presenting unfork(2), the most cursed piece of code i ever wrotehttps://github.com/whitequark/unfork#introduction …
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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.
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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*googles Kernel Samepage Merging*. Yes! Same idea, but apparently a completely independent implementation. The thing I am thinking about was written in maybe 1999 and it was a very small kernel patch with a userspace daemon that would find same pages.
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