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30 Lines of Code Could Cut Data Center Power Use by 30%
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This is the actual change if you're curious: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=80b6f094756f
And the paper: https://dl.acm.org/doi/abs/10.1145/3626780
That's way more than 30 lines or code and also their "We didn’t add anything." claim seems to be nonsense.
Most of what you're looking at there is tests and comments, the actual additional code is minimal (I'm not gonna try and count the lines on my phone)