Andreas Kling 9e9924115f Kernel: Release some clean file-backed memory when starved for pages ...

Until now, our only backup plan when running out of physical pages
was to try and purge volatile memory. If that didn't work out, we just
hung userspace out to dry with an ENOMEM.

This patch improves the situation by also considering clean, file-backed
pages (that we could page back in from disk).

This could be better in many ways, but it already allows us to boot to
WindowServer with 256 MiB of RAM. :^)

2022-08-14 23:33:28 +02:00

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