Re: uarea swap-out

[Mindaugas Rasiukevicius <rmind%netbsd.org@localhost>]

Matt Thomas <matt%3am-software.com@localhost> wrote:
> If we are going to get rid of swappable uareas, then we should go all  
> the way.
> 
> finally kill struct user (which just contains the pcb).  Move the pcb  
> into the lwp as l_md.
> 
> The separate lwp pool should go away and the lwp should just be placed  
> at the bottom of the uarea followed by the pcb.  l_addr should be  
> renamed l_pcb.

Right, these are more invasive. I will make a separate change set.

Also, it was not in the patch, but I think we can remove pmap_collect().

Since we would merge lwp_cache with uarea, I am not sure if we want to
allocate lwp/uarea from lwp_create(). It would be good to improve failure
case in fork1() (currently, handling lwp_create() failure in that path is
complicated), and uvm_uarea_alloc() and uvm_uarea_free() can be useful.

Comments?

-- 
Mindaugas