1:1 Userland threading stage 2.10/4:

1:1 Userland threading stage 2.10/4:

Separate p_stats into p_ru and lwp_ru.

proc.p_ru keeps track of all statistics directly related to a proc.  This
consists of RSS usage and nswap information and aggregate numbers for all
former lwps of this proc.

proc.p_cru is the sum of all stats of reaped children.

lwp.lwp_ru contains the stats directly related to one specific lwp, meaning
packet, scheduler switch or page fault counts, etc.  This information gets
added to lwp.lwp_proc.p_ru when the lwp exits.