presenting unfork(2), the most cursed piece of code i ever wrotehttps://github.com/whitequark/unfork#introduction …
Wow. This reminds me: There used to be a project that would find identical pages in memory and make them one page with cow. Useful when you have tons of long-running processes that all share the same startup sequence.
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That was a thesis at TU Vienna, no idea if it ever made it "into the wild". It used to make it possible that a class of 20 students could run the same crappy non-foss Fortran compiler on the the Alpha machine that was the only hardware they had that could run this compiler.
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Kernel Samepage Merging?
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reminds me to a kernel with userfaultfd, arch doesn't have it by default
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I worked on a PoC to do this with the Slack Mac app from userspace (root). IIRC at least 25% of the pages were mergeable.
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