K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2016-08-30T05:56:21.309942Z
K 7
svn:log
V 513
Restore swap pager readahead after r292373.

The removal of vm_fault_additional_pages() meant that a hard fault on
a swap-backed page would result in only that page being read in. This
change implements readahead and readbehind for the swap pager in
swap_pager_getpages(). swap_pager_haspage() is modified to return the
largest contiguous non-resident range of pages containing the requested
range.

Reviewed by:	alc, kib
Tested by:	pho
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D7677

END