K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2012-11-01T16:20:02.860187Z
K 7
svn:log
V 597
In general, we call pmap_remove_all() before calling vm_page_cache().  So,
the call to pmap_remove_all() within vm_page_cache() is usually redundant.
This change eliminates that call to pmap_remove_all() and introduces a
call to pmap_remove_all() before vm_page_cache() in the one place where
it didn't already exist.

When iterating over a paging queue, if the object containing the current
page has a zero reference count, then the page can't have any managed
mappings.  So, a call to pmap_remove_all() is pointless.

Change a panic() call in vm_page_cache() to a KASSERT().

MFC after:	6 weeks

END