Finding out who's holding a lock?

[Andy Lutomirski]

My program is occasionally seeing slow page faults.  latencytop says
they're slow because they're waiting for read access to mmap_sem, but
latencytop isn't showing any other thread in the process blocking.

Is there any straightforward way to find out who called down_write on
mmap_sem when down_read is slow?

--Andy
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