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Investigating performance issues | Josef Bacik’s Blog
https://josefbacik.github.io/kernel/btrfs/tracing/2020/09/25/timing-investigations.html
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tl;dr Learn how to use BPF/BCC/bpftrace, they will make your life so much easier. I dump all of my scripts I write here, they are mostly very raw, but good starting points for “how the hell do I do X”.
