K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2020-09-09T00:00:43.540283Z
K 7
svn:log
V 615
Allow consumer to customize physical pager.

Add support for user-supplied callbacks into phys pager operations,
providing custom getpages(), haspage(), and populate() methods
implementations.  Pager stores user data ptr/val in the object to
provide context.

Add phys_pager_allocate() helper that takes user ops table as one of
the arguments.

Current code for these methods is moved to the 'default' ops table,
assigned automatically when vm_pager_alloc() is used.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D24652

END