K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2017-12-31T04:01:47.050628Z
K 7
svn:log
V 763
Previously, swap_pager_copy() freed swap blocks one at at time, via
swp_pager_meta_ctl(), with no opportunity to recognize freeing of
consecutive blocks and free fewer block ranges.  To open that opportunity,
this change removes the SWM_FREE option from swp_pager_meta_ctl(), and
compels the caller to do the freeing when a valid block address is returned.
In swap_pager_copy(), these frees are aggregated, so that a sequence of them
can be done at one time.

The only other caller to swp_pager_meta_ctl() that passed SWM_FREE,
swp_pager_unswapped(), is also modified to handle its single free
explicitly.

Submitted by:	Doug Moore <dougm@rice.edu>
Reviewed by:	kib (an earlier version)
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D13290

END