Re: Users locking memory using futexes

[Jamie Lokier <lk@tantalophile.demon.co.uk>]

Perez-Gonzalez, Inaky wrote:
> This raises a good point - I guess we should be doing something like
> checking user limits (against locked memory, 'ulimit -l').

If futexes are limited by user limits, that's going to mean some
threading program gets a surprise when too many threads decide to
block on a resource.  That's really nasty.  (Of course, a program can
get a surprise due to just running out of memory in sys_futex() too,
but that's much rarer).

It would be nice if the futex waitqueues could be re-hashed against
swap entries when pages are swapped out, somehow, but this sounds hard.

-- Jamie