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SubjectRe: Deadlock on the mm->mmap_sem
> if we go generic then I strongly recommend my version of the generic
> semaphores is _much_ faster (and cleaner) than this one (it even
> more than 2^31 concurrent readers on 64 bit archs ;).

implementing recursive semaphores is trivial, but do you have any idea
how to fix the latency problem?
Multithreaded, iobound apps that use mmap are unusable with unfair

My test app hangs for minutes within mprotect().


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