BPF Theremin, Tetris, and Typewriters
Brendan Gregg
DECEMBER 22, 2019
For my AWS re:Invent talk on BPF Performance Analysis at Netflix, I began with a demo of "BPF superpowers" (aka eBPF). The video is on [youtube] and the demo starts at [0:50] (the sildes are on [slideshare]): I'm demonstrating a tool I developed to turn my laptop's wifi signal strength into audio. I first developed it as this [bpftrace] one-liner: bpftrace -e 'k:__iwl_dbg /str(arg4) == "Rssi %d, TSF %llun"/ { printf("strength: %dn", arg5); }'.
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