What is the Linux page replacement policy?

[Martin Martin]

Specifically for the file system cache.

These pages claim it's a variant of 2Q, at least in 2.6:
https://www.kernel.org/doc/gorman/html/understand/understand013.html
http://linux-mm.org/PageReplacementDesign

It looks like there was some work on LIRS, CLOCK-Pro and CAR/CART.
Did those ever make it into the kernel?
http://linux-mm.org/AdvancedPageReplacement

There's also FlexiCache, that didn't make it into the standard
distribution, did it?
https://www.usenix.org/conference/fast-07/flexicache-flexible-interface-customizing-linux-file-system-buffer-cache

I'm interested in the default in kernels that are or will be in
widespread use, e.g. Ubuntu.

I'm not on the mailing list although I plan to check the archives, but
please reply to me directly as well as the list.

Thanks,
Martin
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