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SubjectRe: 3rd version of R/W mmap_sem patch available
> Besides, the fair semaphores would potentially slow things down, while
> this potentially speeds things up. So.. It looks obvious enough.

Rik, did you check that {pte,pmd}_alloc are thread safe? At least in
2.4.2 they aren't (include/asm-i386/pgalloc.h), and your patch doesn't
touch pgalloc.

{pte,pmd}_alloc are called from handle_mm_fault, and that function is
now running with down_read().


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