Nope. The swap-in read-ahead still works - the _only_ thing the semaphore
does is serialize different processes accessing the same area, and that's
as likely to improve performace as to degrade it (potentially less
seeking).
> Btw, I'm sure that for multi-threaded applications, the mmap performance
> of Linux will be poor because everything is single-threaded. I'll
> write a benchmark and compare it with WinNT/Win95.
I will bet you 5 bucks we'll kick ass.
Linus
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