K 10
svn:author
V 3
raj
K 8
svn:date
V 27
2013-08-19T14:56:17.879423Z
K 7
svn:log
V 762
Simplify pv_entry removal or ARMv6/v7:

- PGA_WRITEABLE indicates that there *might be* a writable mapping for the
  particular page, so to avoid frequent sweeping of the pv_entries whenever
  pmap_nuke_pv(), pmap_modify_pv(), etc. is called, it is sufficient to
  clear that flag if there are no managed mappings for that page anymore
  (notice that only pmap_enter is authorized to set this flag).
- Avoid redundant checking for PVF_WIRED flag when this flag cannot be set
  anyway.
- Clear PGA_WRITEABLE only once for each vm_page instead of multiple,
  redundant clearing it in loop when there are no writeable mappings
  to that page anymore.

Submitted by:	Zbigniew Bodek <zbb@semihalf.com>
Reviewed by:	gber
Sponsored by:	The FreeBSD Foundation, Semihalf

END