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SubjectRe: [PATCH] low-latency zap_page_range()
Robert Love wrote:
> On Thu, 2002-08-29 at 17:00, Andrew Morton wrote:
> > That's an interesting point. page_table_lock is one of those locks
> > which is occasionally held for ages, and frequently held for a short
> > time.
> Since latency is a direct function of lock held times in the preemptible
> kernel, and I am seeing disgusting zap_page_range() latencies, the lock
> is held a long time.
> 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 :(
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