Arjan van de Ven wrote:
you just said that you didn't care that it got munlock'd. So you don't
care that it gets freed either. And then reused.
Well, I can live with the app being able to call munlock(), because the apps that our
customers use don't call munlock(). What I can't live with is a bug in the kernel that
causes pinned pages to be swapped or moved.
Obviously, I would rather call get_user_pages() instead of mlock(), but I can't, because
get_user_pages doesn't work. The page doesn't stay pinned at the physical address, but it
does if I call mlock() and get_user_pages().
Actually, in our tests, calling mlock() appears to be good enough, but I'll update our
code to call get_user_pages() as well.
--
Timur Tabi
Staff Software Engineer
[email protected]
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