K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2004-10-10T19:08:00.000000Z
K 7
svn:log
V 1457
MFC multiple pmap changes

amd64 and i386
 - Remove unnecessary checks for curthread == NULL and pmap == NULL.
 - Release the page queues lock earlier in pmap_protect() and pmap_remove()
   in order to reduce contention.
 - Remove an outdated assertion from _pmap_allocpte().
 - Simplify the reference counting of page table pages.  Specifically, use
   the page table page's wired count rather than its hold count to contain
   the reference count.
 - Prevent the unexpected deallocation of a page table page while
   performing pmap_copy().
 - Eliminate the unnecessary masking of the page offset bits from the
   physical address that is stored in the vm_page.
 - Undo revision 1.251.  This change was a performance pessimizing work-
   around that is no longer required.  Now, if the preexisting PTE is
   invalid, pmap_enter() does not call pmap_invalidate_page() to update
   the TLB(s).
 - Make pte_load_store() an atomic operation in all cases, not just i386
   PAE.
 - Restructure pmap_enter() to prevent the loss of a page modified (PG_M)
   bit in a race between processors.  (This restructuring assumes the newly
   atomic pte_load_store() for correct operation.)

amd64 only
 - It is now an error to call pmap_unuse_pt without the paddr of the pde
   that contained the pte.
 - Remove an unused declaration.

i386 only
 - Modify pmap_pte() to support its use on non-current, non-kernel pmaps
   without holding Giant.

Approved by: re (scottl)

END