K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2010-07-15T16:25:51.154823Z
K 7
svn:log
V 594
Optimize pmap_remove()'s handling of PG_G mappings.  Specifically,
instead of calling pmap_invalidate_page() for each PG_G mapping, call
pmap_invalidate_range() for each range of PG_G mappings.  In addition,
eliminate a redundant call to pmap_invalidate_page().  Both
pmap_remove_pte() and pmap_remove_page() called pmap_invalidate_page()
when the mapping had the PG_G attribute.  Now, only pmap_remove_page()
calls pmap_invalidate_page().  Altogether, these changes eliminate 53%
of the TLB shootdowns for a "buildworld" on a ZFS file system.  On
FFS, the reduction is 3%.

MFC after:	6 weeks

END