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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This archive was generated by hypermail 2b29 : Sat Aug 31 2002 - 22:00:27 EST