[Verse 1] In the heart of every system where timing matters most Real-time kernels dance with precision, that's their boast But how do we measure when interrupts arrive Check the latency numbers to keep performance alive From hardware signal to handler execution start Every microsecond counts, it's a timing art [Chorus] Measure, analyze, optimize the flow Interrupt latency, context switch, let the metrics show Scheduling behavior under pressure and load Real-time performance, crack the timing code Measure, analyze, the kernel's heartbeat strong Keep those deadlines met where they belong [Verse 2] Context switching overhead steals precious time away Save the registers, switch the memory, process state at play Cache misses and TLB flushes add delay to every turn Profile the transition cost, that's how systems learn Thread to thread, core to core, the switching dance goes on Minimize the overhead till the bottlenecks are gone [Chorus] Measure, analyze, optimize the flow Interrupt latency, context switch, let the metrics show Scheduling behavior under pressure and load Real-time performance, crack the timing code Measure, analyze, the kernel's heartbeat strong Keep those deadlines met where they belong [Bridge] Priority inversion haunts the scheduler's dream Deadline monotonic, rate monotonic schemes Cyclictest reveals the jitter in the night Ftrace and perf tools bring the data to light When hard real-time meets the silicon race Every nanosecond finds its rightful place [Verse 3] Preemption points scattered through the kernel code RT patches make the system more real-time mode Scheduling latency from wakeup to run Measure the histogram till optimization's done Lock contention blocks the critical path flow Spinlocks versus mutexes, which way should we go [Chorus] Measure, analyze, optimize the flow Interrupt latency, context switch, let the metrics show Scheduling behavior under pressure and load Real-time performance, crack the timing code Measure, analyze, the kernel's heartbeat strong Keep those deadlines met where they belong [Outro] In the world of real-time where precision is key Performance analysis sets your system free From interrupt to schedule, measure every beat Make your kernel sing in real-time sweet
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