[Bikeshed] sigacts locking

[Terry Lambert]

David Schultz wrote:
> It occurs to me that this leaves very little in the uarea.  You
> have a struct pstats, which is less than 256 bytes, and you have
> the kinfo_proc, which shouldn't need to be there anyway.  Perhaps
> now would also be a good time to get rid of uarea swapping and the
> associated complexity altogether.

The swapping of the uarea doesn't really introduce a lot of
extra complexity, since all it does is allocate swappable
pages, just like the swappable pages in user space.

Change that mode stuff out of the uarea are probably a bad
idea, since it increases KVA pressure by moving them to
wired kernel pages.

-- Terry