thorpej ff62d4c0c5 - Tweak the pmap locking protocol slightly -- require that a pmap must
be locked before it can be marked as `active' on a processor.
- Require that pmaps other than the kernel pmap be locked when they
  are passed to pmap_tlb_shootdown().  This, combined with the locking
  protocol tweak, allow us to get a consistent view of `activeness' of
  a pmap, which means we can optmize away a lot of TLB shootdown traffic
  for user pmaps.
- Borrow an idea from the i386mp branch; use the normal SHOOTDOWN IPI
  to deal with hitting the entire TLB, and garbage-collect the TBIA
  and TBIAP IPIs.
2001-07-15 16:42:18 +00:00
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