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SubjectRe: [PATCH] low-latency zap_page_range()
On Thu, 29 Aug 2002, Andrew Morton wrote:

> > 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

It might be fixable in some dirty way, but I doubt that'll
ever be worth it.


Bravely reimplemented by the knights who say "NIH".

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