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> Most of the world manages to run their binaries on a mainline kernel

Most of the world doesn’t need to worry about their kernel - this is a good thing. But at FAANG scale, you inevitably need to make changes and optimizations.

Eg: “Twitter has a kernel team!?” - https://danluu.com/in-house/

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I thought the kernel was pretty stable. My first team at twitter I think we ran into 2 or 3 kernel bugs that year. I couldn't believe it but for some problems the blaming the kernel is a real debugging step (and even the bios lol). I think I had two perf problems turn into upstream patches thanks to the kernel team.

It's not only about bugs, but if you know your workload and your systems you can do some tricks a general purpose kernel can't do to tweak it for your needs and get a benefit here or there for your code.

that was a very interesting article; thanks for posting it :)

Np, I saw it on HN last week :)

Discussion: https://news.ycombinator.com/item?id=28691676

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