K 10
svn:author
V 10
nwhitehorn
K 8
svn:date
V 27
2015-02-17T01:45:38.920633Z
K 7
svn:log
V 778
First round of new code. This is a (nearly) ground-up rewrite of the 64-bit
pmap code designed to maximize concurrency. Some pieces are still missing
(PS3 support, in particular) but this is capable of surviving make -j16 on
a POWER8 at least.

Core ingredients:
- Remove all global locks and shared state from normal operation. The two
  page table backends do keep a global lock that is used for evictions,
  but these are extremely rare. Standard operations for two pmaps using
  disjoint memory can proceed completely in parallel.
- Completely remove the second memory hash table used for overflows in favor
  of recoverable state and operations on vm_pages.
- Use one of the software bits in the PTEs as a lock, the way Linux does
  and the architecture manual recommends.

END