[Verse 1] When your kernel's running slow and you want to know why CPU cycles vanishing, performance way too high There's a tool that looks inside the hardware's beating heart Perf will show you where your system's bottlenecks start Sample after sample, it captures every call Memory patterns, branch predictions, perf sees it all [Chorus] Perf record, perf report, diving in the data flow Counting cache misses, branch predicting, watch your numbers grow Hardware counters tell the stories that you need to know Perf stat, perf top, let the profiling show Where your kernel bottlenecks are hiding down below [Verse 2] Start with perf stat to get your overview clear Instructions every cycle, cache behavior appears L1, L2, L3 misses lighting up your screen Branch mispredictions showing where your code gets lean TLB misses stalling memory translation Page faults showing allocation frustration [Chorus] Perf record, perf report, diving in the data flow Counting cache misses, branch predicting, watch your numbers grow Hardware counters tell the stories that you need to know Perf stat, perf top, let the profiling show Where your kernel bottlenecks are hiding down below [Bridge] Flame graphs burning bright with call stack pictures Hot spots glowing red need fixing their mixtures Kernel space and user space divided clean and neat PMU events paint the performance beat Sample frequency tuning signal from the noise Profile guided optimization, always the smart choice [Verse 3] Perf record with dash g captures call graph traces Function attribution shows you all the places Where your CPU time disappears into the air System calls and interrupts are waiting for you there Annotate assembly, see instruction cost Find the cycles where performance has been lost [Chorus] Perf record, perf report, diving in the data flow Counting cache misses, branch predicting, watch your numbers grow Hardware counters tell the stories that you need to know Perf stat, perf top, let the profiling show Where your kernel bottlenecks are hiding down below [Outro] From sampling to tracing, perf will show the way Hardware performance counters guide you every day Kernel space profiling with precision and with might Perf tools will give you true performance insight
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