kernels dance with precision timing, interrupts become our host When a signal breaks the silence, how fast can we respond? Latency becomes the measure of our real-time bond [Chorus] Measure twice, optimize once, every nanosecond counts Interrupt response time, context switching amounts Schedule tight, preempt right, keep the jitter low Real-time kernels demand perfection in the timing flow [Verse 2] Context switches steal our cycles, saving state and loading new Register dumps and memory maps, the overhead we must pursue Cache misses haunt our pipeline, TLB flushes cost us dear Quantify each transition cost, make the bottlenecks clear [Chorus] Measure twice, optimize once, every nanosecond counts Interrupt response time, context switching amounts Schedule tight, preempt right, keep the jitter low Real-time kernels demand perfection in the timing flow [Bridge] Priority inversions lurk, deadlines start to slip away Cyclictest reveals the truth, ftrace shows us where delays Perf and kernelshark expose the criminals that steal our time Histogram distributions paint the picture, millisecond crime [Verse 3] PREEMPT_RT patches transform, vanilla kernels gain new speed Spinlocks become sleeping mutexes, priority inheritance we need IRQ threading isolates the chaos, CPU affinity holds the line Deterministic execution paths, predictable by design [Chorus] Measure twice, optimize once, every nanosecond counts Interrupt response time, context switching amounts Schedule tight, preempt right, keep the jitter low Real-time kernels demand perfection in the timing flow [Outro] When the deadline meets the schedule And the latency stays small Real-time engineering triumphs Microsecond masters of it all
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