> > So we know it is held forever and a day... but is there contention?
>
> I'm sure there is, but nobody has measured the right workload.
>
> Two CLONE_MM threads, one running mmap()/munmap(), the other trying
> to fault in some pages. I'm sure someone has some vital application
> which does exactly this. They always do :(
Can't fix this one. The mmap()/munmap() needs to have the
mmap_sem for writing as long as its setting up or tearing
down a VMA while the pagefault path takes the mmap_sem for
reading.
It might be fixable in some dirty way, but I doubt that'll
ever be worth it.
regards,
Rik
-- Bravely reimplemented by the knights who say "NIH".http://www.surriel.com/ http://distro.conectiva.com/
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