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SubjectRe: What to do when out of memory
> It seems it is possible to keep track of memory such that any successful
> mmap will always be pageable - keep track of allocated pages which are
> pending paging and subtract that from free_pages in vm_enough_memory().
> Still, this is getting back to a short thread I started long ago - if I
> have some spare time I'll try implementing it.

I actually implemented it for 1.2.x by simply counting vma sizes in
mm/*.c. You end up needing a lot of swap 'just in case'. If you want to be
completely correct you need to account all R/O shared pages as potentially
private because of ptrace().

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